Carbon-tunable p-type ZnO nanoparticles for enhanced photocatalytic removal of Eriochrome Black T

Auwal Yusha’u, U. Gaya
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Abstract

Photocatalysis with ZnO is a promising alternative to TiO2 photocatalysis especially for the removal of various organic dye pollutants. Methods: Highly crystalline, nanoscopic carbon-doped ZnO was successfully synthesized via a combined precipitation and mechanochemical approach and characterized using x-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy and Fourier transform infrared (FTIR) analysis. The obtained photocatalysts depicts plate-like morphology and hexagonal wurtzite structure. The XRD, SEM, and FTIR analysis were in good agreement with EDX results. The 5wt % C-doped ZnO showed remarkable visible light-photocatalytic activity for the degradation of Eriochrome Black T (EBT) and exhibits a more favourable point of zero charge (pzc) for adsorption equilibrium. This degradative process was optimized at 97 % using response surface methodology (RSM) with a 0.1 g the C-ZnO and 5.00 mg/L EBT at pH 11. The kinetic data fits the pseudo-first order kinetics model. The resulting C-ZnO was a p-type with a good pH at zero point charge that permits the removal of EBT by C-doped under visible light irradiation over a very wide range of initial pH.
碳可调p型ZnO纳米颗粒增强光催化去除铬黑T
ZnO光催化是TiO2光催化的一种很有前途的替代方法,特别是在去除各种有机染料污染物方面。方法:采用沉淀法和机械化学相结合的方法成功合成了高结晶、纳米级的碳掺杂ZnO,并利用x射线衍射(XRD)、扫描电镜(SEM)、能量色散光谱和傅里叶变换红外(FTIR)分析对其进行了表征。得到的光催化剂具有板状形貌和六方纤锌矿结构。XRD、SEM和FTIR分析结果与EDX分析结果吻合较好。5wt % c掺杂ZnO对eriochromeblack T (EBT)的降解表现出显著的可见光催化活性,并表现出更有利的零电荷点(pzc)吸附平衡。在0.1 g C-ZnO和5.00 mg/L EBT的条件下,pH为11,利用响应面法(RSM)优化了该降解过程,降解率为97%。动力学数据符合准一级动力学模型。得到的C-ZnO为p型,具有良好的零电荷pH,可以在很宽的初始pH范围内可见光照射下掺杂c去除EBT。
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