Abstract
In this study, a novel asymmetric amine-based strongly basic anion exchange resin SE-1 was synthesized successfully via the reaction of chloromethylated styrene–divinylbenzene copolymer with N, N-dimethyloctylamine. The sorption performance of SE-1 for selective removal of nitrate in aqueous solution was compared to a commercially available nitrate specialty resin, namely Purolite A 520E (A 520E). It was found that the kinetic data could be described better by the pseudo-second-order model, and SE-1 indicated a faster sorption kinetics than A 520E resin. The Langmiur model was more appropriate for explicating the sorption isotherm. Importantly, SE-1 exhibited a greater sorption capacity for nitrate regardless of the absence or presence of competing anions in solutions. The result of column tests reinforced the feasibility of SE-1 for practical application in groundwater treatment.
Highlights
Nitrate contamination in surface water and groundwater is an increasingly serious problem in all over the world (Bergquist et al, 2016; Knoll et al, 2019)
Background nitrate concentrations in surface waters are usually below 5 mg/L, but groundwater nitrate contamination is a severe issue in developing countries, where higher nitrate content is frequently detected in groundwater (Beltran de Heredia et al, 2006; Liu et al, 2019)
1265 and 675 cmÀ1 were ascribed to C–H bending vibration of CH2Cl and C–Cl, respectively. The disappearance of both the peaks in SE-1 implied that effective interaction between N,N-dimethyloctylamine and CH2Cl/C–Cl group has occurred (Betiha et al, 2016)
Summary
Nitrate contamination in surface water and groundwater is an increasingly serious problem in all over the world (Bergquist et al, 2016; Knoll et al, 2019). A variety of traditional nitrate treatments, such as biological denitrification, membrane separation, ion exchange, sorption and chemical reduction have been presented (Epsztein et al, 2015; Hekmatzadeh et al, 2013; Li et al, 2016; Shi et al, 2016; Wu et al, 2019; Zhang et al, 2016). The subsequently developed strongly basic anion exchangers are nitrate-specialty resins such as Purolite A 520E (A 520E), Imac HP555, Amberlite IRA 996 and Indion NSSR (Hekmatzadeh et al, 2012). The nitrate selectivity of the specialty resin is improved, but the sorption kinetics and capacity of the resin are decreased (Bonnesen et al, 2000)
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