Scilight Press

Author Information

Received: 09 Mar 2026 | Revised: 17 Mar 2026 | Accepted: 27 Apr 2026 | Published: 14 May 2026

Abstract

Keywords

biochar adsorption | dye removal | surface engineering | adsorption mechanisms | process optimization | wastewater treatment

References 

• 1.

  Zeghioud, H.; Fryda, L.; Djelal, H.; et al. A Comprehensive Review of Biochar in Removal of Organic Pollutants from Wastewater: Characterization, Toxicity, Activation/Functionalization and Influencing Treatment Factors. J. Water Process Eng. 2022, 47, 102801.

• 2.

  Sutar, S.; Patil, P.; Jadhav, J. Recent Advances in Biochar Technology for Textile Dyes Wastewater Remediation: A Review. Environ. Res. 2022, 209, 112841.

• 3.

  Jagadeesh, N.; Sundaram, B. Adsorption of Pollutants from Wastewater by Biochar: A Review. J. Hazard. Mater. Adv. 2023, 9, 100226.

• 4.

  Chen, H.; Gao, Y.; Li, J.; et al. Engineered Biochar for Environmental Decontamination in Aquatic and Soil Systems: A Review. Carbon Res. 2022, 1, 4.

• 5.

  Satyam, S.; Patra, S. Innovations and Challenges in Adsorption‑Based Wastewater Remediation: A Comprehensive Review. Heliyon 2024, 10, e27584.

• 6.

  Tsauria, Q.D.; Gareso, P.L.; Tahir, D. Systematic Review of Chitosan‑Based Adsorbents for Heavy Metal and Dye Remediation. Integr. Environ. Assess. Manag. 2026, 22, 26–46.

• 7.

  Gkika, D.A.; Kyzas, G.Z. Reusability of Spent Adsorbents for a Circular Materials Economy in the Sustainable Chemical Industry. RSC Sustainability 2026, 4, 1023–1048.

• 8.

  Dang, D.; Mei, L.; Yan, G.; et al. Synthesis of Nanoporous Biochar from Rice Husk for Adsorption of Methylene Blue. J. Chem. 2023, 2023, 6624295.

• 9.

  Dewan, A. Impact of Industrial Effluents on Dhaka Export Processing Zoneʼs Water Bodies: A Comprehensive Analysis. Cogniz. J. Multidiscip. Stud. 2024, 4, 235–248.

• 10.

  Jagadeesh, N.; Sundaram, B. Emerging Pollutants Removal Using Biochar in Wastewater: A Critical Review. In Emerging Technologies in Wastewater Treatment; CRC Press: Boca Raton, FL, USA, 2023; pp. 17–32.

• 11.

  Martiny, T.R.; Avila, L.B.; Rodrigues, T.L.; et al. From Waste to Wealth: Exploring Biocharʼs Role in Environmental Remediation and Resource Optimization. J. Clean. Prod. 2024, 453, 142237.

• 12.

  Al Masud, M.A.; Shin, W.S.; Sarker, A.; et al. A Critical Review of Sustainable Application of Biochar for Green Remediation: Research Uncertainty and Future Directions. Sci. Total Environ. 2023, 904, 166813.

• 13.

  Kurniawan, T.A.; Ali, S.; Mohyuddin, A.; et al. Cultivating Sustainability: Harnessing Biochar‑Derived Composites for Carbon‑Neutral Wastewater Treatment. Process Saf. Environ. Prot. 2024, 187, 665–697.

• 14.

  Díaz, B.; Sommer‑Márquez, A.; Ordoñez, P.E.; et al. Synthesis Methods, Properties, and Modifications of Biochar‑Based Materials for Wastewater Treatment: A Review. Resources 2024, 13, 8.

• 15.

  Mittal, J.; Arora, C.; Mittal, A. Application of Biochar for the Removal of Methylene Blue from Aquatic Environments. In Biomass-Derived Materials for Environmental Applications; Elsevier: Amsterdam, The Netherlands, 2022; pp. 29–76.

• 16.

  Soffian, M.S.; Halim, F.Z.A.; Aziz, F.; et al. Carbon‑Based Material Derived from Biomass Waste for Wastewater Treatment. Environ. Adv. 2022, 9, 100259.

• 17.

  Li, R.; Wu, Y.; Lou, X.; et al. Porous Biochar Materials for Sustainable Water Treatment: Synthesis, Modification, and Application. Water 2023, 15, 395.

• 18.

