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Updated: Jan 7, 2026
Physical, Chemical and Biological Characterization of Six Biochars Produced for the Remediation of Contaminated Sites
Published on: November 28, 2014
Recycled biochar-based powdery reagent for degradation of organic chromium complex dye: preparation, evaluation and
Yuanfeng Qi1, Qi Gao1, Feng Han2
1School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, PR China; JMFiltec Co., Ltd., Jiangshan 324100, PR China.
Abstract:
A Recycled Biochar-based Powdery Reagent (RPR) was synthesized from hematite tailings and biochar via one-pot carbothermal reduction method. The preparation and operating conditions of RPR were systematically investigated. Acid Complex Blue GGN (ACBGGN), a Cr (III)-complex organic dye, served as the target pollutant. RPR was characterized and evaluated for ACBGGN degradation using SEM, XRD, XPS, F-AAS, TOC, UV-Vis, and 3D-EEM. The results indicated that 1:1.5 of hematite to biochar, 900 ℃ of calcination temperature, and 1 h of calcination time were beneficial for synthesis of RPR. Under optimal conditions (operating pH = 3, RPR dosage = 1.5 g/300 mL), the removals of ACBGGN, TOC, CODCr, and total chromium were 99.8 %, 96.1 %, 89.3 %, and 81.8 %, respectively. ACBGGN underwent decomposition, yielding low-molecular-weight products. The Cr-species was immobilized on the used RPR surface by co-precipitation. RPR provides a sustainable and cost-effective strategy for remediating organic-heavy-metal complexes.
