Application of biochar for the adsorption of organic pollutants from wastewater: Modification strategies, mechanisms and challenges

Hydrothermal synthesis of magnetic sludge biochar for tetracycline and ciprofloxacin adsorptive removal.

Critical review on Adsorptive Removal of Antibiotics: Present Situation, Challenges and Future Perspective

In-situ immobilization of ZIF-67 on wood aerogel for effective removal of tetracycline from water

Abstract The chemical regeneration process has been extensively applied to reactivate biochar, supporting its reusability and leading to significant operating cost reduction. However, no recent review discusses the effectiveness of biochar chemical regeneration. Thus, this article comprehensively reviews the chemical regeneration of biochar contaminated with organic and inorganic pollutants. Performance of the chemical regeneration depends on adsorption mechanism, functional groups, adsorbent pore structure, and changes in active adsorbent sites. Secondary contamination is one of the challenges facing the sustainable adaptation of the chemical regeneration process in the industry. The paper discusses these challenges and draws a roadmap for future research to support sustainable wastewater treatment by biochar. 

https://www.nature.com/articles/s41545-022-00172-3.pdf

A comprehensive review on the chemical regeneration of biochar adsorbent for sustainable wastewater treatment

A novel approach was employed to load α-Fe2O3 and α-FeOOH onto sewage sludge biochar (SBC) with the purpose of efficient nickel (Ni) removal. A high Ni(II) adsorption capacity of 35.50 mg·g-1 in 100 ppm Ni(II) solution with 10 mg modified sewage sludge biochar (MSBC) was achieved. The adsorption kinetic and isotherm were fitted well by the pseudo-second-order model and the Langmuir model, respectively. The optimal pH was found around a neutral pH of 7. The adsorption mechanisms of Ni(II) onto MSBC were described as the synergistic effects of electrostatic attraction, ion exchange, inner-sphere complexation and co-precipitation. The initial rapid adsorption phenomenon could be attributed to electrostatic attraction and ion exchange, and then inner-sphere complexation and co-precipitation acted as a crucial role in the following step. The remarkable performance of MSBC provides an effective waste utilization approach to simultaneous sewage sludge recycle and Ni removal from aqueous solution.

/pdf/highly-efficient-nickel-ii-removal-by-sewage-sludge-biochar-4mn61s2khk.pdf

Highly efficient nickel (II) removal by sewage sludge biochar supported α-Fe2O3 and α-FeOOH: Sorption characteristics and mechanisms

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Hydrothermal synthesis of magnetic sludge biochar for tetracycline and ciprofloxacin adsorptive removal.

Highly efficient nickel (II) removal by sewage sludge biochar supported α-Fe2O3 and α-FeOOH: Sorption characteristics and mechanisms