  Lan, W.; Zhao, X.; Wang, Y.; et al. Research Progress of Biochar Modification Technology and Its Application in Environmental Remediation. Biomass Bioenergy 2024, 184, 107178.

• 19.

  Goswami, L.; Kushwaha, A.; Kafle, S.R.; et al. Surface Modification of Biochar for Dye Removal from Wastewater. Catalysts 2022, 12, 817.

• 20.

  Bazarin, G.; Módenes, A.N.; Espinoza-Quiñones, F.R.; et al. High Removal Performance of Reactive Blue 5G Dye from Industrial Dyeing Wastewater Using Biochar in a Fixed‑Bed Adsorption System: Approaches and Insights Based on Modeling, Isotherms, and Thermodynamics Study. J. Environ. Chem. Eng. 2024, 12, 111761.

• 21.

  Jadhav, S.K.; Thorat, S.R. Adsorption of Azo Dyes Using Biochar Prepared from Regional Crop Waste Material. Biosci. Biotechnol. Res. Asia 2022, 19, 141–151.

• 22.

  Ahmaruzzaman, M.; Roy, S.; Singha, A.; et al. Emerging Nanotechnologies in Adsorption of Dyes: A Comprehensive Review of Carbon and Metal Oxide‑Based Nanomaterials. Adsorption 2025, 31, 34.

• 23.

  George, G.; Ealias, A.M.; Saravanakumar, M.P. Advancements in Textile Dye Removal: A Critical Review of Layered Double Hydroxides and Clay Minerals as Efficient Adsorbents. Environ. Sci. Pollut. Res. 2024, 31, 12748–12779.

• 24.

  Tharayil, J.M.; Chinnaiyan, P. Sustainable Waste Valorisation: Novel Areca catechu L. Husk Biochar for Anthraquinone Dye Adsorption—Characterization, Modelling, Kinetics, and Isotherm Studies. Results Eng. 2023, 20, 101624.

• 25.

  Thinakaran, E.; Brema, J.; Arumairaj, P.D. Feasibility of Spent Macroalgae Biochar for Removal of Acid Red 88 (AR) Dye from Its Aqueous Solution. Global NEST J. 2022, 24, 392–400.

• 26.

  Jellali, S.; Azzaz, A.A.; Al-Harrasi, M.; et al. Conversion of Industrial Sludge into Activated Biochar for Effective Cationic Dye Removal: Characterization and Adsorption Properties Assessment. Water 2022, 14, 2206.

• 27.

  Li, H.; Kong, J.; Zhang, H.; et al. Mechanisms and Adsorption Capacities of Ball Milled Biomass Fly Ash/Biochar Composites for the Adsorption of Methylene Blue Dye from Aqueous Solution. J. Water Process Eng. 2023, 53, 103713.

• 28.

  Wang, J.; Tan, Y.; Yang, H.; et al. On the Adsorption Characteristics and Mechanism of Methylene Blue by Ball Mill Modified Biochar. Sci. Rep. 2023, 13, 21174.

• 29.

  Jose, S.; Roy, R.; Phukan, A.R.; et al. Biochar from Oil Cakes: An Efficient and Economical Adsorbent for the Removal of Acid Dyes from Wool Dye House Effluent. Clean Technol. Environ. Policy 2022, 24, 1599–1608.

• 30.

  Rápó, E.; Tonk, S. Factors Affecting Synthetic Dye Adsorption; Desorption Studies: A Review of Results from the Last Five Years (2017–2021). Molecules 2021, 26, 5419.

• 31.

  Singh, K.; Arora, S. Removal of Synthetic Textile Dyes from Wastewaters: A Critical Review on Present Treatment Technologies. Crit. Rev. Environ. Sci. Technol. 2011, 41, 807–878.

• 32.

  Kolya, H.; Kang, C.-W. Toxicity of Metal Oxides, Dyes, and Dissolved Organic Matter in Water: Implications for the Environment and Human Health. Toxics 2024, 12, 111.

• 33.

  Haleem, A.; Shafiq, A.; Chen, S.-Q.; et al. A Comprehensive Review on Adsorption, Photocatalytic and Chemical Degradation of Dyes and Nitro‑Compounds over Different Kinds of Porous and Composite Materials. Molecules 2023, 28, 1081.

• 34.

  Zafar, S.; Bukhari, D.A.; Rehman, A. Azo Dyes Degradation by Microorganisms—An Efficient and Sustainable Approach. Saudi J. Biol. Sci. 2022, 29, 103437.

• 35.

