Recovery of gold from industrial wastewater by extracellular proteins obtained from a thermophilic bacterium Tepidimonas fonticaldi AT-A2

Yin Lung Han, Jen Hao Wu, Chieh Lun Cheng, Dillirani Nagarajan, Ching Ray Lee, Yi Heng Li, Yung Chung Lo, Jo Shu Chang

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Biosorption has emerged as a promising alternative approach for treating wastewater with dilute metal contents in a green and cost effective way. In this study, extracellular proteins of an isolated thermophilic bacterium (Tepidimonas fonticaldi AT-A2) were used as biosorbent to recover precious metal (i.e., Au) from wastewater. The Au (III) adsorption capacity on the T. fonticaldi AT-A2 proteins was the highest when the pH was set at about 4.0–5.0. The adsorption capacity increased with increasing temperature from 15 to 70 °C. Adsorption isotherm studies show that both Langmuir and Freundrich models could describe the adsorption equilibrium. The maximum adsorption capacity of Au (III) at 50 °C and pH 5 could reach 9.7 mg Au/mg protein. The protein-based biosorbent was also used for the recovery of Au from a wastewater containing 15 mg/L of Au, achieving a high adsorption capacity of 1.45 mg Au/mg protein and a removal efficiency of 71%.

Original languageEnglish
Pages (from-to)160-170
Number of pages11
JournalBioresource Technology
Volume239
DOIs
Publication statusPublished - 2017 Jan 1

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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