Fabrication of the composite sepiolite@polyethyleneimine/sodium alginate and its excellent adsorption performance for heavy metal ions

被引:31
作者
Wu, Xiaoqiong [1 ]
Song, Yutong [1 ]
Yin, Ping [1 ]
Xu, Qiang [1 ]
Yang, Zhenglong [1 ]
Xu, Yanbin [1 ]
Liu, Xiguang [1 ]
Wang, Ying [1 ]
Sun, Wenjuan [1 ]
Cai, Honglan [1 ]
机构
[1] Ludong Univ, Sch Chem & Mat Sci, Yantai 264025, Peoples R China
基金
中国国家自然科学基金;
关键词
Heavy metal ions adsorption; Composite; Sepiolite; Polyethyleneimine; Sodium alginate; AQUEOUS-SOLUTION; COPPER II; CU(II); EQUILIBRIUM; KINETICS; REMOVAL; CD(II); PB(II); BEADS; SINGLE;
D O I
10.1016/j.clay.2022.106647
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In order to explore more excellent heavy metal adsorbents with clay mineral sepiolite (Sep), this work was carried out and presented the novel design and fabrication processes of the composite Sep@polyethyleneimine/sodium (SEP@PEI/SA), which were characterized by SEM, EDX, FT-IR, XPS, TGA, and porous analysis, and were efficiently utilized for heavy metal ions adsorption. The adsorption properties of SEP@PEI/SA for Pb(II), Cu(II), Au(III), Ag(I), Pd(IV), Pt(IV), Hg(II), Cr(VI), Cr(III), Co(II), Zn(II), and Ni(II) were investigated, and it was employed to remove lead ions from the simulated lead-containing industrial wastewater through adsorption method. The adsorption properties of lead ions on SEP@PEI/SA were thoroughly investigated in this study, and the results demonstrated that the adsorption kinetics of SEP@PEI/SA for lead ions at different temperatures could be modeled closely by a pseudo second-order rate equation, Langmuir isotherm model was the best fit one and the maximum adsorption capacity was could reach 1094.86 mg/g at 25 degrees C. Adsorption thermodynamic parameters, standard Gibbs free energy (Delta G degrees), enthalpy (Delta H degrees) and entropy (Delta S degrees) changes, were -6.29 KJ.mol(-1) (35 degrees C), 30.81 KJ.mol(-1), 0.12 KJ.(K.mol)(-1), respectively, suggesting the spontaneous and endothermic nature of the adsorption process with the increase of the randomness. All these research work results showed that the novel adsorbent SEP@PEI/SA has promising potential to removal lead ions from water body efficiently.
引用
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页数:16
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