本文關(guān)鍵詞：礦物負(fù)載型鐵基納米環(huán)境材料的制備及吸附降解機(jī)理研究　出處：《中國(guó)科學(xué)技術(shù)大學(xué)》2017年博士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 蒙脫石 高嶺石 納米零價(jià)鐵 納米鐵氧化物 吸附 光催化

【摘要】：作為環(huán)境水體中非常重要的兩類(lèi)污染物,重金屬和有機(jī)污染物的吸附和降解技術(shù)已引起人們的關(guān)注。納米零價(jià)鐵和納米鐵氧化物在環(huán)境修復(fù)領(lǐng)域有廣泛的應(yīng)用,但其修復(fù)效果取決于材料性能的好壞。本論文利用礦物載體作為穩(wěn)定劑,制備得到蒙脫石基和高嶺石基礦物負(fù)載型納米零價(jià)鐵、蒙脫石負(fù)載型納米鐵氧化物、石墨烯改進(jìn)型蒙脫石負(fù)載型納米鐵氧化物復(fù)合材料。對(duì)其進(jìn)行了水中重金屬的吸附試驗(yàn)和有機(jī)污染物光催化降解試驗(yàn)。主要取得如下結(jié)果:(1)通過(guò)粉煤灰淋濾實(shí)驗(yàn)和遷移模擬實(shí)驗(yàn),揭示了粉煤灰堆周邊滲流場(chǎng)中元素的遷移規(guī)律,分析地下水中As、Cd、Cr、Cu、Pb、Ni、Zn污染產(chǎn)生的原因和影響因素,并劃分重點(diǎn)監(jiān)測(cè)元素Al,As,B,Ba,Cd,Co,Cr,Cu,Fe,Mg,Mn,V,Pb,Sb,Ni和Zn類(lèi)型。(2)以蒙脫石、高嶺石為負(fù)載基質(zhì),采用硼氫化鈉化學(xué)液相還原法制備出一系列礦物負(fù)載型納米零價(jià)鐵,有效解決納米零價(jià)鐵的團(tuán)聚問(wèn)題,減緩納米零價(jià)鐵的氧化。通過(guò)不同的表征手段,揭示了材料的物理化學(xué)特征,探討了材料質(zhì)量與制備條件的相關(guān)性,研究了材料的吸附效果和再生性,闡明了材料的吸附機(jī)理。(3)利用硼氫化鈉化學(xué)液相還原聯(lián)合水熱法的方式設(shè)計(jì)合成了蒙脫石/石墨烯負(fù)載型鐵氧化物納米復(fù)合材料。揭示了對(duì)可見(jiàn)光有反應(yīng)的便宜無(wú)毒的鐵氧化物納米光催化劑、磁力活性成分、蒙脫石負(fù)載的具有防團(tuán)聚性能的納米結(jié)構(gòu)和石墨烯增強(qiáng)的空穴電子對(duì)分離效率的協(xié)同作用機(jī)理。(4)研究了礦物負(fù)載型納米零價(jià)鐵對(duì)水中重金屬離子Cu(Ⅱ),Ni(Ⅱ),Zn(Ⅱ),Pb(Ⅱ)的去除效果、過(guò)程和機(jī)制;探究了礦物負(fù)載型納米鐵氧化物對(duì)水中有機(jī)物質(zhì)的光催化效果、過(guò)程和機(jī)制,建立了復(fù)雜水質(zhì)條件下鐵基納米材料環(huán)境應(yīng)用的概念體系。
[Abstract]:As the two important pollutants in environmental water, adsorption and degradation technology of heavy metals and organic pollutants has aroused people's concern. Nano zero valent iron and iron oxide nanoparticles have been widely used in the field of environmental repair, but the repair effect depends on the material properties of good or bad. This thesis use mineral carrier as stabilizer system prepared by montmorillonite and kaolinite based mineral supported nano zero valent iron, montmorillonite supported nano iron oxide, graphene modified montmorillonite supported nano iron oxide composite material. The adsorption and photocatalytic degradation of organic pollutants in water on the test of heavy metals. The main results are as follows: (1) by Powder Ash Leaching Experiment and migration experiments, reveals the migration regularity of fly ash pile seepage field around the elements in the analysis of underground water, As, Cd, Cr, Cu, Pb, Ni, Zn pollution causes Because of factors and influence, and the division of key monitoring elements Al, As, B, Ba, Cd, Co, Cr, Cu, Fe, Mg, Mn, V, Pb, Sb, Ni and Zn types. (2) on montmorillonite, kaolinite as the load matrix, using sodium borohydride was prepared by a chemical liquid mineral series supported nano zero valent iron reduction, effectively solve the problem of agglomeration of nano zero valent iron, slow oxidation of nano zero valent iron. Characterized by different means, reveals the physical and chemical characteristics of materials, discusses the relationship between the quality of material and the preparation conditions for the study of material adsorption and regeneration effect and clarify the adsorption mechanism of the material. (3) combined with hydrothermal method using sodium borohydride chemical liquid phase reduction mode design and synthesis of montmorillonite / graphene supported iron oxide nano composite materials. Revealed that respond to visible light cheap non-toxic iron oxide nano magnetic photocatalyst supported on montmorillonite with active ingredients There is synergistic effect mechanism of electron hole graphene nanostructures and anti agglomeration performance enhancement of separation efficiency. (4) studied the mineral supported nano zero valent iron on heavy metal ions Cu (II), Ni (II), Zn (II), Pb (II) removal process and mechanism study; minerals supported nano iron oxide photocatalytic effect of organic substances in water, process and mechanism, establish the concept system of water under the condition of complex iron base nano material application in the environment.

【學(xué)位授予單位】：中國(guó)科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：X703
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本文編號(hào)：1411901