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首页> 外文学位 >Removal of an emerging contaminant (tris-2- chloroethyl phosphate) from water and wastewater through adsorption to zeolite beta.
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Removal of an emerging contaminant (tris-2- chloroethyl phosphate) from water and wastewater through adsorption to zeolite beta.

机译：通过吸附到沸石β中去除水和废水中的新兴污染物（磷酸三-2-氯乙基乙酯）。

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摘要

Emerging contaminants are becoming a global environmental problem as there is increasing information linking them to environmental and human health hazards. Identification and mitigation of these constituents at the source before entering the environment is crucial if impacts to the ecosystem and humans are to be eliminated. One emerging contaminant of interest is tris-2-chloroethyl phosphate (TCEP), an organo-phosphate ester used as a plasticizer and flame retardant. TCEP is of special interest due to potential toxicity, prevalence in the environment, and difficult to remove through conventional wastewater treatment operations. This work presents a methodology of zeolite material review and selection. Equilibrium capacity of TCEP using Zeolite beta was determined for both 25:1 and 300:1 silica:alumina ratios. Excellent removal (>97%) of TCEP from solution was achieved. Adsorption at an acidic initial solution pH (4.8 S.U.) exhibited the highest adsorption capacity compared to neutral or alkaline pH values. Maximum adsorption capacities of 77 mg/g (25:1) and 103 mg/g (300:1) were obtained. To describe a diffusion-limited adsorption uptake, a configurational diffusion (CD) model is proposed to simulate variable diffusivity in the uptake of TCEP in zeolite. The CD model showed flexibility to fit both materials better than existing models using constant or single diffusivity values. Fast diffusion (near equilibrium conditions were reached in <60 minutes) was observed. Both equilibrium and kinetics of TCEP adsorption were evaluated in surrogate background (natural organic material and salts) and in a competitive adsorption environment with methyl tert-butyl ether (MTBE). Natural organic material (NOM) and salt reduced maximum adsorption capacity by up to 30% compared to DI, but showed a negligible effect at equilibrium potential concentrations of environmental interest. MTBE reduced adsorption capacity of TCEP by approximately 30 to 50%. The CD model represented the diffusion in the surrogate water background well, showing that addition of MTBE decreased the mobility of TCEP during diffusion. The results show that Zeolite beta is a successful approach to remove TCEP from water and wastewater matrices and could be a useful technology to treat other hydrophilic persistent ECs.
机译：随着越来越多的信息将新兴污染物与环境和人类健康危害联系起来，它们正在成为全球环境问题。如果要消除对生态系统和人类的影响，在进入环境之前从源头识别和减轻这些成分至关重要。一种令人关注的新兴污染物是磷酸三-2-氯乙基乙酯（TCEP），一种用作增塑剂和阻燃剂的有机磷酸酯。由于潜在的毒性，环境中的普遍性以及难以通过常规废水处理操作将其清除，TCEP引起了人们的特别关注。这项工作提出了一种沸石材料审查和选择的方法。对于25：1和300：1的二氧化硅：氧化铝比率，确定了使用沸石β的TCEP的平衡容量。 TCEP从溶液中的去除效果极佳（> 97％）。与中性或碱性pH值相比，在酸性初始溶液pH值（4.8S.U.）下的吸附表现出最高的吸附能力。获得的最大吸附容量为77 mg / g（25：1）和103 mg / g（300：1）。为了描述扩散受限的吸附吸收，提出了一种构型扩散（CD）模型，以模拟在沸石中TCEP吸收的可变扩散率。 CD模型显示出比使用恒定或单个扩散率值的现有模型更好地适合两种材料的灵活性。观察到快速扩散（在＜60分钟内达到接近平衡的条件）。在替代背景下（天然有机材料和盐类）以及在与甲基叔丁基醚（MTBE）竞争的吸附环境中，评估了TCEP吸附的平衡和动力学。与DI相比，天然有机材料（NOM）和盐最多可将最大吸附量降低30％，但在平衡的环境电位浓度下效果可忽略不计。 MTBE使TCEP的吸附能力降低了大约30％至50％。 CD模型代表了在替代水背景井中的扩散，表明添加MTBE会降低扩散过程中TCEP的迁移率。结果表明，沸石β是从水和废水基质中去除TCEP的成功方法，并且可能是治疗其他亲水性持久性EC的有用技术。

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  • 作者

    Grieco, Scott.;

  • 作者单位

    State University of New York College of Environmental Science and Forestry.;

  • 授予单位 State University of New York College of Environmental Science and Forestry.;
  • 学科 Engineering Environmental.;Engineering Chemical.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 206 p.
  • 总页数 206
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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