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钛层柱粘土的合成、改性及其在环境保护中的应用
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摘要
本文研究了利用钛酸四异丙酯在不同的水解体系下制备钛溶胶插层剂,包括盐酸水解体系、乙酸水解体系;利用钛插层剂插层钠基蒙脱土的方法制备了不同的钛层柱粘土,考察了不同的制备条件对钛层柱粘土结构的影响,如反应温度、陈化时间、煅烧温度等;在本研究中,首次报道了乙酸改性钛酸四异丙酯水解制备钛溶胶的方法合成钛层柱粘土。并利用XRD、FT-IR、TEM和液氮吸附—脱附等现代测试手段对钛层柱粘土的结构进行了表征。
     利用离子掺杂技术制备了铁改性钛层柱粘土。以湿式催化过氧化物氧化模拟苯酚废水为研究对象,考察了铁钛层柱粘土催化降解有机废水的性能。同时得到了湿式催化氧化降解苯酚废水的最佳工艺条件。
     利用十六烷基三甲基溴化铵有机改性钛层柱粘土,提高了其吸附有机物的能力。以甲基橙脱色为研究对象,考察了有机改性钛层柱粘土的吸附的性能。结果表明有机改性的钛层柱粘土比蒙脱土、钛层柱粘土具有更佳的吸附活性。
The titanium sol precursors as pillaring agent were prepared by the hydrolysis of titanium isopropoxide (TTIP) in various mediums, including HC1 aqueous solutions and acetic aqueous solutions. The titanium pillared clays with different pore structure were synthesized by the pillaring of sodium-based montmorillonite with various Ti sol precursors. The preparation conditions, such as reaction temperature, aged time and calcined temperature et al., were studied to evaluate their effects for Ti-PILCs' structure. In this study, The Ti-PILC synthesized by the pillaring of Ti-precursor from the hydrolysis of modified TTIP with acetate group in water was firstly reported. A complete characterization of the intercalated solids was carried out by XRD, FT-ER, TEM and N2 adsorption-desroption studies.
    The Fe-exchange Ti-pillared clays were synthesized by cation doping techniques. The catalytic properties of Fe-Ti-PILCs as heterogeneous catalysts in catalytic wet peroxide oxidation of simulated phenol solutions were evaluated and the optimum reaction conditions were achieved.
    The Ti-PILCs modified with cetyltrimethyl ammonium bromide were synthesized and the resulting Ti-PILCs showed better adsorptive properties for organic compounds than the original. The organic modified Ti-PILCs as absorbents in absorption and decolorization of methyl orange solutions were studied and the results demonstrated that the organic modified Ti-PELCs presented higher adsorption activities than montmorillonite and Ti-PILCs.
引文
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