Naushad, M.*; Alothman, Z. A.*; Awual, M. R.; Alfadul, S. M.*; Ahamad, T.*
Desalination and water treatment, 57(29), p.13527 - 13533, 2016/06
In this study, the effectiveness of amberlite IRA-938 resin for Rose Bengal (RB) dye removal from aqueous phase was evaluated. For the RB dye removal, equilibrium was achieved within 45 min because rate of adsorption was fast. The adsorption equilibrium for RB dye onto amberlite IRA-938 resin was in good agreement with Langmuir adsorption isotherm. It was observed that amberlite IRA-938 resin had excellent RB dye adsorption capacity. The environmental applicability of amberlite IRA-938 resin was performed in the separation of RB dye from the tap water sample spiked with 50 mg/L RB dye solution. The breakthrough and exhaustive capacity were 100 and 325 mg/g, respectively.
Awual, M. R.; 宮崎 有史; 田口 富嗣; 塩飽 秀啓; 矢板 毅
Chemical Engineering Journal, 291, p.128 - 137, 2016/05
A novel macrocyclic ligand of di-o-benzo-p-xylyl-28-crown-8-ether (DOBPX28C8) was prepared and successfully anchored onto the mesoporous silica for the fabrication of mesoporous hybrid adsorbent (MHA) using direct immobilization approach and serving as an efficient adsorbent for Cs removal. The high amount of K (7.69 mM) was slightly affected the Cs adsorption because the hydration radius of K is close to the Cs than that of the other cation of Na. Also the Cs adsorption efficiency was more higher even in the presence of 1,025 fold K and 1,739 fold Na, respectively. The functional group of DOBPX28C8 ligand embedded onto the mesoporous silica exhibited more conformational freedom, and the benzene ring in para position was consolidated for pai-electron orientation with expanding the ring size of DOBPX28C8 for easy capturing with high selectivity and adsorption ability towards the Cs.
Naushad, M.*; Khan, M. R.*; Alothman, Z. A.*; Awual, M. R.
Desalination and water treatment, 57(13), p.5781 - 5788, 2016/03
The removal of bromate from aqueous medium by Amberlite IRA-400 anion exchange resin was explored in order to identify the capability of this resin to remove bromate from real water samples. The effects of several physicochemical parameters such as contact time, initial bromate concentration, initial pH, and temperature were studied. The concentration of bromate was determined using ultra-performance liquid chromatography tandem mass spectrometry. The adsorption kinetics and isotherms were well fitted by pseudo-second-order model and Freundlich model, respectively.
Awual, M. R.; 矢板 毅; 宮崎 有史; 松村 大樹; 塩飽 秀啓; 田口 富嗣
Scientific Reports (Internet), 6, p.19937_1 - 19937_10, 2016/01
A novel macrocyclic ligand of -benzo--xylyl-22-crown-6-ether (OBPX22C6) was developed and successfully immobilized onto mesoporous silica for the preparation of hybrid adsorbent. The benzene ring electron is the part of crown ether of OBPX22C6 for easy orientation of the macrocyclic compound for making the electron donation with Cs complexation. The results clarified that the Cs removal process was rapid and reached saturation within a short time. Considering the effect of competitive ions, sodium did not markedly affect the Cs adsorption whereas potassium was slightly affected due to the similar ionic radii. Due to its high selectivity and reusability, significant volume reduction is expected as this promising hybrid adsorbent is used for Cs removal in Fukushima wastewater.
Awual, M. R.; Eldesoky, G. E.*; 矢板 毅; Naushad, M.*; 塩飽 秀啓; Alothman, Z. A.*; 鈴木 伸一
Chemical Engineering Journal, 279, p.639 - 647, 2015/11
A novel Schiff base ligand based nano-composite adsorbent (NCA) was prepared for the detection and removal of copper (Cu(II)) ions in wastewater samples. Upon the addition of Cu(II) ions to NCA at optimum conditions, the clear color was visible to the naked-eye in the detection system. This NCA exhibited an obvious color change from yellowish to dark green in the presence of Cu(II) ions in aqueous solution. The NCA could detect the Cu(II) ions over other foreign ions with high sensitivity and selectivity. For adsorption behaviour, influences several factors such as solution pH, contact time, concentration for Cu(II) ion adsorption was investigated by batch experiment in detail. The results showed that neutral solution pH was suitable to get optimum Cu(II) ions adsorption.
