Department of Environmental Engineering, Kwangwoon University, Seoul, 01897, Republic of Korea.
Department of Environmental Engineering, Kwangwoon University, Seoul, 01897, Republic of Korea.
Chemosphere. 2021 Mar;267:128889. doi: 10.1016/j.chemosphere.2020.128889. Epub 2020 Nov 6.
Heavy metals contamination of water is one of the environmental issue globally. Thus prepared fly ash-based zeolite (FZA)-supported nano zerovalent iron and nickel (nZVI/Ni@FZA) bimetallic composite from low-cost fly ash waste for the potential treatment of anion (Cr(VI) and cation Cu(II)) heavy metals from industrial effluents at pH 3 and 5, respectively in this study. The systematic interaction between FZA and nZVI/Ni and the adsorptive removal mechanism was studied. The mean surface area of the nZVI/Ni@FZA (154.11 m/g) was much greater than that of the FZA (46.6 m/g) and nZVI (4.76 m/g) independently, as determined by BET-N measurements. The effect of influence factors on the removal of Cr(VI) and Cu(II) by nZVI/Ni@FZA, such as pH effect, initial concentration effect, time effect, temperature effect, coexisting metals, and ionic strength, and cumulative loading ability, were discussed. The maximum adsorption capacity of nZVI/Ni@FZA was 48.31 mg/g and 147.06 mg/g towards Cr(VI) and Cu(II), respectively. These were higher than those of nZVI@FZA and FZA. It demonstrated that Ni could play an important role in enhancing the reduction ability of nZVI. Furthermore, isothermal and kinetic results revealed that both heavy metal adsorption processes were rate limiting monolayer Langmuir adsorption on homogeneous surfaces. Thermodynamic results suggested that the adsorptive removal of metal ions was endothermic with spontaneity. The applicability of nZVI/Ni@FZA on real industrial wastewater treatment results demonstrate that the concentration of heavy metals were removed under the acceptable standard levels. Further the adsorption capacity of nZVI/Ni@FZA was higher than the nZVI@FZA and FZA. The overall results demonstrated that nZVI/Ni@FZA was a promising, efficient, and economically feasible sorbent for potential wastewater treatment. Moreover this is first report on the preparation nZVI/Ni@FZA bimetallic composite.
水中重金属污染是全球性的环境问题之一。因此，本研究从廉价的粉煤灰废物中制备了沸石（FZA）负载的纳米零价铁和镍（nZVI/Ni@FZA）双金属复合材料，用于分别在 pH 值为 3 和 5 时处理工业废水中的阴离子（Cr(VI)和阳离子 Cu(II)）重金属。研究了 FZA 与 nZVI/Ni 之间的系统相互作用和吸附去除机制。通过 BET-N 测量，nZVI/Ni@FZA（154.11 m/g）的平均表面积远大于 FZA（46.6 m/g）和 nZVI（4.76 m/g）的表面积。讨论了影响因素对 nZVI/Ni@FZA 去除 Cr(VI)和 Cu(II)的影响，如 pH 值影响、初始浓度影响、时间影响、温度影响、共存金属和离子强度以及累积负载能力。nZVI/Ni@FZA 对 Cr(VI)和 Cu(II)的最大吸附容量分别为 48.31 mg/g 和 147.06 mg/g。这些值高于 nZVI@FZA 和 FZA。这表明 Ni 可以在增强 nZVI 的还原能力方面发挥重要作用。此外，等温线和动力学结果表明，重金属吸附过程均为限制在均匀表面上的单层 Langmuir 吸附。热力学结果表明，金属离子的吸附去除是吸热的自发性过程。nZVI/Ni@FZA 在实际工业废水处理中的应用结果表明，重金属浓度在可接受的标准水平下被去除。此外，nZVI/Ni@FZA 的吸附容量高于 nZVI@FZA 和 FZA。总体结果表明，nZVI/Ni@FZA 是一种有前途、高效且经济可行的废水处理吸附剂。此外，这是关于制备 nZVI/Ni@FZA 双金属复合材料的首次报道。
