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Hierarchical C/NiO-ZnO nanocomposite fibers with enhanced adsorption capacity for Congo red
- Chen, Hua, Wageh, S., Al-Ghamdi, Ahmed A., Wang, Hongyang, Yu, Jiaguo, Jiang, Chuanjia
- Journal of colloid and interface science 2019 v.537 pp. 736-745
- adsorbents, adsorption, air, carbon, carbon fibers, coprecipitation, dyes, macropores, microparticles, nanocomposites, nanosheets, nickel, nickel oxide, oils, pH, sorption isotherms, surface area, wastewater, zinc oxide
- Wastewater containing organic dyestuff has caused worldwide concern, hence, it is imperative to develop materials to remove organic dyes from wastewater. Herein, we report the synthesis of carbon fiber-based bimetallic oxide nanocomposite with high efficiency for the adsorptive removal of Congo red (CR), a typical anionic dye. Composite nanosheets of nickel(II) oxide (NiO) and zinc oxide (ZnO) were in situ grown over electrospun carbon fibers via one-step oil bath coprecipitation and subsequent calcination in air at 350 °C. The C/NiO-ZnO nanocomposite fibers exhibited fast adsorption rates towards CR at circumneutral pH, and maximal adsorption capacity according to the Langmuir model reached 613 mg g−1, much higher than aggregated NiO-ZnO microspheres and the carbon fiber alone. The high adsorption capacity of the C/NiO-ZnO nanocomposite was attributed to its high specific surface area (222 m2 g−1), hierarchically porous structure with abundant mesopores and macropores, and the positive surface charge at circumneutral pH. Therefore, the flexible and easily recyclable C/NiO-ZnO nanocomposite fibers can become an alternative adsorbent for the treatment of anionic dye wastewater.