Fe改性介孔材料SBA-15对饮用水中砷吸附的研究

发布时间：2018-04-21 21:22

  本文选题：介孔材料 + SBA-15　； 参考：《昆明理工大学》2012年硕士论文

【摘要】：随着我国社会经济的快速发展,砷的污染问题已变得日益严重。特别是对水质的污染,已引起了全世界环境工作者的普遍关注。目前我国某些地区地表水体中砷的含量过高,已超过了国家饮用水的标准,对当地居民的健康造成了严重危害。因此,寻找一种对砷去除效率高,操作简便,经济且无二次污染的除砷方法对含砷废水的处理和饮水净化都具有重要意义。 本文对化学法、物化法和微生物法进行了比较。发现,在目前的处理含砷废水中吸附法是应用最广泛的。但目前工业上使用的吸附剂除砷效率普遍较低。因此,研制高效的砷吸附剂是吸附研究的一个重要方向。 本论文对介孔分子筛SBA-15的实验研究主要包括以下两部分内容： (1)比较与筛选Fe改性后的吸附剂SBA-15 首先,分别考察了吸附剂介孔材料SBA-15、介孔吸附剂SBA-15-8%Fe.斜发沸石、辉沸石和介孔氧化铁对As(V)的去除效果,进行对比。发现介孔吸附剂SBA-15-8%Fe对As(V)的吸附效果最好。 然后,对介孔吸附剂SBA-15-8%Fe进行改性。改性后的介孔材料(T-SBA-15-X)对As(V)进行吸附实验。结果发现吸附剂500℃-SBA-15-8%Fe对As(V)的吸附效果最好,性能最优良。 (2)吸附剂500℃-SBA-15-8%Fe对As(V)的吸附研究 研究吸附剂500℃-SBA-15-8%Fe对As(V)的吸附。同时考察溶液的影响因数有pH值、砷溶液的初始浓度、吸附剂用量、吸附时间、吸附温度和共存离子(NO3-、SO42-、 SiO32-、CO32-和PO43-)等。以便更加深入了解500℃-SBA-15-8%Fe对As(V)的吸附规律。 实验结果表明：吸附剂500℃-SBA-15-8%Fe在pH值为6.50时对As(V)的去除效率最高。随着砷溶液的初始浓度的升高,500℃-SBA-15-8%Fe对As(V)的去除效率降低。随着吸附剂500℃-SBA-15-8%Fe用量的增加,砷的吸附效率快速上升。吸附温度越高,500℃-SBA-15-8%Fe对As(V)的吸附速率就越快。但是,吸附温度影响不了其对As(V)的吸附容量；共存离子(CO32-、SiO32-、SO42-、PO43-和NO3-)的存在,均影响了吸附剂500℃-SBA-15-8%Fe对As(V)的吸附效率。影响大小：SiO32-PO43-SO42-NO3-CO32-。 最后,用粉末X射线衍射(XRD)、扫描电子显微镜(SEM)和氮气吸附-脱附技术对材料进行了表征。分析结果表明,Fe已成功负载在了介孔材料SBA-15上并未引起骨架的坍塌,而且改性介孔材料500℃-SBA-15-8%Fe具有良好的介孔孔道结构。因此,可以说明用Fe对介孔材料SBA-15的改性是成功的。
[Abstract]:With the rapid development of social economy in China, arsenic pollution has become more and more serious. In particular, the pollution of water quality has aroused the universal concern of environmental workers all over the world. At present, the content of arsenic in surface water in some areas of China is too high, which has exceeded the national drinking water standard, and has caused serious harm to the health of local residents. Therefore, it is of great significance to find a method of arsenic removal with high removal efficiency, simple operation, economic and no secondary pollution for the treatment of arsenic-containing wastewater and the purification of drinking water. In this paper, chemical method, physicochemical method and microbial method are compared. It is found that the adsorption method is the most widely used in the treatment of arsenic-containing wastewater. However, the removal efficiency of arsenic by adsorbent used in industry is generally low. Therefore, the development of high-efficiency arsenic adsorbent is an important direction of adsorption research. In this thesis, the experimental study of mesoporous molecular sieve SBA-15 consists of the following two parts: Comparison and screening of Fe modified adsorbent SBA-15 First, the mesoporous material SBA-15 and the mesoporous adsorbent SBA-15-8 were investigated respectively. The removal effects of clinoptilolite, zeolites and mesoporous iron oxide on As-V were compared. It was found that the mesoporous adsorbent SBA-15-8 had the best adsorption effect on ASV. Then, the mesoporous adsorbent SBA-15-8 was modified. The modified mesoporous material (T-SBA-15-X) was used to adsorb ASV. The results showed that the adsorbent 500 鈩，

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