Efficient and enhanced Hg2+ removal from water using a thio functionalized fibrous adsorbent prepared with microwave irradiation: Batch and fixed-bed column study. (10th September 2020)

• Record Type: Journal Article
• Authors: Deng, Sheng; Yu, Chunxue; Liu, Xinhui; Wu, Feng; Lin, Hui; Liao, Jianbo; Liu, Fang
• Is Part Of: Journal of cleaner production. Volume 267(2020)
• Publication Date: 2020-09-10
• Subjects: Hg2+ -- Adsorption -- Microwave irradiation -- Fixed bed column tests -- Regeneration; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2020.122163
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: In this study, a thio functionalized polyacrylonitrile (PAN) fiber was promptly prepared with microwave irradiation which exhibited high removal efficiency for Hg 2+ . The modified fiber (PANMW -Thio) was synthesized by initially cross-linked with diethylenetriamine and then further reacted with Na2 S to introduce thio ligands onto the interface of PAN fiber. Following characterization of PANMW -Thio fiber were performed by XRD, FTIR, SEM and elemental analysis. The Hg 2+ uptake performance by modified fiber prepared with MW irradiation was compared with that of conventional heating in terms of adsorption kinetics, adsorption isotherm and adsorption thermodynamics. The results revealed that PANMW -Thio exhibited much higher adsorption amount for Hg 2+ with the maximum uptake amount of 357 mg/g. Moreover, multiple operation parameters in the dynamic adsorption test were also investigated, and the maximum adsorption amount of PANMW -Thio fiber was obtained at initial Hg 2+ concentration of 100 mg/L, bed height of 15 cm and 10 mL/min flow rate, respectively. Dynamic experiment results also proved that the capacities of PANMW -Thio fiber improved when initial concentration and bed height increased and flow rate decreased. Furthermore, the Thomos, Yoon-Nelson and BDST models were utilized to analyze experiment data, while Thomas model exhibited best fitness with the breakthrough curves. Finally, the regeneration ability of PANMW -Thio fiber in column was studied using 0.05 M HCl as the desorption eluent and the adsorption capacity remained well after five reuse cycles. This rapid preparation method and good adsorption performance of prepared adsorbent promise a new solution for Hg 2+ pollution remediation in water.