本文關(guān)鍵詞：多種土壤對(duì)雙酚A的吸附行為及吸附預(yù)測(cè)模型的構(gòu)建　出處：《華中農(nóng)業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 雙酚A 土壤 吸附 統(tǒng)計(jì)分析 FTIR 預(yù)測(cè)模型

【摘要】：吸附解吸是內(nèi)分泌干擾物在土壤環(huán)境中行為和歸宿的兩個(gè)主要過(guò)程。內(nèi)分泌干擾物在土壤中的吸附解吸影響著它在土壤中的遷移、降解和生物利用等過(guò)程。了解內(nèi)分泌干擾物在多種土壤中的吸附解吸行為,并且建立一種快速預(yù)測(cè)不同土壤對(duì)內(nèi)分泌干擾物吸附行為的模型,對(duì)于預(yù)測(cè)和評(píng)價(jià)內(nèi)分泌干擾物對(duì)土壤、地下水存在的潛在危害、開展土壤修復(fù)具有十分重要的意義。本文采用批量平衡吸附法,研究了低濃度內(nèi)分泌干擾物雙酚A(bisphenol A)在七種地帶性土壤和五種非地帶性土壤中的吸附行為,主要考察了吸附動(dòng)力學(xué)、等溫線、熱力學(xué)等特性;探討了環(huán)境因素如:p H、溫度、離子強(qiáng)度等對(duì)土壤吸附雙酚A的影響;結(jié)合SPSS統(tǒng)計(jì)分析軟件研究了土壤的不同性質(zhì)參數(shù)對(duì)吸附行為的影響程度,并通過(guò)多元逐步回歸分析建立了土壤對(duì)雙酚A吸附行為的預(yù)測(cè)模型;運(yùn)用紅外光譜技術(shù),考察了土壤在吸附雙酚A前后官能團(tuán)的變化特征;并初步探討了雙酚A與土壤的結(jié)合機(jī)理。主要研究?jī)?nèi)容和結(jié)果如下:1.研究了雙酚A在供試土壤表面的吸附動(dòng)力學(xué)機(jī)制。雙酚A在土壤中吸附量隨時(shí)間增加而增加,最后趨于穩(wěn)定,吸附分為快吸附和慢吸附兩個(gè)過(guò)程,24 h內(nèi)可達(dá)吸附平衡。吸附動(dòng)力學(xué)用二級(jí)動(dòng)力學(xué)、Elovich方程和拋物線擴(kuò)散方程擬合,結(jié)果表明二級(jí)動(dòng)力學(xué)擬合效果較好,R2均大于0.92。它表明吸附過(guò)程比較復(fù)雜,化學(xué)吸附是速控步驟。2.應(yīng)用吸附-解吸化學(xué)方法和傅里葉變換紅外光譜(FTIR)分析,系統(tǒng)探討了雙酚A在土壤表面的吸附-解吸特征,初步揭示了其吸附機(jī)理。雙酚A在十二種土壤中的等溫吸附方程均可用線性方程和Freundlich方程擬合。采自華中農(nóng)業(yè)大學(xué)水稻田土對(duì)雙酚A的吸附量最大,桃園地土的吸附量最小。吸附系數(shù)最大者是最小者的3.03倍。用Ca Cl2溶液和磷酸緩沖鹽溶液,連續(xù)解吸吸附在土壤表面的雙酚A分子,計(jì)算通過(guò)靜電作用和配位交換作用吸附的雙酚A所占比例。結(jié)果表明靜電作用吸附所占比例為3.4%-11.8%,配位交換作用所占比例為2.9%-13.2%。兩者總共所占比例10.1%-21.9%。說(shuō)明靜電作用和配位交換作用吸附不是土壤吸附雙酚A的主要作用力。FTIR結(jié)果表明,氫鍵作用參與了土壤對(duì)雙酚A的吸附。3.環(huán)境影響因素試驗(yàn)表明,除長(zhǎng)沙紅壤和華中農(nóng)業(yè)大學(xué)茶園地土外,其余土壤在酸性條件下(p H 3-5)吸附量較大,隨著p H增加,吸附量逐漸降低,在p H=6-8左右,吸附量趨于平衡,隨著p H進(jìn)一步增加,吸附量急劇下降,這與土壤表面所帶電荷和雙酚A在不同p H條件下的解離程度有關(guān)。隨著電解質(zhì)Ca Cl2濃度的增加,土壤對(duì)雙酚A的吸附量均呈增加趨勢(shì),表明Ca2+的存在促進(jìn)了土壤對(duì)雙酚A吸附。去有機(jī)質(zhì)之后的土壤與原土比較,去有機(jī)質(zhì)土壤對(duì)雙酚A的吸附量明顯降低,表明有機(jī)質(zhì)含量是影響土壤對(duì)雙酚A吸附的重要因素。除武漢黃棕壤外,其余土壤對(duì)雙酚A的吸附量均隨溫度增加而降低,表明溫度升高不利于吸附反應(yīng)的進(jìn)行。4.吸附熱力學(xué)實(shí)驗(yàn)表明,雙酚A在土壤表面的吸附自由能(△G)為負(fù)值,表明吸附為自發(fā)過(guò)程,且△G的絕對(duì)值均小于40 k J/mol,說(shuō)明主要發(fā)生物理吸附;吸附焓變值△H(除武漢黃棕壤)小于零,說(shuō)明吸附是放熱反應(yīng),這與溫度變化對(duì)吸附的影響一致;吸附的熵變值△S均小于零,說(shuō)明吸附過(guò)程是一個(gè)熵減小的過(guò)程。雙酚A在土壤中的吸附主要是一個(gè)自發(fā)、放熱、熵減小的物理吸附過(guò)程。5.運(yùn)用SPSS統(tǒng)計(jì)分析軟件研究了土壤各種性質(zhì)參數(shù)對(duì)雙酚A吸附的影響程度。簡(jiǎn)單相關(guān)分析得出,土壤對(duì)雙酚A吸附能力與土壤有機(jī)質(zhì)含量(SOM)高度相關(guān),與陽(yáng)離子交換量(CEC)中度相關(guān),與p H和粘粒含量弱相關(guān),與電導(dǎo)率(EC)和比表面積(SSA)幾乎不相關(guān)。偏回歸分析表明,土壤有機(jī)質(zhì)是影響雙酚A吸附的最主要因素,這與一元線性回歸結(jié)果一致。多元逐步回歸分析結(jié)果顯示,有機(jī)質(zhì)含量是主導(dǎo)土壤對(duì)雙酚A吸附的關(guān)鍵因素,隨著土壤有機(jī)質(zhì)含量增加,其吸附能力增強(qiáng)。并通過(guò)多元逐步回歸分析建立了土壤對(duì)雙酚A吸附行為預(yù)測(cè)模型,揭示了雙酚A在不同土壤中的吸附系數(shù)與SOM間存在的定量關(guān)系,具有較強(qiáng)的理論指導(dǎo)意義。
[Abstract]:Adsorption and desorption are the two main processes of endocrine disruptors behavior in the soil environment and the destination. The adsorption and desorption of endocrine disrupting chemicals in soils affects its migration in soil, degradation and biological processes. Understanding of endocrine disruptors in a variety of soil adsorption desorption behavior, and establish a rapid prediction model of soil the adsorption behaviors of endocrine disruptors, for the prediction and evaluation of