本文關(guān)鍵詞： 硅藻土 分子篩 微介孔復(fù)合吸附材料　出處：《吉林大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：在環(huán)境問題日益突出的今天,環(huán)境保護(hù)成為當(dāng)今社會(huì)的主題。我國的缺水問題嚴(yán)重,廢水回用成為人們的共識(shí)。分子篩晶體結(jié)構(gòu)規(guī)范有序、孔道分布豐富均勻、表面性質(zhì)可根據(jù)研究與應(yīng)用需要設(shè)計(jì)調(diào)節(jié),且其對(duì)多種物質(zhì)有良好吸附作用,在水處理領(lǐng)域,有著巨大潛在的應(yīng)用價(jià)值。硅藻土作為一種多孔材料表面結(jié)構(gòu)獨(dú)特,吸附性能良好,具備孔容量大、物理化學(xué)穩(wěn)定性好等優(yōu)勢,資源豐富,價(jià)格便宜,已經(jīng)作為吸附劑應(yīng)用于各種工業(yè)廢水處理過程中。但是硅藻土存在孔徑過大、吸附效率不高等缺點(diǎn);分子篩易團(tuán)聚、成本高、難回收。因此,將分子篩與硅藻土復(fù)合,制備微介孔功能性吸附材料應(yīng)用于水處理領(lǐng)域,具有重大研究與應(yīng)用價(jià)值。本論文主要研究結(jié)果如下:(1)分別采用前處理法(在改性前驅(qū)體液中添加致孔劑CTAB(十六烷基三甲基溴化銨))與后處理法(用NaOH溶液堿浴刻蝕)在硅藻土-分子篩復(fù)合吸附材料中引入微介孔,研究并對(duì)比了所得微介孔復(fù)合吸附材料的吸附性能。結(jié)果表明,前處理法制備的微介孔硅藻土-分子篩復(fù)合吸附材料(配置前驅(qū)體液時(shí)n(CTAB(十六烷基三甲基溴化銨)):n(TEOS(正硅酸乙酯))=0.20)大孔-介孔-微孔數(shù)量比例合理、分布均勻,為最優(yōu)化方法。豐富的多層次多級(jí)孔道充分物理吸附模型有機(jī)污染物分子,對(duì)酚類模型有機(jī)污染物(苯酚)有非常好的吸附效果。(2)使用最優(yōu)化方法制備的微介孔硅藻土-分子篩復(fù)合吸附材料進(jìn)行酚類模型有機(jī)污染物吸附實(shí)驗(yàn),并對(duì)吸附條件與吸附效果進(jìn)行一系列分析。結(jié)果表明,pH為在6-7(對(duì)于實(shí)際應(yīng)用最為合理)時(shí),溶液中酚類模型有機(jī)污染物主要呈分子形態(tài),有利于具有豐富多級(jí)孔道結(jié)構(gòu)的優(yōu)選微介孔硅藻土-分子篩復(fù)合吸附材料對(duì)其進(jìn)行吸附,且吸附效果非常顯著,對(duì)酚類模型有機(jī)污染物(苯酚、鄰苯二酚、間苯二酚、對(duì)苯二酚)的去除率均在90%以上。(3)研究將微介孔硅藻土-分子篩復(fù)合吸附材料與電化學(xué)方法組合在一起構(gòu)成空氣吹脫法-電化學(xué)氧化法-優(yōu)選微介孔硅藻土-分子篩復(fù)合吸附材料吸附法組合工藝,應(yīng)用于廢水處理中。結(jié)果表明,在空氣流速為140ml/min,吹脫溫度為55℃,電流密度為30mA/cm2,吸附材料為優(yōu)選硅藻土-分子篩復(fù)合吸附材料吸附時(shí),此組合工藝對(duì)酚類模型有機(jī)污染物有最好的去除效果,在98%以上,要優(yōu)于單純使用優(yōu)選微介孔硅藻土-分子篩復(fù)合吸附材料進(jìn)行吸附的吸附效果。
[Abstract]:Nowadays, environmental protection has become the main theme of our society. The water shortage is serious in our country, and the reuse of wastewater has become a common understanding. The crystal structure of molecular sieve is orderly and the pore distribution is rich and uniform. The surface properties can be designed and adjusted according to the needs of research and application, and it has good adsorption to many substances, which has great potential application value in the field of water treatment. As a porous material, diatomite has a unique surface structure. It has many advantages such as good adsorption property, large pore capacity, good physical and chemical stability, abundant resources and low price. It has been used as adsorbent in various industrial wastewater treatment processes, but diatomite has too large pore size. The adsorption efficiency is not high, the molecular sieve is easy to agglomerate, the cost is high, the recovery is difficult. Therefore, the molecular sieve and diatomite are combined to prepare the micromesoporous functional adsorption material in the field of water treatment. The main results of this thesis are as follows: (1) the pretreatment method (adding the pore-causing agent CTAB (cetyltrimethylammonium bromide) in the modified precursor solution) and the post-treatment method (using NaOH solution in alkali bath) are adopted. Etching) introduction of micromesoporous pores into diatomite-molecular sieve composite adsorption materials, The adsorption properties of the micromesoporous composite adsorption materials were studied and compared. The micromesoporous diatomite-molecular sieve composite adsorbents prepared by the pretreatment method (when the precursor body fluid is configured, the ratio of macropore to mesoporous micropore is reasonable, the distribution is even, the proportion of macroporous, mesoporous and microporous is reasonable, the proportion of macroporous, mesoporous and microporous is reasonable, the distribution is even, the proportion of macroporous, mesoporous and microporous is reasonable, Rich multilevel and multilevel pore full physical adsorption model for organic pollutant molecules, The adsorption of phenolic model organic pollutants (Phenol) was studied by using the micromesoporous diatomite-molecular sieve composite adsorbed materials prepared by optimization method. A series of analysis was made on adsorption conditions and adsorption effects. The results showed that when pH was 6-7 (the most reasonable for practical application), the phenolic model organic pollutants in the solution were mainly in molecular form. It is favorable for the adsorption of micromesoporous diatomite and molecular sieve composite materials with rich multilevel pore structure, and the adsorption effect is very remarkable, for phenolic model organic pollutants (phenol, catechol, resorcinol, resorcinol, resorcinol, catechol, resorcinol). The removal efficiency of hydroquinone is above 90%. 3) study on the combination of micromesoporous diatomite and molecular sieve composite adsorption materials with electrochemical methods to form air blowing desorption-electrochemical oxidation method-selective micromesoporous diatomite-fractionation. Composite adsorption material adsorption process for sub-sieve, The results show that when the air flow rate is 140 ml / min, the blowing temperature is 55 鈩，

本文編號(hào)：1509791