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Shahat, A.*; Awual, M. R.; Khaleque, M. A.*; Alam, M. Z.*; Naushad, M.*; Chowdhury, A. M. S*
Chemical Engineering Journal, 273, p.286 - 295, 2015/08
被引用回数：293 パーセンタイル：99.54(Engineering, Environmental)The detection and removal of lead (Pb(II)) ions in water is essential for both human health and the natural environment. This study reported the feasibility of the large-pore diameter nano-adsorbent for capturing low level Pb(II) ions from aqueous solutions in a batch system, in order to comply with the toxicity limit for discharging wastewaters. The proposed Pb(II) detection system has good characteristics with high sensitivity and selectivity, robustness, easy operation, portability and use of a small sample volume. The competing ions effect was assessed with spiked samples and the nano-adsorbent exhibited high selectivity to Pb(II) ions with optimum color formation and the detection procedure can be easily applied to rapid on-site Pb(II) ions monitoring.
Awual, M. R.; Hasan, M. M.*; Khaleque, M. A.*
Sensors and Actuators B; Chemical, 209, p.194 - 202, 2015/03
被引用回数：218 パーセンタイル：99.69(Chemistry, Analytical)Selenium occurs naturally in the environment and is toxic at elevated concentrations, which has been a challenging issue for environmental scientists. This work was devoted to the detection and removal the selenium (Se(IV)) from aqueous solutions using organic ligand an immobilized conjugate adsorbent. The organic ligand of (3-(3-(methoxycarbonyl) benzylidene)hydrazinyl) benzoic acid was synthesized and indirectly immobilized onto the mesoporous silica. The adsorbent was applied to detect and remove Se(IV) in aqueous solutions at optimum conditions. This adsorbent exhibited high surface area-to-volume ratios and pores were uniform nanostructures.
Awual, M. R.; Khaleque, M. A.*; Ratna, Y.*; Znad, H.*
Journal of Industrial and Engineering Chemistry, 21, p.405 - 413, 2015/01
被引用回数：141 パーセンタイル：97.54(Chemistry, Multidisciplinary)A novel functionalized mesoporous silica based meso adsorbent was prepared for simple, efficient and rapid determination, sorption and recovery of trace palladium(II) in wastewater. The meso adsorbent was prepared by indirect immobilization of ((3(3(methoxycarbonyl)benzylidene)hydrazinyl)benzoic acid) onto the cage pored mesoporous silica. The optimum conditions were measured as a function of solution acidity, contact time, ion selectivity and adsorption isotherms models. The data revealed that meso-adsorbent offered simple and one step procedure without using high tech instruments. The determined detection limit and sorption capacity were 0.11 ppb and 184.50 mg/g, respectively. The meso-adsorbent can be repeatedly recycled without deterioration of the unique mesostructures and maintaining the same functionality for detection/sorption operations in next uses.
Awual, M. R.; Ismael, M.*; Khaleque, M. A.*; 矢板 毅
Journal of Industrial and Engineering Chemistry, 20(4), p.2332 - 2340, 2014/07
被引用回数：177 パーセンタイル：98.35(Chemistry, Multidisciplinary)The functionalized mesoporous silica based meso adsorbent was developed for ultra trace Cu(II) detection and removal from wastewater. The meso adsorbent was fabricated by direct immobilization of ligand onto mesoporous silica monoliths. The calculated HOMO LUMO small energy gap suggested that the electrons excitation according to the electron/energy transfer mechanism was evident in the intense of color complexation during selective detection and removal. The adsorbent was successfully applied in the determination and removal of Cu(II) ions in environmental samples.
Awual, M. R.; Rahman, I. M. M.*; 矢板 毅; Khaleque, M. A.*; Ferdows, M.*
Chemical Engineering Journal, 236, p.100 - 109, 2014/01
被引用回数：341 パーセンタイル：99.58(Engineering, Environmental)The pH dependent Cu(II) and Pd(II) ions detection and removal efficiency was investigated using ligand embedded mesoporous adsorbent. The adsorbent permits to fast and specific visualization of Cu(II) and Pd(II) ions detection and removal from aqueous media via a colorimetric signal visible to the naked eye. The adsorbent showed very high adsorption capacity (182.39 and 172.53 mg/g for Cu(II) and Pd(II), respectively) and adsorption uptake on the adsorbent reaching equilibrium was also very rapid with extreme selectivity in ionic competition.
Awual, M. R.; Khaleque, M. A.*; Ferdows, M.*; Chowdhury, A. M. S*; 矢板 毅
Microchemical Journal, 110, p.591 - 598, 2013/09
被引用回数：146 パーセンタイル：98.81(Chemistry, Analytical)The adsorbent was prepared by direct immobilization of 3-(3-(methoxycarbonyl)benzylidene)hydrazinyl)benzoic acid (MBHB) onto highly ordered mesoporous silica monoliths. The adsorbent enhanced the color formation by stable complexation as [Au(III)-MBHB]
complexes during recognition and adsorption operations. The data revealed that the recognition system was in a one-step and, even ultra-trace Au(III) concentrations without using highly sophisticated instruments implied the adsorbent was novel.
