Tag Archives: Adsorption

Using Modified Nano- Hydroxyapatite for Removing Iron Ions Contaminants from Groundwater (Published)

In this article, concentrate about altered nano-hydroxyapatite (HAp) by nano-manganese oxide (Mn3O4) as adsorbent material to expel iron particles from ground-water. Various parameters were concentrated to choice ideal states of evacuating, for example, contact time, pH, beginning fixation, a measurement of adsorbent, disturbance speed and temperature. Energy studies included first request (R2 = 0.95), pseudo-first-request (R2 = 0.936), second-request (R2 = 0.98), pseudo-second-request (R2 = 0.99), Elovich condition model (R2 = 0.97), intraparticle dissemination (R2 = 0.96), Natarajan and Khalaf (R2 = 0.91) were completed, the acquired outcomes uncovered that the pseudo-second-request is the best to portray the adsorption procedure on the grounds that the connection coefficient is moving toward one (R2 = 0.95). Adsorption isotherm was determined by utilizing Freundlich, Langmuir and Temkin constants, adsorption limit from the Langmuir model was 0.606 mg/g. Thermodynamic parameters (ΔG, H = −55 KJ/mol, and S = −152 (KJ/mol)) for the adsorption procedure were additionally determined and talked about.

Keywords: Adsorption, Groundwater, Hydroxyapatite, Iron Ions, Kinetic, Manganese Oxide, Nano Materials, Thermodynamic

Phosphorus Adsorption Isotherms of Some Low Activity Clay Soils As Influenced By Soil Properties and Their Effect on Fertilizer P Recommendations and Yield of Soybean (Glycine Max (L.) Merr.) In Benue State, Nigeria (Published)

The relationship between labile P sorbed to the soil surface and solution P can be described by a quantity-intensity relationship which shows P sorption or desorption as a function of P in the equilibrium solution. Twelve soils in Benue state representing Alfisols, Ultisols and Inceptisols were therefore used to examine the influence of soil properties on the shape and placement of their adsorption curves and yield of soybean. Sorption characteristics were determined in 0.01 M CaCl2 solutions of various P concentrations. For each soil, the amounts of P that gave 0.025, 0.05, 0.075, 0.100, 0.125, 0.150, 0.175, 0.200, 0.225, 0.250 mg kg-1 solution concentrations were estimated from adsorption curves. In the greenhouse, 4 kg of soil from each location was placed in plastic pots. Amount of P estimated from sorption study was added as KH2PO4. The treatments were laid out in Randomized Complete Block Design (RCBD) and soybean seed variety (TGx 1448-2E) was planted and growth and development observed to maturity. Optimum solution P concentration (SPC) was determined for each soil in relation to yield. At harvest, SPC that gave highest grain yield was evaluated for each soil and the quantity of P required (SPR) to achieve this concentration was calculated. Consequently, Odoba would require highest P fertilizer application (604.84 Kg P ha-1), (Tor-Donga 112.31, Abeda-Mbadyul 105.93) would require medium fertilization, (Utonkon 72.75, Katsina-Ala and Ofugo 67.64, Akoodo-Mbakor and Nor 61.26, Ogyoma 39.56, Otobi 33.18 and Abaji-Kpav 22.97 Kg P ha-1)would require low fertilization while Vanam (2.55 Kg P ha-1) would require the least.

Keywords: Adsorption, Fertilizer, Growth, Isotherms, Phosphorus, soils, soybean

Decolorization of Remazol Black B in Aqueous Suspension of TiO2 (Published)

Commercially available titanium dioxides from two different companies, one from Fluka, Switzerland (designated as n-TiO2) and another from Merck, Germany (designated as p-TiO2) were used for the removal of Remazol Black B (RBB) from aqueous solution. The experimental results reveal that p-TiO2 acts as an adsorbent as well as a photocatalyst owing to porous surface morphology, whereas n-TiO2 does not demonstrate adsorption characteristics due to its non-porous and granular surface morphology. Adsorption of RBB on p-TiO2 was found to occur rapidly and more than 40% dye was adsorbed within 5 minutes. Under irradiation of sunlight and UV-light, the photocatalytic activities of the p-TiO2 and n-TiO2 were also examined, and the results manifest the higher degradation efficiency of the p-TiO2 than n-TiO2. Different experimental parameters such as catalyst loading, pH, and concentration of solution have been varied to search optimum conditions. Photodegradation efficiency was also found higher under sunlight irradiation than UV-light.

Keywords: Adsorption, Kinetics, Langmuir-Hinshelwood, Photodegradation, Remazol Black


The adsorption of acid red 186(AR) onto activated carbon prepared from Libyan farms was studied, the effect of solution pH, contact time, adsorption dose and initial dye concentration was evaluated. The adsorption studied included Langmuir and Freundlish isotherms were applied to experimental results. The experimental results fitted very well to both adsorption isotherms. The mixture mono layer capacity obtained from Langmuir is q_e =7.62mg/g for activated carbon (100-45um) and q_e=7.194mg/g for activated carbon (lees than 45um).Therefore, activated carbon has the potential to be used as a low cost eco-friendly adsorbent for removal “activated carbon” dye from aqueous solution.

Keywords: Acidred186 dye, Activated carbon, Adsorption, Isotherms