Potential Reuse of PET Waste Bottles as a Green Substrate/Adsorbent for Reactive Black 5 Dye Removal
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Potential Reuse of PET Waste Bottles as a Green Substrate/ Adsorbent for Reactive Black 5 Dye Removal Raiane Santos & Émerson F. M. Silva & Erica J. M. Dantas & Evelle D. C. Oliveira & Thiago B. Simões & Ítalo R. S. Araújo & André T. S. Ribeiro & Letícia P. S. Oliveira & Ramón R. P. Garcia & Luciano C. Almeida
Received: 30 June 2020 / Accepted: 9 October 2020 # Springer Nature Switzerland AG 2020
Abstract The adsorption process is one of the most promising alternatives for textile effluent treatment. Different materials have been used as adsorbents and most of them present hard recovery, increasing the process cost. In this work, polyethylene terephthalate (PET) waste bottles were used as a substrate for the formation of titanium dioxide (TiO2-G5) films aiming at Reactive Black 5 removal by adsorption process. The TiO2-G5/ PET films were characterized by N2 adsorption-desorption, zeta potential analysis, X-ray diffraction (XRD), and adherence test. The pH, adsorbent charge, and stirring effects were investigated. Initially, the effects of the adsorbent mass, pH of the solution, and stirring were studied, obtaining a maximum adsorptive capacity of 155.04 mg g−1 in the greatest condition (4 mg, pH = 4 and no stirring). The experimental data were fitted by the Langmuir and Freundlich isotherms. The Langmuir model presented the greatest fit, evidencing monolayer adsorption for this process. The kinetic study showed a great fit between the adsorption process and the pseudofirst-order kinetic model, which presented a correlation R. Santos : É. F. M. Silva : E. J. M. Dantas : E. D. C. Oliveira : T. B. Simões : Í. R. S. Araújo : A. T. S. Ribeiro : L. P. S. Oliveira : L. C. Almeida (*) Department of Chemical Engineering, Technology and Geoscience Center, Federal University of Pernambuco, Recife, PE 50740-521, Brazil e-mail: [email protected] R. R. P. Garcia Interdisciplinary Laboratory for Advanced Materials (LIMAV), Materials Science and Engineering Graduate Program (PPGCM), Federal University of Piauí, Teresina, Pi CEP: 64049-550, Brazil
coefficient of 0.982. The thermodynamic parameters— enthalpy (ΔH = − 19.53 kJ mol−1), entropy (ΔS = − 50.26 J mol−1 K−1), and Gibbs energy (− 5.31, − 4.80, and − 4.30 kJ mol−1 at 283.15 K, 293.15 K, and 303.15 K, respectively)—indicate a spontaneous and exothermic process. Finally, the regeneration by solar radiation exposure led to an efficient TiO2-G5/PET spent sheets recovery, exhibiting good stability after 5 cycles of use.
Keywords Wastewater . Water treatment . PET waste bottle . Textile dye . TiO2-G5 immobilization
1 Introduction The water sources contamination by textile dyes consist of one of the main environmental pollution causes. A great amount of water is consumed at the productive chain of these industries, especially in the textile dyeing step. This can result in the formation of effluents with great diversity and chemical complexity (Pizato et al. 2017). The residual water eviction without preliminary treatment in water bodies decreases the receiving water body
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