title: Effects of co-substrate and biomass acclimation concentration on the bioregeneration of azo dye-loaded mono-amine modified silica.
abstract: Bioregeneration of mono-amine modified silica gel (MAMS) adsorbent loaded with Acid Orange 7 (AO7), Acid Yellow 9 (AY9) and Acid Red 14 (AR14), respectively, was investigated under two different operational conditions, namely absence/presence of sucrose/bacto-peptone as the co-substrate and different biomass acclimation concentrations. The results revealed that the AY9- and AR14-loaded MAMS adsorbents could almost be completely bioregenerated but only in the presence of co-substrate whereas the bioregeneration of AO7-loaded MAMS could achieve up to 71% in the absence of the co-substrate. These differences could be related to the structural properties of the investigated azo dyes. In addition, the results showed that the bioregeneration duration of AO7-loaded MAMS could be progressively shortened by using biomass acclimated to increasingly higher AO7 concentration. However, the bioregeneration efficiencies were found to be relatively unchanged under different biomass acclimation concentrations.
authors.affiliation: School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia. al_amrani2014@yahoo.com
authors.forename: Waheeba A
authors.initials: WA
authors.lastname: Al-Amrani
authors.forename: P E
authors.initials: PE
authors.lastname: Lim
authors.forename: C E
authors.initials: CE
authors.lastname: Seng
authors.forename: W S
authors.initials: WS
authors.lastname: Wan Ngah
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry*; D018533:Biomass; D004396:Coloring Agents / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013379:Substrate Specificity
chemical_list: D000588:Amines; D001391:Azo Compounds; D004396:Coloring Agents; D012822:Silicon Dioxide
keywords: Acclimation concentration; Azo dye; Bioregeneration; Co-substrate; Modified silica