Hexavalent chromium removal from water by microalgal-based materials: Adsorption, desorption and recovery studies

Ehsan Daneshvar; Mohammad Javad Zarrinmehr; Masoud Kousha; Atefeh Malekzadeh Hashtjin; Ganesh Dattatraya Saratale; Abhijit Maiti; Meththika Vithanage; Amit Bhatnagar

doi:10.1016/j.biortech.2019.122064

Hexavalent chromium removal from water by microalgal-based materials: Adsorption, desorption and recovery studies

Bioresour Technol. 2019 Dec:293:122064. doi: 10.1016/j.biortech.2019.122064. Epub 2019 Aug 26.

Authors

Ehsan Daneshvar¹, Mohammad Javad Zarrinmehr², Masoud Kousha³, Atefeh Malekzadeh Hashtjin¹, Ganesh Dattatraya Saratale⁴, Abhijit Maiti⁵, Meththika Vithanage⁶, Amit Bhatnagar⁷

Affiliations

¹ Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland.
² Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland; Department of Natural Resources, Isfahan University of Technology, Isfahan 8415683111, Iran.
³ Department of Fisheries, Faculty of Animal Science and Fisheries, Sari Agricultural Sciences and Natural Resources University, Km 9 Darya Boulevard, P.O. Box, 578, Sari, Iran.
⁴ Department of Food Science and Biotechnology, Dongguk University-Seoul, Ilsandong-gu, Goyang-si, Gyeonggi-do 10326, Republic of Korea.
⁵ Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur 247001, India.
⁶ Ecosphere Resilience Research Center, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda 10250, Sri Lanka.
⁷ Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland. Electronic address: amit.bhatnagar@uef.fi.

PMID: 31491650
DOI: 10.1016/j.biortech.2019.122064

Abstract

The current study presents a comprehensive comparison towards the potential of different microalgal-based materials for the removal of hexavalent chromium (Cr(VI)) from water. Among the tested materials, microalgal biochar showed the highest removal efficiency (100%) of Cr(VI). The highest monolayer estimated adsorption capacities were 23.98, 25.19 and 24.27 mg/g at 5, 22 and 35 °C, respectively. Experimental data showed good compliance with pseudo-second-order kinetic model. The results of continuous column studies showed that the column removal efficiency increased from 52.33 to 57.58% by increasing the adsorbent dose from 0.125 to 0.200 g. Desorption efficiency of Cr(VI) by 0.1 M NaOH was increased from 51.16 to 59.41% by sonication bath as compared to roller shaker. More than 97% of desorbed Cr(VI) was recovered in less than 10 min by BaCl₂. This study shows that non-living microalga materials are more effective than living cells in the removal and recovery of Cr(VI) from water.

Keywords: Biochar; Biosorption; Desorption; Hexavalent chromium (Cr(VI)); Microalga; Recovery.

MeSH terms

Adsorption
Chromium
Microalgae*
Water
Water Pollutants, Chemical*

Substances

Water Pollutants, Chemical
Water
Chromium
chromium hexavalent ion