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Design and Synthesis of a Biochar-Supported Nano Manganese Dioxide Composite for Antibiotics Removal From Aqueous Solution
Frontiers in Environmental Science ( IF 4.6 ) Pub Date : 2020-05-22 , DOI: 10.3389/fenvs.2020.00062
Jiang Li , Xiaoxi Cai , Yunguo Liu , Yanling Gu , Hui Wang , Shaobo Liu , Simian Liu , Yicheng Yin , Sijia Liu

Manganese dioxide nanoparticles were loaded onto biochar prepared from rice husk to obtain a biochar-supported manganese dioxide composite (BC/MnO2). The properties of this composite were studied through various advanced characterization techniques, combined with experiments on treating aqueous solutions of tetracycline hydrochloride (TC) and doxycycline (DC). The results showed that compared with the original biochar, MnO2 nanoparticles appeared on the surface of BC/MnO2, the carbon content decreased, and the oxygen content increased. Moreover, BC/MnO2 exhibited significantly larger total pore volume and specific surface area, and the pore structure of the biochar was improved. The effect of pH on the adsorption of TC and DC by BC/MnO2 was insignificant. With an increase in the adsorbent dose, the removal rates of TC and DC increased, and the removal ability of BC/MnO2 for TC was slightly higher than that for DC. The adsorption of TC and DC on the BC/MnO2 surface conformed to the Freundlich model. Compared with the pseudo-first-order kinetic model, the pseudo-second-order kinetic model (R2 = 0.999) better fitted the adsorption data, indicating that the adsorption process is controlled by chemical adsorption. In addition, the results of adsorption-desorption experiments indicated that BC/MnO2 have excellent regeneration ability. The experimental results of this study are significant for expanding the application of biochar composites in the treatment of aqueous solution containing antibiotics.

中文翻译:

用于从水溶液中去除抗生素的生物炭负载纳米二氧化锰复合材料的设计与合成

将二氧化锰纳米粒子负载到由稻壳制备的生物炭上,以获得生物炭负载的二氧化锰复合材料(BC/MnO2)。通过各种先进的表征技术,结合处理盐酸四环素 (TC) 和强力霉素 (DC) 水溶液的实验,研究了该复合材料的性能。结果表明,与原始生物炭相比,BC/MnO2表面出现了MnO2纳米颗粒,碳含量降低,氧含量增加。此外,BC/MnO2 表现出明显更大的总孔容和比表面积,并改善了生物炭的孔结构。pH值对BC/MnO2吸附TC和DC的影响不显着。随着吸附剂量的增加,TC和DC的去除率增加,BC/MnO2对TC的去除能力略高于对DC的去除能力。TC和DC在BC/MnO2表面的吸附符合Freundlich模型。与拟一级动力学模型相比,拟二级动力学模型(R2=0.999)更好地拟合了吸附数据,表明吸附过程受化学吸附控制。此外,吸附-解吸实验结果表明,BC/MnO2具有优异的再生能力。本研究的实验结果对于扩大生物炭复合材料在处理含抗生素水溶液中的应用具有重要意义。与拟一级动力学模型相比,拟二级动力学模型(R2=0.999)更好地拟合了吸附数据,表明吸附过程受化学吸附控制。此外,吸附-解吸实验结果表明,BC/MnO2具有优异的再生能力。本研究的实验结果对于扩大生物炭复合材料在处理含抗生素水溶液中的应用具有重要意义。与拟一级动力学模型相比,拟二级动力学模型(R2=0.999)更好地拟合了吸附数据,表明吸附过程受化学吸附控制。此外,吸附-解吸实验结果表明,BC/MnO2具有优异的再生能力。本研究的实验结果对于扩大生物炭复合材料在处理含抗生素水溶液中的应用具有重要意义。
更新日期:2020-05-22
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