An ultra-porous g-C_(3)N_(4) micro-tube coupled with MXene(Ti_(3)C_(2)TX)nanosheets for efficient degradation of organics under natural sunlight  

作　　者：Zongyang Ya Qiyou Wang Jingjin Cai Peng Wang Xinyu Jiang Zhiyin Cai Shanglin Xiang Tingwei Wang Dongyu Cai 

机构地区：[1]College of Materials Science&Engineering,Nanjing Tech University,30 South PuZhu Road,Nanjing 211816,China [2]Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM),Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM),Nanjing Tech University,30 South PuZhu Road,Nanjing 211816,China

出　　处：《Journal of Environmental Sciences》2024年第3期258-270,共13页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.21503110);the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)。

摘　　要：It remains as a challenge for realizing efficient photo-responsive catalysts towards largescale degradation of organic pollutants under natural sunlight.This work reports a new pore engineering strategy for creating ultra-porous g-C_(3)N_(4) micro-tubes with an unprecedentedly high specific surface area of 152.96 m^(2)/g.This is mainly associated with releasing internal vapor pressure in the autoclave where the hydrothermal treatment of the urea/melamine mixture is processed.Supported by microscopic observation,porosity measurement and spectroscopic characterization,it is found that releasing the pressure at halfway of hydrothermal process is vital for forming exfoliated rod-like precursors and the de-aggregation of these rods presents substantial benefits on the production of mesopores on g-C_(3)N_(4) microtubes during the calcination of precursors.This offers a large number of reactive sites required by photocatalytic reaction.Coupling these micro-tubes with Ti_(3)C_(2)T_(X) nanosheets via electrostatic interaction yields a 1D/2D heterojunction with a close interfacial contact.The addition of metallically conductive Ti_(3)C_(2)T_(X) nanosheets accelerates the separation between electrons and holes,and also enhances the light absorption.All these merits of structural design lead to forming a group of highly efficient catalysts demonstrating an excellent photocatalytic degradation rate of k=0.0560 min^(-1)for RhB dyes under 100 mW/cm~2 visible light radiation that micks sunlight outdoors.This laboratory valuation is further supported by an outdoor test that shows a fast degradation rate of 0.0744 min^(-1)under natural sunlight.

关 键 词：Carbon nitride MXene HETEROJUNCTION Photocatalysis 

分 类 号：X505[环境科学与工程—环境工程] TQ426[化学工程]