Abbreviation: J. Chem. Eng. Mater. Sci.
Start Year: 2010
Page 1 of 4, showing 20 records out of 69 total, starting on record 1, ending on 20
DOI: 10.5897/JCEMS2017.0293[Article Number: 483F55964391]
In this study, the photocatalytic oxidation by UV-activated TiO2 was investigated for the degradation of a 15 mgL-1 solution of 17 α-ethinylestradiol (EE2) in an ultra-pure water matrix. The TiO2 adsorption, solution pH and catalyst TiO2 concentration were evaluated. Operating as a batch reactor, the system showed a 90% removal, with a 40-min retention time, a pH value of 8 a TiO2 concentration of 0.1 gL-1, and a... Read more.
DOI: 10.5897/JCEMS2016.0274[Article Number: 49F025162685]
Nowadays, polyvinyl chloride (PVC) is the most usual plastic. Therefore, to make PVC, its monomer called vinyl chloride (VCM) must be produced first. It is a severely endothermic reaction that is done in an ethylene dichloride thermal cracking reactor within a temperature range of 680 to 758°K and pressure range of 2500000 Pascal. Thus, this cracking reaction changes into hydrochloric acid and VCM. In production... Read more.
DOI: 10.5897/JCEMS2016.0237[Article Number: 9D293F560977]
A new constitutive equation is developed to model the flow stress on a metal surface undergone high speed impacts that result in strain hardening. The new equation is based on the Johnson-Cook model and has considered the effects of strain, strain rate, grain refinement, twin formation and twin spacing. Two mechanisms for the strain hardening are proposed: Grain refinement or twin formation, depending on the strain... Read more.
DOI: 10.5897/JCEMS2015.0231[Article Number: 7E1715F59501]
The objective of this study was to determine the potential of using Malaysian silica sand as the SiO2 raw material in producing leucite (SiO2-Al2O3-K2O) glass-ceramics. The crystallization, mechanical and biological properties of the glass-ceramic was studied. A starting glass composition in the system of leucite was melted in an electric furnace, quenched in deionized water and dry milled to obtain glass powder. The... Read more.
DOI: 10.5897/JCEMS2016.0252[Article Number: BF8C0B859503]
Polymer modified concrete is one of the alternative material of construction to obtain better performance in strength and durability of concrete. There are some types of PMC such as natural rubber, synthetic rubber, modified rubber and asphalt. In this work, copolymer of natural rubber styrene and copolymer of natural rubber methacrylate were used as PMC added to Portland cement concrete and Portland Pozzolan... Read more.
DOI: 10.5897/JCEMS2015.0235[Article Number: 46D281B59460]
Chitosan is a natural polymer gotten from shrimp and crab skeleton; chemical structure of chitosan is similar to cellulose where hydroxyl (OH) in glucose molecule in cellulose is replaced by amine (–NH2) in chitosan. From the chemical structure and its properties, chitosan can be used as a filler and adhesive to replace the traditional materials and it will improve several properties of papers such as to increase... Read more.
DOI: 10.5897/JCEMS2015.0221[Article Number: BC8E1C655527]
This study investigated how 0.33% medium carbon steel is affected by induced stress in a saline environment. Three geometries namely U-bend, C-ring and I-shape samples were formed representing varying degrees of stress level induced on the samples. The test specimens were subjected to static loading in saline environment containing 15.0 wt.%, 10.0 wt.% and 3.5 wt.% of sodium chloride (NaCl) for a typical exposure time... Read more.
DOI: 10.5897/JCEMS2015.0212[Article Number: 8F82FDC54973]
Acid mine drainage (AMD) is detrimental to both humans and the ecosystem, and contains sulphuric acid and heavy metals, which have to be removed by dosing the coagulants. A 200 mL sample of AMD, emanating from a mining area in South Africa was poured into 500 mL glass beakers or Erlenmeyer flasks and were dosed with 0.043 M Ca(OH)2, 0.043 M Mg(OH)2 and synthetic 0.043 M CaMg.2(OH)2 and treated in a jar test or shaking... Read more.
DOI: 10.5897/JCEMS2015.0217[Article Number: 329492854976]
The acid mine drainage (AMD) was poured into five 500 ml glass beakers. The samples were dosed with synthetic af-PFCl of Ca(OH)2 and af-PFCl of CaCO3 polymers respectively. The samples were treated in a jar test and a shaker at 250 rpm for 2 min, and thereafter were allowed to settle for an hour after which the pH, conductivity and turbidity (TSS) were measured. A similar second set of experiments was conducted by... Read more.
DOI: 10.5897/JCEMS2015.0219[Article Number: 11AB3A554117]
Activated carbons were prepared by phosphoric acid activation of Canarium Schweinfurthii spent nutshell. The activation conditions for particles with average diameter of 2.36 mm, conducted in nitrogen chamber, were evaluated at 40 and 60% acid concentration, substrate/activating agent (impregnation) ratio of 1:1 to 1:4, activation time of 20 to 60 min and temperatures of 200 and 400°C. The results showed that... Read more.
