Abstract
Chromium is a toxic and carcinogenic heavy metal that originates from various human activities. Therefore, the effective removal of chromium from aqueous solutions is an extremely important global challenge. Herein, we report a chitosan-coated iron oxide nanoparticle immobilized hydrophilic poly(vinylidene) fluoride membrane (Chi@Fe2O3–PVDF) which can potentially be used for efficient removal of hexavalent chromium(VI) by a simple filtration process. Membrane filtration is an easy and efficient method for treating large volumes of water in a short duration. The adsorption experiments were conducted by batch and continuous in-flow systems. The experimental data showed rapid capture of hexavalent chromium (Cr(VI)) which can be explained by the pseudo-second-order kinetic and Langmuir isotherm model. The nanocomposite membrane exhibited high adsorption capacity for Cr(VI) (14.451 mg/g in batch system, 14.104 mg/g in continuous in-flow system). Moreover, its removal efficiency was not changed significantly in the presence of several competing ions, i.e., Cl−, NO3−, SO42−, and PO43−. Consequently, the Chi@Fe2O3-PVDF-based filtration process is expected to show a promising direction and be developed as a practical method for wastewater treatment.
Highlights
Environmental pollution caused by leakage of heavy metals is a serious problem worldwide [1,2]
Using a vacuum filtration system, 2.2 mg chitosancoated iron oxide nanoparticles were stably immobilized on the membrane, which exhibited a homogeneous and yellow-brown color
These materials have been applied in the batch system for removal of target metal ions and the metal-containing adsorbents should be recovered from water after the purification procedure was accomplished
Summary
Environmental pollution caused by leakage of heavy metals is a serious problem worldwide [1,2]. Chromium is a toxic heavy metal that commonly exists in wastewater produced during steel manufacturing, leather tanning, and so on. Hexavalent chromium (Cr(VI)) (e.g., HCrO4 − ) is generated in the process of various industrial processes and is 500 times more toxic than trivalent Cr(III), which is present in nature [3]. This metal species can be generated in the chemical decontamination procedure for removal of the oxide layer deposited in the primary system of a nuclear power plant. An efficient method for desalination of hexavalent chromium from wastewater is necessary
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
