http://localhost:80/xmlui/handle/123456789/17204 2026-04-05T19:34:56Z 2026-04-05T19:34:56Z K. H. Shah S. Mustafa A. Naeem M. Waseem T. Ahmad http://localhost:80/xmlui/handle/123456789/18668 2023-03-13T09:00:51Z 2010-12-06T00:00:00Z

Title: KINETIC INVESTIGATION OF CHROMIUM (III) REMOVAL BY STRONG ACID EXCHANGER AMBERLYST-15(H+ ) Authors: K. H. Shah; S. Mustafa; A. Naeem; M. Waseem; T. Ahmad Abstract: Cr(III) sorption on the strong acid exchanger Amberlyst-15(H+ ) is studied as a function of time and temperature using basic chromium sulphate [Cr4(SO4)5(OH)2] solution. Increase in temperature has a positive effect on Cr(III) sorption. The pH is observed to decrease during Cr(III) sorption with the passage of time. The film diffusion model is applied to explain the kinetic data and the exchange rate is found to be governed by the film diffusion process. From the rate constant values, the energies of activation are calculated using the Arrhenius equation. The low activation energy confirmed the diffusional nature of the sorption process.

2010-12-06T00:00:00Z N. H. Hamodi K. A. Papadopoulou Y. Iqbal http://localhost:80/xmlui/handle/123456789/18666 2023-03-13T08:46:39Z 2010-09-04T00:00:00Z

Title: THERMAL ANALYSIS AND IMMOBILISATION OF SPENT ION EXCHANGE RESIN IN BOROSILICATE GLASS Authors: N. H. Hamodi; K. A. Papadopoulou; Y. Iqbal Abstract: The underground disposal of waste arising from the nuclear industry needs constant evaluation in order to improve it through minimizing the volume and cost by reducing the amount of glass used without compromising the safety of any leakage from the radioactive waste form. The immobilization of the spent resin (NRW-40) in borosilicate glass was investigated to meet the acceptance criteria for disposal of nuclear waste. The organic mixed bed resin in granular form was used as a waste target. The analysis of surrogate resin doped with radioactive and non-radioactive cesium (Cs) and cobalt (Co) was carried out to investigate their thermal and chemical properties and their compatibility with an alkaline borosilicate glass. Thermal analysis indicates that the structural damage caused by 1 mSv gamma radiation to the radioactive resin has altered its properties in comparison with the non-radioactive resin, using the same amount of cesium (8.88 wt%) and cobalt (1.88 wt%) in both resins. The immobilization of residue shows that the excess sulfur in the residue caused phase crystallization in the final glass matrix. It was found that the volatilization of Cs-137 and Co-60 from the successful radioactive resin-glass matrix (HG3-IER-500) were more than that in the non-radioactive resin-glass matrix (HG-3-IEX-500). The study demonstrates comprehensive experimental and analytical work and shows that it is possible to minimize the volume of the waste while keeping the required safety levels; however, further research needs to be carried out in this area.

2010-09-04T00:00:00Z Salma Gul Anwar-ul-Haq Ali Shah Salma Bilal http://localhost:80/xmlui/handle/123456789/18660 2023-03-13T08:21:18Z 2010-07-03T00:00:00Z

Title: THERMOGRAVIMETRIC STUDY OF POLYANILINE-DODECYLBENZENE SULFONIC ACID SALT Authors: Salma Gul; Anwar-ul-Haq Ali Shah; Salma Bilal Abstract: Soluble polyaniline (PANI-DBSA) was synthesized by inverse emulsion polymerization. Dedecylbenzene sulfonic acid (DBSA) was selected as a surfactant because it also acts as a dopant. In this process a mixture of chloroform and 2-butanol was used as a dispersing medium for the first time. The synthesized polymer is found to be soluble in common organic solvents such as DMSO, DMF, and Chloroform and in 2:1 mixture of toluene and 2-propanol. The conducting form of PANI was confirmed by X-ray diffraction and UV-Vis spectroscopy. The thermal stability was determined by thermogravimetric analysis. This technique was also used to calculate energy of activation (Ea) for the degradation of plymer using Horwitz & Metzger, Coats & Redfern and Chan et al. methods.

2010-07-03T00:00:00Z Afzal Khan Carmen Jimenez Deschanvres, Jean-luc http://localhost:80/xmlui/handle/123456789/18658 2023-03-13T08:18:35Z 2010-07-02T00:00:00Z

Title: ANNEALING EFFECTS ON SURFACE MORPHOLOGY, THICKNESS AND CHEMICAL PHASES OF Sr-Cu-O THIN FILM DEPOSITED BY MOCVD Authors: Afzal Khan; Carmen Jimenez; Deschanvres, Jean-luc Abstract: The annealing process for obtaining SrCu2O2 out of the as-deposited Sr-Cu-O films by MOCVD was studied. Whatever the deposition condition may be, the as-deposited films are always composed of SrCO3 and CuO. As-deposited films were annealed in various gaseous atmospheres at different temperatures and for different annealing durations to obtain pure SrCu2O2 phase. Annealing effects on the as-deposited film include; crystallization of the film, transformation of the chemical phases, sintering of the grains, formation of cracks, reduction of the film thickness and diffusion of film contents into the substrate. Transformations of chemical phases depend on oxygen partial pressure, temperature and duration of annealing and rate of cooling. Formations of cracks were found to depend on heating and cooling rate and duration of annealing. Diffusion of film content into the substrate depends on duration and temperature of annealing and on the nature of substrate. Duration of annealing for obtaining pure SrCu2O2 phase also depends on annealing temperature as well as on heating and cooling rate

2010-07-02T00:00:00Z