Adsorption of boron by CA@KH-550@EPH@NMDG (CKEN) with biomass carbonaceous aerogels as substrate

• Published in: Journal of hazardous materials 2018-09, Vol.358, p.10-19
• Main Authors: Sun, Li, Huang, Jiancheng, Liu, Haining, Zhang, Yujie, Ye, Xiushen, Zhang, Huifang, Wu, Aiguo, Wu, Zhijian
• Format: Article
• Language: English
• Subjects: Adsorbent; Adsorption; Biomass carbonaceous aerogel; Boron; N-methyl-d-glucosamine (NMDG)
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2018.06.040

[Display omitted] •A boron adsorbent of CKEN was prepared via modification of biomass carbonaceous aerogel by NMDG.•CKEN has an excellent adsorption performance for boron in coexisting NaCl solution (0–2.0 mol/L).•The adsorption process of the novel CKEN does not cause contamination of the aqueous solution.•The regeneration process of the CKEN adsorbent is relatively simple. This research reports an innovative boron adsorbent of CA@KH-550@EPH@NMDG (CKEN) via the modification of N-methyl-d-glucosamine (NMDG) on the surface of biomass carbonaceous aerogel, which is environmentally friendly, economically inexpensive, has simple preparation process and good regenerability. SEM and FT-IR characterization results indicate that CKEN has a 3D cross-staggered structure with lots of hydroxyl groups and pore structure, which are beneficial to the diffusion of boron and the chelation interaction between boron and CKEN. The adsorption behavior of CKEN for boron was evaluated. Various parameters affecting adsorption properties, viz., pH, ionic strength, initial concentration of boron, temperature and contact time were investigated. The adsorption kinetics is fitted with pseudo-second-order kinetics model better and the adsorption of boron on CKEN is an exothermic process. The adsorption equilibrium reached within 15 h with the maximum adsorption amount of 1.42 mmol/g (298 K). Moreover, CKEN also showed excellent reusability by consecutive five cycles of adsorption-desorption. It can be used as a potential recyclable adsorbent for efficient enrichment of boron from aqueous solution.