Awual, M. R.; 矢板 毅; 塩飽 秀啓; 鈴木 伸一
Chemical Engineering Journal, 276, p.1 - 10, 2015/09
The organic ligand of N,N(octane-1,8-diylidene)di(2-hydroxyl-3,5-dimethylaniline) was synthesized and anchored onto inorganic mesoporous materials by direct immobilization method for Co(II) ions capturing from waste samples. The interaction of this material with various metal ions was evaluated, and it exhibited distinct color change from whitish to green in the presence of Co(II) ions, detectable even to the naked-eye. The effects of solution pH, contact time, competing ions and initial concentration on Co(II) sorption on NCA were investigated under optimum conditions. The data also clarified that the NCA adsorbent is an efficient and eco-friendly adsorbent for Co(II) treatment. Therefore, the proposed adsorbent can be considered as a potential candidate for Co(II) ions monitoring and removal from wastewater in large-scale operations.
Naushad, M.*; Alothman, Z. A.*; Alam, M. M.*; Awual, M. R.; Eldesoky, G. E.*; Islam, M.*
Journal of the Iranian Chemical Society, 12(9), p.1677 - 1686, 2015/09
A new surfactant-based nanocomposite cation exchanger, sodium dodecyl sulfate-Th(IV) tungstate (SDS-TT) was prepared by the sol-gel method. The SDS-TT was characterized by FTIR, XRD, TGA, SEM, EDS and TEM. The distribution studies for various metal ions on SDS-TT were performed in different acidic mediums. On the basis of distribution coefficient values, SDS-TT was found to be selective for Cu metal ion. SDS-TT was successfully used for the quantitative separation of Cu from the synthetic mixture, pharmaceutical formulation and brass sample.
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
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.
Naushad, M.*; Alothman, Z. A.*; Awual, M. R.; Alam, M. M.*; Eldesoky, G. E.*
Ionics, 21(8), p.2237 - 2245, 2015/08
In the current study, Ti(IV) iodovanadate cation exchanger (TIV) was synthesized and applied for the removal of Pb and Hg metal ions from the aqueous medium. The adsorption studies were performed by the batch techniques and adsorption parameters viz. contact time, pH, initial metal ion concentration, and temperature were also investigated. The optimum adsorption of Pb and Hg were observed at pH6. The pseudo-second order equation represented the adsorption kinetics with high correlation coefficient. Langmuir model showed the best fitting to the isotherm equilibrium data, with a maximum adsorption capacity of 18.8 mg/g for Pb and 17.2 mg/g for Hg.
Shahat, A.*; Awual, M. R.; Naushad, M.*
Chemical Engineering Journal, 271, p.155 - 163, 2015/07
Ligand anchored functional nanomaterials are increasingly gaining interest as efficient materials for various types of toxic pollutants. In this study, the organic ligand was densely anchored onto the mesoporous silica by the building-block approach as facial adsorbent, characterized and then examined for the cobalt (Co(II)) ion detection and removal from aqueous solutions. This study also examined the possibility of using facial adsorbent to remove low concentrations of Co(II) ions from water solution. The sorption isotherms fit the Langmuir sorption model well and the maximum Co(II) ion sorption capacity was 157.73 mg/g. The effective eluent of 0.20M HCl was used to elute the Co(II) from the facial adsorbent, and the adsorbent was simultaneously regenerated into the initial form after rinsing with water.
Awual, M. R.; 矢板 毅; 鈴木 伸一; 塩飽 秀啓
Journal of Hazardous Materials, 291, p.111 - 119, 2015/06
This work reports the selenium (Se(IV)) detection and removal from water by ligand functionalized organic-inorganic based novel composite adsorbent. The adsorbent exhibited distinct color change in the presence of various concentrations of Se(IV). This was characterized by UV-vis spectroscopy, and the color change was observed by naked-eye observation. The data fitted well to the Langmuir isotherm model, and the maximum Se(IV) sorption capacity was 111.12 mg/g. The presence of diverse competing ions did not affect the Se(IV) sorption capacity, and the adsorbent had almost no sorption capacity for these coexisting ions, which suggests the high selectivity to Se(IV) ions.
Awual, M. R.
Chemical Engineering Journal, 266, p.368 - 375, 2015/04
The soft donor atoms containing organic ligand was prepared and then successfully immobilized onto the ordered nanomaterials to form facial adsorbent for copper(II) ions removal from water. The soft donor atoms of this ligand are actively working to make a stable complex formation with Cu(II) at a neutral pH region. It is also noted that the organic ligand was acted as receptors and able to transfer chemical information into analytical signals by charge transfer transudation during the detection operation.
