生物炭改性TiO_(2)锐钛矿-金红石相S型同质结的构建及其光催化降解四环素研究  

Construction of S-scheme homojunction of biochar-modified TiO_(2)anatase-rutile phase and its photocatalytic degradation of tetracycline

作　　者：安明泽 张兵兵 杨照 陈蔚洁[1,2,3] 王盛 薛斌 秦舒浩 AN Mingze;ZHANG Bingbing;YANG Zhao;CHEN Weijie;WANG Sheng;XUE Bin;QIN Shuhao(Guizhou Material Industrial Technology Institute,Guiyang 550022,China;National Engineering Research Center for Compounding and Modification of Polymer Materials,Guiyang 550014,China;College of Resources andEnvironmental Engineering Department,Guizhou University,Guiyang 550025,China;College of Materials and Metallurgy,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州省材料产业技术研究院,贵阳550022 [2]国家复合改性聚合物材料工程技术研究中心,贵阳550014 [3]贵州大学资源与环境工程学院,贵阳550025 [4]贵州大学材料与冶金学院,贵阳550025

出　　处：《功能材料》2025年第2期2167-2178,共12页Journal of Functional Materials

基　　金：贵州省基础研究(自然科学)(QKHJC-ZK[2023]YB158);黔科合支撑[2022]一般219;贵州省黔东南州科技支撑计划项目(黔东南科合J字[2022]59)。

摘　　要：构建具有高效电荷迁移效率和丰富活性位点的梯形(S型)同质结光催化剂是提升光催化性能的一种有效途径。研究采用典型的水热结合热解法制备了一系列生物炭改性TiO_(2)锐钛矿-金红石相S型同质结催化剂(TBC)。催化剂结构表征和原位XPS测试结果表明,优化条件下的TBC550催化剂主要由生物炭和TiO_(2)锐钛矿与金红石相组成,与之构建的TiO_(2)锐钛矿与金红石相S型同质结可促进光生载流子通过生物炭、锐钛矿-金红石的界面进行转移。同时,当光照射在TBC550催化剂界面上时,在内置电场、带边弯曲和库仑力的协同作用下,促进了氧化能力的光生电子与还原能力的光生空穴复合,抑制了氧化能力的光生空穴与还原能力的光生电子转移,进而使电子和空穴具有较高的氧化还原能力。此外,在紫外、可见和模拟太阳光照射下,TBC550催化剂对四环素(TC)水溶液的光催化降解率分别为96.5%、78.3%和89.1%,且5次循环后仍保持良好的稳定性。研究工作可以丰富我们对新型S型同质结光催化剂的认识,为未来使用太阳能驱动光催化降解环境中的污染物提供一种有前景的策略。Constructing step-scheme(S-scheme)homojunction photocatalysts with high charge transfer efficiency and abundant active sites is an effective way to enhance photocatalytic performance.In this study,a series of biochar-modified TiO_(2)anatase-rutile phase S-scheme homojunction catalysts(TBC)were prepared by typical hydrothermal combined pyrolysis method.The characterization of catalyst structure and in-situ XPS testing results indicate that the TBC550 catalyst under optimized conditions was mainly composed of biochar and TiO_(2)rutile-rutile phase.The S-scheme homojunction of TiO_(2)anatase-rutile phase constructed with it can promote the transfer of photogenerated charge carriers through the interface of biochar and anatase-rutile.Meanwhile,when light was irradiated on the interface of TBC550 catalyst,under the synergistic effect of built-in electric field,band edge bending,and coulomb force,the photogenerated electrons of oxidation ability and photogenerated holes of reduction ability are promoted to recombine,and the photogenerated electrons of oxidation ability and photogenerated electrons of reduction ability are inhibited,so that the electrons and holes have high redox ability.Furthermore,under ultraviolet,visible,and simulated sunlight irradiation,the photocatalytic degradation rates of TBC550 catalyst for tetracycline(TC)aqueous solution were 96.5%,78.3%,and 89.1%,respectively,and the stability remained good after 5 cycles.This research work could enrich our understanding of new S-scheme homojunction photocatalysts and provide a promising strategy for the future use of solar driven photocatalysis for the degradation of environmental pollutants.

关 键 词：生物炭 TiO_(2)锐钛矿-金红石相 S型同质结 光催化降解 四环素 

分 类 号：TB332[一般工业技术—材料科学与工程] TS151[轻工技术与工程—纺织材料与纺织品设计]