Functionalization of pine needles by carboxymethylation and network formation for use as supports in the adsorption of Cr6
Functionalization of pine needles by carboxymethylation and network formation for use as supports in the adsorption of Cr6
复制标题
通过羧甲基化和网络形成对松针进行功能化，用作吸附 Cr6 的载体
DOI：
10.1016/j.carbpol.2007.04.020
复制
发表时间：
2007
影响因子：
11.2
通讯作者：
A. Kumari
中科院分区：
文献类型：
--
作者：
G. Chauhan;K. Chauhan;S. Chauhan;Sunil Kumar;A. Kumari
在N，N-亚甲基双丙烯酰胺存在下，松针及其羧甲基形式通过与2-丙烯酰胺基-2-甲基丙磺酸（AAmPSA）形成网络而被官能化。以N-四甲基乙二胺和过硫酸铵为促进剂-引发剂体系制备了该水凝胶。的水凝胶进行了表征，通过FTIR，SEM，氮分析和水的吸收能力之前和之后的金属离子吸附，以评估其在去除有毒的离子物种从废水中的使用。进行了详细的研究，作为时间，温度，pH值和离子强度的函数的Cr 6+吸附。吸附的热力学参数，如Δ H 0，Δ S 0，和Δ G 0已被评估，以了解潜在的吸附机理。为了了解它们在可能的技术应用中的可重复使用性，研究了这些水凝胶及其前体的生物降解性。
Pine needles and their carboxymethyl forms were functionalized by network formation with 2-acrylamido-2-methylpropanesulphonic acid (AAmPSA) in the presence of N,N-methylene bisacrylamide. N-Tetramethylethylene diamine and ammonium persulfate were used as accelerator-initiator systems to prepare these hydrogels. The hydrogels were characterized by FTIR, SEM, and nitrogen analysis and for water uptake capacities before and after metal ion sorption with a view to evaluating their use in the removal of toxic ionic species from waste water. A detailed study of Cr6+adsorption was carried out as a function of time, temperature, pH, and ionic strength. The thermodynamic parameters of adsorption such as ΔH0, ΔS0, and ΔG0have been evaluated to understand the underlying mechanism of adsorption. In order to understand their reusability in possible technological applications, biodegradability of these hydrogels and their precursors was studied.