Liu Yue, Shen Jimin, Zhao Laiqun, Wang Weiqiang, Gong Weijin, Zheng Fanfan
School of Energy & Environment Engineering, Zhongyuan University of Technology Zhongyuan Road 47 Zhengzhou China
State Key Laboratory of Urban Water Resources and Environment, School of Municipal & Environmental Engineering, Harbin Institute of Technology Harbin 150090 China.
RSC Adv. 2020 Mar 4;10(15):9146-9154. doi: 10.1039/d0ra00308e. eCollection 2020 Feb 27.
This research aimed at researching the degradation of acrylic acid (AA) in aqueous solution, by catalytic and non-catalytic ozonation processes performed in a semi-continuous reactor. Zinc-iron silicate was synthesized and characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) analysis, Fourier transformation infrared (FT-IR) and energy dispersive spectrometry (EDS). The characterization studies showed that Fe-Si binary oxide, Zn-Si binary oxide, ZnO and FeO deposits were formed on the surface of poor crystallinity zinc-iron silicate which contained abundant functional groups. Catalytic ozonation test results revealed that zinc-iron silicate exhibited high catalytic activity and stability in catalytic ozonation of AA in aqueous solution. The inclusion of zinc-iron silicate in the ozonation process enhanced AA decomposition by 28.7% and TOC removal by 20%, compared to the ozonation alone. The main AA removal mechanisms involved direct oxidation by ozone and indirect oxidation by hydroxyl radicals generated by the ozone chain reaction accelerated by zinc-iron silicate. The surface characteristics and chemical composition are significant factors determining the catalytic activity of zinc-iron silicate.
本研究旨在通过在半连续反应器中进行的催化和非催化臭氧化过程，研究水溶液中丙烯酸（AA）的降解情况。合成了锌铁硅酸盐，并使用X射线衍射（XRD）、X射线光电子能谱（XPS）分析、傅里叶变换红外光谱（FT-IR）和能量色散光谱（EDS）对其进行了表征。表征研究表明，在结晶度较差但含有丰富官能团的锌铁硅酸盐表面形成了铁硅二元氧化物、锌硅二元氧化物、氧化锌和氧化亚铁沉积物。催化臭氧化试验结果表明，锌铁硅酸盐在水溶液中对AA的催化臭氧化表现出高催化活性和稳定性。与单独臭氧化相比，在臭氧化过程中加入锌铁硅酸盐可使AA分解率提高28.7%，总有机碳（TOC）去除率提高20%。AA去除的主要机制包括臭氧的直接氧化和锌铁硅酸盐加速臭氧链反应产生的羟基自由基的间接氧化。表面特性和化学成分是决定锌铁硅酸盐催化活性的重要因素。
