Constructing 0D/1D Ag3PO4/TiO_(2) S-scheme heterojunction for efficient photodegradation and oxygen evolution  

构建0D/1D Ag_(3)PO_(4)/TiO_(2) S型异质结以实现高效光降解和析氧

作　　者：Yukun Zhu Yan Zhuang Lele Wang Hua Tang Xianfeng Meng Xilin She 朱玉坤;庄严;王乐乐;唐华;孟献丰;佘希林(青岛大学环境科学与工程学院,山东青岛266071;江苏大学材料科学与工程学院,江苏镇江212013)

机构地区：[1]School of Environmental Science and Engineering,Qingdao University,Qingdao 266071,Shandong,China [2]School of Materials Science&Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China

出　　处：《Chinese Journal of Catalysis》2022年第10期2558-2568,共11页催化学报（英文）

基　　金：国家自然科学基金(21975110);山东省泰山青年学者计划.

摘　　要：An S-scheme heterojunction photocatalyst is capable of boosting photogenerated carrier separation and transfer,thus maintaining high photooxidation and photoredox ability.Herein,a 0D Ag_(3)PO_(4) nanoparticles(NPs)/1D TiO_(2) nanofibers(NFs)S-scheme heterojunction with intimate interfacial contact was designed via the the hydro-thermal method.Benefiting from the abundant hydroxyl groups and size confinement effect of TiO_(2) NFs,the average diameter of the Ag_(3)PO_(4) nanoparticles decreased from 100 to 22 nm,which favored the construction of a 0D/1D geometry heterojunction.The multifunctional Ag_(3)PO_(4)/TiO_(2) sample exhibited excellent photocatalytic activity and stability in photocatalytic oxygen production(726μmol/g/h)and photocatalytic degradation of various organic contaminants such as rhodamine B(100%),phenol(60%)and tetracycline hydrochloride(100%).The significant improvements in the photocatalytic performance and stability can be attributed to the intimate interfacial contacts and rich active sites of 0D/1D geometry,fast charge carrier migration,and outstanding photoredox properties induced by the S-scheme charge-transfer route.This work offers a promising strategy for constructing 0D/1D S-scheme heterojunction photocatalysts for improved photocatalytic performance.化石燃料的大量使用使人类面临前所未有的能源枯竭与环境污染问题,因此,寻求和发展可持续能源与技术迫在眉睫.光催化过程利用催化剂捕获光子将太阳能转化成各种能源与化学品,是一种极具潜力的绿色可持续技术.理性设计高效的捕光材料与催化体系是实现高效太阳能利用与转化的有效策略.而光催化剂的效率主要受制于电荷分离效率低、氧化还原能力不足等缺陷.在众多提高光催化效率的策略中,异质结光催化剂的构建是解决以上问题的有效途径.与传统的Ⅱ型异质结光催化剂相比,阶梯(S)型异质结在氧化型和还原型半导体之间构筑了内建电场,动力学上加速了光生载流子的分离、迁移并且保留催化剂最高的氧化还原能力,成为一类极具应用潜力的异质结催化剂.本文通过简单的水热法将Ag_(3)PO_(4)纳米颗粒原位生长在TiO_(2)纤维表面,制备了0D/1D Ag_(3)PO_(4)/TiO_(2) S型异质结.两者之间通过构筑紧密的界面接触有效降低了光生载流子的传输障碍,促进了界面电荷转移,从而在光催化产氧和光分解罗丹明B、苯酚和盐酸四环素方面表现出优异的活性和光稳定性.催化体系的一系列表征结果均验证了Ag_(3)PO_(4)/TiO_(2)复合材料的成功制备.物相表征表明,均匀负载在TiO_(2) NFs表面的Ag_(3)PO_(4) NPs颗粒尺寸更小,这是由于TiO_(2)纳米纤维(NFs)中丰富的羟基使得二氧化钛纤维具备显著的限域效应,可以有效地防止Ag_(3)PO_(4)颗粒的聚集.此外,Ag_(3)PO_(4)/TiO_(2)的比表面积远大于Ag_(3)PO_(4),比表面积的增加有利于提供更多的活性位点,从而提高光催化活性.光电测试分析表明,Ag_(3)PO_(4)/TiO_(2)具有较高的载流子分离和迁移效率;功函数的密度泛函理论计算结合XPS数据证实了内建电场的建立及其从TiO_(2)指向Ag_(3)PO_(4)的方向.上述实验和理论计算结果都确定了Ag_(3)PO_(4)/TiO_(2)在光照下的S型�

关 键 词：S-Scheme heterojunction 0D/1D Ag_(3)PO_(4)/TiO_(2) Oxygen production Photocatalytic degradation 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]