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Dokument Nr.200301641 (klicken Sie bitte auf die Dokumentnummer um dieses Dokument anzuzeigen)
TitelAmmonium perchlorate-binding poly(allylamine hydrochloride) hydrogels for wastewater remediation
AbstractSystems that are capable of removing highly toxic anions from wastewater effluents, even at extremely low concentrations, are a major need in the defense industry. This study reports on the features of two new batch and continuous-flow sorption processes with regard to ultimate removal and recovery of the perchlorate (ClO(-)(4)) anion from ammonium perchlorate (NH(4)ClO(4)) wastewater. The sorbent developed is a crosslinked poly(allylamine hydrochloride) (PAA.HCl) polymeric hydrogel. The pH-sensitive PAA.HCl hydrogels were synthesized by chemically crosslinking a solution of linear PAA.HCl chains with epichlorohydrin (EPI). The perchlorate-binding capacity of the polymer gels was measured in standard solutions and studied as a function of gel synthesis parameters. Equilibrium perchlorate loadings of 5770 ± 870 mg ClO(-)(4)/g gel were calculated from measurement of the decrease in perchlorate concentration in aqueous standard solutions using UV-Vis spectrophotometry. Batch experiments in wastewater originating from the Naval Surface Warfare Center (NSWC) Indian Head Division showed that perchlorate concentrations decreased by 85%. Preliminary lab-scale packed-column experiments in wastewater achieved up to 40% reduction in total perchlorate content. The regeneration ability of the gels was demonstrated by release of the bound perchlorate anions, upon washing with a 1N NaOH solution, providing opportunities to recover and reuse the hydrogel over multiple regeneration cycles. The PAA.HCl hydrogels are demonstrated to be appropriate materials for treating wastewaters that contain ammonium perchlorate. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 2073-2083, 2001 (orig.)
Control terms engl.ALLYL POLYMERS; AMINES; AMMONIUM COMPOUNDS; ANIONS; CONCENTRATION; CROSSLINKING; HYDROGELS; HYDROGEN CHLORIDE; PH VALUE; POLYAMINES; SOLUTIONS; SORPTION; SYNTHESIS; TOXICITY; UV SPECTROSCOPY; WASTE WATER; WATER TREATMENT
Control terms germanALLYLPOLYMERE; AMINE; AMMONIUMVERBINDUNGEN; ANIONEN; KONZENTRATION; VERNETZUNG; HYDROGELE; CHLORWASSERSTOFF; PH-WERT; POLYAMINE; LOESUNGEN; SORPTION; SYNTHESE; TOXIZITAET; UV-SPEKTROSKOPIE; ABWASSER; WASSERAUFBEREITUNG