  Kumar, A.; Chang, D.W. Active Polymers Decorated with Major Acid Groups for Water Treatment: Potentials and Challenges. Polymers 2024, 17, 29.

• 36.

  Li, N.; Hou, J.; Ou, R.; et al. Stimuli-Responsive Ion Adsorbents for Sustainable Separation Applications. ACS Nano 2023, 17, 17699–17720.

• 37.

  Salehi, M. Surface Complexation at Charged Organic Surfaces. Rev. Mineral. Geochem. 2025, 91, 149–173.

• 38.

  Akter, T.; Protity, A.T.; Shaha, M.; et al. The Impact of Textile Dyes on the Environment. In Nanohybrid Materials for Treatment of Textiles Dyes; Springer: Berlin/Heidelberg, Germany, 2023; pp. 401–431.

• 39.

  Saxena, A.; Gupta, S. Toxicological Impact of Azo Dyes and Their Microbial Degraded Byproducts on Flora and Fauna. In Innovations in Environmental Biotechnology; Springer: Berlin/Heidelberg, Germany, 2022; pp. 319–343.

• 40.

  Samykannu, M. Eco-Friendly Approaches to Azo Dye Removal: The Role of Microbial Azo-Reductases. Appl. Biochem. Biotechnol. 2025, 197, 6358–6376.

• 41.

  Saini, R.; Choudhary, K. Toxic Potential of Azo Dyes: A Broader Understanding. In Hazardous Chemicals; Elsevier: Amsterdam, The Netherlands, 2025; pp. 469–481.

• 42.

  Ngo, A.C.R.; Tischler, D. Microbial Degradation of Azo Dyes: Approaches and Prospects for a Hazard‑Free Conversion by Microorganisms. Int. J. Environ. Res. Public Health 2022, 19, 4740.

• 43.

  Sriram, G.; Dhanabalan, K.; Vishwanath, R.S.; et al. Progress in Porous Carbon‑Based Adsorbents for the Removal of Dyes from Single and Binary Systems and Their Adsorption Mechanism—A Review. Inorg. Chem. Front. 2025, 19, 5563–5628.

• 44.

  Danesh, P.; Prussi, M.; Salimbeni, A.; et al. Review on Biochar Upgrading Methods for Its Application in Thermochemical Conversion Processes and Critical Materials Recovery. Sustainability 2025, 17, 10194.

• 45.

  Yi, B.; Guo, F.; Wei, Q.; et al. Functionalized Biochar: Mechanisms of Oxygen‑Containing Functional Groups in Water Pollutant Remediation. ACS EST Water 2025, 5, 5764–5784.

• 46.

  Ji, W.; Jin, H.; Wang, H.; et al. Elucidating the Dominant Role of π-π Interactions in Methylene Blue Removal via Porous Biochar: A Synergistic Approach of Experimental and Theoretical Mechanistic Insights. Colloids Surf. A Physicochem. Eng. Asp. 2025, 715, 136615.

• 47.

  Xie, J.; Lin, R.; Liang, Z.; et al. Effect of Cations on the Enhanced Adsorption of Cationic Dye in Fe₃O₄‑Loaded Biochar and Mechanism. J. Environ. Chem. Eng. 2021, 9, 105744.

• 48.

  Wei, F.; Zhu, Y.; He, T.; et al. Insights into the pH‑Dependent Adsorption Behavior of Ionic Dyes on Phosphoric Acid‑Activated Biochar. ACS Omega 2022, 7, 46288–46302.

• 49.

  Lv, D.-C.; Chen, M.-R.; Song, M.-R.; et al. Beyond Electrostatic Interaction: Ball Milling-Induced Dominance of Pore Filling and π‑π Stacking for Methylene Blue Adsorption on Tobacco Stem Derived Activated Carbon. J. Water Process Eng. 2026, 81, 109435.

• 50.

  Kurniawan, T.A.; Othman, M.H.D.; Liang, X.; et al. Challenges and Opportunities for Biochar to Promote Circular Economy and Carbon Neutrality. J. Environ. Manag. 2023, 332, 117429.

• 51.

  Luo, X.; Zhang, M.; Zhao, J. Advancements in Design and Synthesis of Porous Materials for Selective Organic Dye Adsorption and Separation. CrystEngComm 2025, 27, 5250–5264.

• 52.

  Khodayari, P.; Aziziyan, R.; Ebrahimzadeh, H.; et al. Reusable Nanofibrous Adsorbent Functionalized with MIL-101(Fe)/Graphene Oxide for Azo Dye Remediation from Textile Effluents: Functionalization, Kinetics, and Mechanism Insights. Sci. Rep. 2025, 15, 35346.

