Synthesis and Characterization of Magnetic Xerogel Monolith as an Adsorbent for As(V) Removal from Groundwater
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 va...
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Published in | Processes Vol. 9; no. 2; p. 386 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
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01.02.2021
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Abstract | 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. |
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AbstractList | 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. |
Author | Gamero-Melo, Prócoro Reyes-Rosas, Audberto Garrido-Hoyos, Sofía Esperanza Khamkure, Sasirot |
Author_xml | – sequence: 1 givenname: Sasirot surname: Khamkure fullname: Khamkure, Sasirot – sequence: 2 givenname: Sofía Esperanza surname: Garrido-Hoyos fullname: Garrido-Hoyos, Sofía Esperanza – sequence: 3 givenname: Prócoro orcidid: 0000-0001-6733-2032 surname: Gamero-Melo fullname: Gamero-Melo, Prócoro – sequence: 4 givenname: Audberto surname: Reyes-Rosas fullname: Reyes-Rosas, Audberto |
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CitedBy_id | crossref_primary_10_1016_j_rineng_2022_100553 crossref_primary_10_1016_j_jhazmat_2021_126299 crossref_primary_10_1016_j_wse_2022_07_001 crossref_primary_10_1016_j_cej_2021_129909 crossref_primary_10_1016_j_ijbiomac_2024_131078 crossref_primary_10_2166_ws_2021_429 |
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