Removal of Orange G by nitrogen-doped biochar loaded with CuS activated persulfate
CHEN Si-liang1, SUN Wen1,2, HONG Yao-liang1,2,3
1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; 2. Jiangsu Collaborative Innovation Center of Water Treatment Technology and Materials, Suzhou 215009, China; 3. Jiangsu Separation and Purification Materials and Technology Engineering Research Center, Suzhou 215009, China
Abstract：In the present study, a composite material of nitrogen-doped biochar loaded with copper sulfide (CuS@NBC) was synthesized using wheat straw and urea via a pyrolysis-coprecipitation method. The physicochemical properties of CuS@NBC were analyzed via X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) surface area and porosity analysis. The prepared CuS@NBC was used for activating peroxydisulfate (PDS) to degrade the azo dye Orange G (OG). This study investigated the effect of various parameters, including PDS concentration, CuS@NBC concentration, and initial pH, on OG removal efficacy, as well as the recycling performance of CuS@NBC. The results showed that at an OG concentration of 50mg/L, a CuS@NBC concentration of 0.2g/L, and a PDS concentration of 4mmol/L resulted in the OG removal and mineralization rates of 99.16% and 36.79%, respectively. Effective OG removal was observed within a pH range of 5~9. CuS@NBC maintained an OG removal rate of 75.92% even after five reuse cycles. Electron paramagnetic resonance spectroscopy and free-radical quenching experiments indicated that O2·- and 1O2 were the primary active oxygen species in the CuS@NBC/PDS system. X-ray photoelectron spectroscopy (XPS) analysis revealed that Cu+, C=O, -COOH, and graphitic nitrogen on the surface of CuS@NBC were the main active sites for PDS activation. Ion coexistence experiments demonstrated that OG removal was enhanced by Cl-, while NO3- had almost no effect on it and HCO3- and Humic acid (HA) considerably inhibited it. In addition, based on experimental results, a potential activation mechanism for the CuS@NBC/PDS system was proposed.
陈思良, 孙雯, 洪耀良. 氮掺杂生物炭负载CuS活化过硫酸盐去除橙黄G[J]. 中国环境科学, 2024, 44(5): 2483-2494.
CHEN Si-liang, SUN Wen, HONG Yao-liang. Removal of Orange G by nitrogen-doped biochar loaded with CuS activated persulfate. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(5): 2483-2494.
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