Nanofibrous Membranes for Low-Concentration CrVI Adsorption: Kinetic, Thermodynamic and the Influence on ZFL Cells Viability

Author(s)

Guilherme Dognani ^[1] ; Flávio Camargo Cabrera ; Dalita Gomes Silva Morais Cavalcante ^[3] ; Rosane Freire Boina ^[4] ; Aldo Eloízo Job ^[5] ; Deuber Lincon da Silva Agostini ^[6]

Affiliation

^[1] Universidade Estadual Paulista. Faculdade de Ciências e Tecnologia - Brasil

^[3] Universidade Estadual Paulista. Faculdade de Ciências e Tecnologia - Brasil

^[4] Universidade Estadual Paulista. Faculdade de Ciências e Tecnologia - Brasil

^[5] Universidade Estadual Paulista. Faculdade de Ciências e Tecnologia - Brasil

^[6] Universidade Estadual Paulista. Faculdade de Ciências e Tecnologia - Brasil

• Document type: Journal article
• Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 24, 2021-07-12.

Abstract

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 ( Q e= 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. (AU)

• FAPESP's process: 16/06288-4 - DEVELOPMENT OF CONDUCTIVE POLYMER NANOFIBER OBTAINED BY ELECTROSPINNING FOR APPLICATION IN SENSORS AND HETEROJUNCTION
• Grantee: Deuber Lincon da Silva Agostini
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/03638-7 - Study of flux, permeability, fouling and metal removal capacity of PVDF membranes with functionalized surface
• Grantee: Guilherme Dognani
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 15/21261-2 - Development of water pre-filters from PVDF electrospun membranes with functionalized surface for adsorption of CR6+
• Grantee: Guilherme Dognani
• Support Opportunities: Scholarships in Brazil - Doctorate