本文關(guān)鍵詞：磁性鎳鋅鐵氧體納米材料的制備及應(yīng)用　出處：《江蘇大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鎳鋅鐵氧體 快速燃燒法 檸檬酸-凝膠法 中性紅 青霉素酰化酶 吸附 固定化

【摘要】：磁性鎳鋅鐵氧體納米材料具有飽和磁化強(qiáng)度高、居里溫度高、化學(xué)穩(wěn)定性好、矯頑力低、比表面積大等很多優(yōu)點(diǎn),是重要的有前景的磁性納米材料之一,可廣泛應(yīng)用于環(huán)境污水處理和生物領(lǐng)域。本文采用快速燃燒法和檸檬酸-凝膠法制備了磁性鎳鋅鐵氧體納米材料,并采用XRD、SEM、TEM、BET和VSM等分析方法對(duì)其進(jìn)行了表征,并研究了鎳鋅鐵氧體在污水處理和生物上的應(yīng)用,其主要結(jié)論如下:1.以無(wú)水乙醇為溶劑,采用快速燃燒法制備了磁性Ni_(0.5)Zn_(0.5)Fe_2O_4納米材料。發(fā)現(xiàn)磁性Ni_(0.5)Zn_(0.5)Fe_2O_4納米材料在10 mL無(wú)水乙醇和400℃條件下即可形成,且無(wú)水乙醇的量是影響Ni_(0.5)Zn_(0.5)Fe_2O_4納米材料性能的關(guān)鍵因素。揭示了無(wú)水乙醇的量對(duì)Ni_(0.5)Zn_(0.5)Fe_2O_4納米材料性能影響規(guī)律:隨著無(wú)水乙醇體積從10 mL到30 mL的增加,在400℃下煅燒2 h得到的磁性Ni_(0.5)Zn_(0.5)Fe_2O_4納米材料的平均顆粒尺寸從14.9nm增加至18.3 nm,飽和磁化強(qiáng)度從27.1 Am2/kg增加至105.2 Am2/kg,比表面積在無(wú)水乙醇的量為15 m L時(shí),達(dá)到最大69.7 m2/g;實(shí)現(xiàn)了磁性鎳鋅鐵氧體納米材料的快速燃燒可控制備。2.采用響應(yīng)面法優(yōu)化了磁性Ni_(0.5)Zn_(0.5)Fe_2O_4/SiO2納米復(fù)合材料吸附中性紅工藝,并研究了其吸附動(dòng)力學(xué)和吸附等溫線。通過響應(yīng)面軟件對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行統(tǒng)計(jì)分析,確定了磁性Ni_(0.5)Zn_(0.5)Fe_2O_4/SiO2納米復(fù)合材料吸附中性紅的優(yōu)化條件:中性紅水溶液pH為5.4,納米復(fù)合材料中SiO2含量為17.3%,納米復(fù)合材料的煅燒溫度為581℃,且優(yōu)化條件下納米復(fù)合材料對(duì)中性紅的最大吸附量高達(dá)39.9 mg/g。同時(shí),基于實(shí)驗(yàn)數(shù)據(jù)的模擬計(jì)算發(fā)現(xiàn),準(zhǔn)二級(jí)動(dòng)力學(xué)模型可以很好的描述磁性Ni_(0.5)Zn_(0.5)Fe_2O_4/SiO2納米復(fù)合材料室溫下吸附中性紅的動(dòng)力學(xué)過程,磁性Ni_(0.5)Zn_(0.5)Fe_2O_4/SiO2納米復(fù)合材料吸附中性紅的等溫線符合Redlich-Peterson模型,揭示了磁性Ni_(0.5)Zn_(0.5)Fe_2O_4/SiO2納米復(fù)合材料表面的多樣性,并根據(jù)模型機(jī)理推斷出磁性Ni_(0.5)Zn_(0.5)Fe_2O_4/SiO2納米復(fù)合材料對(duì)中性紅的吸附為單層和多層的混合吸附模式。3.青霉素�；冈诖判訬i_(0.5)Zn_(0.5)Fe_2O_4@SiO2納米復(fù)合材料上的固定化。采用快速燃燒法成功制備了磁性Ni_(0.5)Zn_(0.5)Fe_2O_4/SiO2納米復(fù)合材料,并采用戊二醛對(duì)磁性Ni_(0.5)Zn_(0.5)Fe_2O_4@SiO2納米復(fù)合材料進(jìn)行表面改性,進(jìn)而在其表面成功固定了青霉素�；�,并探討了固定化青霉素酰化酶和游離青霉素�；冈诓煌琾H和溫度下的活性。經(jīng)比較發(fā)現(xiàn),固定化的青霉素酰化酶的活性受pH和溫度的影響程度比游離青霉素�；复蟠蠼档�,表現(xiàn)出良好的酸堿穩(wěn)定性和熱穩(wěn)定性;固定于磁性納米材料之上的青霉素酰化酶循環(huán)使用12次后,相對(duì)活性依然保持63.5%,表現(xiàn)出良好的固定化酶循環(huán)利用率。
[Abstract]:Magnetic properties of Ni Zn ferrite nano material with high saturation magnetization, high Curie temperature, good chemical stability, low coercivity, high specific surface area and many other advantages, is one of the most promising nano magnetic materials can be widely used in environmental and biological sewage treatment field. This paper adopts the rapid combustion method and citric acid sol-gel method magnetic Ni Zn ferrite nano materials were prepared, and the use of XRD, SEM, TEM, BET and VSM analysis methods were used to characterize them, and study the application of Ni Zn ferrite in wastewater treatment and biological, the main conclusions are as follows: 1. using anhydrous ethanol as solvent, using fast the combustion of magnetic Ni_ was prepared (0.5) Zn_ (0.5) Fe_2O_4 nano material. It is found that the magnetic Ni_ (0.5) Zn_ (0.5) Fe_2O_4 nano materials can be formed in 10 mL ethanol and 400 DEG C, and the amount of ethanol is Ni_ (0.5) Zn_ (0.5) Fe_2O_4 nano materials The key performance factors. Reveals the ethanol amount