期刊
CHEMICAL ENGINEERING JOURNAL
卷 442, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.136306
关键词
NH2-MIL-125; Silver ion; Adsorption; Mechanism; 3Rs approach
资金
- National Natural Science Foundation of China [51878023]
- Beijing Talent Project [2020A27]
- Science and Technology General Project of Beijing Municipal Education Commission [KM202110016010]
- Fundamental Research Funds for Beijing University of Civil Engineering and Architecture [X20147/X20141/X20135/X20146]
- Young Teachers Research Ability Enhancement Program for Beijing University of Civil Engineering and Architecture [X21085]
- BUCEA Post Graduate Innovation Project (2021)
In this study, NH2-MIL-125(Ti) was used to remove Ag(I) from simulated silver-plating wastewater. The results showed that NH2-MIL-125 exhibited superior adsorption performance for Ag(I) ions and could potentially be used on a large scale. The influencing parameters of the adsorption process were examined, and the regeneration and utilization of NH2-MIL-125 were explored. This study achieved the goal of reducing, recycling, and reusing resources.
In this work, NH2-MIL-125(Ti) were adopted to eliminate Ag(I) from the simulated silver-plating wastewater. The results revealed that NH2-MIL-125 exhibited superior adsorption performance toward Ag(I) ions with uptake capacity of 192.5 mg.g(-1) to that of MIL-125 (139.8 mg.g(-1)) within 60 min. The isotherm and kinetic data were exactly fitted to both Langmuir and Pseudo-second-order models. The thermodynamic parameters like enthalpy change (Delta H degrees), entropy change (Delta S degrees) and Gibbs free energy change (Delta G degrees) confirmed that the adsorption process was spontaneous, exothermic and disordered. As well, the influencing parameters of the adsorption process like pH, adsorbent dose and foreign metal ions were examined. The fixed-bed column filled with NH2-MIL-125 powder immobilized onto cotton fiber could continuously adsorb Ag(I), which offered the possibility of achieving potential large-scale applications. The possible adsorption mechanism of NH2-MIL-125 toward Ag(I) primarily involved the electrostatic adsorption and coordinative interactions, which was further affirmed by the density functional theory (DFT) calculations. In addition, the used NH2-MIL-125 saturated with Ag(I) ions could be either desorbed to release the Ag(I) for NH2-MIL-125 re-generation or further calcinated into Ag/C/TiO2 photocatalyst to accomplish photocatalytic degradation toward organic pollutants like methylene blue (MB) and phenol. In this work, the 3Rs (reduce, recycle and reuse) approach was practiced, accomplishing that one stone killed three birds (pollutant elimination, resource recovery and resource utilization).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据