Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China.
School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China; Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi Province 710055, China.
J Hazard Mater. 2021 Oct 5;419:126343. doi: 10.1016/j.jhazmat.2021.126343. Epub 2021 Jun 8.
Via enlarging the specific surface area of sludge biochar to enhance the close contact of multiple reactants may be a simple route to improve the catalytic performance with reduced dosage of biochar and oxidant, benefitting for cost-effectiveness and eco-friendliness. Herein, PS activation ability of a reported sludge-derived biochar adsorbent was investigated. 80% TOC of 100 mL 10 mg/L BPA was removed within 40 min by 7 mg biochar and 0.5 mM PS mixed, with a relatively high PS activation efficiency close to 50%. Expectedly, the desired mineralization efficiency of complex actual wastewater was also identified. Eco-friendliness of the application mode was confirmed by the leaching toxicity and acute bio-toxicity tests. Physicochemical properties of the sludge biochar were comprehensively characterized by various techniques. Combined with a series of mechanism analysis, ·OH, SO·, ·O, O, free electron all participated in pollutants removal process and the non-radical pathway of electron transfer dominated the reaction. The generated metastable complex [SBC-PS*] confirmed by in situ FT-IR and Raman spectra was the most important active species for electron transfer and PS decomposition. Due to the high efficiency and stability, the sludge biochar adsorbent/PS catalytic system provides a promising way for waste reuse and advanced wastewater treatment.
通过增大污泥生物炭的比表面积来增强多种反应物的紧密接触，可能是一种提高催化性能的简单途径，同时减少生物炭和氧化剂的用量，有利于提高性价比和环境友好性。本文研究了一种报道的污泥衍生生物炭吸附剂的 PS 活化能力。在 7 mg 生物炭和 0.5 mM PS 混合的条件下，100 mL 10 mg/L BPA 中 80%的 TOC 在 40 min 内被去除，PS 活化效率相对较高，接近 50%。预期也确定了复杂实际废水的所需矿化效率。应用模式的生态友好性通过浸出毒性和急性生物毒性测试得到了确认。通过各种技术对污泥生物炭的物理化学性质进行了综合表征。结合一系列的机制分析，·OH、SO·、·O、O 和自由电子都参与了污染物的去除过程，并且电子转移的非自由基途径主导了反应。通过原位 FT-IR 和拉曼光谱证实，生成的亚稳配合物[SBC-PS*]是电子转移和 PS 分解的最重要的活性物质。由于高效和稳定性，污泥生物炭吸附剂/PS 催化体系为废物再利用和高级废水处理提供了一种很有前途的方法。
