Cargando…

Adsorption Characteristics of Dimethylated Arsenicals on Iron Oxide–Modified Rice Husk Biochar

In this study, the adsorption characteristics of dimethylated arsenicals to rice husk biochar (BC) and Fe/biochar composite (FeBC) were assessed through isothermal adsorption experiments and X-ray absorption spectroscopy analysis. The maximal adsorption capacities (q(m)) of inorganic arsenate, calcu...

Descripción completa

Detalles Bibliográficos
Autores principales: Yoon, Sang-Gyu, Kwak, Ihn-Sil, Yoon, Hye-On, An, Jinsung
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9692524/
https://www.ncbi.nlm.nih.gov/pubmed/36422911
http://dx.doi.org/10.3390/toxics10110703
_version_ 1784837288272855040
author Yoon, Sang-Gyu
Kwak, Ihn-Sil
Yoon, Hye-On
An, Jinsung
author_facet Yoon, Sang-Gyu
Kwak, Ihn-Sil
Yoon, Hye-On
An, Jinsung
author_sort Yoon, Sang-Gyu
collection PubMed
description In this study, the adsorption characteristics of dimethylated arsenicals to rice husk biochar (BC) and Fe/biochar composite (FeBC) were assessed through isothermal adsorption experiments and X-ray absorption spectroscopy analysis. The maximal adsorption capacities (q(m)) of inorganic arsenate, calculated using the Langmuir isotherm equation, were 1.28 and 6.32 mg/g for BC and FeBC, respectively. Moreover, dimethylated arsenicals did not adsorb to BC at all, and in the case of FeBC, q(m) values of dimethylarsinic acid (DMA(V)), dimethylmonothioarsinic acid (DMMTA(V)), and dimethyldithioarsinic acid (DMDTA(V)) were calculated to be 7.08, 0.43, and 0.28 mg/g, respectively. This was due to the formation of iron oxide (i.e., two-line ferrihydrite) on the surface of BC. Linear combination fitting using As K-edge X-ray absorption near edge structure spectra confirmed that all chemical forms of dimethylated arsenicals adsorbed on the two-line ferrihydrite were DMA(V). Thus, FeBC could retain highly mobile and toxic arsenicals such as DMMTA(V) and DMDTA(V)) in the environment, and transform them into DMA(V) with relatively low toxicity.
format Online
Article
Text
id pubmed-9692524
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-96925242022-11-26 Adsorption Characteristics of Dimethylated Arsenicals on Iron Oxide–Modified Rice Husk Biochar Yoon, Sang-Gyu Kwak, Ihn-Sil Yoon, Hye-On An, Jinsung Toxics Article In this study, the adsorption characteristics of dimethylated arsenicals to rice husk biochar (BC) and Fe/biochar composite (FeBC) were assessed through isothermal adsorption experiments and X-ray absorption spectroscopy analysis. The maximal adsorption capacities (q(m)) of inorganic arsenate, calculated using the Langmuir isotherm equation, were 1.28 and 6.32 mg/g for BC and FeBC, respectively. Moreover, dimethylated arsenicals did not adsorb to BC at all, and in the case of FeBC, q(m) values of dimethylarsinic acid (DMA(V)), dimethylmonothioarsinic acid (DMMTA(V)), and dimethyldithioarsinic acid (DMDTA(V)) were calculated to be 7.08, 0.43, and 0.28 mg/g, respectively. This was due to the formation of iron oxide (i.e., two-line ferrihydrite) on the surface of BC. Linear combination fitting using As K-edge X-ray absorption near edge structure spectra confirmed that all chemical forms of dimethylated arsenicals adsorbed on the two-line ferrihydrite were DMA(V). Thus, FeBC could retain highly mobile and toxic arsenicals such as DMMTA(V) and DMDTA(V)) in the environment, and transform them into DMA(V) with relatively low toxicity. MDPI 2022-11-17 /pmc/articles/PMC9692524/ /pubmed/36422911 http://dx.doi.org/10.3390/toxics10110703 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Yoon, Sang-Gyu
Kwak, Ihn-Sil
Yoon, Hye-On
An, Jinsung
Adsorption Characteristics of Dimethylated Arsenicals on Iron Oxide–Modified Rice Husk Biochar
title Adsorption Characteristics of Dimethylated Arsenicals on Iron Oxide–Modified Rice Husk Biochar
title_full Adsorption Characteristics of Dimethylated Arsenicals on Iron Oxide–Modified Rice Husk Biochar
title_fullStr Adsorption Characteristics of Dimethylated Arsenicals on Iron Oxide–Modified Rice Husk Biochar
title_full_unstemmed Adsorption Characteristics of Dimethylated Arsenicals on Iron Oxide–Modified Rice Husk Biochar
title_short Adsorption Characteristics of Dimethylated Arsenicals on Iron Oxide–Modified Rice Husk Biochar
title_sort adsorption characteristics of dimethylated arsenicals on iron oxide–modified rice husk biochar
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9692524/
https://www.ncbi.nlm.nih.gov/pubmed/36422911
http://dx.doi.org/10.3390/toxics10110703
work_keys_str_mv AT yoonsanggyu adsorptioncharacteristicsofdimethylatedarsenicalsonironoxidemodifiedricehuskbiochar
AT kwakihnsil adsorptioncharacteristicsofdimethylatedarsenicalsonironoxidemodifiedricehuskbiochar
AT yoonhyeon adsorptioncharacteristicsofdimethylatedarsenicalsonironoxidemodifiedricehuskbiochar
AT anjinsung adsorptioncharacteristicsofdimethylatedarsenicalsonironoxidemodifiedricehuskbiochar