黄原胶基磁性多孔生物碳的制备及其对溶液中Cr(Ⅵ)的吸附特性研究
李盼禹 , 荣勉 , 王丽会 , 朱姝 , 张永奎
现代化工 ›› 2026, Vol. 46 ›› Issue (4) : 184 -190.
黄原胶基磁性多孔生物碳的制备及其对溶液中Cr(Ⅵ)的吸附特性研究
Preparation of xanthan gum-based magnetic porous biochar and its adsorption properties for Cr(Ⅵ) in aqueous solution
采用黄原胶为原料,通过铁浸渍-KOH活化法制备磁性多孔生物碳(MC-K),用于吸附水中Cr(Ⅵ)。结果表明,溶液pH升高会降低吸附容量,常见的共存阴离子会对Cr(Ⅵ)的去除带来不利影响。静电吸引和还原反应是MC-K去除Cr(Ⅵ)的主要机制,经KOH活化后,MC-K比表面积明显增加,部分Fe3O4被还原为FeO和零价铁,赋予材料更强的还原能力,对 Cr(Ⅵ)的去除能力显著提升,最大吸附容量为91.91 mg/g。MC-K具有良好磁性,易于回收,是一种高效、易分离的铬吸附材料,在水环境除铬领域具有较好的应用潜力。
Magnetic porous biochar (MC-K) was prepared by using xanthan gum as raw material through the iron impregnation-KOH activation method for the adsorption of Cr(Ⅵ) in water.The results showed that an increase in solution pH reduced the adsorption capacity,and common coexisting anions had adverse effects on Cr(Ⅵ) removal.Electrostatic attraction and reduction reactions were identified as the primary mechanisms for Cr(Ⅵ) removal by MC-K.After KOH activation,the specific surface area of MC-K significantly increased and partial Fe3O4 was reduced to FeO and Fe0,which endowed the material with enhanced reducing capacity and significantly improved Cr(Ⅵ) removal capability,with a maximum adsorption capacity of 91.91 mg/g.Furthermore,MC-K exhibits good magnetism,allowing easy recovery,making it an efficient and readily separable adsorbent for chromium removal,demonstrating promising application potential for chromium removal in water environments.
xanthan gum-based magnetic biochar / reduction / adsorption / hexavalent chromium / magnetism
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