养殖水体污染物吸附材料的制备及性能研究

发布时间：2018-01-05 03:05

本文关键词：养殖水体污染物吸附材料的制备及性能研究　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国的凹凸棒石黏土储量丰富,但对凹凸棒石黏土的开发和利用较低。本文基于简单、易行的方法对凹凸棒石黏土和沸石进行改性以研究低成本、环境友好型的对养殖水体中常见的污染物有着优异的去除效果的黏土矿物材料。采用简单的热改性的方法制备热处理富钙凹凸棒石黏土,模拟其对实际废水中磷的去除效果,通过批试验对磷和Ca2+释放动力学和等温线进行研究,探讨凹凸棒石黏土吸附磷的机制,利用氯化钠改性原状沸石,研究最佳改性浓度沸石对水体中氨氮的去除效果,氯化铁改性凹凸棒石黏土制备水合氧化铁负载的凹凸棒石黏土,通过不同的手段表征凹凸棒石黏土的晶体结构和表面的变化以及比较不同浓度的水合氧化铁改性凹凸棒对砷的去除效果。实验结果表明,高温热改性能够改变热处理富钙凹凸棒的吸附性能,增加富钙凹凸棒中钙的含量,形成了氧化钙或其他含钙化合物,提高了富钙凹凸棒的吸附性能;NaCl改性沸石增加了沸石的晶体表面的粗糙度,使得晶束分散更加均匀,改性之后沸石的比表面积和总孔容增加而平均孔径相对缩小,但也要大于NH4+的直径,NaCl改性还疏通了沸石孔道,清除了部分杂质,增加了沸石表面的吸附剂位点,从而增加了沸石的吸附性能;0.6mol/L改性制备的水合氧化铁负载凹凸棒石黏土能够显著增加其对砷的吸附效果,当As5+浓度为50mg/L时,对As5+吸附效率提高了 61.78%,当砷的浓度较低时,改性凹凸棒具有优异的循环再生能力,可以被重复使用。由此可以得出,可以利用简单易行的改性方法制备低成本环境友好型的吸附材料,这些材料可以应用于养殖废水中污染物的吸附和控制并能取得很好的效果。
[Abstract]:Attapulgite clay reserves are abundant in our country, but the development and utilization of attapulgite clay is low. This paper is based on the simple, low cost in order to study the modification of attapulgite clay and zeolite and easy method, environment friendly to the common aquaculture water pollutants have better removal effect of clay mineral materials different. Made by simple thermal modification by heat treatment of calcium rich attapulgite clay, to simulate the removal effect of phosphorus in wastewater, was studied by batch test release kinetics and isotherms of phosphorus and Ca2+, to explore the mechanism of attapulgite clay adsorption, modified zeolite using intact study on modification of sodium chloride, the best concentration of zeolite on removal of ammonia nitrogen in water, ferric chloride modified attapulgite clay preparation of attapulgite clay hydrated iron oxide load, through different methods for the characterization of attapulgite clay crystal The changes of body structure and surface and different concentrations of hydrous ferric oxide modified attapulgite on the removal of arsenic. The experimental results show that the thermal modification of heat treatment can change the adsorption properties of calcium rich attapulgite, increase the content of calcium rich attapulgite calcium, calcium oxide or other calcium compounds formation, improve the adsorption properties of calcium rich attapulgite; NaCl modified zeolite increases the surface roughness of the zeolite crystals, the crystal beam dispersed more evenly, after modification of zeolite surface area and total pore volume and average pore size increase is relatively narrow, but also greater than the diameter of the NH4+, NaCl modified zeolite is also clear remove some impurities, and increase the adsorption sites of zeolite surface, thus increasing the adsorption capacity of zeolite; 0.6mol/L modification preparation of hydrous ferric oxide loaded attapulgite can increase the adsorption effect of arsenic, When the As5+ concentration is 50mg/L, the adsorption of As5+ on the efficiency of 61.78%, when the arsenic concentration was low, the modified attapulgite has excellent recycling ability, can be used repeatedly. It can be concluded that the modified method can use simple and easy preparation of adsorption materials with low cost and environmentally friendly, these materials can be applied to pollutants in aquaculture wastewater by adsorption and control and can achieve good results.

【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X714;TQ424

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