Enhanced interfacial charge migration through fabrication of p-n junction in ZnIn2S4/NiFe2O4/biochar composite for photocatalytic doxycycline hydrochloride degradation
Enhanced interfacial charge migration through fabrication of p-n junction in ZnIn2S4/NiFe2O4/biochar composite for photocatalytic doxycycline hydrochloride degradation
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DOI：
10.1016/j.cej.2022.139745
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发表时间：
2023
影响因子：
15.1
通讯作者：
Qiong Wu;Youtao Song
中科院分区：
文献类型：
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作者：
Qiong Wu;Youtao Song
光催化剂的光致电子-空穴对复合、光响应能力和表面性质对其活性有很大影响。本文制备了ZnIn 2S 4/NiFe 2 O 4生物炭（ZIS/NFO/BC）p-n结材料，该材料具有提高的载流子迁移率、良好的光吸收和多级多孔结构。ZIS/NFO/BC在模拟太阳光下对盐酸多西环素表现出良好的光降解效率和TOC去除率，并在6次循环后表现出良好的稳定性和重复使用性。生物炭抑制了纳米粒子的团聚，提高了载流子迁移率和光吸收能力。生物炭的吸附与p-n结光催化降解的协同作用大大提高了光催化降解效率。光诱导空穴（h+）在光降解过程中发挥了重要作用。考察了pH值、共存离子（Cl-、NO3-、CO 32-）和腐殖酸对光降解的影响。提出了其光降解机理，并对可能的降解途径进行了阐述.本工作为开发具有高处理潜力的磁性可回收光催化剂提供了新的途径。
Photo-induced electron-hole pair recombination, light response ability and surface property of photocatalyst greatly affect its activity. In this paper, a p-n junction ZnIn2S4/NiFe2O4with biochar (ZIS/NFO/BC) was prepared, presenting improved charge carrier mobility, excellent light absorption and hierarchical porous micro-structure. ZIS/NFO/BC exhibited good photodegradation efficiency and TOC removal rate towards doxycycline hydrochloride under simulated sunlight, as well as good stability and reusability after six cycles. Biochar inhibited the agglomeration of nanoparticles, improved charge carrier mobility and light absorption ability. The synergy between adsorption of biochar and photocatalytic degradation of p-n junction greatly promoted photodegradation efficiency. Photo-induced holes (h+) played a major role during photodegradation. The effects of pH, coexisting ions (Cl-, NO3–, CO32–) and humic acid on photodegradation were investigated. Furthermore, the photodegradation mechanism was proposed and possible pathway was illustrated. This work provides new route for the development of magnetic recyclable photocatalyst with high potential for wastewater treatment.