on Ni_ (0.5) Zn_ (0.5) properties of Fe_2O_4 nano materials with anhydrous ethanol increased from 10 mL to 30 mL, was annealed at 400 2 h the magnetic Ni_ (0.5) Zn_ (0.5) Fe_2O_4 nano materials were flat the particle size increased from 14.9nm to 18.3 NM, the saturation magnetization increased from 27.1 Am2/kg to 105.2 Am2/kg, the specific surface area in the volume of anhydrous alcohol is 15 m L, reached a maximum of 69.7 m2/g; the rapid combustion of magnetic Ni Zn ferrite nano materials can be controlled by surface preparation of.2. was optimized by Ni_ (magnetic response 0.5) Zn_ (0.5) Fe_2O_4/SiO2 nano composite material of neutral red adsorption process, and studied its adsorption kinetics and adsorption isotherm. Through statistical analysis of experimental data the response surface software, determine the magnetic properties of Ni_ (0.5) Zn_ (0.5) Fe_2O_4/ SiO2 nanocomposite adsorption of neutral red The optimal conditions of neutral red pH aqueous solution was 5.4, the content of SiO2 in the composite is 17.3%, calcination temperature of nanocomposites is 581 DEG C, and the optimization of the maximum adsorption capacity of nano composite materials under the condition of neutral red as high as 39.9 mg/g. at the same time, based on the experimental data of simulation calculation found that the quasi two level dynamics the model can describe well the magnetic properties of Ni_ (0.5) Zn_ (0.5) adsorption kinetics of neutral red at room temperature of Fe_2O_4/SiO2 nano composite materials, magnetic properties of Ni_ (0.5) Zn_ (0.5) adsorption isotherms of Fe_2O_4/SiO2 nanocomposites of neutral red with the Redlich-Peterson model, reveals the magnetic properties of Ni_ (0.5) Zn_ (0.5) surface diversity Fe_2O_4/SiO2 nano composite materials, and according to the mechanism model to infer the magnetic properties of Ni_ (0.5) Zn_ (0.5) Fe_2O_4/SiO2 nano composite materials on the adsorption of neutral red as the mixed monolayer and multilayer adsorption model of.3. in penicillin acylase The magnetic Ni_ (0.5) Zn_ (0.5) immobilized on nano Fe_2O_4@SiO2 composite materials. With the rapid combustion of magnetic Ni_ were successfully prepared (0.5) Zn_ (0.5) Fe_2O_4/SiO2 nano composite material, and using glutaraldehyde on magnetic properties of Ni_ (0.5) Zn_ (0.5) surface modified Fe_2O_4@SiO2 nano composite materials, and on the surface of successfully immobilized penicillin acylase, and discusses the activity of immobilized penicillin acylase and free penicillin acylase in different pH and temperature. The results showed that penicillin acylase immobilized activated by pH and temperature influence than free penicillin acylase greatly reduced, showing good pH stability and thermal stability; fixed on magnetic nano materials of penicillin acylase recycled 12 times, the relative activity remained 63.5%, showing good immobilized enzyme recycling rate.

【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM277;TB383.1

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