Prospective Cohort Study

Adsorption of dyes and heavy metal ions by chitosan composites: A review

Adsorption and desorption of different organic matter fractions on iron oxide

Removal of a cationic dye from aqueous solutions by adsorption onto bentonite clay.

Adsorption of dyes from aqueous solutions on activated charcoal.

Adsorption of uranium on activated charcoal has been studied as a function of shaking time, amount of adsorbent, pH, concentration of adsorbate, and temperature. Uranium adsorption obeys the Langmuir isotherm. ΔHΔ and ΔSΔ were calculated from the slope and intercept of plots of ln KD vs 1/T. The influence of different anions and cations on uranium adsorption has been examined. The adsorption of other metal ions on activated charcoal has been studied under specified conditions to check its selectivity; consequently, uranium was removed from Cs, Ba, Zn, and Co. More than 98% adsorbed uranium on activated charcoal can be recovered with 65 mL of 3 M HNO3 solution. A wavelength dispersive x-ray fluorescence spectrometer was used for measuring uranium concentration.

Selective adsorption of uranium on activated charcoal from electrolytic aqueous solutions

The acetates of magnesium, nickel, copper, manganese, sodium and barium were subjected to thermal decomposition by means of thermogravimetric techniques (TG) under a constant flow of nitrogen. The decompositions occurred in steps and the kinetics of every set of reactions was determined by the Coats and Redfern method. These results were analysed to establish the decomposition kinetics and hence to calculate activation energies. The activation energies were also determined by applying the Horowitz-Hugh method, which yielded similar results.

Kinetics of thermal decomposition of metal acetates

Surface parameters of the activated charcoal were measured using precise instrumental techniques for dehydration, carbon content, trace metals impurities, anions, bulk, tap and true densities, surface area, pore volume, porosity and average particle diameter. The adsorption of Sr2+, Ce3+, Sm3+, Gd3+, Th4+ and UO
 2
 2+
 ions on activated charcoal from aqueous solution was studied as a function of temperature. Thermodynamic parameters such as ΔHH
0 and ΔS
0 were calculated from the slopes and intercepts of the linear variation of lnK
1 vs. 1/T, whereK
3 is obtained from Langmuir equation. The results show endothermic heats of adsorption, but negative free energy values indicate that the adsorption process of metal ions on activated charcoal is favored at high temperature. The value of isosteric heat of adsorption, calculated from the Clausius-Clapeyron equation, shows that the surface of the activated charcoal is heterogeneous with respect to activity. A wavelength dispersive x-ray fluorescence spectrometer was used for measuring the concentration of metal ions.

Surface characterization and thermodynamics of adsorption of Sr2+, Ce3+, Sm3+, Gd3+, Th4+, UO 2 2+ on activated charcoal from aqueous solution

Objective: To determine the causes of short stature in children with special emphasis on growth hormone deficiency. Study Design: Case series.

Etiology of short stature in children.

In this research paper, efforts have been made to document the traditional knowledge of economically important plants of Kaghan Valley. Studies were conducted during 2009 to 2010 in the months of June to August. As a result, 102 important plant species belonging to 93 genus and 61 families were recorded from all available sources including botanical name, local name, status, part used and economical importance. These plants were classified for their traditional medicinal and economic uses but many of these plants have more than one local use. The plants were used commonly as fuel wood, forage/fodder, medicinal, edible, shelter making, vegetables, timber wood, furniture wood etc. It is expected that this effort will also serve as an educational tool for students, researchers and plant taxonomists.

	 

	Key words: Traditional knowledge, economically important plants, Kaghan Valley.

https://africaneditors.org/journal/JMPR/full-text-pdf/31544-128589

Muhammad Afzal

Papers

Selective adsorption of uranium on activated charcoal from electrolytic aqueous solutions

Kinetics of thermal decomposition of metal acetates

Surface characterization and thermodynamics of adsorption of Sr2+, Ce3+, Sm3+, Gd3+, Th4+, UO 2 2+ on activated charcoal from aqueous solution

Etiology of short stature in children.

Studies on traditional knowledge of economically important plants of Kaghan Valley, Mansehra District, Pakistan