Dithiocarbamate-modified cellulose resins: A novel adsorbent for selective removal of arsenite from aqueous media

Publication date: Available online 6 July 2019Source: Journal of Hazardous MaterialsAuthor(s): Keisuke Nakakubo, Hiroshi Hasegawa, Mikiya Ito, Kazuki Yamazaki, Maho Miyaguchi, Foni B. Biswas, Tomoyuki Ikai, Katsuhiro MaedaAbstractWe synthesized three new dithiocarbamate (DTC)-modified cellulose biomaterials (DMC-1, DMC-2, and DMC-4) to investigate their adsorption capabilities as mitigators of arsenite (AsIII) in aqueous media. The main novelty of the adsorbents was that, among two inorganic species of arsenic, arsenite and arsenate (AsV), DMCs were highly selective to AsIII in the pH range 2–7. The surface areas of the adsorbents were unified by supporting the DMCs on silica gel (designated SSDMC-1, SSDMC-2, and SSDMC-4, respectively) to investigate the effect of the length of the alkyl chains connecting cellulose and DTC groups on AsIII adsorption. The Langmuir model showed a good regression coefficient (R2> 0.96), and the isotherm results revealed that longer chains might enhance the AsIII capture ability. The adsorbents were also capable of removing various heavy metals, and the coexisting ions, FeIII, MnII, PbII, and ZnII, had no significant impact on the removal of AsIII by the DMCs. Moreover, DMC-2 could remove 98.4 ± 0.1% of AsIII from artificially contaminated river water.Graphical abstract
Source: Journal of Hazardous Materials - Category: Environmental Health Source Type: research