Utilization of Novel Cationic Hydrogels for Removal of Toxic Anions from Water
نویسندگان
چکیده
Synthesis and application of poly (3-Acrylamidopropyl)-trimethylammonium chloride (PAPTMACl) hydrogels as adsorbents for removal of toxic anions such as arsenate from water were investigated. PAPTMACl hydrogels were synthesized in the form of small cylinders, with using N, N’-methylene-bisacrylamide (MBA) as crosslinker. N,N,N’,N’-tetramethylethylenediamine (TEMED) was used as an accelerator, and ammonium persulfate (APS) was used as redox initiator. Arsenic concentration was measured by Inductive Coupled Plasma (ICP) analysis. The hydrogels were regenerated and the adsorbed arsenic fractions were eluted by using 1M NaOH. Swelling and pH sensitivity were measured for hydrogels characterization. Different parameters affecting adsorption process such as metal and hydrogels concentration, retention time, pH, and equilibrium isotherm were investigated. Results obtained revealed that the hydrogels behave as cationic exchangers and swellable gel adsorbents for As(V). The relatively bigger size of the cylinder shapes of the hydrogels solved the problem of powder separation from water after adsorption. The adsorption process was optimized by using 1.5 g/L hydrogels for 50 ppm As(V) at pH 9 for 360 minutes. The removal efficiency of As(V) was 99.7%.
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