• 53.

  Sutradhar, S.; Mondal, A.; Kuehne, F.; et al. Comparison of Oil-Seed Shell Biomass‑Based Biochar for the Removal of Anionic Dyes—Characterization and Adsorption Efficiency Studies. Plants 2024, 13, 820.

• 54.

  Guy, M.; Mathieu, M.; Anastopoulos, I.P.; et al. Process Parameters Optimization, Characterization, and Application of KOH-Activated Norway Spruce Bark Graphitic Biochars for Efficient Azo Dye Adsorption. Molecules 2022, 27, 456.

• 55.

  Luo, X.; Liu, C.; Wang, J.; et al. The Improvement in Methane Production, Nutrient Removal, and Heavy Metal Passivation during Anaerobic Digestion of Chicken Manure: The Role of Modified Porous Materials. Biomass Convers. Biorefin. 2025, 15, 15019–15033.

• 56.

  Awogbemi, O.; Von Kallon, D.V. Progress in Agricultural Waste Derived Biochar as Adsorbents for Wastewater Treatment. Appl. Surf. Sci. Adv. 2023, 18, 100518.

• 57.

  Law, X.N.; Cheah, W.Y.; Chew, K.W.; et al. Microalgal-Based Biochar in Wastewater Remediation: Its Synthesis, Characterization and Applications. Environ. Res. 2022, 204, 111966.

• 58.

  Suratman, A.; Astuti, D.N.; Kusumastuti, P.P.; et al. Okara Biochar Immobilized Calcium-Alginate Beads as Eosin Yellow Dye Adsorbent. Results Chem. 2024, 7, 101268.

• 59.

  Wang, H.; Liu, S.; Wang, H.; et al. Thermochemical Conversion of Biomass to Fuels and Chemicals: A Review of Catalysts, Catalyst Stability, and Reaction Mechanisms. Catal. Rev. 2025, 67, 57–129.

• 60.

  El-Fawal, E.M.; El Naggar, A.M.A.; El-Zahhar, A.A.; et al. Biofuel Production from Waste Residuals: Comprehensive Insights into Biomass Conversion Technologies and Engineered Biochar Applications. RSC Adv. 2025, 15, 11942–11974.

• 61.

  Williams, C.L.; Westover, T.L.; Emerson, R.M.; et al. Sources of Biomass Feedstock Variability and the Potential Impact on Biofuels Production. Bioenergy Res. 2016, 9, 1–14.

• 62.

  Ippolito, J.A.; Cui, L.; Kammann, C.; et al. Feedstock Choice, Pyrolysis Temperature and Type Influence Biochar Characteristics: A Comprehensive Meta-Data Analysis Review. Biochar 2020, 2, 421–438.

• 63.

  Isaeva, V.I.; Vedenyapina, M.D.; Kurmysheva, A.Y.; et al. Modern Carbon‑Based Materials for Adsorptive Removal of Organic and Inorganic Pollutants from Water and Wastewater. Molecules 2021, 26, 6628.

• 64.

  Wang, D.; Li, H.; Zuo, J.; et al. Recent Advances on Porous Biochar: From Production to Remediation of Organic Pollutants from Water and Future Perspectives. ChemistrySelect 2025, 10, e202404918.

• 65.

  Fernández, L.A.G.; Castillo, N.A.M.; Polo, M.S.; et al. Algal-Based Carbonaceous Materials for Environmental Remediation: Advances in Wastewater Treatment, Carbon Sequestration, and Biofuel Applications. Processes 2025, 13, 556.

• 66.

  Periyasamy, A.P. Recent Advances in the Remediation of Textile-Dye-Containing Wastewater: Prioritizing Human Health and Sustainable Wastewater Treatment. Sustainability 2024, 16, 495.

• 67.

  Wang, H.; Shao, Y.; Mei, S.; et al. Polymer-Derived Heteroatom‑Doped Porous Carbon Materials. Chem. Rev. 2020, 120, 9363–9419.

• 68.

  Liu, L.; Jiang, X.; Lu, T.; et al. Agricultural Waste for Remediation of Neonicotinoid Pollution: Mechanisms and Environmental Effects of Multi-Site Adsorption of Dinotefuran on Rice Husk Biochar. Agronomy 2025, 15, 2746.

• 69.

  Danmallam, U.N.; Adeleke, A.A.; Zango, Z.U.; et al. Adsorptive Removal of Phenanthrene and Naphthalene from Wastewater Using Coal Derived Carbon Nanoparticles with Kinetic and Thermodynamic Evaluation. Sci. Rep. 2025, 15, 39118.

