Synergistic effect of homojunction and Ohmic junctions in CdS boosting spatial charge separation for U(VI)photoreduction  

作　　者：Haonan Pei Zhimin Dong Zifan Li Jian Huang Yuanping Jiang Zuojia Li Lin Xu Xiaohong Cao Yunhai Liu Zhibin Zhang Guoping Yang 

机构地区：[1]State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China

出　　处：《Nano Research》2024年第8期6849-6859,共11页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22066003,U2167223,22206024,22076022,and 22006014);the Natural Science Foundation of Jiangxi province(Nos.20224ACB203005 and 20232BAB213034).

摘　　要：Photo-excited holes usually migrate to the surface of the catalyst and rapidly recombine with electrons,reducing the photocatalytic reduction efficiency of uranium(VI)(U(VI))in radioactive wastewater.Consequently,we employed a straightforward synthesis technique to meticulously shape and manipulate the morphology of CdS to precisely construct CdS-Ni dandelion-like composites with different aspect ratios.Briefly,the introduction of crystal facet homojunction with Ohmic contacts in this unique morphology siqnificantly improves the photocatalytic efficiency.Temperature-dependent photoluminescence spectroscopy(TD-PL)verifies that the composite material positively effects on the dissociation of excitons.Within 30 min,CdS(002)/(102)/Ni-4 removed 98% of the uranium content in solution and showed a rather high apparent rate constant(0.114 min^(−1)),which was 4.8 times higher than that of CdS nanospheres(NSs)(0.024 min^(−1))and 3.7 times higher than that of CdS nanorods(NRs)(0.031 min^(−1)).This is much higher the most reported photocatalysts for U(VI)reduction.Even after 5 consecutive cycles,the photocatalytic efficiency only decreased by 7%.This offers a fresh perspective on constructing a new perspective for building a green,efficient,and multi mechanism collaborative catalytic system to remediate environmental pollution.

关 键 词：uranium dandelion-shaped axial size effect crystal facet homojunction ohmic contact 

分 类 号：TB383[一般工业技术—材料科学与工程]