碳纤维支撑的钾离子调谐TiC/TiO_(2)层状异质结复合催化剂制备研究  

Preparation of carbon fiber supported layered TiC/TiO_(2) catalyst with potassium ion tuning

作　　者：丰雪帆 王化中 王小明 喻文瑞 杨宇 张福勤[1] Feng Xuefan;Wang Huazhong;Wang Xiaoming;Yu Wenrui;Yang Yu;Zhang Fuqin(Powder Metallurgy Research Institute,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]中南大学粉末冶金研究院,湖南长沙410083

出　　处：《钢铁钒钛》2021年第3期58-63,共6页Iron Steel Vanadium Titanium

摘　　要：采用原位生长方法制备了一种碳纤维为载体,通过钾离子(K^(+))调谐的具有TiC/TiO_(2)层状异质结的复合催化剂,用FE-SEM、XRD、Raman、XPS和AFM对制备的催化剂进行了表征,并进行了光催化降解污染物罗丹明B试验。研究表明钾离子对异质结的调谐对光催化效率有重要影响。在紫外-可见光催化降解过程中,CFs@TiC/TiO_(2)对污染物RhB的去除率达到98%。经过3次循环使用后,该复合材料对污染物光催化去除效率仍大于90%,表明能重复稳定使用。K^(+)协同的原位生长过程经过熔盐体系在碳纤维(CFs)表面生长TiC,并在KOH水溶液中进行水热反应,将部分TiC转化为钛酸钾纳米粒子,随后将钛酸钾纳米颗粒浸泡在稀释的HCl溶液中,将酸中的H+交换为钛酸钾中的K^(+)经过热处理和脱水后,纳米颗粒形成片状锐钛矿型TiO_(2),最终形成碳纤维支撑的TiC/TiO_(2)层状异质结的CFs@TiC/TiO_(2)复合催化剂。钛酸钾纳米晶形成的花状结构具有较大的比表面积,这种结构为制备CFs@TiC/TiO_(2)复合材料构建了结构特征和催化活性位点。A carbon fiber supported layered TiC/TiO_(2) composite catalyst with heterojunction was prepared by in-situ synthesis with potassium ion(K^(+))tuning.The prepared catalysts were characterized by FE-SEM,XRD,Raman,XPS and AFM.The photocatalytic degradation of pollutants rhodamine B(RhB)by the catalysts was carried out.The results show that the tuning of potassium ion to heterojunction plays an important role in photocatalytic efficiency.In the process of UV-visible-light catalytic degradation,the removal rate of RhB by CFs@TiC/TiO_(2) reaches 98%.The repeated experiments show that the photocatalytic removal efficiency is more than 90%after three cycles,indicating a well stability.TiC can be grown on the surface of carbon fibers(CFs)via the in-situ growth collaborated by K^(+),and partial TiC can be transformed into potassium titanate nano particles through hydrothermal process in NaOH solution.The potassium titanate nano particles were then soaked in dilute HCl solution,and flake anatase TiO_(2) can be formed via heat treatment and dehydration.Finally,carbon fiber supported CFs@TiC/TiO_(2) composite catalyst with layered heterojunction can be obtained.The flower-like structure formed by potassium titanate nanocrystals has a large specific surface area,which provides the structural characteristics and catalytic activity sites for preparation of CFs@TiC/TiO_(2) composites.

关 键 词：光催化剂 TiC/TiO_(2)层状异质结 碳纤维 原位生长 钾离子 

分 类 号：TF823[冶金工程—有色金属冶金] TQ426[化学工程]