TY - JOUR
T1 - Hexavalent chromium removal from water by microalgal-based materials
T2 - Adsorption, desorption and recovery studies
AU - Daneshvar, Ehsan
AU - Zarrinmehr, Mohammad Javad
AU - Kousha, Masoud
AU - Hashtjin, Atefeh Malekzadeh
AU - Saratale, Ganesh Dattatraya
AU - Maiti, Abhijit
AU - Vithanage, Meththika
AU - Bhatnagar, Amit
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/12
Y1 - 2019/12
N2 - 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.
AB - 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.
KW - Biochar
KW - Biosorption
KW - Desorption
KW - Hexavalent chromium (Cr(VI))
KW - Microalga
KW - Recovery
UR - http://www.scopus.com/inward/record.url?scp=85071623315&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2019.122064
DO - 10.1016/j.biortech.2019.122064
M3 - Article
C2 - 31491650
AN - SCOPUS:85071623315
SN - 0960-8524
VL - 293
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 122064
ER -
