Enhanced selective removal of Pb(II) by modification low-cost bio-sorbent: Experiment and theoretical calculations. (20th September 2021)

• Record Type: Journal Article
• Authors: Xiong, Chao; Xue, Can; Huang, Liyun; Hu, Peng; Fan, Ping; Wang, Shixing; Zhou, Xiantai; Yang, Zujin; Wang, Yongqing; Ji, Hongbing
• Is Part Of: Journal of cleaner production. Volume 316(2021)
• Publication Date: 2021-09-20
• Subjects: Bio-sorbent -- Pb(II) -- Adsorption -- Selectivity -- Mechanisms; 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.2021.128372
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Removal of Pb(II) from water is an important issue for improving water quality. However, the use of cost-effective and more environmentally friendly adsorbents to achieve highly-efficient adsorption capacity is still a challenge. A novel bio-sorbent (PP-DBD) is developed by functionalizing pomelo peels to remove Pb(II) in water. PP-DBD achieves the enrichment of Pb(II) (adsorption amount of 443.51 mg/g and removal rate of 99.98%) after 2 h and exhibits good selectivity and reusability (6 cycles). Isothermal studies show that adsorption is an irreversible process with positive synergism of multiple sites, and a active site has the ability to adsorb 1.29 Pb(II). The kinetics indicates that adsorption is chemisorption and the rate-limiting step is surface diffusion. The thermodynamic study reveals that the adsorption of Pb(II) is enhanced at higher temperatures by a spontaneous process. This study also shows that hydroxyl sites have a better affinity and easier charge transfer capacity to Pb(II) than amino sites on PP-DBD by DFT and FMOs calculations. In conclusion, PP-DBD is a promising adsorbent for the removal of Pb(II) in aqueous solution.