Algerian Journal of  Materials Chemistry  

November 01, 2020

Sara Hussien Ali, Ahmed Mohammed Abbas, Firas Habeb Abdulrazzak

1-University of Baghdad, College of education for pure science\Ibn al-Haitham , Department of Chemistry, Baghdad, Iraq

2-Diyala University, College of education for pure science, Department of Chemistry, Diyala, Iraq

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Abstract- This review dealt with environmental pollution with a number of pollutants, especially pollution with heavy elements, and because of its significant effects on the environment in general and on humans in particular, despite its presence in low quantities. How to treat it in several ways, but the most effective and least economical is adsorption technology considering that heavy elements are adsorbed materials used Bentonite clay as the adsorbent surface to remove it from aqueous solutions. Several studies also dealt with the possibility of improving the adsorption properties of bentonite clay by modifying and activating it with several experimental materials and conditions. Also, they discussed the possibility of applying the most famous kinetic models and isotherms models in addition to calculating thermodynamic functions for adsorption of heavy elements on bentonite or modified bentonite clay

Keyword : Bentonite ,Heavy metal , Adsorption .

September 29, 2020

Usman Ahmad , Hamisu Umar Farouk and Bishir Usman*

Department of Pure and Industrial Chemistry, Faculty of Physical Sciences, College of Natural and Pharmaceutical Sciences, Bayero University, Kano, P.M.B.3011, Kano State, Nigeria.

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Abstract. The inhibition action of Camel dung extract on corrosion of Mild steel in 1M and 2M HCl acid solution was studied using weight loss method. Fourier Transform Infrared Spectroscopic Analysis (FTIR) was used to characterize the inhibitor and the corrosion product. The effect of different inhibitor concentrations was studied at 303, 313, 323 and 333K. The result showed that the percentage of inhibition efficiency (% I.E.) increased with increase in the inhibitor concentration and decrease with rising in temperature in all the HCl solution media. The highest I.E. was found 63.04% and 45.94% at 303K and 2.0%v/v inhibitor concentration in 1M and 2M HCl solution respectively. The inhibitive action of the inhibitor is due to the adsorption of inhibitor molecules on the metal surface. The adsorption of the inhibitor on the surface of Mild steel was found to be a physical adsorption mechanism. Activation Energy and Enthalpies governing the adsorption process were found to be increasing with increase in the concentration of the inhibitor.

Keywords:  Corrosion Inhibition, Cowdung, Mild steel, HCl

Vol.3 Issue 2, pp 77–89, (2020)

July 20, 2020

Usman Abdulfatai*, Adamu Uzairu, Sani Uba and Gideon Adamu Shallangwa

1Department of Chemistry, Ahmadu Bello University P.M.B. 1044, Zaria-Nigeria

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Abstract. The growing concern among chemical industrialist and other researchers to explore other alternatives to replace the long-time use of ZDDP has continued to generate momentum. Less efficiency of catalytic converters and exhaust particulate zinc matter deposit have all been traced to the frequent use of ZDDP as a base oil additive. Quantitative structure-property relationship (QSPR) and a dynamics molecular simulation were theoretical tools used for designing and investigating new antioxidant lubricant additives. Five new oxidant resistance lubricant additives were designed from the information derived from the QSPR mathematical model’s high coefficient molecular descriptors. All the novel antioxidant lubricant additives properties were found to be better than our previous study, with the lubricant additive (Z)-3-(4-(5-amino-1-phenyl-1H-pyrazole-3-yl)-3,5-dimethylphenyl)-2-phenyl-5-(thiophen-2-ylmethylene)-3,5-dihydro-4H-imidazol-4-one found to possess excellent antioxidant properties of 0.850281T.A.V 0.1g/L than its co-additives. All the designed additives do not contain Phosphorus and Zinc which often rendered exhaust pipe catalytic converter inactive thereby increasing environmental pollution.Moreover, from our dynamic simulation study, all the designed additives were found to dynamically bind to the simulated surface of steel than to DLC crystal simulated surface. This research has provided a theoretical framework towards synthesizing new and better antioxidant lubricating base oil additives that could hinder the base oil from undergoing a complete circle of oxidation.

Keywords: QSPR; Novel lubricant additive: DLC: DFT:  Molecular dynamics simulations.

Vol.3 Issue 2, pp61–76, (2020)

May 06, 2020

Paul Ocheje Ameh

 Physical Chemistry Unit, Department of Chemistry, Nigeria Police Academy, Wudil, P. M B. 3474, Kano State Nigeria

Abstract. Adsorption of Cd2+, Ni2+ and  Pb2+  from aqueous solution by chitosan / raphia palm activated carbon composite (CRPAC) material prepared in the form of beads have been investigated through batch mode adsorption process. The results obtained indicated that the modification of the chitosan by coating with raphia palm tends to increase the capacity of the chitosan as an adsorbent. The adsorption of the studied metals onto CRPAC was found to be favoured by Freundlich isotherms and was influenced by pH, contact time, concentration, biomass and dose. The kinetic studies showed that the adsorption followed a pseudo-second-order model with chemisorption mechanism being favoured. Thermodynamic study on the adsorption capacity of the adsorbents indicated that the adsorption is spontaneous ( were negative), endothermic ( values were positive) and occurred with increasing degree of orderliness rather than disorderliness.

Keywords: Adsorption, chitosan, raphia palm, polymer, water pollution.

Vol.3 Issue 2, pp48–60, (2020)