Journal
BIORESOURCE TECHNOLOGY
Volume 257, Issue -, Pages 84-91Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.02.075
Keywords
Azo dye; Hairy roots; Helianthus annuus; Light; Adsorption kinetics; Adsorption equilibrium
Funding
- Department of Biotechnology (DBT) [BT/PR5835/PID/6/688/2012]
- Department of Science and Technology, Government of India [SR/FT/LS-52/2012]
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The study demonstrates for the first time that light influences the adsorption equilibrium and kinetics of a dye by root culture system. The azo dye (Reactive Red 120) adsorption by the hairy roots of H. annuus followed a pseudo first-order kinetic model and the adsorption equilibrium parameters were best estimated using Langmuir isotherm. The maximum dye adsorption capacity of the roots increased 6-fold, from 0.26 mg g(-1) under complete dark conditions to 1.51 mg g(-1) under 16/8 h light/dark photoperiod. Similarly, adsorption rate of the dye and removal (%) also increased in the presence of light, irrespective of the initial concentration of the dye (20-110 mg L-1). The degradation of the azo dye upon adsorption by the hairy roots of H. annuus was also confirmed. In addition, a strategy for simultaneous dye removal and increased alpha-tocopherol (industrially relevant) production by H. annuus hairy root cultures has been proposed and demonstrated.
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