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以氯代十六烷基吡啶(CPC)、聚乙二醇6000(PEG6000)和十二烷基磺酸钠(SDS)为模板剂,采用水热法合成宽禁带Ga_2O_3纳米晶(Ga_2O_3CPC、Ga_2O_3PEG6000和Ga_2O_3SDS)。利用X射线衍射法(XRD)、扫描电镜(SEM)、紫外可见漫反射(UV-Vis DRS)、比表面积测定仪(BET)对催化剂晶相结构、形貌、比表面积以及其带隙进行了表征。其中Ga_2O_3CPC为单相α-Ga_2O_3,棒状形貌,Ga_2O_3PEG6000和Ga_2O_3SDS都为α和β相共存的多相Ga_2O_3。在紫外光(λ=254 nm)照射下,分别以罗丹明B(rhodamine B,Rh B)和水杨酸(salicylic acid,SA)为目标降解物,发现Ga_2O_3CPC活性最好,反应4 h Rh B基本降解完全,45min对SA的降解率达到94.92%。通过测定降解过程中产生的活性物种及Rh B降解过程中红外吸收光谱的变化,指出Ga_2O_3CPC对Rh B的深度氧化矿化过程是涉及·OH自由基的氧化历程。
Hydrothermal synthesis of wide bandgap Ga 2 O 3 nanocrystals (Ga 2 O 3 CPC, Ga 2 O 3 PEG6000) was carried out by using chlorodecyl pyridinium chloride (CPC), polyethylene glycol 6000 (PEG6000) and sodium dodecyl sulfate (SDS) And Ga 2 O 3 SDS). The crystal structure, morphology, specific surface area and band gap of the catalyst were characterized by XRD, SEM, UV-Vis DRS and BET. Characterization. Among them, Ga_2O_3CPC is single-phase α-Ga_2O_3, rod-like morphology, Ga_2O_3PEG6000 and Ga_2O_3SDS are both multiphase Ga_2O_3 with α and β phases coexisting. Rhodamine B (Rh B) and salicylic acid (SA) as the target degradation products under the irradiation of UV light (λ = 254 nm), respectively. The results showed that the activity of Ga_2O_3CPC was the best, Basic degradation completely, 45min SA degradation rate of 94.92%. Through the determination of the active species produced during degradation and the change of infrared absorption spectra during the degradation of Rh B, it was pointed out that the deep oxidation mineralization of Ga 2 O 3 CPC to Rh B involves the oxidation of · OH radicals.