Chitin/egg shell membrane@Fe3O4 nanocomposite hydrogel for efficient removal of Pb2+ from aqueous solution. Issue 7 (3rd February 2022)

• Record Type: Journal Article
• Authors: Jia, Baoquan; Liu, Dingna; Niu, Chengyu; Yu, Qili; Ren, Jie; Liu, Qingye; Wang, Haiqiang
• Is Part Of: RSC advances. Volume 12:Issue 7(2022)
• Page Start: 4417
• Page End: 4427
• Publication Date: 2022-02-03
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra08744d
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A novel kind of chitin/EM@Fe3 O4 nanocomposite hydrogel derived from the biowastes of egg shell membrane and chitin was successfully prepared for efficient removal of Pb 2+ from wastewater solution. Abstract : The development of adsorbents by using the byproducts or waste from large-scale industrial and agricultural production is of great significance, and is considered to be an economic and efficient strategy to remove the heavy metals from polluted water. In this work, a novel chitin/EM@Fe3 O4 nanocomposite hydrogel was obtained from a NaOH/urea aqueous system, where the proteins of egg shell membrane and Fe3 O4 nanoparticles were chemically bonded to chitin polymer chains with the help of epichlorohydrin. Due to the existence of a large number of –NH2, –OH, –CONH–, –COOH and hemiacetal groups, the adsorption efficiency for Pb 2+ into the absorbent was dramatically enhanced. The experimental results revealed that the adsorption behavior strongly depends on various factors, such as initial pH, initial Pb 2+ concentration, incubation temperature and contact time. The kinetic experiments indicated that the adsorption process for Pb 2+ in water solution agreed with the pseudo-second-order kinetic equation. The film diffusion or chemical reaction is the rate limiting process in the initial adsorption stage, and the adsorption of Pb 2+ into the nanocomposite hydrogel can well fit the Langmuir isotherm. Thermodynamic analysis demonstrated that such adsorption behaviors were dominated by an endothermic (Δ H ° > 0) and spontaneous (Δ G ° < 0) process.