Synthesis and Characterization of Magnetic Xerogel Monolith as an Adsorbent for As(V) Removal from Groundwater

Processes

Prócoro Gamero-Melo¹  Sasirot Khamkure²  Audberto Reyes-Rosas³  SofíaEsperanza Garrido-Hoyos⁴ 

[1] CINVESTAV IPN-Unidad Saltillo, Ramos Arizpe, Coahuila 25900, Mexico;CONACyT-Instituto Mexicano de Tecnología del Agua, Jiutepec, Morelos 62550, Mexico;Centro de Investigación en Ciencias-IICBA. Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos 62209, Mexico;Instituto Mexicano de Tecnología del Agua, Jiutepec, Morelos 62550, Mexico;

关键词: adsorption;    arsenic removal;    groundwater;    magnetic;    xerogel;   

DOI  :  10.3390/pr9020386

来源: DOAJ

【 摘 要 】

Arsenic contamination of groundwater is still a global problem due to the toxicity at low dose on human health confirmed by epidemiological studies. Magnetic xerogel monoliths (MXs) were synthesized by the sol-gel polymerization using resorcinol, formaldehyde, alkaline catalyst and magnetite. The varying molar ratios of magnetite and resorcinol (M/R) in the gel were evaluated for As(V) removal from groundwater. The surface chemistry, structure and morphology of MXs related to arsenic adsorption were characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy and point of zero charge. Batch adsorption experiments were carried out to investigate the effects of Fe contents, initial pH and adsorbent dose on As(V) removal performance. The MXs with molar ratio of M/R at 0.15 gave the maximum As(V) adsorption capacity and removal with values of 62.8 µg/g and 86.7%, respectively. The adsorption data were well described by the Elovich equation of the kinetic model and the Freundlich isotherm. The thermodynamic studies demonstrated that the adsorption process was endothermic and spontaneous in nature. MXs showed to be a good alternative for As(V) removal from groundwater and achieving the efficient desorption, and thus fulfilled the Mexican standard for drinking water.

【 授权许可】

Unknown