Efficient degradation of sulfamethazine via activation of percarbonate by chalcopyrite
Efficient degradation of sulfamethazine via activation of percarbonate by chalcopyrite
复制标题
通过黄铜矿活化过碳酸盐有效降解磺胺二甲嘧啶
DOI：
10.1016/j.watres.2021.117451
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发表时间：
2021
期刊：
影响因子：
12.8
通讯作者：
Zilan Jin
中科院分区：
文献类型：
--
作者：
Yangju Li;Haoran Dong;Long Li;Junyang Xiao;Shuangjie Xiao;Zilan Jin
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, CuFeS2dosage, 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−1at pH = 7.1). The mechanism of SPC activation by CuFeS2was 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 CuFeS2surface. 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.
