In-site interface growth of bismuth-based hydrothermal carbon using collagen fiber for selective removal of iodide ion from wastewater

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2023-05, Vol.664, p.131177, Article 131177
• Main Authors: Zhu, Hui, Cao, Liyan, Cheng, Xin, Ding, Pingping, Zhu, Wenkun, Duan, Tao, He, Guiqiang, Wei, Yanxia, Sun, Dequn, Zhou, Yan, Zhou, Jian
• Format: Article
• Language: English
• Subjects: Adsorption; Bismuth-based collagen fiber; Iodide ion; Pharmaceutical wastewater; Removal
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2023.131177

The effective adsorption and removal of iodide ion from pharmaceutical wastewater is of great importance. In this paper, a novel adsorbent BT@ACF-Bi for iodide ion recognition adsorption was successfully constructed by chelating Bi3+ at the interface of activated collagen fiber (ACF) coated with plant polyphenols (bayberry tannin, BT). The results showed that BT@ACF-Bi(0.5) reached an adsorption capacity of 55 mg/g at pH 4.0, temperature 25 °C and an initial concentration of 150 mg/L. The iodide ion removal rate reached 90.04% when the adsorbent mass was 160 mg. Meanwhile, the kinetic model and isothermal adsorption fitting for the adsorption process of iodide ion by BT@ACF-Bi(0.5) showed that the process was more consistent with the pseudo-second-order kinetic model and the Freundlich isotherm model. In addition, Bi2O3 generated from the solid loading of Bi3+ on the adsorbent surface is an effective grip for iodide ion, which eventually form stable compounds with the adsorbent in the form of Bi4O5I2. Therefore, the prepared BT@ACF-Bi(0.5) is expected to play an important role in the removal of iodine-containing pharmaceutical wastewater in complex systems due to its high removal rate, ability to be prepared on a large scale and environmental friendliness. [Display omitted] •The adsorbent was prepared from leather waste and plant polyphenol by crosslinking curing-hydrothermal method.•The adsorbent had a recognition adsorption effect on iodide ion, and the adsorption capacity reached 55 mg/g.•The adsorbent had good stability and could be prepared on a large scale.