Synthesis and characterization of ZnO:CeO2: nanocellulose:PANI bionanocomposite. A bimodal agent for arsenic adsorption and antibacterial action

摘要

In the present study we report the generation of a bimodal, ZnO:CeO2:nanocellulose:polyaniline bio-nanocomposite having an appreciable remediation efficiency for dissolved Arsenic along with a noticeable antibacterial activity. The microstructural analysis of the synthesized bionanocomposite was carried out by TEM, XRD and FTIR studies, which confirmed the incorporation of the nanoscaled ZnO and CeO2 in the polymeric nanocellulose:polyaniline matrix. The bionanocomposite exhibited a remediation efficiency above similar to 95% against As under different adsorbent concentrations and pH conditions. The biosorption mechanism of As on the nanobiosorbent was found to conform to the Freundlich and Dubinin-Radushkevich isotherms. Antibacterial assays for the bionanocomposite showed a high antibacterial activity with MIC50 values of 10.6 mu g ml(-1) against the Gram-positive Bacillus subtilis and 10.3 mu g ml(-1) against the Gram-negative Escherichia coli. Thus, the bionanocomposite shall be of high interest as a novel and sustainable matrix for the design of coats/devices that effectuate arsenic adsorption and microbial control, to generate contaminant free potable water. (C) 2016 Elsevier Ltd. All rights reserved.