期刊
ARABIAN JOURNAL OF CHEMISTRY
卷 13, 期 1, 页码 1731-1740出版社
ELSEVIER
DOI: 10.1016/j.arabjc.2018.01.010
关键词
Adsorption; Membrane adsorbent; Nanodiamonds; Heavy metals; Isotherm
资金
- Kharazmi University
- Petrochemical Research and Technology Company
Detonation nanodiamonds (DNDs), for the first time, were utilized to modify chitosan/polyvinyl alcohol (CS/PVA) thin membrane adsorbents. For this purpose, different contents of DNDs, from nil to 1.5 wt%, were embedded in the polymer matrix of the membranes to obtain the optimum content. Static adsorption of Pb(II) on the prepared membrane adsorbents was studied. The fabricated membranes were characterized in terms of morphology and performance using scanning electron microscopy (SEM) micrographs and Fourier transform infrared (FTIR) spectrum analyses. Langmuir and Freundlich isotherms were used to model the equilibrium adsorption. The effects of pH, temperature, and initial metal concentration on the adsorption capacity were investigated. Results showed that adsorption of lead ion is more favorable at pH = 6. Thermodynamic parameters including Delta H degrees, Delta S degrees and Delta G degrees revealed endothermic, entropy-driven and spontaneous nature of the adsorption. Adsorption capacity for Pb(II) increased from 29.5 mg g(-1) (for the plain membrane) to 121.3 mg g(-1) by the addition of 1.5 wt% DNDs; however, the optimal content was 1 wt% DNDs considering both mechanical stability and adsorption capacity. Results revealed that the ultra-thin CS/PVA membrane adsorbents modified with DNDs are very potential candidates for heavy metal adsorption. (C) 2018 Production and hosting by Elsevier B.V. on behalf of King Saud University.
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