Nano-CuOx for ciprofloxacin effective removal via wet peroxide oxidation catalysis and its practical application in wastewater

IF 1.3 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Main Group Chemistry Pub Date : 2022-11-23 DOI:10.3233/mgc-220104

Dan Liu, Chang-Hong Shi, Yang Nie, Wenjun Peng, Yin-an Ming

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引用次数: 0

Abstract

Using Cu(NO3)2·3H2O as active material and citric acid (CA) as complexing agent, heterogeneous catalyst nano-CuOx was prepared by sol-gel method. The catalytic wet peroxide oxidation (CWPO) reaction system was established accordingly. The system was used to treat ciprofloxacin (CIP) in simulated wastewater and real wastewater. The effects of the molar ratio of metal salt to CA, calcination temperature, H2O2 dosage, reaction temperature, and catalyst dosage on the physicochemical structure and the properties of CWPO were investigated. The results showed that when the molar ratio of CA to metal salt (Cu(NO3)2·3H2O) was 1.8, the calcination temperature was 500 °C, the concentration of H2O2 was 10 mmol · L–1, the reaction temperature was 95 °C, and the dosage of catalyst was 1 g · L–1, CWPO system has the best degradation effect on CIP. At thses optical conditions, the removal rate reached 86.8%, chemical oxygen demand (COD) removal rate reached 54.9%, and the recycling rate of the catalyst was very good. The refractory organics in actual pharmaceutical wastewater could be oxidized by this system as well, and the COD removal rate reaches 47%. The degradation mechanism of CIP showed that the main functions of the CWPO system were ·O2– and ·OH radicals. The possible degradation pathways were determined by ion chromatography to be intermediate products generated from piperazine ring cleavage, defluorination, decarboxylation, and quinoline hydroxylation of CIP. The catalyzing mechanism was investigated in detail; some useful information was obtained in this work.

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纳米cuox湿式过氧化氢催化去除环丙沙星及其在废水中的实际应用

以Cu(NO3)2·3H2O为活性物质，柠檬酸(CA)为络合剂，采用溶胶-凝胶法制备了纳米cuox非均相催化剂。建立了湿式过氧化氢催化氧化反应体系。应用该系统对模拟废水和实际废水中的环丙沙星进行了处理。考察了金属盐与CA的摩尔比、煅烧温度、H2O2用量、反应温度和催化剂用量对CWPO的理化结构和性能的影响。结果表明，当CA与金属盐(Cu(NO3)2·3H2O)的摩尔比为1.8，煅烧温度为500℃，H2O2浓度为10 mmol·L-1，反应温度为95℃，催化剂用量为1 g·L-1时，CWPO体系对CIP的降解效果最好。在此光学条件下，催化剂的去除率达到86.8%，化学需氧量(COD)去除率达到54.9%，催化剂的回收率很好。该系统对实际制药废水中的难降解有机物也能进行氧化处理，COD去除率达到47%。CIP的降解机理表明，CWPO体系的主要功能是·O2 -和·OH自由基。通过离子色谱法确定了CIP可能的降解途径为哌嗪环裂解、脱氟、脱羧和喹啉羟基化产生的中间产物。详细探讨了催化机理;在这项工作中获得了一些有用的信息。

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来源期刊

Main Group Chemistry 化学-化学综合

CiteScore

2.00

自引率

26.70%

发文量

审稿时长

>12 weeks

期刊介绍： Main Group Chemistry is intended to be a primary resource for all chemistry, engineering, biological, and materials researchers in both academia and in industry with an interest in the elements from the groups 1, 2, 12–18, lanthanides and actinides. The journal is committed to maintaining a high standard for its publications. This will be ensured by a rigorous peer-review process with most articles being reviewed by at least one editorial board member. Additionally, all manuscripts will be proofread and corrected by a dedicated copy editor located at the University of Kentucky.