Preparation of biochar and biochar composites and their application in a Fenton-like process for wastewater decontamination: A review.

Potential role of biochar in advanced oxidation processes: A sustainable approach

Herein, a novel hexapod-like pyrite nanosheets mineral cluster was prepared via a facile hydrothermal method. Compared with classical homogeneous Fenton processes, this catalyst possessed a higher adsorption capacity and catalytic activity to ciprofloxacin (20 mg/L), which could be completely degraded within 10 min at pH 4.0. •OH was the main reactive oxygen species responsible for ciprofloxacin degradation. Br− (≥ 1 mM), I− (≥ 1 mM), and high concentration of F− ions (≥ 10 mM) exhibited an inhibition effect on ciprofloxacin degradation, but the Cl− ions (0–100 mM) did not show obvious effects on ciprofloxacin removal. Thirteen intermediates were qualitatively identified, and degradation mechanism was tentatively proposed for ciprofloxacin. Several toxic intermediates were produced, but they could be fully mineralized and detoxified by this heterogeneous Fenton catalyst after 30 min reaction. The work provides a novel heterogeneous Fenton catalyst to purify and detoxify antibiotics as well as other refractory organic pollutants contaminated wastewater.

Highly efficient adsorption and catalytic degradation of ciprofloxacin by a novel heterogeneous Fenton catalyst of hexapod-like pyrite nanosheets mineral clusters

Herein, a novel hexapod-like pyrite nanosheets mineral cluster was prepared via a facile hydrothermal method. Compared with classical homogeneous Fenton processes, this catalyst possessed a higher adsorption capacity and catalytic activity to ciprofloxacin (20 mg/L), which could be completely degraded within 10 min at pH 4.0. • OH was the main reactive oxygen species responsible for ciprofloxacin degradation. Br − (≥ 1 mM), I − (≥ 1 mM), and high concentration of F − ions (≥ 10 mM) exhibited an inhibition effect on ciprofloxacin degradation, but the Cl − ions (0–100 mM) did not show obvious effects on ciprofloxacin removal. Thirteen intermediates were qualitatively identified, and degradation mechanism was tentatively proposed for ciprofloxacin. Several toxic intermediates were produced, but they could be fully mineralized and detoxified by this heterogeneous Fenton catalyst after 30 min reaction. The work provides a novel heterogeneous Fenton catalyst to purify and detoxify antibiotics as well as other refractory organic pollutants contaminated wastewater. • A novel catalyst hexapod-like pyrite nanosheets mineral cluster was synthesized. • Ciprofloxacin was removed through adsorption and Fenton catalytic degradation. • • OH was the dominant reactive oxygen species for ciprofloxacin degradation. • Thirteen intermediates were qualitatively determined and identified. • This heterogeneous Fenton catalyst is feasible in degrading antibiotics pollution. 

Electron transfer enhancing Fe(II)/Fe(III) cycle by sulfur and biochar in magnetic FeS@biochar to active peroxymonosulfate for 2,4-dichlorophenoxyacetic acid degradation

Dongqing Feng

Papers

Accelerating effects of biochar for pyrite-catalyzed Fenton-like oxidation of herbicide 2,4-D