Inorganic coordination polymer quantum sheets@graphene oxide composite photocatalysts: Performance and mechanism
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Inorganic coordination polymer quantum sheets@graphene oxide composite photocatalysts: Performance and mechanism Shixiong Li1,a) , Qiaoling Mo1, Xiaoxia Lai1, Yufeng Chen1, Chuansong Lin1, Yan Lu1, Beiling Liao2,b) 1
School of Chemical Engineering and Resource Recycling, Wuzhou University, Wuzhou 543002, China School of Chemistry and Biological Engineering, Hechi University, Hechi 546300, People’s Republic of China a) Address all correspondence to these authors. e-mail: [email protected] b) e-mail: [email protected] 2
Received: 14 April 2019; accepted: 22 May 2019
Heterogeneous photocatalytic oxidation technology is currently a technology with the potential to solve environmental pollution and energy shortages. The key to this technology is to find and design efficient photocatalysts. Here, a series of inorganic coordination polymer quantum sheets (ICPQS)@graphene oxide (GO) composite photocatalysts are synthesized by adding GO to the synthesis process of ICPQS: {[CuII(H2O)4][CuI4(CN)6]}n. These composite photocatalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, cyclic voltammetry, scanning electron microscopy, transmission electron microscopy, Zeta potential, and N2 adsorption/desorption isotherms. The photocatalytic degradation of methylene blue showed that the activity of ICPQS@GO composite photocatalysts is better than that of ICPQS. Among ICPQS@GO composite photocatalysts, the 10.6% ICPQS@GO composite photocatalyst has the best activity, which can reach 3.3 mg/(L min) at pH 3. This method of loading low–specific surface area photocatalysts onto GO to improve photocatalytic performance indicates the direction for the synthesis of highly efficient photocatalysts.
Introduction Environmental pollution and energy shortages are problems of globalization and urgently need to be resolved. How to remove pollutants efficiently is a hot and difficult point in research [1]. Heterogeneous photocatalytic oxidation technology has the characteristics of low energy consumption, mild reaction conditions, and no secondary pollution [2, 3]. It is an effective technology to solve environmental pollution and energy shortage problems [4, 5]. The key to the application of this technology in life is to find or design efficient photocatalysts. At present, photocatalysts are mainly based on traditional inorganic semiconductors [6, 7, 8]. Doping and morphological modification of traditional inorganic semiconductor photocatalysts can improve their photocatalytic activity [9, 10, 11]. But their application is affected, because of the difficulty of modification and unstable activity. As a new material, metal– organic frameworks (MOFs) have been studied in gas storage [12, 13], adsorption [14, 15, 16], fluorescence [17, 18, 19],
ª Materials Research Society 2019
magnetism [20, 21, 22, 23], and reduction of CO2 [24, 25]. It has also made some good achievements in photocatalytic degradation of organic pollutants [26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36]. However, these materials need to be prepared at the nano-
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