• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >A novel zero valent metal bismuth for bromate removal: direct and ultraviolet enhanced reduction
【24h】

A novel zero valent metal bismuth for bromate removal: direct and ultraviolet enhanced reduction

机译：一种新型零价金属铋，用于溴酸酯去除：直接和紫外线增强

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Bromate (BrO3-) is a carcinogenic and genotoxic by-product of the ozone disinfection process. In this study, a new zero-valent metal, bismuth, was used to reduce bromate. Bismuth samples were prepared by a solvothermal method and characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The morphology of the bismuth powder was microspheres assembled with dense nanosheets. The kinetics of the direct bromate reduction by bismuth accorded with the pseudo-first-order kinetics model. The rate coefficients of the initial bromate concentration of 1.00 mg L-1, 2.50 mg L-1, 5.00 mg L-1 were identically close to 0.08 min(-1). For 0.20 mg L-1, a reaction rate coefficient near 0.10 min(-1) was obtained. The reducing products of bromate included bromide ions (Br-) and bismuth oxybromides. The bromate removal efficiency was enhanced remarkably in the presence of ultraviolet (UV) light, and the corresponding kinetic coefficient was 4 times higher than that of direct reduction. The mechanism of ultraviolet enhancement was analyzed by diffuse reflectance spectroscopy (DRS), the density functional theory (DFT) calculation, open circuit potential (OCP) analysis, photocurrent measurement and linear sweep voltammetry (LSV). Besides, the influence of dissolved oxygen (DO) on bromate reduction efficiency and the sustainability of the as-prepared sample were investigated. DO inhibited the reduction rate obviously, but showed a slight effect on the formation of bromide ions. In the long-term periodic experiments, the kinetic coefficient decay occurred in both direct (without UV irradiation) and ultraviolet assisted bromate reduction. However, the kinetic coefficient of UV-assisted reduction (0.115 min(-1)) was about 2 times higher than that of the direct reduction in the last cycle of periodic experiments. In conclusion, the novel bromate reduction strategy based on the zero-valent bismuth metal material has been proved efficient and sustainable, which contributes to the development of drinking water treatment technologies.
机译：溴酸盐（Bro3-）是臭氧消毒过程的致癌和遗传毒性副产物。在这项研究中，使用了一种新的零价金属，铋，用于减少溴酸盐。通过溶剂热法制料制备铋样品，并通过粉末X射线衍射（PXRD），扫描电子显微镜（SEM）和透射电子显微镜（TEM）。铋粉的形态是用致密纳米片组装的微球。铋的直接溴化物减少的动力学符合伪第一阶动力学模型。初始溴酸浓度为1.00mg L-1，2.50mg L-1，5.00mg L-1的速率系数与0.08 min（-1）相同。对于0.20mg L-1，得到反应速率系数近0.10分钟（-1）。溴酸盐还原产物包括溴离子（Br-）和羟基溴化物。在紫外（UV）光存在下显着提高溴酸酯去除效率，并且相应的动力系数比直接还原的动力学系数高4倍。通过漫反射谱（DRS），密度泛函理论（DFT）计算，开路电位（OCP）分析，光电流测量和线性扫描伏安法（LSV）分析紫外线增强机理。此外，研究了溶解氧（DO）对溴酸盐还原效率的影响及其制备样品的可持续性。确实抑制了减少率明显，但对溴离子的形成表现出轻微的影响。在长期的周期性实验中，直接（没有紫外线照射）和紫外线溴酸盐还原的动力学系数衰减。然而，UV辅助还原的动力学系数（0.115分钟（-1））比周期性实验的最后循环直接减少的约2倍。总之，基于零价铋金属材料的新型溴酸盐还原策略已经有效和可持续，有助于饮用水处理技术的发展。

著录项

  • 来源
    《RSC Advances》 |2020年第7期|共8页
  • 作者

    Huang Hong; Liu Guoshuai; Wang Xiuheng;

  • 作者单位

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Peoples R China;

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Peoples R China;

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号