纳米零价铁协同凹凸棒土@壳聚糖增强类芬顿催化剂用于处理垃圾渗滤液。
Flocculation synergistic with nano zero-valent iron augmented attapulgite @ chitosan as Fenton-like catalyst for the treatment of landfill leachate.
机构信息
School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui, People's Republic of China.
College of Chemistry and Chemical Engineering, Neijiang Normal University, Neijiang, Sichuan, People's Republic of China.
出版信息
Environ Technol. 2023 Sep;44(23):3605-3613. doi: 10.1080/09593330.2022.2068377. Epub 2022 May 4.
In this study, nano-zero-valent iron (NZVI) was added to attapulgite/chitosan and used as a catalyst in the heterogeneous Fenton process to degrade stabilized landfill leachate. Landfill leachate has serious environmental impacts due to the complexity and diversity of its pollutants. A magnetic catalyst (NZVI@PATP/CS) was prepared by a liquid-phase reduction method. The NZVI@PATP/CS were characterized by XRD, FTIR and SEM. The pH of leachate and the dosage of catalyst and HO were changed to determine the best-operating conditions for the effective removal of chemical oxygen demand (COD) and total phosphorus(TP). To understand the adsorption degradation mechanism, the quenching experiments of free radicals were carried out. The results showed that the degradation rates of COD and TP were 66% and 92%, respectively, under the optimum pH value of 8, the dosage of HO of 5 mL, and the dosage of the catalyst of 0.25 g for 60 min.
在这项研究中，纳米零价铁 (NZVI) 被添加到凹凸棒土/壳聚糖中，并作为非均相芬顿工艺中的催化剂用于降解稳定化垃圾渗滤液。由于其污染物的复杂性和多样性，垃圾渗滤液对环境有严重的影响。通过液相还原法制备了磁性催化剂 (NZVI@PATP/CS)。通过 XRD、FTIR 和 SEM 对 NZVI@PATP/CS 进行了表征。改变渗滤液的 pH 值以及催化剂和 HO 的用量，以确定有效去除化学需氧量 (COD) 和总磷 (TP) 的最佳操作条件。为了了解吸附降解机制，进行了自由基猝灭实验。结果表明，在最佳 pH 值为 8、HO 用量为 5 mL、催化剂用量为 0.25 g 的条件下，COD 和 TP 的降解率分别为 66%和 92%，反应时间为 60 min。
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