球磨诱导的板状亚微结构铁在真实土壤环境中增强DDT的降解,ACS Omega

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球磨诱导的板状亚微结构铁在真实土壤环境中增强DDT的降解
ACS Omega ( IF 3.7 ) Pub Date : 2018-06-27 00:00:00 , DOI: 10.1021/acsomega.8b00479
Shenghong Kang _{1,

2} , Guozhong Wang ₁ , Huijun Zhao ₁ , Weiping Cai _{1,

2}

Affiliation

修复被1,1,1-三氯-2,2-双（4-氯苯基）乙烷（DDT）污染的土壤是一项挑战。本文研究了球磨诱导的板状亚微结构零价铁（SMZVI）在真实土壤环境中对滴滴涕的降解性能。已经发现，在酸性条件下，这种SMZVI在土壤中对DDT的降解性能比市售ZVI粉末高得多。在添加了50 mg g ^–1的5 ppm DDT的土壤中，超过95％的DDT可能在80分钟内降解。SMZVI，比以前报告的结果好得多。时间相关的滴滴涕去除量可以通过伪一阶动力学模型很好地描述。进一步的实验表明，ZVI的用量，表面活性剂和酸性添加剂以及浆液中土壤与水的重量比对DDT降解很重要，降解产物主要是DDD（氯含量较低的产物）。提出了一种酸辅助的ZVI诱导的还原性脱氯方法，该方法可以很好地解释DDT在土壤中的降解行为以及其他因素的影响。这项工作不仅加深了对基于ZVI的土壤中DDT降解的理解，而且证明了SMZVI可能是在实际环境中降解DDT的有前途的材料。

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Ball Milling-Induced Plate-like Sub-microstructured Iron for Enhancing Degradation of DDT in a Real Soil Environment

The remediation of soil contaminated by 1,1,1-trichloro-2,2-bis(4-chlorophenyl) ethane (DDT) has been a challenge. In this paper, the degradation performances of the ball milling-induced plate-like sub-microstructured zero valent iron (SMZVI) to DDT in a real soil environment is studied. It has been found that such SMZVI exhibits much higher degradation performances to DDT in soil than commercial ZVI powders under acidic conditions. More than 95% DDT could be degraded within 80 min in the 5 ppm DDT-contaminated soil with addition of 50 mg g^–1 SMZVI, which is much better than the previously reported results. The time-dependent DDT removal amount can be well described by the pseudo first-order kinetic model. Further experiments have revealed that the ZVI dosages, surfactant’s and acidic additions, and the weight ratio of soil-to-water in the slurries are important to DDT degradation, and the degradation products were mainly DDD (a product with less chlorine). An acid-assisted ZVI-induced reductive dechlorination process is proposed, which can well explain the DDT degradation behaviors in soil and the influence from the other factors. This work not only deepens the understanding of DDT degradation in soils based on ZVI but also demonstrates that the SMZVI could be a promising material for DDT degradation in real environments.

更新日期：2018-06-27

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