改性果胶-Fe3O4磁性微球制备及对Pb 2+吸附性能

doi:10.11962/1006-4990.2019-0435

Abstract

Abstract:

A new magnetic microspheres adsorbent of pectin modified by succinic anhydride was synthesized.The sampleswere characterized by means of SEM,FT-IR and XRD.The effects of the adsorbent adsorbing Pb ²⁺ were investigated.The ex-perimental results showed that the magnetic microspheres of succinic anhydride modified pectin-Fe₃O₄ were prepared successfully.The modified pectin coated Fe₃O₄ hardly changed the original structure of Fe₃O₄ spinel,and its surface became loose and porous and the adsorption of lead ions by the novel magnetic microspheres with succinic anhydride modified pectin was characterized by pseudo-second-order kinetic and Langmuir isothermal adsorption equation and the adsorption process was mainly chemical adsorption.The optimal conditions were as follows：adsorption time of 600 min,the temperature of 40 ℃,the pH=5,the adsorption dosage of 20 mg,and the solution Pb ²⁺ mass concentration of 800 mg/L.The adsorbent was used to remove Pb ²⁺ from the enzymatic hydrolysate of tegillarca granosa and scallop,with the removal rates of 76.47% and 80.34%,respectively.The effect is good.

Key words: modified pectin-Fe₃O₄ magnetic microspheres, succinic anhydride, adsorption

CLC Number:

TQ138.11

Hu Dongwan,Ma Zhanling,Ma Xiao,Li Jianrong. Preparation of modified Fe₃O₄-pectin magnetic microspheres and its adsorption property for Pb ²⁺[J]. Inorganic Chemicals Industry, 2020, 52(6): 24-29.

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References 15

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准一级动力学模型	准二级动力学模型	粒内扩散模型
k₁=5.066 6×10^-3	k₂=1.049 5×10^-3	k_p=0.863 7
R²=0.737 8	R²=0.999 4	R²=0.653 6
	q_e,cal=64.52 mg/g	C=40.721 3

Langmuir方程	Freundlich方程
q_m=94.34	k_F=3.96
k_L=7.699 0×10^-3	n=2.24
R²=0.994 3	R²=0.9587

样品	酶解液ρ（Pb²⁺）/ （μg·mL^-1）	吸附液ρ（Pb²⁺）/ （μg·mL^-1）	Pb²⁺去除率/ %
毛蚶子	1.36	0.32	76.47
扇贝	1.17	0.23	80.34

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Preparation of modified Fe₃O₄-pectin magnetic microspheres and its adsorption property for Pb ²⁺

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Preparation of modified Fe3O4-pectin magnetic microspheres and its adsorption property for Pb 2+