期刊
MATERIALS FOCUS
卷 4, 期 2, 页码 154-163出版社
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/mat.2015.1232
关键词
Adsorption; Mercury; Electrospinning; Cellulose-Graphene Nanofibers; Kinetics
资金
- DIAT Effluent Project Program
Expunging of heavy metal ions from industrial and nuclear discarded water is of paramount importance. Accounting the feature of large surface area and porous structure of electrospun nanofibers, present investigation deals with the synthesis and characterization of electrospun cellulose-graphene nanocarbon fibers for selective speciation of Hg(II) ions with high efficacy. The effectiveness of these nanofibers was tested in batch adsorption process for the fast uptake of Hg(II) ions at pH 6.0 with 77% adsorption within 60 min. Cellulose-graphene nanofibers exhibits enhanced surface area of 14.86 m(2)/g as compared to cellulose fibers with 5.23 m(2)/g. The adsorption behaviour towards Hg(II) was assessed using different isotherm models (Langmuir, Freundlich, Temkin and Dubinin-Radushkevich). Evaluated values are quantified as, Langmuir constants q(max) = 13.73 mg/g, R-L = 0.65, Freundlich constants n = 1.30, K-F = 0.15 mg/g, Temkin constant K-T = 0.074 L/g and D-R parameter q(max) = 0.045 mol/g, epsilon = 2917.31. The kinetics of Hg(II) sorption has been exemplified by pseudo first-order, pseudo second-order and Elovich model with noble regression coefficient value (R-2 = 0.99). Intra-particle diffusion model delineates the chemical interaction between metal ion and the adsorbent. Thermodynamic studies revealed Delta G degrees value of - 12.90 kJ/mol, signifying feasibility and spontaneity of adsorption process. With the virtuous reusable property for cyclic Hg(II) removal (8 cycles), the newly developed cellulose-GNC fibers may hold a great promise for higher efficiency removal of Hg(II) ion from laboratory and industrial wastes.
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