發(fā)布時間：2018-04-21 21:22

  本文選題：介孔材料 + SBA-15�。� 參考：《昆明理工大學(xué)》2012年碩士論文

【摘要】：隨著我國社會經(jīng)濟的快速發(fā)展,砷的污染問題已變得日益嚴(yán)重。特別是對水質(zhì)的污染,已引起了全世界環(huán)境工作者的普遍關(guān)注。目前我國某些地區(qū)地表水體中砷的含量過高,已超過了國家飲用水的標(biāo)準(zhǔn),對當(dāng)?shù)鼐用竦慕】翟斐闪藝?yán)重危害。因此,尋找一種對砷去除效率高,操作簡便,經(jīng)濟且無二次污染的除砷方法對含砷廢水的處理和飲水凈化都具有重要意義。 本文對化學(xué)法、物化法和微生物法進行了比較。發(fā)現(xiàn),在目前的處理含砷廢水中吸附法是應(yīng)用最廣泛的。但目前工業(yè)上使用的吸附劑除砷效率普遍較低。因此,研制高效的砷吸附劑是吸附研究的一個重要方向。 本論文對介孔分子篩SBA-15的實驗研究主要包括以下兩部分內(nèi)容： (1)比較與篩選Fe改性后的吸附劑SBA-15 首先,分別考察了吸附劑介孔材料SBA-15、介孔吸附劑SBA-15-8%Fe.斜發(fā)沸石、輝沸石和介孔氧化鐵對As(V)的去除效果,進行對比。發(fā)現(xiàn)介孔吸附劑SBA-15-8%Fe對As(V)的吸附效果最好。 然后,對介孔吸附劑SBA-15-8%Fe進行改性。改性后的介孔材料(T-SBA-15-X)對As(V)進行吸附實驗。結(jié)果發(fā)現(xiàn)吸附劑500℃-SBA-15-8%Fe對As(V)的吸附效果最好,性能最優(yōu)良。 (2)吸附劑500℃-SBA-15-8%Fe對As(V)的吸附研究 研究吸附劑500℃-SBA-15-8%Fe對As(V)的吸附。同時考察溶液的影響因數(shù)有pH值、砷溶液的初始濃度、吸附劑用量、吸附時間、吸附溫度和共存離子(NO3-、SO42-、 SiO32-、CO32-和PO43-)等。以便更加深入了解500℃-SBA-15-8%Fe對As(V)的吸附規(guī)律。 實驗結(jié)果表明：吸附劑500℃-SBA-15-8%Fe在pH值為6.50時對As(V)的去除效率最高。隨著砷溶液的初始濃度的升高,500℃-SBA-15-8%Fe對As(V)的去除效率降低。隨著吸附劑500℃-SBA-15-8%Fe用量的增加,砷的吸附效率快速上升。吸附溫度越高,500℃-SBA-15-8%Fe對As(V)的吸附速率就越快。但是,吸附溫度影響不了其對As(V)的吸附容量；共存離子(CO32-、SiO32-、SO42-、PO43-和NO3-)的存在,均影響了吸附劑500℃-SBA-15-8%Fe對As(V)的吸附效率。影響大小：SiO32-PO43-SO42-NO3-CO32-。 最后,用粉末X射線衍射(XRD)、掃描電子顯微鏡(SEM)和氮氣吸附-脫附技術(shù)對材料進行了表征。分析結(jié)果表明,Fe已成功負(fù)載在了介孔材料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結(jié)構(gòu)。因此,可以說明用Fe對介孔材料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，

本文編號：1784149