Degradation of sulfamethoxazole by peroxymonosulfate activated by waste eggshell supported Ag2O-Ag nano-particles
Degradation of sulfamethoxazole by peroxymonosulfate activated by waste eggshell supported Ag2O-Ag nano-particles
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DOI：
10.1016/j.cej.2020.126719
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发表时间：
2021-02-01
影响因子：
15.1
通讯作者：
Cheng, Xiuwen
中科院分区：
文献类型：
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作者：
Gao, Yingjie;Zhao, Qi;Cheng, Xiuwen
高级氧化工艺（AOPs）在抗生素的消除中起着至关重要的作用，其中必须探索环境友好，廉价和有效的催化剂。本研究以简单的方法合成了Ag 2 O-g/蛋壳催化剂，并将其与过一硫酸盐（PMS）联用，同时去除磺胺甲恶唑（SMX）。然后，采用一系列的技术手段对催化剂的物化性质进行了研究。结果表明，银物种呈球形结构，均匀分布在蛋壳表面。当Ag 2 O-Ag/蛋壳为0.1 g.L-1，PMS为0.16 mM，SMX为10 mg.L-1，初始pH为6.42时，PMS对SMX的活化降解率为94.6%。此外，还系统研究了催化剂用量、PMS用量、pH值、共存阴离子、腐殖酸（HA）和水体基质等因素对SMX降解的影响。此外，还进行了清除自由基的实验，以区分活性自由基。此外，为了提高粉末状Ag 2 O-Ag/蛋壳的可重复使用性，制备了相应的微孔滤膜。并提出了可能的反应机理。因此，这些结果表明，废蛋壳被认为是一个有前途的载体材料的金属催化剂，用于催化降解水中的抗生素。
Advanced Oxidation Processes (AOPs) play a critical role in the elimination of antibiotics, in which it is essential to explore an environmentally friendly, cheap and effective catalyst. In this study, Ag2O-g/eggshell catalyst had been synthesized in a simple strategy, combining with peroxymonosulfate (PMS) to simultaneous remove sulfamethoxazole (SMX). Then, physicochemical properties of catalyst were investigated by series of techniques. Results indicated the Ag species was featured with a spherical-like structure and homogeneously distributed on the surface of eggshell. In addition, Ag2O-Ag/eggshell exhibited high degradation efficiency of SMX by activation of PMS (94.6%) under the optimized conditions of 0.1 g.L-1 Ag2O-Ag/eggshell, 0.16 mM PMS, 10 mg.L-1 SMX and initial pH 6.42. Moreover, several parameters such as the dosage of catalyst, PMS and the effect of pH, co-existing anions, humic acid (HA) and water matrices on SMX degradation were systematically studied. Besides, scavenging experiments were conducted to distinguish the active radicals. Furthermore, to improve the reusability of powder Ag2O-Ag/eggshell, corresponding Microporous Filter Membrane had been synthesized. Subsequently, possible reaction mechanism was proposed. Consequently, these results revealed that the waste eggshell was considered as a promising supporting material for the metal catalyst for the catalytic degradation of antibiotics in water.