دانلود رایگان مقاله حذف یون فلزات از محلول آبی با استایرن کربوکسی متیل سلولز / سدیم ژل سولفونات

ABSTRACT

Sodium Carboxymethyl Cellulose (CMC Na)/Sodium Styrene Sulfonate (SSS) hydrogels with grafted and crosslinked polymeric networks were prepared by -radiation at atmosphere condition. The obtained hydrogels were characterized by gel fraction, swelling ratio, TGA and FTIR spectroscopy. The results showed the ratio of CMC and SSS 1:0 gave the highest gel fraction, compared with other ratios. The swelling capacity increased by increasing SSS content due to the presence of SO3Na, OH groups in gel structure. The FTIR spectrum of CMC/SSS gel showed the new absorption peaks at 1034 and 1012 cm−1 corresponds to SO3Na group. The metal ion adsorption capacity of CMC/SSS gel was investigated. The grafted gel effectively removed metal ions, especially Cr and Pb. The effects of hydrogel composition, contact time, and initial concentration on the adsorption capacity of the grafted hydrogels were studied. The adsorption kinetics and equilibrium isotherms were investigated using pseudo-second-order model and Langmuir model.

4. Conclusion

Heavy metal contamination has been a serious problem throughout the world because of the hazardous effects on the health of humans. Even though there are well established techniques for the heavy metal removal from drinking water, their usage can be limited by cost. Hence, there exists a need to develop a method for heavy metal removal from aqueous solution which is cost effective, efficient and eco-friendly. We propose a novel method of using CMC grafted with SSS to remove heavy metals from water. Based on the results the following can be concluded: - The CMC/SSS hydrogel was synthesized by using gamma irradiation. Water absorbency for this hydrogel showed higher than CMC hydrogel resulting from the COOH and SO3H groups on the polymer chains. - The hydrogel’s functional groups revealed by spectroscopic analyses and later tested for adsorption properties included the carboxylate and sulfonate moieties. These groups enabled successful adsorption of metal ions from aqueous solution. The optimum pH value for metal uptake was around 6. - The kinetics of adsorption process indicated that adsorption process was chemisorption process and monolayer sorption took place on the surface of the CMC/SSS hydrogel.