文献类型：期刊文献

英文题名：Preparation of Hydrogels Based Radix Isatidis Residue Grafted with Acrylic Acid and Acrylamide for the Removal of Heavy Metals

作者：Yin, Xiaochun[1,2];Zhu, Hai[2];Ke, Ting[2];Gu, Yonge[2];Wang, Huiyao[1];Xu, Pei[1]

第一作者：Yin, Xiaochun;殷晓春

通信作者：Wang, HY[1];Xu, P[1]

机构：[1]New Mexico State Univ, Dept Civil Engn, Las Cruces, NM 88003 USA;[2]Gansu Univ Chinese Med, Sch Publ Hlth, Lanzhou 730000, Peoples R China

第一机构：New Mexico State Univ, Dept Civil Engn, Las Cruces, NM 88003 USA

通信机构：[1]corresponding author), New Mexico State Univ, Dept Civil Engn, Las Cruces, NM 88003 USA.

年份：2022

卷号：14

期号：23

外文期刊名：WATER

收录：;EI(收录号：20225013237477);Scopus(收录号：2-s2.0-85143693046);WOS:【SCI-EXPANDED(收录号:WOS:000896199500001)】；

基金：This work was supported by the Innovation Fund Project of Higher Education in Gansu Province (2021B-159), the Natural Science Foundation of Gansu Province (21JR1RA257), and the Talent Introduction Plan of Gansu University of Chinese Medicine (2018YJRC-10).

语种：英文

外文关键词：hydrogel; Chinese herb residue; cellulose; biosorbent; heavy metal; removal

摘要：A series of hydrogels as biosorbents to remove heavy metal ions (Pb2+, Cu2+, and Cd2+) were prepared using Radix Isatidis residues as material grafted with acrylic acid and acrylamide. The surfaces of Radix Isatidis residue/acrylic acid-co-acrylamide (RIR/AA-co-AM), Radix Isatidis residue/polyacrylamide (RIR/PAM(3)), and Radix Isatidis residue/polyacrylic acid (RIR/PAA(4)) hydrogels have a sponge-like, three-dimensional, and highly microporous structure. The hydrogels all have considerable swelling properties and the swelling rate of RIR/PAA(4) is the highest at 9240%. The hydrogels all possess high adsorptivity to Pb2+, Cu2+, and Cd2+. Under optimized conditions, the maximum adsorption capacity of RIR/AA-co-AM hydrogel is 655.4 mg/g for Pb2+, 367.2 mg/g for Cd2+, and 290.5 mg/g for Cu2+. The maximum adsorption capacity of RIR/AA-co-AM hydrogel for Cd2+ and Cu2+ is slightly lower than that of RIR/PAA(4). In addition, the adsorption process of RIR/AA-co-AM for heavy metal ions conforms with the pseudo-second-order kinetic equation and Langmuir adsorption isotherm. Based on the microstructure analysis and adsorption kinetics, electrostatic adsorption and ion exchange are identified as the mechanisms for the hydrogels removal of heavy metal ions from water. It infers that hydrogels from Chinese herb residue can be used to effectively remove heavy metals from wastewater and improve the reutilization of Chinese herb residue.