Nano Sulfur-Coated Diatomite for Enhanced Chromate Removal by Sulfide Reduction
文献类型：期刊论文
| 作者 | Li, Jiao; Shi, Mei; Cai, Jianchao; Ju, Yiwen; Zhang, Liang; Guo, Caiyang; Li, Juan; Xing, Xing; Zheng, Jianzhong |
| 刊名 | JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
 |
| 出版日期 | 2017-12-01 |
| 卷号 | 17期号:9页码:6686-6691 |
| 关键词 | Chromate Sulfide Reaction Kinetics Catalysis Sulfur-coated Diatomite |
| 英文摘要 | Site remediation of chromate-contaminated soil and groundwater by reductive immobilization desires that the system's reaction kinetics be substantially improved especially when the media's pH is high. The objectives of the current study were to prepare a sulfur-coated diatomite catalyst and examine its capability in catalyzing chromate reduction by sulfide in the pH domain of 8-10. Results showed that nano sulfur particles can be readily coated on an otherwise hydrophilic diatomite surface post sequential treatments of acid and base cleaning and cetyl trimethyl ammonium bromide, by mixing the modified dolomite in a colloidal solution of nano-sulfur particles generated through an in situ reaction of thiosulfate and HCI. Sulfur-coated diatomite thus synthesized was not able to reduce chromate, but could improve the reaction kinetics of chromate-sulfide at pH 8-9, although only a limited improvement was observed at pH 10. Systems with higher loading rates of sulfur coated diatomite also had faster reaction kinetics. Two potential mechanisms that involved either sulfide-adsorbed sulfur particles on the diatomite surface and/or polysulfide formation due to an interfacial chemical reaction of the coated-elemental sulfur and sulfide in solution were invoked to interpret the observed phenomena. Findings of this study have significant implications for in situ reductive immobilization by the sulfide of chromate-contaminated sites, particularly those having slow reaction rates due to an elevated pH. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/39368]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Li, Jiao,Shi, Mei,Cai, Jianchao,et al. Nano Sulfur-Coated Diatomite for Enhanced Chromate Removal by Sulfide Reduction[J]. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY,2017,17(9):6686-6691. |
| APA | Li, Jiao.,Shi, Mei.,Cai, Jianchao.,Ju, Yiwen.,Zhang, Liang.,...&Zheng, Jianzhong.(2017).Nano Sulfur-Coated Diatomite for Enhanced Chromate Removal by Sulfide Reduction.JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY,17(9),6686-6691. |
| MLA | Li, Jiao,et al."Nano Sulfur-Coated Diatomite for Enhanced Chromate Removal by Sulfide Reduction".JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 17.9(2017):6686-6691. |
入库方式： OAI收割
来源：生态环境研究中心
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