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Simultaneous Methylene Blue Adsorption and pH Neutralization of Contaminated Water by Rice Husk Ash

[Image: see text] In this study, the potential of rice husk ash (RHA) to act as an adsorbent for treating dye-containing wastewater was demonstrated. The RHA used in this study contained 91.7% silica, which was composed of crystalline (cristobalite and tridymite) and amorphous phases. The mechanoche...

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Autores principales: Hongo, Teruhisa, Moriura, Michiru, Hatada, Yuji, Abiko, Hironobu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8388103/
https://www.ncbi.nlm.nih.gov/pubmed/34471764
http://dx.doi.org/10.1021/acsomega.1c02833
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author Hongo, Teruhisa
Moriura, Michiru
Hatada, Yuji
Abiko, Hironobu
author_facet Hongo, Teruhisa
Moriura, Michiru
Hatada, Yuji
Abiko, Hironobu
author_sort Hongo, Teruhisa
collection PubMed
description [Image: see text] In this study, the potential of rice husk ash (RHA) to act as an adsorbent for treating dye-containing wastewater was demonstrated. The RHA used in this study contained 91.7% silica, which was composed of crystalline (cristobalite and tridymite) and amorphous phases. The mechanochemical treatment of RHA led to an increase in its specific surface area from 6.2 to 14.6 m(2)/g in 15 min and dramatically improved its methylene blue (MB) adsorption ability. Langmuir adsorption isotherms revealed that the maximum adsorption capacity of the treated RHA was 8.59 mg/g, which is 2.45 times higher than that of raw RHA. pH-dependent adsorption studies on the RHA revealed that MB was adsorbed on the deprotonated Q(3) silanol through electrostatic interactions. Moreover, the RHA adsorbent showed pH buffering at a pH value of approximately 7; thus, the pH of the solution could be neutralized simultaneously with the adsorptive removal of MB.
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spelling pubmed-83881032021-08-31 Simultaneous Methylene Blue Adsorption and pH Neutralization of Contaminated Water by Rice Husk Ash Hongo, Teruhisa Moriura, Michiru Hatada, Yuji Abiko, Hironobu ACS Omega [Image: see text] In this study, the potential of rice husk ash (RHA) to act as an adsorbent for treating dye-containing wastewater was demonstrated. The RHA used in this study contained 91.7% silica, which was composed of crystalline (cristobalite and tridymite) and amorphous phases. The mechanochemical treatment of RHA led to an increase in its specific surface area from 6.2 to 14.6 m(2)/g in 15 min and dramatically improved its methylene blue (MB) adsorption ability. Langmuir adsorption isotherms revealed that the maximum adsorption capacity of the treated RHA was 8.59 mg/g, which is 2.45 times higher than that of raw RHA. pH-dependent adsorption studies on the RHA revealed that MB was adsorbed on the deprotonated Q(3) silanol through electrostatic interactions. Moreover, the RHA adsorbent showed pH buffering at a pH value of approximately 7; thus, the pH of the solution could be neutralized simultaneously with the adsorptive removal of MB. American Chemical Society 2021-08-16 /pmc/articles/PMC8388103/ /pubmed/34471764 http://dx.doi.org/10.1021/acsomega.1c02833 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Hongo, Teruhisa
Moriura, Michiru
Hatada, Yuji
Abiko, Hironobu
Simultaneous Methylene Blue Adsorption and pH Neutralization of Contaminated Water by Rice Husk Ash
title Simultaneous Methylene Blue Adsorption and pH Neutralization of Contaminated Water by Rice Husk Ash
title_full Simultaneous Methylene Blue Adsorption and pH Neutralization of Contaminated Water by Rice Husk Ash
title_fullStr Simultaneous Methylene Blue Adsorption and pH Neutralization of Contaminated Water by Rice Husk Ash
title_full_unstemmed Simultaneous Methylene Blue Adsorption and pH Neutralization of Contaminated Water by Rice Husk Ash
title_short Simultaneous Methylene Blue Adsorption and pH Neutralization of Contaminated Water by Rice Husk Ash
title_sort simultaneous methylene blue adsorption and ph neutralization of contaminated water by rice husk ash
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8388103/
https://www.ncbi.nlm.nih.gov/pubmed/34471764
http://dx.doi.org/10.1021/acsomega.1c02833
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