期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 88, 期 -, 页码 66-80出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2016.03.032
关键词
Polyacrylamide-grafted gum ghatti hydrogel nanocomposite; Methylene blue; Adsorption kinetics and isotherms
资金
- National Research Foundation [NRF-083640]
- University of Johannesburg, the Department of Science and Technology [HGERA8X]
- Council for Scientific and Industrial Research [HGER20S]
The objective of this work was to study the isotherm and kinetic models for the adsorption of methylene blue (MB) onto a TiO2 nanoparticle (TiO2NP)-containing hydrogel nanocomposite (HNC) of polyacrylamide-grafted gum ghatti (PAAm-g-Gg). The grafting of PAAm onto Gg was conducted using N,N'-methylene-bis-acrylamide (MBA) as a crosslinker, and different weight percentages of TiO(2)NPs were incorporated into the hydrogel matrix during the grafting reaction. The graft co-polymerization and the formation of the HNC were confirmed using FTIR, XRD, BET, SEM, TEM and EDS analyses. The adsorption of MB was studied in batch mode and it was found to be highly dependent on solution pH, ionic strength temperature and adsorbent loading. The MB-adsorption process followed the pseudo second-order rate model and Langmuir adsorption isotherm with a maximum adsorption capacity of 1305.5 mg g(-1). Thermodynamic studies revealed that the adsorption of MB onto the HNC surface was spontaneous, endothermic and through a process of physisorption. The results also showed that the HNC was much more effective for the adsorption of cationic dyes than anionic dyes, and it retained its original adsorption capacity for five successive cycles of adsorption-desorption. In conclusion, the hydrogel nanocomposite showed huge potential for remediating industrial wastewater polluted by toxic cationic dyes. (C) 2016 Elsevier B.V. All rights reserved.
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