發(fā)布時(shí)間：2018-05-02 17:32

  本文選題：土壤 + 苯并三唑��； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：溶解性有機(jī)質(zhì)(DOM)普遍存在于水土環(huán)境中,研究表明,其對(duì)重金屬和有機(jī)污染物的吸附均有顯著影響。但是,目前關(guān)于DOM對(duì)新興極性有機(jī)污染物苯并三唑(BTA)吸附的影響機(jī)理還不清楚。因此本研究采用批實(shí)驗(yàn)的方法,選取華北平原土壤(GSS13)和珠江三角洲土壤(GSS16)為吸附劑,以腐殖酸(HA)和單寧酸(TA)為DOM的典型代表,研究了GSS13土壤對(duì)BTA的吸附特征以及兩種土壤對(duì)DOM的吸附。在此基礎(chǔ)上,研究了HA和TA對(duì)土壤吸附BTA的影響。主要得出以下結(jié)論:(1)土壤對(duì)BTA的吸附過程可劃分為初始快速吸附階段和隨后緩慢吸附階段。溶液初始p H值在4.5-10.5范圍內(nèi)時(shí),其變化對(duì)BTA的吸附無明顯影響,濃度為0.01-0.05 M的Ca2+可與BTA之間發(fā)生絡(luò)合作用而促進(jìn)吸附,而同濃度的Na+對(duì)BTA吸附的影響不明顯。(2)土壤對(duì)DOM的吸附機(jī)理包括靜電作用和配體交換等。當(dāng)背景溶液電解質(zhì)為Na Cl時(shí),GSS13土壤對(duì)HA和TA的吸附要強(qiáng)于Na2SO4背景溶液中的吸附,主要是由于SO42-與帶負(fù)電的DOM競(jìng)爭土壤上帶正電吸附點(diǎn)位的能力強(qiáng)于Cl-。土壤中金屬氧化物表面上的羥基與DOM中羧基等官能團(tuán)之間的配體交換是DOM吸附到土壤上的一個(gè)主要機(jī)制,由于TA中的羧基官能團(tuán)數(shù)量多于HA,土壤對(duì)TA的吸附要強(qiáng)于對(duì)HA的吸附。(3)DOM對(duì)土壤吸附BTA有一定的促進(jìn)作用,隨著加入DOM濃度的增大,土壤吸附BTA的能力增強(qiáng)。DOM促進(jìn)BTA吸附的主要機(jī)理是氫鍵作用,這種極性作用使得BTA吸附的非線性程度增加。但是平衡溶液p H值的變化會(huì)影響DOM上羧基等官能團(tuán)的去質(zhì)子化作用,從而影響DOM對(duì)土壤吸附BTA的促進(jìn)作用。
[Abstract]:Dissolved organic matter (DOM) is widely found in soil and water environment. The results show that it has a significant effect on the adsorption of heavy metals and organic pollutants. However, the effect of DOM on the adsorption of benzotriazole is not clear. Therefore, in this study, batch experiments were used to select GSS13) from North China Plain and GSS16 from the Pearl River Delta as adsorbents, and HA and TAA) as typical representatives of DOM. The adsorption characteristics of BTA on GSS13 soil and the adsorption of DOM on two soils were studied. On this basis, the effects of HA and TA on soil adsorption of BTA were studied. The main conclusions are as follows: (1) the adsorption process of BTA on soil can be divided into the initial fast adsorption stage and the later slow adsorption stage. When the initial pH value of the solution was within the range of 4.5-10.5, the change of pH value had no significant effect on the adsorption of BTA, and the concentration of 0.01-0.05M of Ca2 could promote the adsorption by complexing with BTA. However, the effect of Na on BTA adsorption was not obvious. 2) the adsorption mechanism of DOM on soil included electrostatic interaction and ligand exchange. When the electrolyte of the background solution is NaCl, the adsorption of HA and TA in GSS13 soil is stronger than that in the background solution of Na2SO4, mainly because the ability of SO42- to compete with negatively charged DOM on the soil with positive adsorption point is stronger than that of Cl-. The ligand exchange between hydroxyl groups on the surface of metal oxides and carboxyl groups in DOM is one of the main mechanisms of DOM adsorption on soil. The main mechanism of enhancing the ability of soil to adsorb BTA. Dom promoted the adsorption of BTA was hydrogen bonding. This polarity increased the degree of nonlinearity of BTA adsorption. However, the change of pH value of equilibrium solution will affect the deprotonation of carboxyl and other functional groups on DOM, thus affecting the promotion of BTA adsorption by DOM.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X131.3

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