Abstract
Two novel weakly basic anion exchange resins BNH and BN2 bearing two different functional groups was fabricated via the two-step amination of chloromethylated polystyrene-divinylbenzene beads with dibutylamine and dimethylamine. The adsorption properties of BNH and BN2 for the 2-naphthalenesulfonic acid (NSA) removal from wastewater were compared with two synthesized monofunctional anion exchange resins BN0 and BN6 (derived from dimethylamine and dibutylamine, respectively). The experimental data revealed that the adsorption process on the four resins fitted well with the pseudo-second-order kinetics equation and the equilibrium isotherms were in good agreement with the Langmuir model. Thermodynamic analyses illustrated that 2-naphthalenesulfonic acid adsorption onto resins was an endothermic and spontaneous process. Importantly, BN2 still displayed relatively high adsorption capacity in the existence of Na2SO4, indicative of an excellent selectivity for 2-naphthalenesulfonic acid over sulfate than other resins. The obtained results elucidate that BN2 could have potential industrial application in effluent disposal fields because of its superior selectivity, acceptable kinetics, and desorption capability.
Highlights
Owing to the discharge of abundant wastewater and hazardous substances, effluent from dye-related industries, such as tanning agent, printing, and textile has drawn widespread attention
We have introduced dicyclohexylamine and piperidine into chloromethylated polystyrene-divinylbenzene (Cl-PS-DVB) beads, respectively, to prepare two novel weakly basic anion exchange resins that can adsorb benzenesulfonic acid selectively from an aqueous solution containing sulfate (Sun et al, 2017)
When pH is in the range of 2–7, the adsorption of naphthalenesulfonic acid (NSA) on resin BN0 with only dimethylamine functional groups is seriously affected by pH than other resins containing dibutylamine functional groups
Summary
Owing to the discharge of abundant wastewater and hazardous substances, effluent from dye-related industries, such as tanning agent, printing, and textile has drawn widespread attention. Adsorption is known as a high-efficiency, cost-effective, and available technique, and various adsorbents have been explored to remove ASAs. For instance, Gu et al produced an adsorbent via introducing reed straw (RS) into sewage sludge-based activated carbon, and the presence of RS enhances the adsorption of 1-diazo-2-naphthol-4-sulfonic acid from aqueous solution (Gu et al, 2014). There are few reports about the removal of ASAs onto weakly basic resins due to their relatively low selectivity in saline wastewater To circumvent this problem, some researchers found that the introduction of functional groups to adsorbent could better enhance the adsorption capacity of pollutants, and improve its selectivity (Fu et al, 2016; Li et al, 2012; Zhang and Xu, 2014). The functionalization of adsorbent using low-cost amines is essential to improve the adsorption selectivity
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