Ti3C2纳米层状材料对废水中Cr（Ⅵ）的光催化去除性能

以Ti₃AlC₂为原料,采用HF刻蚀工艺制备出12种Ti₃C₂纳米层状材料,对其形貌进行了表征,并考察了以其作为光催化剂对废水中Cr（Ⅵ）的处理效果。实验结果表明：HF体积分数为80%、刻蚀时间为48 h时得到的MX-80-48的形貌较好;MX-80-48具有类似石墨烯的二维层状结构,纳米层厚度约20~50 nm,孔径2~10 nm,比表面积14.8 m²/g,在400~700 nm可见光范围内表现出强烈的吸光性;当Cr（Ⅵ）的初始质量浓度为40.00 mg/L、MX-80-48投加量为200 mg/L、pH=2、反应时间4 h（暗反应1 h+光照3 h）时,Cr（Ⅵ）去除率可达100%。

Photocatalytic removal capability of Ti3C2 nano-layered material to Cr（Ⅵ） in wastewater

Twelve kinds of Ti₃C₂ nano-layered materials were prepared by HF etching process using Ti₃AlC₂ as raw material. The morphology of the prepared Ti₃C₂ was characterized and the treatment effect of Cr（Ⅵ） in wastewater by Ti₃C₂ was investigated. The experimental results show that MX-80-48 obtained by etching in HF with 80% of volume fraction for 48 h has the best morphology;MX-80-48 has a two-dimensional layered structure similar to graphene,and the thickness of each layer is about 20-50 nm,the pore diameter is 2-10 nm,the specific surface area is 14.8 m²/g;It also has a strong light absorption in the visible light range of 400-700 nm;When the initial mass concentration of Cr（Ⅵ） is 40.00 mg/L,MX-80-48 amount is 200 mg/L,pH is 2,the reaction time is 4 h（dark reaction 1 h + light reaction 3 h）,the removal rate of Cr（Ⅵ） can reach 100%.