纳米二氧化锰改性生物炭去除水溶液中二丁基邻苯二甲酸酯和土霉素的机理。
Removal mechanism of di-n-butyl phthalate and oxytetracycline from aqueous solutions by nano-manganese dioxide modified biochar.
机构信息
School of Environmental and Chemical Engineering, Tianjin Polytechnic University, No. 399 Binshui West Road, Xiqing District, Tianjin, 300387, China.
State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, No. 399 Binshui West Road, Xiqing District, Tianjin, 300387, China.
出版信息
Environ Sci Pollut Res Int. 2018 Mar;25(8):7796-7807. doi: 10.1007/s11356-017-1089-5. Epub 2017 Dec 30.
In this work, nano-manganese dioxide (nMnO)-modified biochar (BC) was synthesized in order to improve BC's adsorption capacity for di-n-butyl phthalate (DBP) and oxytetracycline (OTC). The results showed that nMnO on the BC surface exhibited a poor crystallinity and oxidation state (Mn (IV)). Sorption experiments showed that, compared to BC, DBP sorption capacity of nMnO-BC (1:20) and OTC sorption capacity of nMnO-BC (1:10) were 0.0364 and 0.0867 mmol/g, respectively, which are significantly higher than that of BC (0.0141 and 0.0151 mmol/g). Kinetics and isotherm experiments indicated that physical adsorption and chemical interactions have both exerted their impacts on the adsorption process. Further X-ray photoelectron spectroscopy (XPS) analysis showed that part of the Mn (IV) in nMnO-BC was reduced to Mn (III) and Mn (II) after DBP or OTC adsorption. Therefore, we suggest the nMnO also acted as an oxidizer on modified BC, which may accelerate the degradation of DBP and OTC.
在这项工作中，合成了纳米二氧化锰（nMnO）修饰的生物炭（BC），以提高 BC 对邻苯二甲酸二丁酯（DBP）和土霉素（OTC）的吸附能力。结果表明，BC 表面的 nMnO 结晶度和氧化态（Mn（IV））较差。吸附实验表明，与 BC 相比，nMnO-BC（1:20）对 DBP 的吸附容量和 nMnO-BC（1:10）对 OTC 的吸附容量分别为 0.0364 和 0.0867 mmol/g，明显高于 BC（0.0141 和 0.0151 mmol/g）。动力学和等温线实验表明，物理吸附和化学相互作用都对吸附过程产生了影响。进一步的 X 射线光电子能谱（XPS）分析表明，部分 nMnO-BC 中的 Mn（IV）在吸附 DBP 或 OTC 后被还原为 Mn（III）和 Mn（II）。因此，我们建议 nMnO 也可以作为改性 BC 的氧化剂，这可能加速 DBP 和 OTC 的降解。
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