Research Papers/Topics in Chemistry

Kinetic studies of the biosorption of lead and zinc from solution using tea fibre

Abstract: This paper presents a biobsorption study on Zn and Pb(II) from dilute aqueous solution using tea fiber as the biosorbent. The biosorption study was carried out as a function of contact time, initial metal ion concentration and biosorbent dosage. The residual Zn and Pb(II) in solution were determined using atomic absorption spectrophotometer. The biosorption was also time dependent as maximum biosorption was obtained after 10 and 20 min, for both lead and zinc respectively. Kine...

Medicinal Chemistry Comparative Phytochemical Screening on Three Growth Stages of Pennisetum Pedicellatum Trin

A comparative preliminary study on the extraction and phytochemical profile of methanolic extracts of the leave, stem and root of pennisetum pedicellatum Trin at three growth stages (i.e stage 1, stage 2, stage 3) was carried out. The extracts were analysed to determine the presence of phytochemicals in the plant. The study revealed the presence of alkaloids, flavonoids, saponins and steroids. Tanins were found only in the stems of the plants and steroids were found only in the leaves....

Studies on heavy metals contents of Osun River at the pre-urban settlement and across Osogbo City, Nigeria

Heavy metals were analysed in Osun River (Nigeria) between 2017 and 2018. Concentrations of the heavy metals were in the increasing order: Fe > Zn > Cu > Mn > Pb > (Ni, Cr) > (Cd, Co). Iron made up 76% of the total heavy metals measured. Activities at Swanlux Farm (a major oil palm farm) seemed to impart on Osun River as the highest Fe concentration (2.55 mg/L) was measured near the farm. In the urban settlement, average zinc concentration was almost double (0.37 mg/L) of that found i...

PHYTOCHEMICAL ANALYSIS AND ISOLATION OF COMPONENTS OF STEM-BARK OF CHRYSOPHYLLUM ALBIDUM (G.Don)

Chrysophyllum albidum (Sapotaceae) is known to possess bioactive compounds belonging to important phytochemical groups. This work aims at exploring the bioactive constituents of the stem-bark of Chrysophyllum albidum, and further investigating their phytochemical compositions. Stem bark of Chrysophyllum albidum was collected, dried, powdered and extracted with hexane for 13 hours using soxhlet extraction. This was concentrated using a rotary evaporator. Phytochemical screenings of the ext...

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