• 70.

  Mu, Z.; Xie, P.; A. Alshammari, D.; et al. From Structure to Function: Innovative Applications of Biomass Carbon Materials in Microwave Absorption. Adv. Compos. Hybrid Mater. 2024, 7, 220.

• 71.

  Ncube, S.; Tian, Z.; Lin, J.; et al. Sustainable Biomass‑Derived Single‑Atom Catalysts for Fenton‑Like Catalysis. Small 2025, 21, 2504746.

• 72.

  Show, P.L.; Pal, P.; Leong, H.Y.; et al. A Review on the Advanced Leachate Treatment Technologies and Their Performance Comparison: An Opportunity to Keep the Environment Safe. Environ. Monit. Assess. 2019, 191, 227.

• 73.

  Wang, B.; Ma, Y.; Cao, P.; et al. Ball Milling and Magnetic Modification Boosted Methylene Blue Removal by Biochar Obtained from Water Hyacinth: Efficiency, Mechanism, and Application. Molecules 2024, 29, 5141.

• 74.

  Sharma, N.; Nurni, V.N.; Tathavadkar, V.; et al. A Review on the Generation of Solid Wastes and Their Utilization in Indian Steel Industries. Miner. Process. Extr. Metall. 2017, 126, 54–61.

• 75.

  Kurniawan, T.A.; Chan, G.Y.S.; Lo, W.H.; et al. Physico-Chemical Treatment Techniques for Wastewater Laden with Heavy Metals. Chem. Eng. J. 2006, 118, 83–98. https://doi.org/10.1016/j.cej.2006.01.015.

• 76.

  Luan, J.; Wang, Q.; Shao, D.; et al. Research Progress on Influencing Factors and Control Methods of Slagging in Biomass Combustion. Front. Energy Res. 2025, 13, 1634354.

• 77.

  Huo, M.; Huang, C.; Guo, A.; et al. From Waste to Functional Materials: Advances in Porous Material Synthesis and Applications Derived from Coal Gasification Slag. RSC Adv. 2025, 15, 18893–18909.

• 78.

  Dhila, H.; Bhapkar, A.; Bhame, S. Metal Ferrite/Biochar Nanocomposites for Dye Pollutant Removal: Insights into Adsorption and Photocatalytic Strategies. ChemistrySelect 2025, 10, e04007.

• 79.

  Mukherjee, A.; Goswami, N.; Dhak, D. Photocatalytic Remediation of Industrial Dye Waste Streams Using Biochar and Metal‑Biochar Hybrids: A Critical Review. Chem. Afr. 2023, 6, 609–628.

• 80.

  Liu, W.-J.; Jiang, H.; Yu, H.-Q. Development of Biochar‑Based Functional Materials: Toward a Sustainable Platform Carbon Material. Chem. Rev. 2015, 115, 12251–12285.

• 81.

  Wang, A.; Ma, Y.; Zhao, D. Pore Engineering of Porous Materials: Effects and Applications. ACS Nano 2024, 18, 22829–22854.

• 82.

  Laishram, D.; Kim, S.; Lee, S.; et al. Advancements in Biochar as a Sustainable Adsorbent for Water Pollution Mitigation. Adv. Sci. 2025, 12, 2410383.

• 83.

  Onyango, C.; Nyairo, W.; Tchieta, G.P.; et al. Watermelon Rind Based Adsorbents for the Removal of Water Pollutants: A Critical Review. Front. Environ. Chem. 2025, 6, 1568695.

• 84.

  Kurniawan, A.; Ismadji, S.; Zhou, C.H. Structural and Functional Modifications of Biochar for Removal of Chemical Pollutants in Wastewater Treatment. In Catalytic Applications of Biochar for Environmental Remediation: A Green Approach Towards Environment Restoration (Vol. 1); ACS Publications: Washington, DC, USA, 2024; pp. 71–107.

• 85.

  Liu, C.; Wang, W.; Wu, R.; et al. Preparation of Acid- and Alkali-Modified Biochar for Removal of Methylene Blue Pigment. ACS Omega 2020, 5, 30906–30922.

• 86.

  Zhang, Z.; Zhang, M.; Zhao, X.; et al. High-Efficient Removal and Adsorption Mechanism of Organic Dyes in Wastewater by KOH-Activated Biochar from Phenol-Formaldehyde Resin Modified Wood. Sep. Purif. Technol. 2024, 330, 125542.

