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An efficient catalytic degradation of trichloroethene in a percarbonate system catalyzed by ultra-fine heterogeneous zeolite supported zero valent iron-nickel bimetallic composite

机译:超细非均质沸石负载零价铁镍双金属复合材料催化过碳酸盐体系中三氯乙烯的有效催化降解

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摘要

Zeolite supported nano iron-nickel bimetallic composite (Z-nZVI-Ni) was prepared using a liquid-phase reduction process. The corresponding surface morphologies and physico-chemical properties of the Z-nZVI-Ni composite were determined using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Energy dispersive X-ray spectra (EDS), Brunauer Emmett Teller (BET) adsorption, wide angle X-ray diffractometry (WA-XRD), and Fourier transform infrared spectroscopy (FTIR). The results indicated high dispersion of iron and nickel nano particles on the zeolite sheet with an enhanced surface area. Complete destruction of trichloroethene (TCE) and efficient removal of total organic carbon (TOC) were observed by using Z-nZVI-Ni as a heterogeneous catalyst for a Fenton-like oxidation process employing sodium percarbonate (SPC) as an oxidant. The electron spin resonance (ESR) of Z-nZVI-Ni verified the generation and intensity of hydroxyl radicals (OH). The quantification of OH elucidated by using p-chlorobenzoic acid, a probe indicator, confirmed the higher intensity of OH. The transformation products were identified using GC-MS. The slow iron and nickel leaching offered higher stability and better catalytic activity of Z-nZVI-Ni, demonstrating its prospective long term applications in groundwater for TCE degradation.
机译:采用液相还原法制备了沸石负载的纳米铁镍双金属复合材料(Z-nZVI-Ni)。使用扫描电子显微镜(SEM),透射电子显微镜(TEM),能量色散X射线光谱(EDS),Brunauer Emmett Teller(BET)确定Z-nZVI-Ni复合材料的相应表面形态和理化性质吸附,广角X射线衍射(WA-XRD)和傅立叶变换红外光谱(FTIR)。结果表明,铁和镍纳米颗粒在沸石板上的高度分散,具有增加的表面积。通过使用Z-nZVI-Ni作为使用过碳酸钠(SPC)作为氧化剂的Fenton类氧化过程的非均相催化剂,可以观察到三氯乙烯(TCE)的完全破坏和有效去除总有机碳(TOC)。 Z-nZVI-Ni的电子自旋共振(ESR)验证了羟基自由基(OH )的产生和强度。使用探针指示剂对氯苯甲酸阐明的OH 定量分析证实了OH 的强度更高。使用GC-MS鉴定转化产物。铁和镍的缓慢浸出提供了Z-nZVI-Ni更高的稳定性和更好的催化活性,证明了其在地下水中三氯乙烯(TCE)降解的长期应用前景。

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