Adsorption of Hexavalent Chromium by Sodium Alginate Fiber Biochar Loaded with Lanthanum

Materials

Yuanyuan Sun¹  Yuqian Cui¹  Xinzhe Sun¹  Peng Guo² 

[1] College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China;School of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China;

关键词: wet spinning;    lanthanum oxide;    biochar;    chromate;    adsorption;   

DOI  :  10.3390/ma14092224

来源: DOAJ

【 摘 要 】

Lanthanun oxide (La₂O₃) is a lanthanum chemical compound incorporates a sensible anionic complexing ability; however, it lacks stability at a low pH scale. Biochar fibers will give the benefit of their massive space and plethoric uses on the surface to support a metal chemical compound. Herein, wet spinning technology was used to load La³⁺ onto sodium alginate fiber, and to convert La³⁺ into La₂O₃ through carbonization. The La₂O₃-modified biochar (La-BC) fiber was characterized by SEM, XRD and XPS, etc. An adsorption experiment proved that La-BC showed an excellent adsorption capacity for chromates, and its saturation adsorption capacity was about 104.9 mg/g. The information suggested that the adsorption was in step with both the Langmuir and Freundlich models, following pseudo-second-order surface assimilation mechanics, which showed that the Cr (VI) adsorption was characterized by single-phase and polyphase adsorption, mainly chemical adsorption. The thermodynamic parameters proved that the adsorption process was spontaneous and endothermic. The mechanistic investigation revealed that the mechanism of the adsorption of Cr (VI) by La-BC may include electrostatic interaction, ligand exchange, or complexation. Moreover, the co-existing anions and regeneration experiments proved that the La-BC is recyclable and has good prospects in the field of chrome-containing wastewater removal.

【 授权许可】

Unknown