AJCE_Vol 04 N 01

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    Recovery of Cationic Dyes Bearing Wastewater Using Shea Butter Leaves: Kinetic Adsorption, Desorption and Reusability Studies
    (University of Eloued جامعة الوادي, 2023-06-18) Shehu, M-B Ayuba, B
    The present study explains the preparation and application of Vitellaria paradoxa Activated Carbon (VPAC) as a new low-cost adsorbent in the removal of methylene blue and rhodamine B dye from its aqueous solution. SEM showed surface morphology, EDX disclosed elemental composition while pHpzc determines the pH at which the adsorbent surface has net electrical neutrality. The effects of operating parameters such as contact time, adsorbent dose, initial dye concentration, pH, temperature and competition were investigated for the removal of methylene blue and rhodamine B dyes using VPAC. VPAC was maximum at pH of 6 contact time of 60min and pH of 7 contact of time 80min respectively. The adsorption kinetic results showed that the pseudo-second order model was more suitable to explain the adsorption of methylene blue and rhodamine Bdye onto VPAC, because the calculated and experimental are in agreement. In VPAC, Qexp = 49.092mg/g, Qcal = 49.505mg/g and R2= 0.999 for methylene blue while Qexp = 49.508mg/g, Qcal = 49.011mg/g and R= 0.999 for rhodamine B. The adsorption mechanism results showed that the adsorption process was controlled by both the internal and external diffusion of methylene blue and rhodamine B dye molecules. Desorption studies for reusability revealed that HCl offered the best recovery.
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    Comparing the Correctness of Different Relations for Approximation of Retention Times in Reversed Phase HPLC with Methanol–Water Eluents
    (University of Eloued جامعة الوادي, 2024-06-04) Derouiche Abdennour .Zenkevich ,Igor G
    The correctness of different relations for approximating the retention times of selected analytes of different chemical origin in reversed phase high performance liquid chromatography (isocratic conditions, methanol–water eluents) is compared. Five equations most often used in analytical practice were considered: hyperbolic (Scott-Kuchera model), logarithmic (Soczewinski–Wachtmeister and Snyder–Soczewinski models), second degree polynomial, and recently proposed recurrent relations, tR(C + ΔC) = atR(C) + b, where tR is net retention time, and ΔC is the constant increment of the concentration of an organic modifier in an eluent. Two criteria for comparing the approximation quality were used. The first of them (known previously) is the maximal value of the correlation coefficient for the dependence tR(C); the second one is newly proposed. It implies hypothetical exclusion of the maximal and the minimal tR values from the total data set, followed by precalculation of these values using the remaining data and evaluation of the differences (tR – tR,calc) for both of them. The results obtained show that just recurrent relations provide the maximal precision of approximations compared to all the previously known approaches. In addition, the important advantage of recurrences is their applicability to net retention times without converting them to adjusted retention times
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    A short review of Nanomaterials: Synthesis methods, properties, and applications
    (University of Eloued جامعة الوادي, 2023-03-23) ALHAMAD, Ali ALNAZZA . ZEGHOUD, Soumeia .Ilham ,BEN AMOR.ZAATER,Abdelmalek . BEN AMOR,Asma. AOUADI,Abdelatif . HEMMAMI, Amira.NLEONU,Emmanuel CHILE
    Due to their significant features, engineered nanomaterials have received much attention recently, sparking significant technical and monetary growth across various industrial sectors. Moreover, it is anticipated that nanomaterials will support a variety of industries, including microelectronics, materials, textiles, energy, healthcare, and cosmetics. Nanotechnology applications will lead to the development of lighter, stronger, and cleaner materials, intelligent medications, and diagnostics in the medical field. The relative hazards of various nanomaterials to humans and the environment are still up for debate, therefore, it's essential to be aware of the concerns related to possible toxicity and exposure route. Here, we go through several elements of creating, characterizing, and using nanoparticles.