Efficient degradation of sulfamethazine via activation of percarbonate by chalcopyrite

化学 单线态氧 激进的 黄铜矿 无机化学 猝灭(荧光) 电子顺磁共振 催化作用 降级(电信) 羟基自由基 氧气 硫黄 光化学 有机化学 荧光 物理 核磁共振 量子力学 电信 计算机科学
作者
Yangju Li,Haoran Dong,Long Li,Junyang Xiao,Shuangjie Xiao,Zilan Jin
出处
期刊:Water Research [Elsevier BV]
卷期号:202: 117451-117451 被引量:166
标识
DOI:10.1016/j.watres.2021.117451
摘要

In this work, the novel application of chalcopyrite (CuFeS2) for sodium percarbonate (SPC) activation towards sulfamethazine (SMT) degradation was explored. Several key influencing factors like SPC concentration, CuFeS2 dosage, reaction temperature, pH value, anions, and humic acid (HA) were investigated. Experimental results indicated that SMT could be effectively degraded in the neutral reaction media by CuFeS2/SPC process (86.4%, 0.054 min−1 at pH = 7.1). The mechanism of SPC activation by CuFeS2 was elucidated, which was discovered to be a multiple reactive oxygen species (multi-ROS) process with the coexistence of hydroxyl radical (•OH), carbonate radical (CO3•−), superoxide radical (O2•−), and singlet oxygen (1O2), as evidenced by quenching experiments and electron spin resonance (ESR) tests. The generated •OH via the traditional heterogeneous Fenton-like process would not only react with carbonate ions to yield other ROS but also involve in SMT degradation. The abundant surface-bound Fe(II) was deemed to be the dominant catalytic active sites for SPC activation. Meanwhile, it was verified that the reductive sulfur species, the interaction between Cu(I) and Fe(III) as well as the available O2•− derived from the activation of molecular oxygen and the conversion of •OH favored the regeneration of Fe(II) on CuFeS2 surface. Furthermore, the degradation intermediates of SMT and their toxicities were evaluated. This study presents a novel strategy by integrating transition metal sulfides with percarbonate for antibiotic-contaminated water treatment.
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