• 87.

  Shi, Y.; Yin, M.; Liu, D.; et al. Single-Step Synthesis of Nitrogen and Phosphorus Co-Doped Biochar and Its Application in Dye Removal: Synergistic Effects of Adsorption and Peroxymonosulfate Activation. Environ. Res. 2025, 265, 121866.

• 88.

  Chandrasekar, R.; Prakash, P.; Ghosh, D.; et al. Heteroatom Doped Biochar-Aluminosilicate Composite as a Green Alternative for the Removal of Hazardous Dyes: Functional Characterization and Modeling Studies. Environ. Res. 2024, 260, 119579.

• 89.

  Aslam, A.; Batool, F.; Noreen, S.; et al. Metal Oxide-Impregnated Biochar for Azo Dye Remediation as Revealed through Kinetics, Thermodynamics, and Response Surface Methodology. ACS Omega 2024, 9, 4300–4316.

• 90.

  Gong, J.; Jiang, H.; Li, X.; et al. Highly Efficient Activation of Periodate by a Manganese‑Modified Biochar to Rapidly Degrade Methylene Blue. Environ. Res. 2024, 241, 117657.

• 91.

  Shao, Z.; Zhao, Y.; Wang, S.; et al. Effects and Mechanisms of Fe/N Co-Doped Magnetic Biochar for Efficient Removal of Single and Multiple Dye. Colloids Surf. A Physicochem. Eng. Asp. 2025, 704, 135505.

• 92.

  Li, X.; Xu, J.; Luo, X.; et al. Efficient Adsorption of Dyes from Aqueous Solution Using a Novel Functionalized Magnetic Biochar: Synthesis, Kinetics, Isotherms, Adsorption Mechanism, and Reusability. Bioresour. Technol. 2022, 360, 127526.

• 93.

  Viswanathan, S.P.; Kuriakose, G.M.; Neelamury, S.P.; et al. Biochar-Based Composites as Environmentally Sustainable Functional Materials for Wastewater Treatment. In Comprehensive Materials Processing; Elsevier: Amsterdam, The Netherlands, 2024; pp. 303–318.

• 94.

  Ajiboye, T.O.; Mafolasire, A.A.; Olasupo, A.; et al. Heteroatom‑Doped Carbon Allotropes in the Removal of Organic Pollutants from Water. In Heteroatom-Doped Carbon Allotropes: Progress in Synthesis, Characterization, and Applications; ACS Publications: Washington, DC, USA, 2024; pp. 255–281.

• 95.

  Ding, W.; Zhou, G.; Wen, S.; et al. Two-Dimensional Activated Carbon Nanosheets for Rapid Removal of Tetracycline via Strong π-π Electron Donor-Receptor Interactions. Bioresour. Technol. 2022, 360, 127544.

• 96.

  Umar, M.; Nnadiekwe, C.C.; Abdulazeez, I.; et al. Nitrogen-Enhanced Charge Transfer Efficacy on the Carbon Sheet: A Theoretical Insight into the Adsorption of Anionic Dyes. Arab. J. Sci. Eng. 2022, 47, 419–427.

• 97.

  Joia, R.; Atamanov, M.; Umbetkaliev, K.; et al. Exploring the Versatile Production Techniques and Applications of Nitrogen‑Doped Activated Carbon. Therm. Sci. Eng. 2024, 7, 5842.

• 98.

  Mao, Y.; Cai, B.; Huang, M.; et al. A Sustainable Preparation Strategy for the Nitrogen‑Doped Hierarchical Biochar with High Surface Area for the Enhanced Removal of Organic Dye. Biochar 2023, 5, 70.

• 99.

  Chen, S.; Zhang, J.; Zhang, C.; et al. Equilibrium and Kinetic Studies of Methyl Orange and Methyl Violet Adsorption on Activated Carbon Derived from Phragmites australis. Desalination 2010, 252, 149–156. https://doi.org/10.1016/j.desal.2009.10.010.

• 100.

  Zhao, J.; Jiang, Y.; Chen, X.; et al. Unlocking the Potential of Element-Doped Biochar: From Tailored Synthesis to Multifunctional Applications in Environment and Energy. Biochar 2025, 7, 77.

• 101.

  Akpomie, K.G.; Conradie, J. Sequestration of Thiazolyl Blue Tetrazolium Bromide and Bromophenol Blue onto Biochar Derived from American Sycamore Leaves. Int. J. Environ. Anal. Chem. 2024, 104, 1026–1043.

