A global pollutant (PVC-polyvinyl chloride) applied as heavy metal binder from aqueous samples: green principles from synthesis to application

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Silva, Adrielli C. P. ; Jorgetto, Alexandre O. ; Wondracek, Marcos H. P. ; Saeki, Margarida J. ; Pedrosa, Valber A. ; Colmenares, Yormary N. ; Mastelaro, Valmor R. ; Sutili, Felipe K. ; Martines, Marco A. U. ; Pasta, Paula C. ; Castro, Gustavo R.

• Document type: Journal article
• Source: ENVIRONMENTAL TECHNOLOGY; v. 43, n. 24, p. 13-pg., 2021-06-05.

Abstract

We have developed a clean route for the modification of polyvinylchloride surface (PVC) with 4-amino-5-hydrazino-1,2,4-triazole-3-thiol molecule. The modification reaction was investigated through Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS) analysis. According to our findings, S-H groups are responsible to the molecule attachment and nitrogen atoms are directly involved in metal ion coordination. These results are in agreement with the pseudo-second-order kinetic model, which infers that chemisorption is the main mechanism for metal removal. Adsorption isotherms of Cd(II), Cu(II) and Pb(II) follow the Langmuir model and the results indicated that N-s values are 0.39, 0.52 and 0.15 mmol g(-1), respectively. The calculated o(max) values for Cu(II), Pb(II) and Cd(II) were 3.93, 2.95 and 1.13, respectively, indicating that three types of complex are formed depending on the adsorbed species. Therefore, it can be concluded that PVC use as adsorbent is feasible since it requires a simple modification reaction with nontoxic and low-cost solvents. (AU)

• FAPESP's process: 18/18787-0 - Study of the (photo)catalytic properties of tin oxides modified with graphene and/or noble metals for the elucidation of the degradation mechanisms of organic contaminants
• Grantee: Alexandre de Oliveira Jorgetto
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 15/04791-8 - Synthesis and application of modified polyvinyl chloride (PVC)to a solid phase extraction of Cu(II), Ni(II), Cd(II) and Pb(II), from aqueous samples
• Grantee: Gustavo Rocha de Castro
• Support Opportunities: Regular Research Grants