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RISS 인기검색어
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- 저자 : Moonis Ali Khan (검색결과 18 건)
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Adsorption of DCM and MTBE from Aqueous Phase on Granular Activated Carbons: A Comparative Study
Khan, Moonis Ali,Lee, Sang-Hoon,Jeon, Byong-Hun 한국암반공학회 2010 Geosystem engineering Vol.13 No.3
The laboratory scale batch adsorption studies were conducted to investigate and compare the adsorption potential of granular activated carbons (GACs) for the removal of dichloromethane (DCM) and methyl tert-butyl ether (MTBE) from aqueous medium. The effect of various parameters such as solution pH, initial adsorbate concentration, contact time, dose of GACs, and temperature on the adsorption was studied. The optimum adsorption of DCM and MTBE on lignite granular activated carbon (LGAC) was observed at pH 7 while, optimum adsorption on bituminous granular activated carbon (BGAC) was observed in the pH between pH 6 and 8. The equilibrium data was fitted to Langmuir, Freundlich and Temkin models. Freundlich model best described the equilibrium adsorption. Contact time studies showed comparatively lower equilibration time for the adsorption of DCM on GACs. Kinetics modeling was done by applying pseudo-first-order, pseudo-second-order and Elovich models. Good agreement between experimental and theoretical adsorption capacity values along with higher regression coefficient values showed the validity of pseudo-second-order kinetics model. The thermodynamics studies showed endothermic and spontaneous process with randomness at the solid/solution interface. The adsorption of DCM and MTBE on GACs was interpreted to represent a physical adsorption.
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Khan, Moonis-Ali,Lee, Sang-Hoon,Kumar, Rajeev,Jeon, Byong-Hun 한국암반공학회 2010 Geosystem engineering Vol.13 No.1
In order to investigate the adsorption of dichloromethane (DCM) and methyl tert-butyl ether (MTBE) form aqueous solution onto granular activated carbons (GACs), kinetics, thermodynamics, and competitive ions studies were carried out. The optimal pH range for the adsorption of DCM and MTBE on GACs was 5.0 to 8.0. Contact time studies showed comparatively lower equilibration time for the adsorption of DCM on GACs. Isotherm studies favored the applicability of Freundlich model. Kinetics studies at different concentrations showed that the adsorption of DCM and MTBE on GACs follow the pseudo-second-order kinetics model. Weber and Morris model showed that the adsorption of MTBE at different concentration on coconut granular activated carbon (CGAC) has intra-particle diffusion as the rate controlling step. The thermodynamics parameters for the adsorption of DCM onto CGAC showed the exothermic nature of the adsorption process. The adsorption of DCM and MTBE on CGAC and wood granular activated carbon (WGAC) was physical adsorption in nature. Competitive ions studies revealed significant potential of CGAC for the removal of DCM even at higher concentrations.
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Moonis Ali Khan,Mahendra Kumar,Zeid Abdullah ALOthman 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Organic–inorganic hybrid anion-exchangemembranes were prepared from quaternized chitosan, anionexchangesilica precursor and poly(vinyl alcohol) by the sol–gel method in acidic condition (pH 2). Fourier transform infrared spectroscopy with attenuated total reflection mode, scanning electronmicroscopy and wide angle X-ray diffraction technique were used to confirm the functional groups in themembranes and their surface morphology. Physicochemical and electrochemical properties of theprepared membranes were determined in detail. The electro-osmotic study was conducted to determinethe equivalent pore radius of the membranes. The membranes were used in electrodialytic removal of(0.1, 0.2 and 0.4 M) NaCl solution at 3 V applied potential.
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Moonis Ali Khan,정우식,권오훈,정영미,팽기정,조승연,전병훈 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Comparative sorption study of dissolved manganese and cobalt ions onto alginate beads (ABs) andthermally activated nano-carbon beads (NCBs) was performed. Acidic functionalities dominate oversorbent surface. Elemental analysis confirmed that divalent calciumreplacement with heavy metal ionsmight be a possible sorption mechanism. Optimum metal uptake was observed at pH 8. Most of themetal ions (80–92%) were sorbed within 4 h, followed by a slower sorption stage. Mn(II) and Co(II)recovery was greater than 99% with 0.1 N HCl, and NCB could be repeatedly utilized for Mn(II) and Co(II)sorption with negligible loss in sorption capacity.
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전병훈,Moonis Ali Khan,이상훈,Rajeev Kumar 한국자원공학회 2010 Geosystem engineering Vol.13 No.1
In order to investigate the adsorption of dichloromethane (DCM) and methyl tert-butyl ether (MTBE)form aqueous solution onto granular activated carbons (GACs),kinetics, thermodynamics, and competitive ions studies were carried out. The optimal pH range for the adsorption of DCM and MTBE on GACs was 5.0 to 8.0. Contact time studies showed comparatively lower equilibration time for the adsorption of DCM on GACs. Isotherm studies favored the applicability of Freundlich model. Kinetics studies at different concentrations showed that the adsorption of DCM and MTBE on GACs follow the pseudo-second-order kinetics model. Weber and Morris model showed that the adsorption of MTBE at different concentration on coconut granular activated carbon (CGAC) has intra-particle diffusion as the rate controlling step. The thermodynamics parameters for the adsorption of DCM onto CGAC showed the exothermic nature of the adsorption process. The adsorption of DCM and MTBE on CGAC and wood granular activated carbon (WGAC) was physical adsorption in nature. Competitive ions studies revealed significant potential of CGAC for the removal of DCM even at higher concentrations.