endocrine disruptors on Soil and groundwater potential hazards exist, has very important significance to carry out soil remediation. In this paper, using batch equilibrium adsorption method of low concentration of bisphenol A (bisphenol A) in seven soil and five non zonal soil the adsorption behavior of the main effects of adsorption isotherms, kinetics, thermodynamics and other characteristics; discusses the environmental factors such as: P H, temperature, ionic strength and so on The effect of soil adsorption of bisphenol A; the influence degree of different parameters with SPSS statistical analysis software to study the soil adsorption behavior, and through multivariate analysis established a prediction model of soil on the adsorption behavior of bisphenol A by using stepwise regression; infrared spectroscopy, investigated the changes in soil characteristics before and after adsorption of bisphenol A and functional groups; preliminary study on the binding mechanism of bisphenol A and soil. The main research contents and results are as follows: 1. research on bisphenol A in the tested soil surface. The adsorption kinetics mechanism of adsorption increased with time of bisphenol A in the soil, and finally tends to be stable, the adsorption is fast adsorption and slow adsorption process of two, 24 h up to grade two. The adsorption equilibrium of kinetics of adsorption kinetics, the Elovich equation and parabolic diffusion equation, results show that the better the two level dynamic fitting effect of R2 was greater than 0.92., it shows that the adsorption. The process is more complex, the chemical adsorption is the rate controlling step of.2. adsorption desorption chemical method and application of Fu Liye transform infrared spectroscopy (FTIR) analysis system, discusses the characteristics of adsorption desorption of bisphenol A in surface soils, reveal the mechanism of adsorption of bisphenol A in twelve kinds of soil. The isothermal adsorption equation of linear equations can and the Freundlich equation. The maximum adsorption capacity of paddy mining from Huazhong Agricultural University soil of bisphenol A, the adsorption capacity of Taoyuan land is the smallest. The maximum adsorption coefficient is 3.03 times the minimum. With the Ca Cl2 solution and phosphate buffer salt solution, adsorption of bisphenol A in continuous solution molecular soil surface, calculated by the electrostatic interaction bisphenol A and ligand exchange interaction adsorption proportion. The results show that the electrostatic adsorption of the proportion of 3.4%-11.8%, the ligand exchange accounted for the proportion of total 2.9%-13.2%. of the two 10.1%-21.9%. The main force of.FTIR electrostatic interactions and ligand exchange adsorption is not soil adsorption of bisphenol A results show that the hydrogen bonding in the experiment soil.3. environmental impact factors on the adsorption of bisphenol A, in addition to Changsha red and Huazhong Agricultural University tea garden soil, the soil under acidic conditions (P H 3-5) larger adsorption amount. With P H increased, adsorption capacity gradually decreased, in P H=6-8, adsorption equilibrium, with