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Md. Rabiul Awual 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
A novel conjugate adsorbent was developed for simultaneous Au(III) detection and recovery from urban mining waste. This adsorbent has the large surface area-to-volume ratios and uniformly shaped pores in the nanostructures in its cage cavities. Therefore, the conjugate adsorbent permitted to fast and specific Au(III) ions capturing via a colorimetric naked-eye visualization based on stable complexation [Au(III)–DHDM]n+ mechanism. The detection limit and sorption capacity of the novel adsorbent at optimum conditions was 0.22 mg/L and 183.42 mg/g, respectively. The design in such novel adsorbent offered a simple procedure for ultra-trace Au(III) detection and recover without using highly sophisticated instruments.
Md. Rabiul Awual,M.A. Shenashen,Akinori Jyo,Hideaki Shiwaku,Tsuyoshi Yaita 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
We developed a potentially high-performance adsorbent for sustainable treatment of soluble inorganic trace phosphate from water by zirconium(IV) loaded bifunctional fibers. In the presence of common Cl- and SO4 2-, phosphate adsorption was not adversely affected but slightly enhanced due to co-ion and Donnan invasion mechanism. Trace phosphorus (0.0143 mM) was also removed in presence of relatively high amounts of competing anions at high feed flow rate (850 h-1). In competitive arsenate and phosphate adsorption, this novel adsorbent slightly preferred phosphate to arsenate. The adsorbent is reversible and keeps remaining functionality to further reuse in many cycles.
Ultra-trace copper(II) detection and removal from wastewater using novel meso-adsorbent
Md. Rabiul Awual,Mohamed Ismael,Md. Abdul Khaleque,Tsuyoshi Yaita 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
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 N,N-bis(salicylidene)1,2-bis(2-aminophenylthio)ethane onto mesoporous silica monoliths. The calcu-lated 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. Therefore, the meso-adsorbent has been shown to have the potential to be used as an effective adsorbent for trace Cu(II) capturing from wastewater.
Md. Rabiul Awual,Md. Abdul Khaleque,Yeasmin Ratna,Hussein Znad 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
A novel functionalized mesoporous silica based meso-adsorbent was prepared for simple, efficient andrapid determination, sorption and recovery of trace palladium(II) in wastewater. The meso-adsorbentwas prepared by indirect immobilization of ((3-(3-(methoxycarbonyl)benzylidene)hydrazinyl)benzoicacid) onto the cage-pored mesoporous silica. The optimum conditions were measured as a function ofsolution acidity, contact time, ion selectivity and adsorption isotherms models. The data revealed thatmeso-adsorbent offered simple and one-step procedure without using high tech instruments. Thedetermined detection limit and sorption capacity were 0.11 mg/L and 184.50 mg/g, respectively. Themeso-adsorbent can be repeatedly recycled without deterioration of the unique mesostructures andmaintaining the same functionality for detection/sorption operations in next uses.
Md. Rabiul Awual,Md. Munjur Hasan 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
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. Theadsorbent was stable and easy to detect, adsorb and recover Pd(II) ions by charge transfer (intense p–ptransition) 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 ionicinterferences on detection and sorption were systematically evaluated. The determined maximumsorption capacity was 191.35 mg/g. The proposed method was applied successfully for extraction ofPd(II) in environmental wastewater samples.
Tahir Ali Sheikh,Mohammed M. Rahman,Abdullah M. Asiri,Hadi M. Marwani,Md. Rabiul Awual 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.66 No.-
In this approach, Co3O4@Er2O3 nanorods (NRs) were prepared by a wet-chemical method using reducing agents in alkaline medium. The resulting nanoparticles were characterized in details by UV/Vis and FT-IR spectroscopy, X-ray powder diffraction, Elemental dispersive analysis (EDS) coupled with field-emission scanning electron microscopy (FESEM). Co3O4@Er2O3NRs were deposited on a glassy carbon electrode (GCE) to give a selective sensor with a fast response toward 4-hexyl resorcinol (4-HR) in phosphate buffer phase (PBS) by electrochemical approach. The 4-HR sensor also displays good sensitivity, large linear dynamic range, lowest detection limit, and long-term stability, and enhanced electrochemical response. The calibration plot is linear over the 0.1 nM–0.01 M 4-HR concentration range. The sensitivity is ∼14.765 μAμM−1cm−2, and the detection limit is 64.29 pM (signal-to-noise ratio, at a SNR of 3). We also discuss possible future prospective uses of this doped metal oxide semiconductor nanomaterial in terms of chemical sensing.