镍-二氧化钛核壳复合微球的制备及其光电性能研究

Preparation and Photoelectric Properties of Ni-TiO_(2) Composite Microspheres with Core-Shell Structure

目的:镍-二氧化钛核壳复合微球的制备及其光电性能研究。方法:采用水合肼还原乙酸镍制备了镍微球,通过对不同反应介质、反应时间、pH值以及表面活性剂的考察,以获得制备镍微球的最佳条件;再以镍微球为核心材料,制备了Ni-TiO_(2)核壳复合材料。对其光吸收和光催化性能进行评价紫外可见光下。结果:在使用1,2-丙二醇为溶剂,以聚乙烯吡咯烷酮为表面活性剂,反应时间2 h的条件下制备得到了分散性较好的镍微球。以镍微球为核心材料,在1,2-丙二醇中通过水解钛酸丁酯,TiO_(2)成功负载于镍球表面,复合材料在紫外光和可见光下光催化降解率分别为78.6%和79.5%,其吸收波长范围可达550 nm左右,其复合微球的禁带宽度为2.23 eV。结论:复合微球具有比单一TiO_(2)更广的光吸收范围,Ni-TiO_(2)核壳复合材料在紫外光和可见光下都表现出更好的光催化性能。

Objective:To investigate preparation and photoelectric properties of Ni-TiO_(2) composite microspheres with core-shell structure were investigated.Methods:A mild chemical method was used to prepare Ni microspheres by using Ni(Ac)2 and N 2H 4 as metal ion precursor and reducing agent,respectively.The effect of pH value,temperature,reaction time and surface-active agent on the formation of nickel nanoparticles were investigated to obtain the optimal condition to nickel microspheres.The photoelectron is properties were evaluated under UV-VIS.Results:The spherical nickel microspheres could be obtained by adjusting the pH at 13 when the additive PVP was added.TiO_(2) was successfully loaded on the nickel nanoparticle during the hydrolysis of tetrabutyl titanate.In terms of photoeleatronic properties,the degradation rate of UV-VIS was 78.6%and 79.5%,respectively.The absorption warelength range was about 550 nm,and the band gap was 2.23 eV.Conclusion:The obtained Ni-TiO_(2) composite microspheres showed better absorption property and excellent photocatalytic property under ultraviolet and visible light.