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Aqueous arsenite removal by simultaneous ultraviolet photocatalytic oxidation-coagulation of titanium sulfate

机译：硫酸钛的同时紫外光催化氧化-混凝去除亚砷酸水溶液

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摘要

This study explored the efficacy and efficiency of a simultaneous UV-catalyzed oxidation-coagulation process of titanium sulfate (UV/Ti(SO4)(2)) for efficient removal of As(III) from water. It revealed that, As(III) could be oxidized to As(V) during the UV catalyzed coagulation of Ti(SO4)(2) with highly efficient As(III) removal in the pH range 4-6. The UV catalyzed oxidation-coagulation showed surprisingly effective oxidation of As(III) to As(V) within a short time. XPS indicated that 84.7% of arsenic on the coagulated precipitate was in the oxidized form of As(V) after the UV/Ti(SO4)(2) treatment of As(III) aqueous solutions at pH 5. Arsenic remaining in solution at high pH was in the oxidized form As(V). Removal efficiencies of As(III) were investigated as a function of pH, Ti(SO4)(2) dosage, initial As(III) concentration and irradiation energy. As(III) could almost completely be removed (>99%) by the photocatalytic oxidation-coagulation process with a moderate dose of Ti(SO4)(2) in the pH range 4-6 at an initial arsenic concentration of 200 mu g/L. The mechanisms of the photocatalytic coagulation oxidation of Ti(SO4)(2) are similar to those of UV/crystalline TiO2 particles, involving the formation and reactions of the hydroxyl radical OH center dot and superoxide HO2 center dot/O-2(center dot-). (C) 2015 Elsevier B.V. All rights reserved.
机译：这项研究探讨了硫酸钛（UV / Ti（SO4）（2））的同时UV催化氧化-混凝工艺从水中有效去除As（III）的功效和效率。结果表明，在pH范围为4-6的高效去除As（III）的过程中，Ti（SO4）（2）的UV催化凝聚过程中，As（III）可以被氧化为As（V）。紫外线催化的氧化凝结在短时间内显示出惊人的有效地将As（III）氧化为As（V）。 XPS表明，在pH 5的As（III）水溶液经UV / Ti（SO4）（2）处理后，凝结沉淀上的砷的84.7％为As（V）的氧化形式。 pH值为As（V）的氧化形式。研究了As（III）的去除效率与pH，Ti（SO4）（2）剂量，初始As（III）浓度和辐射能的关系。在初始砷浓度为200μg/ g的条件下，通过中等剂量的Ti（SO4）（2）在4-6的pH范围内，通过光催化氧化-凝固过程几乎可以完全去除（> 99％）As（III）。 L. Ti（SO4）（2）的光催化凝聚氧化机理与UV /结晶TiO2颗粒相似，涉及羟基自由基OH中心点和超氧HO2中心点/ O-2（中心点）的形成和反应-）。 （C）2015 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of Hazardous Materials》 |2016年第13期|162-170|共9页
  • 作者

    Wang Yuxia; Duan Jinming; Li Wei; Beecham Simon; Mulcahy Dennis;

  • 作者单位

    Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Key Lab Northwest Water Resources Environm & Ecol, MOE, Xian 710055, Peoples R China;

    Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Key Lab Northwest Water Resources Environm & Ecol, MOE, Xian 710055, Peoples R China|Univ S Australia, Sch Nat & Built Environm, Ctr Water Management & Reuse, Adelaide, SA 5001, Australia;

    Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Key Lab Northwest Water Resources Environm & Ecol, MOE, Xian 710055, Peoples R China;

    Univ S Australia, Sch Nat & Built Environm, Ctr Water Management & Reuse, Adelaide, SA 5001, Australia;

    Univ S Australia, Sch Nat & Built Environm, Ctr Water Management & Reuse, Adelaide, SA 5001, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Arsenite removal; Photocatalytic oxidation; Coagulation; Titanium salts;

    机译：脱砷;光催化氧化;混凝;钛盐;

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