Awual, M. R.; Hasan, M. M.*; Shahat, A.*; Naushad, M.*; 塩飽 秀啓; 矢板 毅
Chemical Engineering Journal, 265, p.210 - 218, 2015/04
In this study, the organic ligand of 4-dodecyl-6-((4-(hexyloxy)phenyl)diazenyl) benzene-1,3-diol (DPDB) and mesoporous silica have been used to prepare the nano-composite adsorbent. The nano-composite adsorbent was fabricated by indirect immobilization of DPDB onto the mesoporous silica. The experimental data clarified that the Ce(III) was detected and adsorbed by the adsorbent at pH 2.50. The limit of detection for Ce(III) ions by the adsorbent was 0.12 microgram/L and the sorption capacity was 150.37 mg/g at optimum conditions. The proposed adsorbent allowed the sensitive, selective, easy to use, cost-effective, high efficiency, fast kinetics and stable capturing of Ce(III) ions even in the presence of diverse competing ions.
Awual, M. R.; Hasan, M. M.*; Naushad, M.*; 塩飽 秀啓; 矢板 毅
Sensors and Actuators B; Chemical, 209, p.790 - 797, 2015/03
In this study, we have developed S and N containing ligand of 5-tert-butyl-2-hydroxybenzaldehyde thiosemicarbazone. The organic ligand was anchored onto the mesoporous silica by an indirect method for the preparation of composite adsorbent. The adsorbent can detect Pd(II) ions at ultra-trace levels and recover the Pd(II) with high sorption capacity and efficiency. The adsorption isotherm data were well fitted with the Langmuir model, and the maximum sorption capacity of the composite adsorbent was 171.65 mg/g, which was close to the equilibrium sorption capacity.
Awual, M. R.; Hasan, M. M.*; Khaleque, M. A.*
Sensors and Actuators B; Chemical, 209, p.194 - 202, 2015/03
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.; Hasan, M. M.*; Znad, H.*
Chemical Engineering Journal, 259, p.611 - 619, 2015/01
The functional group containing organic ligand was developed and then successfully anchored onto mesoperous silica for the preparation of nano-conjugate adsorbent. After fabrication, the ligand kept open functionality for capturing Pd(II) under optimum conditions. The adsorbent exhibited the distinct color formation after adding the Pd(II) ions both in solid and liquid states. The base metal of Cu(II) and Zn(II) did not hamper the Pd(II) sorption ability of adsorbent in the acidic pH region. Therefore, it was expected that the Pd(II) could be separated from other hard metal ions by the adsorbent. Therefore the proposed adsorbent can be considered as a potential candidate for Pd(II) capturing from waste samples.
Awual, M. R.; Khaleque, M. A.*; Ratna, Y.*; Znad, H.*
Journal of Industrial and Engineering Chemistry, 21, p.405 - 413, 2015/01
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.; Hasan, M. M.*
Journal of Industrial and Engineering Chemistry, 21, p.507 - 515, 2015/01
A simple and sensitive method was applied for determination and extraction of trace level palladium(II) in wastewater by using functionalized mesoporous silica based fine tuning mesoporous adsorbent. The adsorbent was stable and easy to detect, adsorb and recover Pd(II) ions by charge transfer complexation mechanism. The optimum experimental conditions such as pH, contact time, initial concentration, selectivity and sensitivity, type and amount of eluent for elution and various ionic interferences on detection and sorption were systematically evaluated. The determined maximum sorption capacity was 191.35 mg/g. The proposed method was applied successfully for extraction of Pd(II) in environmental wastewater samples.
Awual, M. R.; Hasan, M. M.*
Sensors and Actuators B; Chemical, 206, p.692 - 700, 2015/01
The nitrogen donor ligand was functionalized with polarable mesoporous silica as composite adsorbent, by a cost-effective and environmentally friendly procedure, for highly selective Cu(II) ions detection and removal from water. The composite adsorbent permitted fast and specific Cu(II) ions capturing via colorimetric naked eye detection based on stable complexation mechanism. The adsorbent was selective toward Cu(II) as shown by a light yellow to green color change. This was characterized by UVvis spectroscopy and the color change was observed for the visual detection of Cu(II) ions. The data also confirmed that the adsorbent is a cost-effective and environmentally friendly procedure for Cu(II) treatment.
Awual, M. R.; Hasan, M. M.*; Shahat, A.*
Sensors and Actuators B; Chemical, 203, p.854 - 863, 2014/11
In this study, we designed ligand immobilized mesoporous adsorbent for ultra-trace Pb(II) monitoring and removal from wastewater. This adsorbent exhibited the large surface area-to-volume ratios and uniformly shaped pores in case cavities, and its active sites kept open functionality to taking up Pb(II). The data revealed that the adsorbent was able to detect the ultra-trace Pb(II) ions with high sensitivity and selectivity by charge transfer transduction mechanism. Then the adsorbent proved to have an efficient ability for continuous Pb(II) monitoring and removal even on-site and in situ chemical analyses.