A novel solid digestate-derived biochar-Cu NP composite activating H2O2 system for simultaneous adsorption and degradation of tetracycline
A novel solid digestate-derived biochar-Cu NP composite activating H2O2 system for simultaneous adsorption and degradation of tetracycline
复制标题
一种新型固体消化物衍生的生物炭-Cu NP复合物活化H2O2系统，用于同时吸附和降解四环素
DOI：
10.1016/j.envpol.2016.11.078
复制
发表时间：
2017-02-01
影响因子：
8.9
通讯作者：
Li, Qingbiao
中科院分区：
文献类型：
--
作者：
Fu, Dun;Chen, Zheng;Li, Qingbiao
固体沼气是厌氧消化系统的副产品，已导致一系列环境问题。在本研究中，我们合成了一种新型的用于去除水介质中四环素的固体生物炭-铜纳米颗粒复合材料。在过氧化氢(H_2O_2，20 mM)存在和无过氧化氢(H_2O_2，20 mM)存在下，生物炭-铜纳米粒复合材料(0.5g L-1)在反应6h内对四环素(200mgL-1)的去除效率分别为31.5%和97.8%。用液-质联用法研究了四环素可能的降解途径。解吸实验结果表明，反应后的复合材料上没有检测到明显的四环素浓度，但有少量的中间产物占总有机碳(TOC)的3.1%，最终产物NH4+被生物炭片吸附的比例为23.3%。分散在生物炭上的纳米铜颗粒增加了生物炭的比表面积和孔容，从而提高了对四环素的吸附和降解效率。相对的四环素去除机理主要归因于铜(II)/铜(I)与H_2O_2的氧化还原反应和生物炭中自由基电子转移过程中中心点羟基的生成。该方法具有废渣再利用和抗生素污染物处理的双重目的，本研究重点研究了分散的铜纳米颗粒与来自四环素废渣的生物炭耦合后对过氧化氢的活化作用。(C)爱思唯尔有限公司出版的2016年。
Solid digestate, a by-product of anaerobic digestion systems, has led to a range of environmental issues. In the present study, a novel composite based on a solid digestate-biochar-Cu NP composite was synthesized for tetracycline removal from an aqueous medium. The removal efficiency values for tetracycline (200 mg L-1) were 31.5% and 97.8%, respectively, by the biochar-Cu NP composite (0.5 g L-1) in the absence and presence of hydrogen peroxide (H2O2, 20 mM) within 6 h of reaction time. The possible degradation pathway of tetracycline was investigated using liquid chromatography-mass spectrometry. The desorption experiment results suggested that no significant concentration of tetracycline was detected on the composite after the reaction, but a small amount of intermediates in terms of total organic carbon (TOC) accounting for 3.1%, and 23.3% of the end-product NH4+ was adsorbed onto the biochar sheets. The dispersive Cu NPs on the biochar resulted in an increase in the surface area and pore volume of the biochar-Cu NP composite, which enhanced tetracycline adsorption as well as the degradation efficiency. Relative tetracycline removal mechanisms were dominantly ascribed to center dot OH generation from the Cu(II)/Cu(I) redox reaction with H2O2 and the electron-transfer process of free radicals (FRs) in biochar. The proposed approach serves dual purposes of waste digestate reuse and treatment of antibiotic pollutants.This study highlights the activation of H2O2 by the dispersive Cu NPs coupling with biochar derived from a waste solid digestate for tetracycline treatment. (C) 2016 Published by Elsevier Ltd.