13X沸石/TiO_2复合光催化材料的制备及对亚甲基蓝的光催化降解性能

以溶胶凝胶法分别制备了TiO2和不同TiO2含量的负载型13X沸石/TiO2复合光催化剂,对制备出的光催化剂分别进行了XRD和SEM表征。在紫外灯下以250mL浓度为30mg/L的亚甲基蓝溶液为目标污染物,研究了13X/TiO2的去除或光催化降解性能。结果表明：制备出的TiO2粒径约2750nm并附着在沸石颗粒表面,当负载量为50%时达到最佳配比,其去除率和光催化降解率分别为74.66%和62.64%,此时13X/TiO2复合光催化剂具有最大的光催化降解效率。

粉煤灰基TiO_(2)/X沸石制备及其光催化氧化NO

为探究粉煤灰基沸石负载TiO_(2)光催化氧化NO的性能,以粉煤灰和TiO_(2)为原料,采用常规碱熔融水热法制备得到高附加值粉煤灰基TiO_(2)/X沸石材料,并将其作为光催化剂通过光催化氧化NO实验,研究了不同实验条件下催化剂的光催化氧化性能.结果表明:O_(2)的存在提高了催化剂NO吸附和光催化氧化性能,而无氧条件下无法将NO氧化为高价态NO_(x);随着NO质量浓度的增大,NO_(x)去除率逐渐降低;随着相对湿度的增大,NO_(x)去除率逐渐降低,导致这一现象的主要原因是水分子与NO在催化剂表面存在竞争吸附.

由天然沸石和二氧化钛制备的功能材料光催化抑制水中粪肠球菌活性(英文)

The functional materials based on natural zeolite(clinoptilolite),TiO2-zeolite and Ag-TiO2-zeolite have been successfully synthesized by solid-state reaction in fast-hydrothermal conditions.The obtained functional materials were investigated by X-ray diffraction(XRD),FT-IR(Fourier transform infrared)spectroscopy,DRUV-VIS(diffuse reflectance ultraviolet-visible)spectroscopy,BET(Brunauer-Emmett-Teller)and SEM/EDX(scanning electron microscope/energy dispersive X-ray spectrometer)analyses.The XRD results indicated that the clinoptilolite structure has a good thermal stabilization after the fast-hydrothermal treatment.Also,the high specific surface area about 92.55 m2·g 1was noticed for Ag-TiO2-zeolite functional material.The presence of dopants was evidenced from EDX spectra.The enhanced bactericidal activity of Ag-TiO2-zeolite catalyst is proved through damaging of Enterococcus faecalis colonies under visible irradiation,at different material doses and irradiation times.