新型Fe<sub>3</sub>O<sub>4</sub>@SA/La复合凝胶微球的制备及吸附性能

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Abstract A novel magnetic lanthanum alginate gel composite microspheres (Fe₃O₄@SA/La) were prepared by aqueous solution reaction method with the addition of sodium alginate (SA), Fe₃O₄ and La(Ⅲ) ions. The morphology and structures of Fe₃O₄@SA/La were characterized by scanning electron microscope (SEM), X ray diffraction (XRD) and fourier transform infrared spectroscopy (FT-IR). The effects of pH, adsorption time and temperature on the adsorbent properties of Fe₃O₄@SA/La for direct red brown RN (DRB RN) and direct deep brown 2M (DDB 2M) were investigated. The results indicated that Fe₃O₄@SA/La shown high adsorbability to both DDB 2M and DRB RN at room temperature, when the amount of adsorbent was 0.1g, in natural pH. Adsorption equilibrium could be reached in 120min, where the adsorption capacity of Fe₃O₄@SA/La for DDB 2M and DRB RN could reached up 678 and 688mg/g, respectively. The adsorption process and the isothermal adsorption were in accordance with pseudo-second-order adsorption kinetic equation and the Freundlich model. The adsorption thermodynamic parameters (ΔG<0, ΔH<0, ΔS>0) indicated that the adsorption reactions of two dyes on Fe₃O₄@SA/La were spontaneous exothermic reactions with increased degree of confusion.

Key words： sodium alginate La (Ⅲ) ions magnetic adsorbent direct dye adsorption

Received: 22 January 2019

PACS:

X703

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	FENG Yan-xia
	LI Bei-gang

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FENG Yan-xia,LI Bei-gang. Preparation and adsorption properties of novel Fe₃O₄@SA/La gel composite microspheres[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3286-3292.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I8/3286

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