TiO_2/g-C_3N_4的制备及光催化降解偏二甲肼废水

Preparation of TiO_2/g-C_3N_4 composites and photocatalytic degradation unsymmetrical dimethylhydrazine waste water

以钛酸丁酯为钛源采用水热合成法制备不同复合比的TiO_2/g-C3N4材料,借助XRD、FT-IR、TEM、UV-Vis DRS和PL对材料进行表征,并在可见光下进行偏二甲肼(UDMH)废水降解实验。考察了催化剂浓度、pH、UDMH初始浓度对降解效果的影响。结果表明,TiO_2/g-C3N4材料晶型结构完整,TiO_2以纳米颗粒形态在g-C3N4片层上均匀分布,拓展了可见光吸收范围,提升了对光生空穴-电子的分离能力。TiO_2与g-C3N4质量比为10%时,TiO_2/gC3N4光催化活性最佳,反应120 min对UDMH的降解率达到96.49%,相比g-C3N4提高了49.46%。

Butyl titanate was selected as titanium source of TiO2 and the TiO2/g-C3N4 composites of compound ratio was prepared by the hydrothermal method. The samples were characterized by XRD,FTIR,TEM,UV-Vis DRS and PL,the samples was used to degrade unsymmetrical dimethylhydrazine（ UDMH）waste water under visible-light. The influence of catalyst concentration,pH and UDMH initial concentration on photodegradation UDMH was also investigated. The results show that the crystal structure of TiO2/g-C3N4 composites is well,TiO2 nanoparticles show smaller particle size and uniformly distribution on g-C3N4 sheets,the response ability and the separation ability of hole-electron of the composite are improved. The TiO2/g-C3N4 shows highest photocatalytic activity,reaction 120 min,when mass ratio of compound is 10 %,the degradation rate reach 96. 49 % and was improved 49. 46 % with g-C3N4.