标题：Chemo-thermal Treatment of Tribulus tresstris to Enhance Its Sequestering Potential for Adsorption of Some Heavy Metals from Aqueous Media: Kinetic and Thermodynamic Study
期刊名称：Pakistan Journal of Analytical & Environmental Chemistry
印刷版ISSN：1996-918X
电子版ISSN：2221-5255
出版年度：2016
卷号：17
期号：2
页码：124-133
DOI：10.21743/pjaec.v17i2.262
语种：English
出版社：National Centre of Excellence in Analytical Chemsitry
摘要：The plant based renewable biosorbents have extensively been investigated for removing water pollutants. The present study describes the sequestering of metal ions by exploiting a low cost biomaterial derived from Tribulus tresstris as sorbent. The batch equilibrium studies have been carried out both with raw and chemically/thermally treated biomaterial as a function of pH,contact time,shaking speed and shaking time to decide the effectiveness of biosorbent. The sorbent was activated chemically by utilizing 0.1M HCl and 0.1M K2CO3. A close muffle furnace was used for thermal treatment of the sorbent. The adsorption capacity was enhanced to 25% by thermal treatment and 54% by chemical treatment because of increase in pore volume and surface area. The greatest sorption was found for particle size of 200 µm with a 0.5 g dosage at pH 6 for 20 min at shaking speed 100 rpm. The FT-IR and SEM study was performed to discover the adsorption capacity of various functional groups and their binding mechanism. The adsorption data demonstrates that Langmuir,Freundlich and Dubinin-Radushkevich isotherm models were very much fitted to describe the adsorption behavior..
关键词：Biosorption;Metal ions;Tribulus tresstris;Freundlich;Langmuir and Dubinin– Radushkevich isotherms.