DOI: DOI 10.5897/JCEMS2014.0199[Article Number: 7DCF17C52283]
A transient model for an industrial fluid catalytic cracking (FCC) riser is here presented. The FCC riser models of previous researchers were mostly based on the assumption of negligible mass transfer resistance. This assumption reduced the accuracy of the models. In this work, the effects of mass transfer resistance and coking on the yield of FCC reactions were modeled and simulated. A five-lump reaction scheme was... Read more.
DOI: 10.5897/JCEMS2014.0186[Article Number: BD881E348240]
Unsaturated polyester was modified with dioctyl phthalate (DOP) and used as matrix in glass fiber reinforced composite. The effect on the thermal stability of the composite was studied in this work. The results of the modification showed that modified matrix had the best thermal stability at 5 wt% DOP with temperature of 373°C at 20% weight loss as compared with unmodified of temperature of 346°C at the same... Read more.
DOI: DOI 10.5897/JCEMS2014.0166[Article Number: 69AE5F547546]
The production of steel from the locally available Itakpe Iron Ore in Nigeria was achieved in the Delta Steel Direct Reduction-Electric Arc Furnace Plant. The ore was originally thought to be unsuitable for use in the direct reduction process due to its low total iron content, less than 64% and high gangue content which was in excess of 4% and above the maximum acceptable limit of 3.5%. Pilot and Plant tests were... Read more.
DOI: 10.5897/JCEMS2014.0182[Article Number: FF7E25546435]
This work presents two developments in Antoine vapor pressure correlation: (1) Generalization of the correlation using the principle of corresponding state; (2) Prediction of the Antoine coefficients form molecular weight. The coefficients of the generalized correlation are correlated to molecular weight (r2=0.99) for the group of normal alkanes (C1 to C20). The method is validated using experimental data obtained from... Read more.
DOI: 10.5897/JCEMS2014.0176[Article Number: D79564246308]
The potential of using used-water-sachets, a synthetic polymeric waste, which is not only readily available but indiscriminately littered around Nigerian urban and rural areas, as an adsorbent in removal of oil spilled on water was investigated. Used-water-sachets, a waste generated all over the country, has been converted into a low cost adsorbent. The sachets were collected, pretreated and pulverised to adsorb crude... Read more.
DOI: 10.5897/JCEMS2014.0177[Article Number: 93ABCC745844]
This paper presents the results obtained and the discussion made from a series of corrosion experiments involving aluminum alloy (LM 13) reinforced with Nano-ZrO2, size of the particles dispersed varies from 100 to 200 nm and amount of addition varies from 3 to 15 wt.% in steps of 3 wt.%. The resulting CNMMCs are solidified under the influence of copper chill of 25 mm thickness to study the effect of corrosion behavior.... Read more.
DOI: 10.5897/JCEMS2014.0181[Article Number: 0F8CABD45848]
An excellent conversions of benzaldehyde was obtained under solvent and solvent free conditions by utilizing Co(im)20.5 DMA as catalyst for the synthesis of benzylidene malononitrile. The catalytic prospect of this crystalline porous framework was extended to oxidation reactions involving ethylene glycol (EG) and ethylbenzene (EB). Unexpectedly, EG was totally oxidized to oxalic acid; which demonstrates the catalyst... Read more.
DOI: 10.5897/JCEMS2014.0172[Article Number: D07831944426]
As developing nations strive for economic sustainability, effort is geared towards exploiting biomass materials that could have alternative uses to their conventional low valued uses in order to achieve this goal. It is because of this that palm kernel shell, a byproduct of oil palm processing, is characterized for its application in construction and water treatment industries. The materials physical and chemical... Read more.
DOI: 10.5897/JCEMS11.036[Article Number: 80A106A42211]
A time dependent atmospheric model is represented for chemically reactive primary pollutants emitted from an elevated line source into a stable atmospheric boundary layer, over rough surface terrains. The time dependent model was obtained through an analytical solution from a multiple Inverse Laplace transform of the atmospheric diffusion equation with the parabolic eddy-diffusion coefficient (exchange coefficient) and... Read more.
DOI: 10.5897/JCEMS2013.0161[Article Number: 75C20D642213]
Based on the status of the air pollution in China, three basic assumptions are proposed. The China’s inter-provincial cooperative control of air pollution (ICCAP) model is established by the combination of national optimization model and allocation model of cooperation benefit. A case study for the pollutant SO2 control in China shows that the proposed model is superior to the current command-order regulation. Our... Read more.
Page 1 of 4, showing 20 records out of 69 total, starting on record 1, ending on 20