Abstract
There is a great demand to develop different techniques for the continuous removal, immobilization, and remediation of metallic ions from contaminated water. Human contamination by metallic ions could even occur by ingestion of seafood causing carcinogenic and mutagenic activities. In this study, a nanofibrous membrane of poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) produced by electrospinning technique and coated with polyaniline (PAni) was tested for the removal of chromium in low-concentration solutions. The viability of ZFL cells (zebrafish liver cells) was performed to evaluate the water quality enhancement after chromium adsorption. The results indicated that the nanofibrous membrane successfully adsorbed the chromium species in low-concentration (Qe= 2.44 mg/g, at pH 4.5, room temperature (RT) and 24h) by Freundlich model and followed a pseudo-second-order kinetics model indicating a possible chemisorption in multilayers, at pH 4.5, RT and [CrVI] = 5.0 mg/L. At pH 2.0 (24h, RT and [CrVI] = 5.0 mg/L), the membrane adsorbed around 91.64% of CrVI contaminants. The thermodynamic studies revealed that the process was spontaneous and exothermic. The cells viability demonstrated the efficiency of the membrane tested in the aquatic ecosystem protection; the viability increased 19.2% in 5.0 mg/L CrVI solution. Thus, the results of this study shows that the nanofibrous membrane can be an alternative to remove low concentration of CrVI from aqueous solutions.
Highlights
The world progress has brought comfort for people, making the life easy, developing new materials and process, which can be used day by day
Nanofibrous Membranes for Low-Concentration CrVI Adsorption: Kinetic, Thermodynamic and the Influence on ZFL Cells Viability where k0 is the constant of thermodynamic equilibrium, R is the universal gas constant (8.314 J mol-1 K-1), T is absolute temperature (K), CAe and Ce are the concentration of chromium on the adsorbent and in solution, respectively[28]
The results demonstrated that Freundlich Isotherm Model can better describe the adsorption process with a higher R2, which suggests a multilayer adsorption of chromium ions on the membrane, with non-uniform distribution on a heterogeneous surface[38]
Summary
The world progress has brought comfort for people, making the life easy, developing new materials and process, which can be used day by day. With this progress, some disadvantages come together, such as improper waste disposal of solid and liquid materials containing many contaminants[1,2]. We have recently introduced the design concept of electrospinning PVDF-HFP/PAni membranes for high concentration of chromium removal from aqueous medium[21] as well as the good desorption efficiency of these membranes. We optimize the use of nanofibrous membrane of PAni-coated electrospun PVDF-HFP nanofibers in lowconcentration hexavalent chromium removal from aqueous solutions simulating an industrial effluent released into the environment. Materials Research efficiency of electrospun membranes in the purification of water from chromium
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