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首页> 外文期刊>Environmental Science & Technology >Combining Ferric Salt and Cactus Mucilage for Arsenic Removal from Water
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Combining Ferric Salt and Cactus Mucilage for Arsenic Removal from Water

机译：结合铁盐和仙人掌黏液去除水中的砷

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摘要

New methods to remediate arsenic-contaminated water continue to be studied, particularly to fill the need for accessible methods that can significantly impact developing communities. A combination of cactus mucilage and ferric (Fe(Ⅲ)) salt was investigated as a flocculation-coagulation system to remove arsenic (As) from water. As(Ⅴ) solutions, ferric nitrate, and mucilage suspensions were mixed and left to stand for various periods of time. Visual and SEM observations confirmed the flocculation action of the mucilage as visible flocs formed and settled to the bottom of the tubes within 3 min. The colloidal suspensions without mucilage were stable for up to 1 week. Sample aliquots were tested for dissolved and total arsenic by ICP-MS and HGAFS. Mucilage treatment improved As removal (over Fe(Ⅲ)-only treatment); the system removed 75-96% As in 30 min. At neutral pH, removal was dependent on Fe(Ⅲ) and mucilage concentration and the age of the Fe(Ⅲ) solution. The process is fast, achieving maximum removal in 30 min, with the majority of As removed in 10-15 min. Standard jar tests with 1000 μg/L As(Ⅲ) showed that arsenic removal and settling rates were pH-dependent; As removal was between 52% (high pH) and 6696 (low pH).
机译：继续研究补救砷污染水的新方法，特别是为了满足对可显着影响发展中社区的无障碍方法的需求。研究了一种仙人掌黏液和三价铁（Fe（Ⅲ）盐）的组合物作为絮凝混凝系统以去除水中的砷（As）。作为（Ⅴ）溶液，将硝酸铁和粘液悬浮液混合并静置不同的时间。视觉和SEM观察证实了粘液的絮凝作用，因为可见的絮凝物在3分钟内形成并沉降到管的底部。没有粘液的胶体悬浮液稳定长达1周。通过ICP-MS和HGAFS测试样品等分试样中的溶解砷和总砷。粘液处理提高了砷的去除率（优于仅铁（Ⅲ）处理）；系统在30分钟内去除了75-96％的砷。在中性pH值下，去除率取决于Fe（Ⅲ）和黏液浓度以及Fe（Ⅲ）溶液的年龄。该过程非常快，在30分钟内即可达到最大去除率，而大部分砷在10-15分钟内即可去除。用1000μg/ L As（Ⅲ）进行的标准广口瓶测试表明，砷的去除和沉降速度取决于pH。去除率在52％（高pH）和6696（低pH）之间。

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  • 来源
    《Environmental Science & Technology》 |2016年第5期|2507-2513|共7页
  • 作者

    Dawn I. Fox; Daniela M. Stebbins; Norma A. Alcantar;

  • 作者单位

    Department of Chemistry, University of Guyana, Turkeyen Campus, Greater Georgetown, Guyana;

    Department of Chemical & Biomedical Engineering, University of South Florida, 4202 E Fowler Ave ENB 118, Tampa Florida 33620, United States;

    Department of Chemical & Biomedical Engineering, University of South Florida, 4202 E Fowler Ave ENB 118, Tampa Florida 33620, United States;

  • 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);
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  • 正文语种 eng
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