本文選題：磁性氧化石墨-殼聚糖 + 染料��； 參考：《哈爾濱工業(yè)大學》2015年碩士論文

【摘要】：隨著國民經濟的發(fā)展,水環(huán)境問題逐漸引起普遍關注。印染廢水中含有大量有毒有機污染物、酸堿物質等,成分復雜,性質穩(wěn)定,可生化性差,阻礙了水環(huán)境的正常修復,亟待解決。吸附技術是工業(yè)廢水處理的傳統(tǒng)方法,其中傳統(tǒng)吸附劑具有吸附量低、不易分離、二次污染等缺點,新型吸附劑的研發(fā)制備為污水處理工藝的進步提供了新的思路。近年來,新型吸附劑石墨烯基復合材料興起,其富有比表面積大、吸附能力強等特性。本研究制備了易于分離、吸附性能良好的磁性氧化石墨-殼聚糖復合材料(Magnetic Chitosan-Graphene Oxide,MCGO),并分別對酸性染料和堿性染料進行吸附實驗,考查其吸附性能及適用條件。在氨基基團與羧基基團的偶聯(lián)作用下,磁性殼聚糖(Magnetic Chitosan,MCS)呈團聚狀無序負載至氧化石墨(Graphene Oxide;GO)表面,合成MCGO復合材料,表面官能團豐富,熱穩(wěn)定性強,附著Fe3O4磁性粒子,磁飽和強度較大,可實現(xiàn)快速分離。MCGO對酸性染料甲基藍(Methyl Blue,MB)的飽和吸附量為66.43 mg/g,吸附飽和時間為30 h,分階段進行,符合偽二級動力學模型,符合Langmuir等溫吸附模型,為單分子吸附過程。吸附酸性染料過程為放熱反應,在酸性條件與低溫條件下有較高吸附量。吸附行為是靜電吸引作用與范德華力共同作用的結果。以Na OH溶液為脫附劑,溶劑法再生MCGO,循環(huán)再生5次后依舊可達原有吸附量的80%。MCGO對堿性染料亞甲基藍(Methylene Blue,MBL)的飽和吸附量為104.5 mg/g,吸附平衡時間4 h,分階段進行,符合偽二級動力學模型,符合Langmuir等溫吸附模型,材料表面官能團分布均勻。吸附過程由表面擴散和顆粒內部擴散兩方面決定。吸附堿性染料為吸熱反應,堿性條件與高溫條件可促進吸附反應。吸附機理與MCGO吸附酸性染料類似,以靜電吸引作用與范德華力為主。以HCl溶液為脫附劑,溶劑法再生MCGO,5次循環(huán)周期后,吸附量為原始的70%。從吸附容量、吸附速率角度講,MCGO吸附堿性染料的效果更優(yōu),但MCGO吸附酸性染料的重復利用性更強。MCGO吸附不同種類染料有各自的適用條件,具有廣泛的適用性,且操作方便,在實際印染廢水的處理應用中具有巨大的潛力。
[Abstract]:With the development of national economy, the problem of water environment has been paid more and more attention. Printing and dyeing wastewater contains a large number of toxic organic pollutants, acid and alkali substances, complex components, stable properties, poor biodegradability, hinders the normal restoration of the water environment, and needs to be solved. Adsorption technology is the traditional method of industrial wastewater treatment, among which the traditional adsorbent has the disadvantages of low adsorption capacity, difficult to separate, secondary pollution and so on. The development and preparation of new adsorbent provides a new way of thinking for the progress of wastewater treatment technology. In recent years, new adsorbent graphene matrix composites have emerged, which have large specific surface area and strong adsorption ability. In this study, magnetic Chitosan-Graphene oxide / chitosan composite material, which is easy to separate and has good adsorption performance, was prepared. The adsorption experiments of acid dyes and basic dyes were carried out, and their adsorption properties and suitable conditions were investigated. Under the coupling action of amino group and carboxyl group, the magnetic chitosan loaded with magnetic Chitosanine onto the surface of Graphene oxide oxide (MCGO) was synthesized. The surface of the composite is rich in functional groups, strong in thermal stability and attached to the Fe3O4 magnetic particles. The magnetic saturation intensity is high, and the saturation adsorption capacity of acid dye methyl blue blue blue MBB is 66.43 mg / g, and the adsorption saturation time is 30 h, which is in accordance with pseudo-second-order kinetic model and Langmuir isothermal adsorption model, and the adsorption capacity is 66.43 mg / g, and the saturation time is 30 h, which is consistent with the pseudo-second-order kinetic model and the Langmuir isothermal adsorption model. It is a monolayer adsorption process. The process of adsorption of acid dyes is exothermic reaction with high adsorption capacity under acidic and low temperature conditions. The adsorption behavior is the result of the interaction of electrostatic attraction and van der Waals force. Using NaOH solution as desorption agent, the solvent method was used to regenerate MCGO.The saturated adsorption capacity of 80%.MCGO, which could still reach the original adsorption capacity, was 104.5 mg / g, and the adsorption equilibrium time was 4 h, and the adsorption equilibrium time was 4 h. It accords with pseudo-second-order kinetic model and Langmuir isotherm adsorption model, and the functional groups on the surface of the material are uniformly distributed. The adsorption process is determined by both surface diffusion and internal particle diffusion. The adsorption of basic dyes is an endothermic reaction, and the conditions of alkali and high temperature can promote the adsorption reaction. The adsorption mechanism is similar to the adsorption of acid dyes by MCGO with electrostatic attraction and van der Waals force. When HCl solution was used as desorption agent, the adsorption capacity was 70% after 5 cycles of solvent regeneration. From the point of view of adsorption capacity and adsorption rate, the adsorption efficiency of basic dyes is better, but the reutilization of MCGO adsorbed acid dyes is stronger. MCGO has its own suitable conditions for adsorption of different kinds of dyes, which has wide applicability and convenient operation. It has great potential in the treatment and application of printing and dyeing wastewater.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X791

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