the P H further increased, adsorption capacity decreased sharply, and the soil surface charge and bisphenol A in different P under the condition of H from solution degree. With the increase of electrolyte Ca concentration of Cl2, the adsorption capacity of soil to bisphenol A increased, showed that Ca2+ promoted the adsorption of bisphenol A to soil organic matter. After compared with the original soil, soil organic matter to the adsorption of bisphenol A was significantly reduced, showed that the content of organic matter The amount of soil is an important factor affecting the adsorption of bisphenol A. In addition to Wuhan yellow brown soil, the adsorption capacity of bisphenol A on the rest of the soil were decrease with the increasing temperature, that temperature is not conducive to the adsorption reaction of.4. adsorption experiments showed that the adsorption of bisphenol A in soil surface free energy (G). That shows that the adsorption is a spontaneous process, and the absolute value of G was less than 40 K J/mol, the main physical adsorption; adsorption enthalpy value Delta H (except Wuhan yellow brown soil) is less than zero, indicating that the adsorption is an exothermic reaction, and the effect of temperature on the adsorption; variable Delta S is less than zero adsorption the entropy, which means that the adsorption process is a process of entropy decrease. The adsorption of bisphenol A in soil is a spontaneous, exothermic, entropy decreases the physical adsorption process of.5. using SPSS statistical analysis software to study the influence of various parameters on the soil properties of bisphenol A adsorption process . simple correlation analysis showed that the soil adsorption capacity of bisphenol A and the content of soil organic matter (SOM) are highly correlated, and cation exchange capacity (CEC) and P H are moderate, and the content of clay weak correlation, and electrical conductivity (EC) and specific surface area (SSA) almost no correlation. Partial regression analysis showed that soil organic matter is the main factor affecting the adsorption of bisphenol A, and the linear regression results. Multiple stepwise regression analysis showed that the content of organic matter is a key factor leading to soil adsorption of bisphenol A, with the increase of soil organic matter content, enhanced its adsorption capacity. And through multivariate analysis was established on the soil the adsorption behavior of bisphenol A prediction model of stepwise regression, reveals the existence of the quantitative relationship between adsorption coefficient and SOM bisphenol A in different soils, has a strong theoretical significance.

【學(xué)位授予單位】：華中農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X53

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

1 胡玲;高乃云;;Fenton試劑降解內(nèi)分泌干擾物雙酚A的研究[J];中國(guó)給水排水;2011年07期

2 蔣俊;李秀艷;;環(huán)境內(nèi)分泌干擾物雙酚A的降解研究進(jìn)展[J];上海化工;2009年04期

3 張黎;譚貴良;堵國(guó)成;陳堅(jiān);劉和;;五氯苯酚厭氧生物降解及降解體系中細(xì)菌種群結(jié)構(gòu)分析[J];微生物學(xué)通報(bào);2008年08期

4 魯佳銘;王欣澤;沈劍;孔海南;;兩種土壤對(duì)內(nèi)分泌干擾物雙酚A和類固醇的吸附性能[J];凈水技術(shù);2011年01期

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