Gilbert Adie

Publications (2) View all

• Article: Multistage optimization of the adsorption of methylene blue dye onto defatted Carica papaya seeds

  Emmanuel I. Unuabonah, Gilbert U. Adie, Lora O. Onah, Olalere G. Adeyemi
  [show abstract] [hide abstract]
  ABSTRACT: Carica papaya seeds were defatted and used for the adsorption of methylene blue dye (MB dye). The pHPZC and specific surface area (SSA) of the defatted and undefatted Carica papaya seeds were found to be 6.25 and 143.27 m2 g−1 respectively. The adsorption capacities of the defatted Carica papaya seeds were 1250 and 769.23 mg g−1. Fourier transformed infrared (FT-IR) spectra analysis of defatted seeds suggests the presence of α,β-unsaturated ketone, β-keto (enolic) esters and lactones, quinones and carboxylic acids which were absent in the undefatted sample. The presence of carboxylic acid, phenolic and lactone functional groups were confirmed by surface chemistry studies. Adsorption of MB dye onto DPS adsorbent was found to be exothermic and spontaneous. FT-IR spectra of various particle sizes indicate the presence of functional groups on every particle size necessary for the adsorption of MB dye.Pseudo-second-order kinetic rate constant increased with increasing initial MB dye concentration. The adsorption reaction was observed to be very fast perhaps because of the presence of multiple functional groups with some of them having lone pair of electrons. Increasing pH was observed to have very little positive effect on the adsorption of MB dye on DPS adsorbent. Increasing particle size decreased the adsorption capacity of DPS adsorbent for MB dye. It is suggested that the mechanism for the adsorption of MB dye onto DPS adsorbent might not only be solely controlled by film diffusion but also by pore diffusion.Mathematical models for the optimization of adsorbent dose, number of adsorption stages and minimum contact time were developed. The optimum conditions for the adsorption of 99% of 100 mg L−1 MB dye from 10 m3 of aqueous solution of the dye were five adsorption stages, ≈21 kg for each stage with a total minimum contact time of ≈71 min.
  Chemical Engineering Journal.
• Source

  Available from: ajol.info

  Article: Impact of effluent from Bodija abattoir on the physico-chemical parameters of Oshunkaye stream in Ibadan City, Nigeria

  O. Osibanjo, G. U. Adie
  [show abstract] [hide abstract]
  ABSTRACT: The problem of getting quality drinking water is increasing as untreated effluents are discharged into surface water bodies. The impact of effluent from Bodija abattoir, the biggest abattoir in Ibadan, western Nigeria on the physico-chemical parameters of Oshunkaye stream was investigated. The qualities of effluent and stream water (before and after mixing with effluent) were studied using the basic water quality parameters. The ranges of the physico-chemical parameters studied were as follows: pH 6.92 – 8.18, temperature 31 – 34°C, total solids 7726 – 47 630 mg/l, total suspended solids 1498 – 6803 mg/l, chemical oxygen demand 947 - 2566 mg/l, oil and grease 2500 –12590 mg/l, nitrate 62 – 159 mg/l, phosphate 142 - 180 mg/l, chloride 1052 – 1727 mg/l, lead 0.08 – 0.2 mg/l, nickel 0.18 – 0.49 mg/l, copper not detected – 0.14 mg/l, zinc 0.67 – 6.08 mg/l and cadmium (not detected). Using Prati’s et al classification of surface water quality, Oshunkaye stream fell in the class of grossly polluted water after mixing with effluent from the abattoir. While before mixing, it fell in class of slightly polluted. Hence the abattoir effluent needs to be treated before discharge into the receiving stream to reduce health hazard.
  African Journal of Biotechnology (ISSN: 1684-5315) Vol 6 Num 15.