Add time:08/11/2019         Source:sciencedirect.com

This study investigates the arsenic(V) removal capacities of composite adsorbents made of silicate flakes of zirconium oxide and titanium oxide nanoparticles, which are then coated onto alumina tubes as an alternative method for arsenic(V) removal. As part of the study, the adsorption isotherms, interference of coexisting ions, stability of adsorbents and recovery of arsenic(V) were examined. The adsorbent containing zirconium oxide reveals a quite fast adsorption; through which 92% of the arsenic(V) was removed within 5 min. The both adsorbents containing zirconium oxide and titanium oxide reveal good stability and removal performance at neutral pH. The both adsorbents were arsenic(V) selective in presence of coexisting anions; however, the adsorbent containing zirconium oxide exhibits higher selectivity for arsenic(V) in presence of cations. The adsorption capacities were found to be 1.2 mmol g−1 (305 mg g−1) for zirconium oxide and 0.5 mmol g−1 (125 mg g−1) for titanium oxide, and finally 0.52 mmol g−1 (129 mg g−1) for zirconium oxide in case of tube-coating. The test results indicate that, although the both adsorbents are suitable for arsenic(V) removal, the adsorbent containing zirconium oxide has superior properties owing to its rapid adsorption, higher capacity and selectivity. Additionally, it is demonstrated that coating alumina tubes with adsorbents could serve as an alternative method for arsenic(V) removal.

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