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Articles by M.A. Halim
Total Records ( 7 ) for M.A. Halim
  M.S. Rana , M.A. Halim , S.A.M. Waliul Hoque , Kamrul Hasan and M.K. Hossain
  The present research investigated the arsenic removal performance of prepared and commercial crab shell chitosan by adsorption filtration method. The ability of chitosan to remove arsenic from prepared arsenic contaminated solution was examined by Atomic Absorption Spectrometry (AAS). It is found that the saturation volume of prepared chitosan for l0 mg L-1 As3+/As5+ solution was 8.55 L and its arsenic removal capacity was 6244.2 mg kg-1. For commercial chitosan, the saturation volume for low and high molecular weight chitosan was 1.3 and 0.45 L and their arsenic removal capacity were 461.8 and 149.5 mg kg-1, respectively. The FT-IR study also confirmed that prepared chitosan’s arsenic removal capacity was higher than that of low and high molecular weight commercial chitosan due to the free amino group.
  M.A. Halim , S.A. Nessa , A.K.L. Rahman , D.A. Chowdhury and M.A. Salam
  A number of diazocoupling products of molybdenum (VI) chelates of β-diketones with various types of aryldiazonium ions have been prepared. Aryldiazonium ions are obtained through the diazotization of aniline and substituted aniline using sodium nitrite and hydrochloric acid. The prepared diazocoupled products were studied by their analytical data, magnetic moment, molar conductance, electronic, infrared and 1HNMR spectral studies. The presence of vN=N mode in the IR spectra and absence of methane proton signal in the 1HNMR spectra of the prepared diazocoupled products indicate the occurrence of diazocoupling reaction. The molar conductance values indicate the non-electrolytic nature of the diazocoupled products. The electronic spectra and the dia magnetic behavior are indicative of the presence of +6 oxidation state of molybdenum. The structures of the synthesized diazocoupled products of molybdenum (VI) are likely to be octahedral.
  M.A. Halim , S.A.M. Waliul Hoque , M.K. Hossain , A.H.M. Saadat , M.A. Goni and M. Saiful Islam
  Laterite soil samples were studied to monitor their efficiency in removing arsenic from contaminated water by adsorption filtration method in laboratory condition. Prepared 10 mg L-1 solution of As3+/As5+ was passed through the six soil samples. At room temperature, a batch of three different samples adsorbs 1010, 925 and 932.5 mg kg-1 of arsenic and their removal efficiency were found to be 58.74, 65.32 and 65.39%, respectively. At 100 °C temperature, the three specimens studied show the adsorptivity of 54.40, 63.47 and 58.69%, while the respective amount adsorbed was calculated 848, 694 and 760 mg kg-1, respectively. Studied IR spectra of the sample of different temperature gradients revealed that the efficiency of a particular composite is high temperature sensitive and the most important and noticeable performance of soil samples is observed when the samples are treated at room temperature, this is the optimum temperature for these soil samples. Above this temperature the efficiency decline gradually.
  M.S. Rana , M.A. Halim , S. Safiullah , M. Mamun Mollah , M.S. Azam , M.A. Goni , M. Kamal Hossain and M.M. Rana
  The study focuses on potential of using crab shell chitosan as a low-cost biosorbent, for heavy metals removal from aqueous solutions in an adsorption filtration system. Chitosan was synthesized from chitin by the treatment of strong alkali solution under reflux condition and chitin was extracted from crab shell followed by decalcification and deproteinization treatment. Spectrometric (AA and UV) method was employed to detect the heavy metals concentration. Prepared 10 mg L-1 solutions of zinc, lead, cadmium, cobalt, nickel, chromium, manganese and iron were passed through the 5 g of chitosan separately and it was found that chitosan was excellent adsorbent in removing mentioned heavy metals. The removal efficiency of chitosan was in the following order Mn>Cd>Zn>Co>Ni>Fe>Pb>Cr. The result also showed that the time required for 100% breakthrough of prepared chitosan for Mn and Zn was approximately 27 and 23 h whereas it was only 16 h for both Cr and Pb, respectively. The research revealed that prepared chitosan showed better removal performance for Mn, Cd, Zn whereas the removal efficiency was satisfactory for Co, Ni and Fe but it exhibited relatively least performance for Pb and Cr.
  M.A. Ali and M.A. Halim
  Addition of white sesame flour to wheat flour with different incorporation levels (5, 10.15%) in bread blend led to significant increase in nutritive value but with inferior quality with respect to crumb, crust color and bread volume. Proximate analysis of the wheat and white sesame flour were carried out. The rheological prosperities of the blends of wheat flour and white sesame flour were determined using a farinograph. To alleviate these inferior effects, natural improvers were used. Rheological test revealed, increase in water absorption value, dough development time and dough stability for all dough prepared from white sesame-wheat flour blend in presence of the two types of improvers. Characteristics of bread prepared from white sesame-wheat flour blend using the two improvers, revealed better result as for crumb color, crust color, aroma, texture and taste as compared to control bread, with a noticeable increase in bread volume.
  M.A. Halim , S. Safiullah , M. S. Rana and M.A. Goni
  Iron based Titanium dioxide composites were prepared from beach sand of Cox`s Bazaar, Bangladesh, to monitor their efficiency in removing arsenic from contaminated water by column adsorption filtration method in laboratory condition. It is observed that the prepared Iron based Titanium dioxide composite (ITDO-1 and ITDO-2) can do remove 100% both states of arsenic from the prepared 10 mg L-1 arsenic solution up to the breakthrough volume (ITDO-1 at 3.1 L and ITDO-2 at 1.9 L, for 4 g of column material) in each case. Adsorbed arsenic is amounted to 4871 mg kg-1 of composite ITDO-1 and removal efficiency is found 72.46% up to the saturation volume (7.35 L) while the corresponding figure for composite ITDO-2 is 6708 mg kg-1 of material with an efficiency of 62.92% up to saturation volume (7.5 L). This study also revealed that the residue (ITDO-3) left after the prepared ITDO-1 and ITDO-2, exhibited least performance on removing arsenic.
  M.M. Islam , M.A. Halim , S. Safiullah , S.A.M. Waliul Hoque and M. Saiful Islam
  The present research was carried out with eight specimens of sludge from Apex Weaving and Finishing Mills Ltd. Gazipur, Bangladesh, to determine the concentration of heavy metals (Pb, Cd, Zn, Cu, Cr, Fe and Mn) in the sludge samples and an assessment was made with the heavy metal content in agricultural soil. Atomic Absorption Spectrometry (AAS) method was employed for the analysis of Pb, Cd, Cr, Zn, Cu and UV-Spectrophotometric method was used for Fe and Mn, respectively. The mean concentration of lead (Pb), cadmium (Cd), chromium (Cr) was 79.13, 6.27, 4.35 mg kg-1 and for zinc (Zn), copper (Cu), iron (Fe) and manganese (Mn) it was 7.90, 1.34, 195.2 and 3.97 g kg-1, respectively. All the heavy metal concentrations except chromium in the sludge samples were higher than that of in agricultural soil. In addition, the study concluded that pre-treatment process for reducing the amount of heavy metal is mandatory before the sludge can be used as a soil conditioner or fertilizer in the agricultural soil.
 
 
 
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