• 102.

  Tharayil, J.M.; Chinnaiyan, P. Optimization of Malachite Green Adsorption Using Palmyra Palm Fibre‑Derived Biochar: A Central Composite Design Approach. Mater. Today Proc. 2024. https://doi.org/10.1016/j.matpr.2024.05.151.

• 103.

  Khan, A.A.; Naqvi, S.R.; Ali, I.; et al. Algal Biochar: A Natural Solution for the Removal of Congo Red Dye from Textile Wastewater. J. Taiwan Inst. Chem. Eng. 2025, 166, 105312.

• 104.

  Pochampally, S.V.; Blanco, J.G.; Ayalew, K.; et al. Novel Alkali Intercalated and Acid‑Exfoliated Biochars with Enhanced Surface Areas for Contaminant Adsorption Applications. Sep. Purif. Technol. 2024, 350, 127793.

• 105.

  Su, X.; Wang, X.; Ge, Z.; et al. KOH-Activated Biochar and Chitosan Composites for Efficient Adsorption of Industrial Dye Pollutants. Chem. Eng. J. 2024, 486, 150387.

• 106.

  Tomin, O.; Vahala, R.; Yazdani, M.R. Synthesis and Efficiency Comparison of Reed Straw-Based Biochar as a Mesoporous Adsorbent for Ionic Dyes Removal. Heliyon 2024, 10, e27929.

• 107.

  Yu, H.; Zhang, Y.; Wang, L.; et al. Experimental and DFT Insights into the Adsorption Mechanism of Methylene Blue by Alkali‑Modified Corn Straw Biochar. RSC Adv. 2024, 14, 1854–1865.

• 108.

  Priyanka; Vashisht, D.; Ibhadon, A.O.; et al. Enhanced Wastewater Remediation Using Mesoporous Activated Wheat Straw Biochars: A Dye Removal Perspective. ACS Sustain. Resour. Manag. 2024, 1, 355–367.

• 109.

  Li, K.; Wu, J.; Li, X.; et al. Preparation of Porous Composite Hydrogel with Ultra-High Dye Adsorption Capacity Based on Biochar: Adsorption Behaviors and Mechanisms. Chem. Eng. Sci. 2024, 295, 120115.

• 110.

  Saadi, A.S.; Bousba, S.; Riah, A.; et al. Efficient Synthesis of Magnetic Activated Carbon from Oak Pericarp for Enhanced Dye Adsorption: A One-Step Approach. Desalin. Water Treat. 2024, 319, 100420.

• 111.

  Zhu, S.; Xu, J.; Xie, J.; et al. Ultrafast Dyeing Wastewater Purification by High-Performance and Reusable Lignin‑Derived Activated Porous Carbon Filter. Sep. Purif. Technol. 2024, 349, 127672.

• 112.

  Rajesh, Y.; Gautam, N.; Shah, J.; et al. Evaluation of Activated Biochar from Sustainable Sterculia foetida Shells for the Removal of AB 158 Dye. J. Environ. Nanotechnol. 2024, 13, 248–255.

• 113.

  Maiti, P.; Mangsatabam, M.; Chatterjee, A.; et al. In-Situ Synthesis of Efficient ZnCl₂ Doped Pyrolyzed Biochar for Adsorptive Remediation of Organic Dyes: Performance Evaluation, Mass Transfer and Mechanism. Sep. Purif. Technol. 2024, 329, 125096.

• 114.

  Carneiro, M.T.; Morais, A.Í. S.; de Carvalho Melo, A.L.F.; et al. Biochar Derived from Water Hyacinth Biomass Chemically Activated for Dye Removal in Aqueous Solution. Sustainability 2023, 15, 14578.

• 115.

  Sun, C.; Luo, Z.; Yu, P.; et al. Comparative Study on the Performance and Mechanism of Adsorption-Oriented Phosphorus-Modified High-Efficiency and Durable Activated Biochar from Fast Pyrolysis. Energies 2023, 16, 5363.

• 116.

  Kapoor, R.T.; Rafatullah, M.; Tajarudin, H.A.; et al. Treatment of Direct Red 28 Dye through Phoenix dactylifera L. Fruit Seed Biochar: Equilibrium, Kinetics, Thermodynamics, and Phytotoxicity Studies. Sustainability 2023, 15, 15266.

• 117.

  Joshi, V.; Santani, D. Physicochemical Characterization and Heavy Metal Concentration in Effluent of Textile Industry. Univers. J. Environ. Res. Technol. 2012, 2, 93–96.

