Study of Metal Ions Removal from Aqueous Solution by Using Radiation Crosslinked Chitosan‐co‐Poly(Acrylamide)‐Based Adsorbent

Abstract

Summary: A series of hydrogels as heavy metals adsorbent were prepared from chitosan and acrylamide by gamma irradiation at room temperature. Chitosan solutions with different concentration (1%, 2%, 3%) (w/v) have been mixed with 7.5% (w/v) of acrylamide and irradiated at doses of 10-40 kGy. The properties of the prepared hydrogel of chitosan-co-poly(acrylamide) (Chi-co-PAAm) were evaluated in terms of the gel fraction and degree of swelling. It was found that the incorporation only 3% (w/v) chitosan with 7.5% (w/v) acrylamide can produces an elastic hydrogel when irradiated with gamma rays up to 15 kGy. Batch adsorption experiments were carried out to study heavy metals ions removal from its aqueous solutions. The different parameters effecting on the adsorption capacity such as contact time, pH of the solution, hydrogel dose, initial metal ion concentration, and competitive ions were investigated. The results indicated that the ions uptake performance of the hydrogel significantly changed with all the parameter tested. However, Chi-co-PAAm hydrogel demonstrated a great uptake ability for heavy metal ions. The order of heavy metal ions uptake on Chi-co-PAAm hydrogel was Zn 2þ > Cr 6þ > Pb 2þ > Cu 2þ > Co 2þ > Ni 2þ . The Freundlich and Langmuir adsorption isotherms models were applied to describe the isotherms and isotherm constants the adsorption data obtained in this study.

Pectin‐[(3‐acrylamidopropyl) trimethylammonium chloride‐co‐acrylic acid] hydrogel prepared by gamma radiation and selectively silver (Ag) metal adsorption

“…Here, the adsorption capacity decreases with increasing radiation dose. At higher radiation dose closed network hydrogels are formed where the void spaces are smaller . Due to the smaller void space, the adsorption capacity is lower for hydrogels prepared at higher radiation doses.…”

Application of factorial experimental design to optimize radiation‐synthesized and biodegradable super water absorbent based on cassava starch and acrylic acid

“…SWA products are polymeric materials which have been utilized in agriculture as a means to store and control the release of water, fertilizer, and pesticide, thereby increasing plant performance and survivability while minimizing agro‐environmental pollution 3,4 . These polymers can also be used to purify chemically contaminated water through sorption of toxic heavy metals and dyes 5–8 . Despite these favorable attributes, recent studies have drawn attention to how some commercial SWAs pose environmental problems as they are non‐biodegradable and not suitable for use in agricultural soil 9–11 .…”

Chitosan Hydrogel for Removing of Heavy Metal Ions from Water: A Review

“…Several basic parameters need to be taken into consideration in wastewater that must be measured by the municipality and they are chemical oxygen demand, alkalinity, pH, phosphorous and its compounds, conductivity, solids and suspended matter, organic carbon [10]. In recent, chitosan has been utilized as a crude material to synthesize the hydrogels in widely potential and reasonable applications like wastewater treatment [11].…”