双金属片
甲基橙
水溶液
膨润土
化学
核化学
纳米颗粒
催化作用
零价铁
硝酸盐
反应性(心理学)
反应速率常数
动力学
无机化学
吸附
化学工程
材料科学
有机化学
纳米技术
光催化
工程类
医学
替代医学
物理
病理
量子力学
作者
Ting Wang,Jin Su,Xiaoying Jin,Zuliang Chen,Mallavarapu Megharaj,Ravi Naidu
标识
DOI:10.1016/j.jhazmat.2013.09.028
摘要
Bentonite supported Fe/Pd nanoparticles (B/nZVI/Pd) were synthesized as composites that exhibit functionalities assisting in the removal of methyl orange (MO) from aqueous solution. The results showed that 91.87% of MO was removed using B/nZVI/Pd, while only 85% and 1.41% of MO were removed using nZVI/Pd and bentonite after 10 min, respectively. The new findings include that the presence of bentonite decreased the aggregation of nZVI/Pd and nZVI in the composite played its role as a reductant, while Pd0 acted as the catalyst to enhance the degradation of MO, which were confirmed by scanning electron microscopy (SEM), X-ray diffraction (XRD), UV–vis analysis and the batch experiments. The increase in B/nZVI/Pd loading led to greater removal efficiency, while decolorization efficiency declined in the presence of anions such as nitrate, sulfite and carbonate, especially nitrate, which decreased the apparent rate constant kobs almost 17.06-fold. The kinetics study indicated that the degradation of MO fitted well to the pseudo-first-order model, where the kobs was 0.0721 min−1. Finally, the reactivity of aged B/nZVI/Pd was investigated, and the application of B/nZVI/Pd in wastewater indicated a removal efficiency higher than 93.75%. This provided a new environmental pollution management option for dyes-contaminated sites.
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