改性介孔二氧化钛的制备及其在环境污染治理中的应用

发布时间：2018-06-26 04:53

  本文选题：水热法 + 介孔TiO2　； 参考：《大连工业大学》2015年硕士论文

【摘要】：随着环境污染的日益加剧,提高治理污染的手段变得尤为重要。有机污染及重金属污染是当前水环境污染治理中极其需要解决的两大难题。纳米介孔TiO2材料具有比表面积大、无毒、无害、无二次污染等特点,对二氧化钛基纳米材料进行改性并进行相关光催化及重金属吸附性能考察是近年来水处理催化领域的重点研究方向之一。本论文重点研究如下内容:1、以TBOT为钛源,P123为模板剂,通过水热法制备了介孔TiO2样品。利用XRD、TEM、N2吸附-脱附及BET分析、FT-IR分析、热重-失重分析等手段探讨了不同合成条件对样品晶型、性质、形貌、光催化性能的影响,并确定最佳合成条件:A液中乙醇添加量为60mL,P123添加量为2g,水热温度60℃,pH=4,煅烧温度为500℃。最佳制备条件下样品介孔TiO2样品为锐钛矿相,平均粒径在10nm左右,具有不规则、蠕虫状介孔结构,在模拟太阳光下对10mg/L甲基橙溶液光反应120min后,染料降解率为73.0%。2、利用浸渍法制备了双硫腙掺杂的介孔TiO2样品,探讨了不同合成条件对样品性质、形貌、光催化、重金属Cd吸附性能等的影响,确定了样品吸附重金属溶液Cd的最佳制备条件:pH=5、水浴温度60℃、双硫腙与介孔TiO2质量比为0.1。最佳制备条件下双硫腙掺杂的介孔TiO2样品粒径较均匀,粒径在20nm左右,掺杂双硫腙介孔TiO2样品的最佳Cd吸附效果达到98.3%,而介孔TiO2仅为18.2%。在模拟太阳光下对10mg/L甲基橙溶液光反应120min后,最佳染料降解率为91.3%,相对纯介孔二氧化钛样品的73.0%降解率有了显著提高。说明掺杂样品的吸附性能、光催化性能均比较理想。
[Abstract]:As environmental pollution intensifies day by day, it becomes more and more important to improve the means of pollution control. Organic pollution and heavy metal pollution are the two most difficult problems in water pollution control. Nanometer mesoporous TiO2 materials have the characteristics of large specific surface area, non-toxic, harmless, no secondary pollution and so on. In recent years, it is one of the important research directions in the field of water treatment catalysis to modify titanium-based nanomaterials and investigate their photocatalytic and heavy metal adsorption properties. In this thesis, the mesoporous TiO2 samples were prepared by hydrothermal method with Tbot as the templating agent. The effects of different synthesis conditions on the crystal form, properties, morphology and photocatalytic properties of the samples were investigated by means of XRDX TEMN 2 adsorption desorption, BET FT-IR analysis and thermogravimetric analysis. The optimum synthesis conditions were determined as follows: the amount of ethanol added in the solution of: a was 60 mL / L P123 was 2 g, the hydrothermal temperature was 60 鈩，

本文编号：2069188