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Cross-linked dithiocarbamate-modified cellulose with enhanced thermal stability and dispersibility as a sorbent for arsenite removal.
Nakakubo, Keisuke; Endo, Masaru; Sakai, Yuto; Biswas, Foni B; Wong, Kuo H; Mashio, Asami S; Taniguchi, Tsuyoshi; Nishimura, Tatsuya; Maeda, Katsuhiro; Hasegawa, Hiroshi.
Afiliação
  • Nakakubo K; Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan. Electronic address: k-nakakubo@stu.kanazawa-u.ac.jp.
  • Endo M; Daicel Corporation, 1239 Shinzaike, Aboshi-ku, Himeji-Shi, Hyogo, 671-1283, Japan. Electronic address: ms_endo@jp.daicel.com.
  • Sakai Y; Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan.
  • Biswas FB; Department of Chemistry, Faculty of Science, University of Chittagong, Chittagong, 4331, Bangladesh.
  • Wong KH; Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan.
  • Mashio AS; Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan.
  • Taniguchi T; Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan.
  • Nishimura T; Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan.
  • Maeda K; Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan.
  • Hasegawa H; Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan. Electronic address: hhiroshi@se.kanazawa-u.ac.jp.
Chemosphere ; 307(Pt 1): 135671, 2022 Nov.
Article em En | MEDLINE | ID: mdl-35842048
Numerous reports have described dithiocarbamate (DTC)-modified cellulose sorbents that can selectively separate metal ions from water. We have previously synthesized a novel sorbent modified with DTC containing N-heterocycles in the backbone for the selective removal of hazardous metal ions. The sorbent was found to partially dissolve and aggregate in solution, reducing its sorption capacity. In this study, to prepare the sorbent for use as a soli-phase extraction material for the removal of arsenite (AsIII) ions, we attempted to decrease the solubility of the sorbent. The sorbent was cross-linked with epoxy or complexed with iron, and the quantities of the modifiers were varied between 3.0 and 10 mol%. As a result, the iron-complexed sorbents were still partially soluble, and cross-linkage with 6.0 mol% of epoxy made the sorbent almost insoluble and dispersed in solution. This sorbent also exhibited the highest AsIII sorption performance among the sorbents synthesized in this study. Although DTC-modified polymers are reported to lose their sorption capability after storage at 40 °C, the sorbent was found to be thermally stable. The optimum contact time and pH for AsIII removal were 20 min and 3.0, respectively. The maximum sorption capacity of the epoxy-cross-linked sorbent, calculated from the Langmuir isotherm equation, was 600 µmol g-1 (45 mg g-1) at 25 °C. Additionally, the sorbent was highly selective toward AsIII compared with previously reported sorbents and capable of removing approximately 97% of AsIII from environmental water. In conclusion, cross-linking enhances the stability of the sorbents in solutions, which facilitates the removal of AsIII from environmental water.
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Texto completo: 1 Coleções: 01-internacional Contexto em Saúde: 2_ODS3 Base de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Arsenitos / Purificação da Água Idioma: En Revista: Chemosphere Ano de publicação: 2022 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Contexto em Saúde: 2_ODS3 Base de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Arsenitos / Purificação da Água Idioma: En Revista: Chemosphere Ano de publicação: 2022 Tipo de documento: Article