Fabrication and characterization of novel polyvinylidene fluoride ultrafiltration membranes for separation of Cr(VI) from wastewater

Abstract

Hexavalent chromium is one of the major heavy metals. As the environmental legislation becomes increasingly strict, looking for new technology to treat hexavalent chromium is becoming more and more important. In this research, 2-mercaptobenzothiazole was used to blend polyvinylidene fluoride to prepare a modified membrane that could be applied to adsorb and purify water containing hexavalent chromium. The membrane performance was characterized by infrared spectroscopy (Fourier transform infrared spectroscopy) and water contact angle measurements. The experimental results showed that the pure water flux of the membrane was 255.57 l/m 2 h, the contact angle was 80.1 , and the adsorption capacity of chromium ion was 241 mg/cm 2 . The polyvinylidene fluoride-modified membrane presented better adsorption abilities for chromium ion than that of the traditional polyvinylidene fluoride membrane.

The Adsorption of Heavy Metal Ions by Poly (Amidoamine) Dendrimer-Functionalized Nanomaterials: A Review

“…Biomacromolecules are increasingly being purified by membrane separation [ 77 , 78 ]. In addition, membrane separation technology is important for water treatment due to its ease of operation, its high adsorption efficiency, and its reusability [ 79 , 80 ]. Generally, polyvinylidene fluoride (PDVF) is the most widely used membrane material due to its excellent mechanical strength, thermal stability, acid and alkali resistance, and low cost [ 81 ].…”

Heavy metals rejection from water by CMC complexation- PVDF ultrafiltration system: Box-Behnken design optimization

“…To address the aforementioned issue, polymeric membranes, including PVDF, are usually incorporated with functional groups such as amine and carboxyl groups, which effectively bind with the heavy metals and thus improve the ux rate and reduce the rejection rate of metallic ions [26]. For instance, Zhao et al blended commercially obtained PVDF membranes with 2-mercaptobenzothiazole, which has adsorption a nity for chromium (Cr) ions due to its C-H and H-C-H functional groups [27]. The prepared ultra ltration membrane was able to exhibit a superior adsorption capacity of 241 µg/cm 2 for Cr ions removal [27].…”

“…For instance, Zhao et al blended commercially obtained PVDF membranes with 2-mercaptobenzothiazole, which has adsorption a nity for chromium (Cr) ions due to its C-H and H-C-H functional groups [27]. The prepared ultra ltration membrane was able to exhibit a superior adsorption capacity of 241 µg/cm 2 for Cr ions removal [27]. Carboxymethyl cellulose is another complexing agent that is known to signi cantly increase adsorptive capability for the removal of heavy metals owing to its abundant functional groups and tendency to form chemical complexes [28,29].…”