【摘要】：懫用十六烷基三甲基溴化銨為模板劑,鈦酸四丁酯為鈦源、正硅酸乙酯為硅源,硝酸鉻為金屬前驅(qū)體,通過一步法制備了吸附性能優(yōu)異且具有紫外-可見光催化活性的Ti-Cr-MCM-48鈦硅分子篩催化劑。通過XRD、FT-IR、SEM、BET、UV-Vis等分析手段對產(chǎn)物進行結(jié)構(gòu)表征并研究了樣品對羅丹明B的吸附以及光催化性能,同時探究了鈦含量對分子篩結(jié)構(gòu)與性能的影響。結(jié)果表明,當鈦含量為n(Ti)/n(Si)=0.25時,鈦和鉻分散在分子篩骨架上,樣品0.25Ti-Cr-MCM-48依然具有大比表面積和介孔結(jié)構(gòu),成功解決了過渡金屬摻雜而造成比表面積下降的難題。同時樣品0.25Ti-Cr-MCM-48展現(xiàn)出了優(yōu)異的吸附和催化性能,3 h內(nèi)對羅丹明B的吸附、降解效率達到85%以上。而當鈦含量進一步提高時,分子篩的立方相結(jié)構(gòu)被破壞,孔道結(jié)構(gòu)堵塞嚴重,比表面積急劇下降,吸附性能下降。
[Abstract]:Cetyltrimethylammonium bromide as template, tetrabutyl titanate as titanium source, ethyl orthosilicate as silicon source, chromium nitrate as metal precursor, Ti-Cr-MCM-48 titanium-silicon molecular sieve catalysts with excellent adsorption performance and UV-visible photocatalytic activity were prepared by one step method. The structure of the product was characterized by XRD,FT-IR,SEM,BET,UV-Vis and the adsorption and photocatalytic properties of Rhodamine B were studied. The effects of titanium content on the structure and properties of molecular sieve were also investigated. The results show that when titanium content is n (Ti) / n (Si) = 0. 25, titanium and chromium are dispersed on the framework of molecular sieve, and 0.25Ti-Cr-MCM-48 still has large specific surface area and mesoporous structure. The problem of specific surface area decrease caused by transition metal doping has been solved successfully. At the same time, the 0.25Ti-Cr-MCM-48 showed excellent adsorption and catalytic performance. The degradation efficiency of Rhodamine B was more than 85% within 3 hours. When the titanium content is further increased, the cubic phase structure of the molecular sieve is destroyed, the pore structure is blocked seriously, the specific surface area drops sharply, and the adsorption property decreases.
【作者單位】： 浙江工業(yè)大學材料科學與工程學院;
【分類號】：O643.36;O644.1
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本文編號：2407907