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Natural bornite as an efficient and cost-effective persulfate activator for degradation of tetracycline: Performance and mechanism
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2019-09-05 , DOI: 10.1016/j.cej.2019.122717
Xin Zhang , Honghu Deng , Guoquan Zhang , Fenglin Yang , Guang-En Yuan

Natural bornite (NBo), a kind of Fe-Cu bimetallic sulfide mineral, was selected as an efficient activator for persulfate (PS) to degrade a typical antibiotic, tetracycline (TC). The removal percentage of TC got up to 81.6% in 180 min in the NBo/PS system with a mineralization efficiency of 48.7%. Experiment results showed that the released Fe had played a more important role than Cu in the degradation process. Reductive sulfur in the NBo catalyst could enhance the regeneration of Fe2+ and thus improve the degradation efficiency of TC by activated PS. The results of radical-quenching and electron paramagnetic resonance tests demonstrated that the dominant reactive oxygen species responsible for TC degradation were OH, SO4 and O2 in the NBo/PS system. The generated O2 was originated from dissolved oxygen rather than PS, but PS could accelerate the reduction process of O2 to O2 by NBo. NBo dosage, PS concentration, initial solution pH and common inorganic anions (Cl and H2PO4) all had significant effects on TC removal. NBo was considerable stable in catalyzing PS for TC degradation. This work demonstrates an efficient and cost-effective catalyst towards PS for organic pollutant removal and provides new insight into the mechanism of heterogeneous activation of PS by Fe-Cu bimetallic sulfide.



中文翻译:

天然褐铁矿作为降解四环素的高效,低成本的过硫酸盐活化剂:性能和机理

天然铁矿(NBo)是一种铁-铜双金属硫化物矿物,被选作过硫酸盐(PS)降解典型抗生素四环素(TC)的有效活化剂。在NBo / PS系统中,TC在180分钟内的去除率达到81.6%,矿化效率为48.7%。实验结果表明,在降解过程中,所释放的铁比铜起着更重要的作用。NBo催化剂中的还原硫可以增强Fe 2+的再生,从而提高活化PS对TC的降解效率。自由基淬火和电子顺磁共振试验的结果表明,负责TC降解的主导活性氧种是OH,SO 4 -和O 2 -在NBo / PS系统中。所生成的直径:2 -起源于溶解氧,而不是PS,但PS可能加速的O-还原过程2至O 2 -由NBO。NBO剂量,PS浓度,初始溶液的pH值和共同的无机阴离子(氯-和H 2 PO 4 - )的所有对TC去除显著影响。NBo在催化PS降解TC方面相当稳定。这项工作证明了一种用于去除有机污染物的PS的有效且具有成本效益的催化剂,并为Fe-Cu双金属硫化物对PS的异质活化机理提供了新的见解。

更新日期:2019-09-05
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