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。