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首页> 外文期刊>Environmental Science & Technology >Sonochemical Dissolution of Cinnabar (α-HgS)
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Sonochemical Dissolution of Cinnabar (α-HgS)

机译：朱砂的声化学溶解（α-HgS）

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摘要

To investigate the sonochemical dissolution of cinnabar, sulfur oxidation products (S_(ox)) and dissolved Hg(ll) released into the aqueous solution were determined. Detected S_(ox) in the presence of ultrasound suggests that dissolution of cinnabar occurred. Terephthalic acid (TA) used to scavenge ·OH in bulk solution formed from sonication showed that oxidative dissolution occurred in both the bulk solution and the interfacial areas of cavitation bubbles. Dissolved S(-Ⅱ) was not detected, and SO_4~(2-) was the main S_(ox) indicating that the formation of S(-Ⅱ) from cinnabar by physical and thermal effects of sonication was the rate-limiting step. Hg(Ⅱ) released was much lower than S species measured. Hg(Ⅱ) adsorption isotherms indicated that dissolved Hg(Ⅱ) adsorbed back onto the remaining cinnabar particles lowering Hg(Ⅱ) release. Ultrasound significantly reduced cinnabar particle size and increased surface area, leading to higher Hg(Ⅱ) adsorption. In addition, the cinnabar surface isoelectric point (IEP) increased after sonication, indicating adsorption of Hg(Ⅱ) and/ or mineral phase transformation from cinnabar to metacinnabar. The presence of humic acid (HA) and ultrasound enhanced cinnabar dissolution and greatly increased the dissolved Hg(Ⅱ) concentration due to the synergistic effects of ultrasound and HA.
机译：为了研究朱砂的声化学溶解，测定了释放到水溶液中的硫氧化产物（S_（ox））和溶解的Hg（II）。在超声波存在下检测到的S_（ox）表明朱砂溶解。对苯二酸（TA）用来清除超声处理形成的本体溶液中的·OH，表明在本体溶液和空化气泡的界面区域都发生了氧化溶解。没有检测到溶解的S（-Ⅱ），而SO_4〜（2-）是主要的S_（ox），表明通过超声作用的物理和热作用由朱砂形成S（-Ⅱ）是限速步骤。释放出的Hg（Ⅱ）远低于测得的S物种。 Hg（Ⅱ）的吸附等温线表明，溶解的Hg（Ⅱ）重新吸附到残留的朱砂颗粒上，降低了Hg（Ⅱ）的释放。超声波可显着减小朱砂颗粒大小并增加表面积，从而导致更高的Hg（Ⅱ）吸附。另外，超声处理后，朱砂表面等电点（IEP）升高，表明汞（Ⅱ）的吸附和/或矿物相从朱砂到后朱砂的转变。腐殖酸（HA）和超声的存在增强了朱砂的溶出，并由于超声和HA的协同作用而大大提高了溶出的Hg（Ⅱ）浓度。

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  • 来源
    《Environmental Science & Technology》 |2007年第3期|p.773-778|共6页
  • 作者

    ZIQI HE; SAMUEL J. TRAINA; LINDA K. WEAVERS;

  • 作者单位

    Department of Civil and Environmental Engineering and Geodetic Science, The Ohio State University, Columbus, Ohio 43210;

  • 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 环境化学;
  • 关键词

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