• 118.

  Bayram, O.; Özkan, U.; Şahin, H.T.; et al. Malachite Green (Cationic Dye) Removal with Modified Pinus brutia Biochar. Int. J. Phytoremediation 2024, 26, 416–426.

• 119.

  Kosale, D.; Thakur, C.; Singh, V.K. Use of Jamun Seed (Syzygium cumini) Biochar for the Removal of Fuchsin Dye from Aqueous Solution. J. Serb. Chem. Soc. 2023, 88, 653–667.

• 120.

  Ravindiran, G.; Jeyaraju, R.M.; Nandipati, G.; et al. Prevention of Groundwater Contamination from the Pollutants Released from Dyeing Industries Using Biochar Produced from Palm Shell. Urban Clim. 2023, 49, 101515.

• 121.

  Joshi, M.; Srivastava, A.; Bhatt, D.; et al. Simple Adsorptive Removal of Crystal Violet, a Triarylmethane Dye, from Synthetic Wastewater Using Fe(III)‑Treated Pine Needle Biochar. Environ. Monit. Assess. 2023, 195, 444.

• 122.

  Borpujari, P.; Khan, S.; Dutta, J.; et al. Biochar-Metal Nanocomposites for Azo Dye Removal: Advancements, Mechanisms, and Future Prospects. Discov. Appl. Sci. 2025, 7, 1023.

• 123.

  Mosaffa, E.; Banerjee, A.; Ghafuri, H. Sustainable High-Efficiency Removal of Cationic and Anionic Dyes Using New Super Adsorbent Biochar: Performance, Isotherm, Kinetic and Thermodynamic Evaluation. Environ. Sci. Processes Impacts 2023, 9, 2643–2663.

• 124.

  Xue, J.; Ji, M.; Lu, Y.; et al. The Impact of Chemical Properties of the Solid–Liquid–Adsorbate Interfaces on the Entropy–Enthalpy Compensation Involved in Adsorption. Phys. Chem. Chem. Phys. 2024, 26, 8704–8715.

• 125.

  Kapoor, R.T.; Rafatullah, M.; Aljuwayid, A.M.; et al. Removal of Patent Blue Dye Using Ananas comosus‑Derived Biochar: Equilibrium, Kinetics, and Phytotoxicity Studies. Separations 2022, 9, 426.

• 126.

  Perveen, S.; Nadeem, R.; Nosheen, F.; et al. Biochar‑Mediated Zirconium Ferrite Nanocomposites for Tartrazine Dye Removal from Textile Wastewater. Nanomaterials 2022, 12, 2828.

• 127.

  Tumanyisibwe, A.; Nasr, M.; Fujii, M.; et al. Anaerobic Digestion of Dye Wastewater and Agricultural Waste with Bio-Energy and Biochar Recovery: A Techno-Economic and Sustainable Approach. Water 2024, 16, 2025.

• 128.

  Chavan, R.; Patil, R.; Chougale, A. Efficient Dye Removal Strategies: Exploring the Role of Biochar. ChemSci Adv. 2024, 1, 4–13.

• 129.

  Hama Aziz, K.H.; Fatah, N.M.; Muhammad, K.T. Advancements in Application of Modified Biochar as a Green and Low‑Cost Adsorbent for Wastewater Remediation from Organic Dyes. R. Soc. Open Sci. 2024, 11, 232033.

• 130.

  Olugbenga, O.S.; Adeleye, P.G.; Oladipupo, S.B.; et al. Biomass-Derived Biochar in Wastewater Treatment—A Circular Economy Approach. Waste Manag. Bull. 2024, 1, 1–14.

• 131.

  Cho, S.-H.; Jung, S.; Park, J.; et al. Strategic Use of Crop Residue Biochars for Removal of Hazardous Compounds in Wastewater. Bioresour. Technol. 2023, 387, 129658.

• 132.

  Mohit, A.; Remya, N.; Priyadarshini, U. Multifaceted Application of Modified Biochar for Water and Wastewater Treatment. Environ. Qual. Manag. 2024, 33, 945–953.

• 133.

  Chavan, D.; Mayilswamy, N.; Chame, S.; et al. Biochar Adsorption: A Green Approach to PFAS Contaminant Removal. CleanMat 2024, 1, 52–77.

• 134.

  Lu, J.; Zhang, Q.; An, Q.; et al. Preparation of Activated Carbon from Sewage Sludge Using Green Activator and Its Performance on Dye Wastewater Treatment. Environ. Technol. 2023, 44, 3897–3910.