Comfort Abidemi Adeyanju

Bio: Comfort Abidemi Adeyanju is an academic researcher from University of Ilorin. The author has contributed to research in topics: Adsorption & Materials science. The author has an hindex of 5, co-authored 10 publications receiving 77 citations.

Mitigation of clofibric acid pollution by adsorption: A review of recent developments

Abstract: Clofibric acid (CA) is one of the recalcitrant pharmaceutical compounds observed as a pollutant in the environment in recent times. This paper aimed to evaluate the recent developments in the last decade on the mitigation of CA from aqueous media by adsorption. The adsorbents were classed into carbon-based materials, clay and minerals, and polymer and resins. It was observed that the best class of adsorbents (with adsorption capacity >300 mg/g) for CA adsorption were carbon-based materials. The highest reported adsorption capacity for CA in the last decade was 994 mg/g by graphene nano-sheets. CA adsorption was mostly best fit to Langmuir or the Freundlich isotherm and kinetics was majorly according to the pseudo-second order model. CA can successfully be desorbed form adsorbent media by suitable eluents and reused. This suggests that adsorption can be economical in an industrial scale for the removal of CA from effluents. For future work, graphene oxide and metal organic frameworks could be modified for higher adsorption capacity. The disposal technique for used adsorbent after CA uptake could be explored.

CuO nanoparticles (CuO NPs) for water treatment: A review of recent advances

Abstract: Copper oxide nanoparticles (CuO NPs) are regularly investigated and effective adsorbent materials due to their small size, high surface area, natural abundance of starting material for synthesis, low-cost production processing and non-toxic nature. In this study, the adsorption of pollutants by CuO NPs was reviewed. The goal was to synthesise recent research findings, identify knowledge gaps and predict areas for future work. Conventional chemical processes like microwave heating technique and precipitation are the most popularly employed techniques for the synthesis of CuO NPs. The highest reported adsorption capacity for CuO NPs was 3152 mg/g for fluoride showing it can remove more than 3 times its weight fluoride from the aqueous phase. The best-fit kinetics and isotherm models for adsorption using CuO NPs is the pseudo-second order model (R2 > 0.99) and Langmuir model (R2 > 0.99) respectively for dyes and heavy metals. Thermodynamics analysis revealed that the adsorption by CuO NPs process was majorly spontaneous and endothermic. CuO NPs can be reused for as much as 5 cycles with >80 % recovery of pollutants in most cases. Areas for future work include mechanistic investigations by statistical physics, competitive adsorption and column experiments. Due to the negative ecotoxicological effect of the use of CuO NPs, special care must be taken to remove/recover it from wastewater before environmental release. It is surmised that CuO NPs is an effectively used adsorbent for the mitigation of various pollutants from the aqueous environment.

Mitigation of Metronidazole (Flagyl) pollution in aqueous media by adsorption: a review

Abstract: In light of the changing consumption and lifestyle patterns, emerging contaminants such as pharmaceutical compounds in the ecosystem are now a cause for concern. Metronidazole (MNZ) also known as F...

A review on Luffa fibres and their polymer composites

Abstract: Luffa spp. is readily available and widely grown in Asia and Africa and is a rich source of natural fibres for composite development. This paper reviews research findings on Luffa fibres and their composites. The progress of research, novel findings that affect the paradigm of the research area, recent trends, knowledge gaps and future perspectives are evaluated. It was found that the average chemical composition of Luffa fibres ranges from 57–74% cellulose, 14–30% of hemicellulose, 1–22% of lignin and 0–12.8% of the other components. Luffa fibres were usually extracted by drying. Furthermore, the most common modification technique was found to be by alkali mercerisation. About 53% of the research studies made use of epoxy resins for their base polymer making it the most popular polymer type for Luffa fibre reinforced composites. The composites are fabricated usually by manual mixing and hand layup and the most common curing technique was found to be compression moulding (about 63% of the research studies). The mechanical, thermal, crystalline and other properties of the composites are also considered in this review. Further interesting areas suggested for future work include investigation of the effect of drying, more trials with L. acutangula and utilisation of multi-resin ternary systems. It is concluded that Luffa is a promising material for composite development and based on its favourable properties is likely to continue playing an important role for the years to come.

Adsorption of methyl orange: A review on adsorbent performance

Abstract: Adsorption as a technique is preferred to these other methods in the mitigation of methyl orange (MO) because of its simplicity in design and operation, indifferent sensitivity towards toxicants and low operational cost. This study is aimed at evaluating the performance of various adsorbent groups in the mitigation of MO from aqueous solutions. It will help reduce the arbitrary choice of adsorbent types for MO adsorption leading to a reduction in the amount of published literature with little/incremental contributions to the field. The study was based on an analysis of over 240 published works of literature on the subject within the last 5 years. The adsorbents were classified into the following seven groups based on their chemical composition; biosorbents, activated carbon, biochar, clays and minerals, polymers and resins, nanoparticles, and composites. In terms of frequency of utilisation of adsorbent group, composites were the most frequently used (>40%). It was observed that nanoparticles and polymers were the most frequently used constituents in the manufacture of composite adsorbents for MO. The choice of nanoparticles in composite adsorbents could be due to their flexibility in going into the matrices of other material types due to their small sizes. Polymers also act as good matrices for immobilising other composite constituents. Nanoparticles was the best adsorbent group for MO uptake. Clays and minerals had the greatest proportion of adsorbents with MO uptake capacity greater than the 1000 ​mg/g threshold.