本文選題：硅藻土 + 分子篩　； 參考：《吉林大學》2015年碩士論文

【摘要】：隨著我國水資源短缺矛盾日益加劇，開發(fā)新型吸附劑對污水、廢水進行處理和回用越發(fā)緊迫。硅藻土在我國儲量十分豐富，并且具有輕質(zhì)、孔容大、化學穩(wěn)定性好、耐酸、耐磨、耐熱等特點，成為一種具有潛在前景的環(huán)境吸附材料。分子篩具有孔徑規(guī)則均勻、結(jié)構(gòu)多樣、極性可調(diào)控、選擇吸附性強、穩(wěn)定性好、容易再生等優(yōu)勢，適用于處理組成復雜、有毒、難降解的低濃度有機廢水。但是硅藻土存在著孔徑過大、吸附效率較低等不足；分子篩也存在著制備成本高昂，難以回收、存在團聚效應(yīng)等缺點。將硅藻土與分子篩復合，制備功能性吸附材料應(yīng)用于污染物處理具有重大的應(yīng)用研究價值。本文主要研究結(jié)果如下： （1）研究了三種硅藻土和十三種分子篩對模擬苯酚廢水的吸附性能。硅藻土對苯酚吸附性能較差，其中硅藻土3#最優(yōu)，去除率為14%。分子篩對苯酚吸附能力隨分子篩種類變化，MFI晶型的ZSM-5系列分子篩附性能較好，其中silicalite-1最優(yōu)，去除率可達82%以上。選擇硅藻土3#和silicalite-1分子篩作為后續(xù)復合材料制備的原材料。并且對硅藻土3#和silicalite-1分子篩進行XRD圖譜和SEM表面形貌分析。 （2）分別采用復配法、原位法、二次法以及微介孔法制備硅藻土-分子篩復合材料，研究了復合材料的XRD圖譜和SEM形貌。結(jié)果表明，復配法、二次法和微介孔法復合材料的XRD圖譜分別包含硅藻土3#和silicalite-1分子篩的特征峰，原位法復合材料XRD圖譜中不存在無定形SiO2特征峰；復配法復合材料SEM顯示，，硅藻土分子篩不均勻結(jié)合，原位法、二次法和微介孔法復合材料SEM顯示，分子篩均在硅藻土3#表面進行生長，其中二次法生長優(yōu)于原位法。 （3）對所制備的復合材料進行吸附時間、吸附劑用量、吸附pH等一系列研究，得出在酸性條件下投加20g/L復合吸附材料，可對50mg/L苯酚有效吸附77%。與硅藻土3#的14%去除率相比，復合材料的吸附能力明顯提升。
[Abstract]:With the increasing shortage of water resources in China, it is more and more urgent to develop new adsorbents to treat and reuse sewage and wastewater.Diatomite is rich in reserves in China, and has the characteristics of light weight, large pore volume, good chemical stability, acid resistance, wear resistance, heat resistance and so on. It has become a potential environmental adsorption material.Molecular sieve has the advantages of regular pore size, diverse structure, adjustable polarity, strong selective adsorption, good stability and easy regeneration. It is suitable for the treatment of low concentration organic wastewater with complex composition, toxic and difficult to degrade.However, diatomite has many disadvantages, such as too large pore size and low adsorption efficiency, and molecular sieve has some disadvantages such as high cost, difficult to recover and agglomeration effect.The preparation of functional adsorption materials by combining diatomite with molecular sieve has great application value in pollutant treatment.The main results of this paper are as follows:The adsorption properties of three kinds of diatomite and thirteen molecular sieves for simulated phenol wastewater were studied.The adsorption performance of diatomite to phenol was poor, among which diatomite was the best and the removal rate was 14%.The adsorption ability of molecular sieve for phenol varies with the type of molecular sieve. The ZSM-5 series molecular sieves with crystal form of MFI have better adsorbability, among which silicalite-1 is the best, and the removal rate is more than 82%.Diatomite and silicalite-1 molecular sieves were selected as raw materials for the subsequent composite materials.The XRD spectra and SEM surface morphology of diatomite and silicalite-1 molecular sieve were analyzed.(2) diatomite molecular sieve composites were prepared by combination method, in-situ method, secondary method and micromesoporous method, respectively. The XRD spectra and SEM morphology of the composites were studied.The results showed that the XRD spectra of composite materials by compounding method, quadratic method and micromesoporous method contained the characteristic peaks of diatomite and silicalite-1 molecular sieve, respectively, and there were no amorphous SiO2 characteristic peaks in XRD atlas of in-situ composite materials, and the SEM spectra of composite materials by compound method showed that,SEM showed that the molecular sieve grew on the surface of diatomite by in-situ method, secondary method and micromesoporous method, and the secondary method was superior to the in-situ method.(3) A series of studies were carried out on the adsorption time, adsorbent dosage and adsorption pH of the prepared composite materials. It was concluded that the 50mg/L phenol could be effectively adsorbed by adding 20g/L composite adsorption materials under acidic conditions.Compared with the 14% removal rate of diatomite, the adsorption capacity of the composite was obviously improved.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X703

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