Highly efficient sono-piezo-photo synergistic catalysis in bismuth layered ferroelectrics via finely distinguishing sonochemical and electromechanochemical processes  

作　　者：Lizhen Lu Nan Liang Haiqin Sun Qiwei Zhang Xihong Hao 

机构地区：[1]Inner Mongolia Key Laboratory of Ferroelectric-related New Energy Materials and Devices,School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,7#Arerding Street,Kun District,Baotou,014010,China

出　　处：《Journal of Materiomics》2022年第1期47-58,共12页无机材料学学报（英文）

基　　金：supported by the National Natural Science Foundation of China(No.51562030,52062042);the Natural Science Foundation of Inner Mongolia Autonomous Region of China(No.2018JQ06,2020MS05044).

摘　　要：Ultrasonic stimulation induced polarization behaviors in ferroelectric materials have been extensively explored in catalytic degradations.However,the ultrasonic wave similarly can realize dye degradation by the sonocatalysis behavior,which is always neglected in most reports on in-situ ultrasound-induced piezoelectric catalysis,so that people might overestimate piezocatalytic contributions.For this,we designed a series of visible light sensitive bismuth layered ferroelectric materials(BLFMs),M_(0.5)Bi_(2.5)Nb_(2)O_(9)(MBN,M=Li,Na,and K).It is found that the cavitation-induced degradation rates of Rhodamine B(RhB)strongly depend mechanical stirring speeds under a fixed ultrasonic power,which gradually increases with it,and reaches 77.9%(500 rpm and 3 h).Under lower stirring speed and reaction time(<50 rpm and 2 h),the cavitation effect is almost negligible,only piezocatalysis behavior occurs,which can be used as a key condition to distinguish the piezocatalysis and sonocatalysis.In particular,the degradation rate constant of Na_(0.5)Bi_(2.5)Nb_(2)O_(9) catalyst reaches up to 4.943×10^(-2) min^(-1) by the coupling of sonocatalysis,piezocatalysis and photocatalysis,which is much higher than that of single photocatalysis(0.491×10^(-2) min^(-1)),piezocatalytic(1.6×10^(-3) min^(-1)),and sonocatalysis(0.756×10^(-2) min^(-1)).These results may provide a feasible strategy of further improving catalytic degradation efficiency,and accurately determining the sonocatalysis and piezocatalysis contribution.

关 键 词：Polarization Piezocatalysis SONOCATALYSIS Ferroelectric materials 

分 类 号：O64[理学—物理化学]