Influence of alginate fixation on the adsorption capacity of hydroxyapatite nanocrystals to Cu2+ ions

被引：35
作者：
Guo, Jiali [1 ]
Han, Yingchao [1 ]
Mao, Yuting [1 ]
Wickramaratne, M. Nirmali [2 ]
机构：
[1] Wuhan Univ Technol, Biomed Mat & Engn Res Ctr Hubei, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China
[2] Sabaragamuwa Univ Sri Lanka, Fac Appl Sci, Belihuloya 70140, Sri Lanka
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2017年 / 529卷
关键词：
Nano hydroxyapatite; Alginate fixation; Composite; Heavy metal ions; Adsorption; HEAVY-METALS; REMOVAL; LEAD; SORPTION; BEADS; COPPER(II); COMPOSITE; CADMIUM; PB(II); ZINC;
D O I：
10.1016/j.colsurfa.2017.06.075
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：
Nano-hydroxyapatite (HAP) can be used as an environmentally friendly adsorbent of heavy metal ions. However, the agglomeration and precipitation of nano-HAP will result in the loss of adsorption capacity to heavy metal ions. Herein, the stable nano-HAP suspension was synthesized with the stabilization effect of polyacrylic acid and further fixed by alginate to form nano-HAP-alginate composite. The effect of alginate fixation on the adsorption capacity of nano-HAP to Cu2+ ions was studied. Results showed that the adsorption capacity to Cu2+ ions of alginate fixed nano-HAP was depended on the mass ratio of nano-HAP to alginate. With the increase of mass ratio of nano-HAP to alginate from 5: 95 to 95: 5, the displayed adsorption capacity of nano-HAP to Cu2+ ions was gradually decreased due to the increasing agglomeration of nano-HAP. Especially, while the mass ratio of nano-HAP to alginate was at 5: 95-10: 90, the nano-HAP was fixed in alginate with single-particle distribution, showing adsorption capacity comparable to that of nano-HAP suspension (60.99 mg g(-1)). The adsorption of Cu2+ on nano-HAP was attributed to Langmuir isotherm model (monolayer sorption). After fixation by alginate, the resulting nano-HAP-alginate (50:50) composite showed the adsorption to Cu2+ followed both the Langmuir and Freundlich isotherm models, indicating the multilayer sorption of Cu2+ on heterogeneous surface. Accordingly, the alginate fixation is an alternative way for nano-HAP as adsorbent of heavy metal ions.
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收藏
页码：801 / 807
页数：7
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