Sustainable synthetic approach and applications of ZnO/r-GO in the adsorption of toxic Pb2+and Cr6+ions

被引:23
作者
Joshi, Naveen Chandra [1 ]
Rawat, B. S. [2 ]
Kumar, Piyush [2 ]
Kumar, Niraj [1 ]
Upadhyay, Sanjay [1 ]
Chetana, S. [1 ]
Gururani, Prateek [3 ]
Kimothi, Sanjeev [1 ]
机构
[1] Uttaranchal Univ Dehradun, Div Res & Innovat, Dehra Dun, India
[2] Uttaranchal Univ Dehradun, Dept Phys, Dehra Dun, India
[3] Graph Era Deemed be Univ, Dept Biotechnol, Dehra Dun 248002, India
关键词
Tectona grandis; Leaf extract; ZnO; r-GO; Adsorption; AQUEOUS-SOLUTIONS; REMOVAL; PB(II); NANOCOMPOSITES; NANOPARTICLES; CR(VI); COLUMN; WATER; IONS; LEAD;
D O I
10.1016/j.inoche.2022.110040
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The current work presents a sustainable method for the synthesis of ZnO/r-GO material using Tectona grandis leaf extract. Leaf extract was used to synthesise ZnO nanoparticles (ZnO NPs). To synthesise ZnO/r-GO, reduced graphene oxide (r-GO) and ZnO NPs were incorporated under ultrasonic conditions. The characteristic bonds onto ZnO/r-GO were identified as O-H, C--O, C-Zn, Zn-O, and others. The ZnO/r-GO was analysed using several analytical methods and has been used to eliminate hazardous Pb2+ and Cr6+ ions from contaminated water via adsorption. Maximum decontamination has been achieved through optimization. The removal of 68.3 and 60.9 % at 60 min, 67.9 and 63.9 % at 100 mg dosage, and 98 and 88.5 % at optimal pH was recorded for Pb2+ and Cr6+ ions. The adsorption equilibrium findings were validated using various isotherm and kinetic models. Pb2+ and Cr6+ had the highest adsorption capacities of 16.261 and 10.718 mg/g, respectively. The pseudo second order rate constants (k2) were found to be 2.738 and 3.415 g/mg/min for Pb2+ and Cr6+ ions. The regeneration study also revealed the potential of the ZnO/r-GO and, after the first cycle, the % removal has been found to be 77.9 and 73.2 % for Pb2+ and Cr6+ ions, respectively.
引用
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页数:12
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