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A novel biomineralization regulation strategy to fabricate schwertmannite/graphene oxide composite for effective light-assisted oxidative degradation of sulfathiazole
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2023-02-07 , DOI: 10.1016/j.seppur.2023.123314
Xuqian Wang , Linli Dai , Siyu He , Yabo Wang , Yongkui Zhang

Iron-based heterogeneous catalysts exhibit great peroxymonosulfate (PMS) activation ability to degrade persistent antibiotic pollutants, but the catalytic efficiency of this process is significantly affected by Fe(III)/Fe(II) conversion rate. Herein, we designed a novel biomineralization regulation process to fabricate graphene oxide modified schwertmannite composites (Sch-GOx) as light-assisted PMS activator for enhancing sulfathiazole (STZ) degradation. More specifically, the introduction of GO in biomineralization process not only facilitated the dispersion of Sch, but also accelerated the regeneration of available surface-bound triple bondFe(II) in resultant Sch-GOx through intramolecular electron transfer, thus promoting the activation of PMS. Compared with biosynthesized Sch without modification, the prepared Sch-GO100 sample exhibited superior catalytic activity in light-assisted PMS activation process, 99.90 % removal efficiency of 78 μM STZ has been achieved within 30 min without pH adjustment (initial pH = 7.20). Abundant reactive oxygen species including SO4radical dot, radical dotOH, O2radical dot and 1O2 were responsible for the effective elimination of STZ. The potential degradation intermediates of STZ were investigated by liquid chromatography-mass spectrometry (LC-MS) and demonstrated to be less toxic than STZ using the ecological structure activity relationship program (ECOSAR). This study provided a facile and environmental-benign strategy of biomineralization regulation to fabricate effective iron-based PMS activator for environmental remediation.



中文翻译:

一种新型生物矿化调控策略制备施韦特曼石/氧化石墨烯复合材料以有效光辅助氧化降解磺胺噻唑

铁基非均相催化剂对过氧单硫酸盐 (PMS) 具有很强的降解持久性抗生素污染物的活化能力,但该过程的催化效率受 Fe(III)/Fe(II) 转化率的显着影响。在此,我们设计了一种新型生物矿化调节工艺来制造氧化石墨烯改性施韦特曼石复合材料 (Sch-GO x ) 作为光辅助 PMS 活化剂以增强磺胺噻唑 (STZ) 降解。更具体地说,在生物矿化过程中引入 GO 不仅促进了 Sch 的分散,而且加速了生成的 Sch-GO x三键中可用表面结合的 Fe(II) 的再生通过分子内电子转移,从而促进PMS的激活。与未经修饰的生物合成 Sch 相比,制备的 Sch-GO 100样品在光辅助 PMS 活化过程中表现出优异的催化活性,在 30 分钟内无需调整 pH 值(初始 pH = 7.20)即可实现 99.90% 的 78 μM STZ 去除效率。丰富的活性氧物质,包括 SO 4 部首点-部首点OH、O 2 部首点-1 O 2负责有效消除 STZ。通过液相色谱-质谱法 (LC-MS) 研究了 STZ 的潜在降解中间体,并使用生态结构活性关系程序 (ECOSAR) 证明其毒性低于 STZ。本研究提供了一种简便且环境友好的生物矿化调控策略,以制备用于环境修复的有效铁基 PMS 活化剂。

更新日期:2023-02-07
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