Continuous adsorption of silver and copper by Verde-lodo bentonite in a fixed bed flow-through column

Author(s)

de Freitas, Emanuelle Dantas ^[1] ; de Almeida, Hewellyn Joacy ^[1] ; de Almeida Neto, Ambrosio Florencio ^[1] ; Adeodato Vieira, Melissa Gurgel ^[1]

Affiliation

^[1] Univ Campinas UNICAMP, Sch Chem Engn, Albert Einstein Ave 500, Cidade Univ Zeferino Vaz, BR-13083852 Campinas, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF CLEANER PRODUCTION; v. 171, p. 613-621, JAN 10 2018.
• Web of Science Citations: 16

Abstract

Several studies have been conducted to evaluate and to improve wastewater treatment. Among the contaminants in wastewater, toxic metals stand out and their removal by adsorption process is of great interest. Silver and copper binary adsorption on bentonite was evaluated in the present work, using a fixed bed dynamic system. Initially, a fluid dynamic study was performed with different flow rates and efficiency and mass transfer parameters were analyzed. Using the optimum flow rate, the effects of initial concentration and molar fraction were investigated according to the same parameters, besides metals removal. Next, two adsorption and desorption cycles were performed using nitric acid as eluent. Regenerated clay, after elution with nitric acid, was characterized in order to verify morphology, thermal stability, functional groups and crystal structure. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 13/00732-1 - Precious metal recovery by bio / adsorption onto non-conventional bio / adsorbents
• Grantee: Melissa Gurgel Adeodato Vieira
• Support Opportunities: Regular Research Grants