Synthesis of Carboxylated Magnetic Fe3O4 Composites and Their Adsorption Behavior to Pb2+

doi:10.19491/j.issn.1001-9278.2021.10.007

Abstract

Abstract:

Fe₃O₄ magnetic particles were prepared by co?precipitation and then surface?treated through silanization and amidation reactions to obtain a carboxylated composite （Fe₃O₄?SiO₂?NH?COOH）. The structure of Fe₃O₄?SiO₂?NH?COOH， the effect of reaction condition on the Pb²⁺ adsorption of the Fe₃O₄?SiO₂?NH?COOH and its repetitive utilization efficiency was analyzed by FTIR， SEM， TEM， VSM and XRD. The results indicated that the Fe₃O₄?SiO₂?NH?COOH were successfully prepared with a desired structure and could be obtained through a rapid magnetic separation. Meanwhile， the static adsorption experiment showed that the adsorption kinetics belonged to the second order. The adsorption system reached an equilibrium with a maximum adsorbent capacity of 207.8 mg/g with a pH 4.5， a temperature of 55 ℃， a contact time of 100 min， and an Fe₃O₄?SiO₂?NH?COOH concentration of 1.0 g/L. The Langmuir equation is able to better describe the adsorption isotherm， indicating an endothermic process for the adsorption of Pb²⁺. The adsorption capacity of Fe₃O₄?SiO₂?NH?COOH toward Pb²⁺ showed an increase at first and then tended to stabilize with an increase in time. However， it increased at first and then decreased with an increase in pH. Compared to monovalent cations， the presence of divalent Ca²⁺ and Mg²⁺ in the solution could generate a certain inhibitory effect on the adsorption reaction. The Pb²⁺ removal rate was still above 50 % after regeneration of Fe₃O₄?SiO₂?NH?COOH for six times.

Key words: carboxylation, adsorption, lead ion, structure, magnetism, composite

CLC Number:

TQ317

LI Meilan, DOU Xiaoyu, HE Jiao, GONG Wei, XIE Chengcheng, LIU Bailing. Synthesis of Carboxylated Magnetic Fe₃O₄ Composites and Their Adsorption Behavior to Pb²⁺[J]. China Plastics, 2021, 35(10): 37-44.

Figures/Tables 13

Fig.1. FTIR spectra of Fe3O4?SiO2?NH?COOH

Fig.2. XRD spectra of Fe3O4?SiO2?NH?COOH

Fig.3. Magnetization curves of Fe3O4?SiO2?NH?COOH

Fig.4. SEM and TEM image of Fe3O4?SiO2?NH?COOH

Fig.5. Effect of adsorption time on adsorption capacity

Fig.6. Kinetic fitting curves of adsorption data of Pb2+ onto Fe3O4?SiO2?NH?COOH composite

Fig.7. Effect of pH on adsorption capacity

Fig.8. Effect of temperature on adsorption capacity

Fig.9. Different isothermal adsorption models of Pb2+ adsorbed by Fe3O4?SiO2?NH?COOH

Langmuir模型参数			Freundlich模型参数
模型计算出的理论平衡吸附量/mg·g^-1	K_L	R²	吸附容量参数	n	R²
229.84	0.004 42	0.957 1	46.643	5.32	0.712 7

Tab.1. Isothermal adsorption parameters of Pb2+ adsorbed by Fe3O4?SiO2?NH?COOH

Fig.10. Influence of interfering cations on adsorption effect

Fig.11. Diagram of magnetic response

Fig.12. Effect of reuse times on adsorption effect

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Synthesis of Carboxylated Magnetic Fe₃O₄ Composites and Their Adsorption Behavior to Pb²⁺

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