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Adsorption of DCM and MTBE from Aqueous Phase on Granular Activated Carbons: A Comparative Study
전병훈,Moonis Ali Khan,이상훈 한국자원공학회 2010 Geosystem engineering Vol.13 No.3
The laboratory scale batch adsorption studies were conducted to investigate and compare the adsorption potential of granular activated carbons (GACs) for the removal of dichloromethane (DCM) and methyl tert-butyl ether (MTBE) from aqueous medium. The effect of various parameters such as solution pH, initial adsorbate concentration, contact time, dose of GACs, and temperature on the adsorption was studied. The optimum adsorption of DCM and MTBE on lignite granular activated carbon (LGAC) was observed at pH 7 while, optimum adsorption on bituminous granular activated carbon (BGAC) was observed in the pH between pH 6 and 8. The equilibrium data was fitted to Langmuir, Freundlich and Temkin models. Freundlich model best described the equilibrium adsorption. Contact time studies showed comparatively lower equilibration time for the adsorption of DCM on GACs. Kinetics modeling was done by applying pseudo-first-order,pseudo-second-order and Elovich models. Good agreement between experimental and theoretical adsorption capacity values along with higher regression coefficient values showed the validity of pseudo-second-order kinetics model. The thermodynamics studies showed endothermic and spontaneous process with randomness at the solid/solution interface. The adsorption of DCM and MTBE on GACs was interpreted to represent a physical adsorption.
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Mu. Naushad,Moonis Ali Khan,Zeid Abdullah ALOthman,Mohammad Rizwan Khan 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
The adsorptive potential of De-Acidite FF-IP resin for the removal of nitrate (NO3) from synthetic as well as commercially available bottled water samples was testified. Ultra-performance liquid chromatogra-phy–mass spectrometry (UPLC–MS) was utilized for detection and determination of NO3 . Optimum NO3 adsorption was observed at pH range 2 to 6. Kinetic studies revealed the applicability of pseudofirst-order kinetic model for analyzed concentration range (100–300 mg/L) while, the equilibration time (25 min) was independent of initial NO3- concentration. The breakthrough capacities in Milli-Q and tap water were 35 and 30 mg/g, respectively.
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Aqueous phase degradation of methyl paraben using UV-activated persulfate method
Dhaka, Sarita,Kumar, Rahul,Khan, Moonis Ali,Paeng, Ki-Jung,Kurade, Mayur B.,Kim, Sun-Joon,Jeon, Byong-Hun Elsevier 2017 Chemical Engineering Journal Vol.321 No.-
<P><B>Abstract</B></P> <P>Methyl paraben (MP), a widely used preservative, exhibits endocrine-disrupting properties with estrogenic activities. The aqueous phase degradation of MP, using UV-activated persulfate method, was investigated in the present study. The combination of UV irradiation and persulfate anion successfully degraded MP showing 98.9% removal within 90min. A quenching experiment using ethanol (EtOH) and <I>tert</I>-butyl alcohol (TBA) showed the presence of both radicals (OH<SUP> </SUP> and SO<SUB>4</SUB> <SUP> –</SUP>) in the system; near neutral pH SO<SUB>4</SUB> <SUP> –</SUP> radical was the major species. The influence of various factors such as persulfate dose, initial MP concentration, solution pH, and water matrix components on the degradation kinetics was examined in view of the practical applications of the developed process. The degradation rate of MP was considerably increased as the amount of persulfate increased. The degradation of MP in the UV/persulfate system was pH dependent and more promising near neutral pH (6.5) conditions. The presence of anions such as Cl<SUP>−</SUP>, HPO<SUB>4</SUB> <SUP>2−</SUP> and HCO<SUB>3</SUB> <SUP>−</SUP> showed inhibitory effect towards MP degradation. The presence of humic acid also suppressed the degradation efficiency of MP. The reaction rate followed pseudo-first-order kinetics for all of the degradations. The degradation of MP by UV/persulfate treatment led to the production of seven transformation byproducts, which were identified using ultra-high-performance liquid chromatography-mass spectrometry (UPLC-MS). A degradation pathway for MP degradation was also proposed. The results of the present study reveal that the UV/persulfate process could be an effective approach to remove MP from aqueous solutions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Aqueous phase MP degradation using UV/persulfate method was investigated. </LI> <LI> Degradation rate of MP followed pseudo-first-order kinetics. </LI> <LI> MP degradation was pH dependent. </LI> <LI> HCO<SUB>3</SUB> <SUP>−</SUP>, HPO<SUB>4</SUB> <SUP>2−</SUP> and humic acid exhibited inhibitory effect on MP degradation. </LI> <LI> Hydroxylation and hydrolysis were possible pathways of degradation of MP. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Mohamad Rasool Malekbala,Moonis Ali Khan,Soraya Hosseini,Luqman Chuah Abdullah,Thomas S.Y. Choong 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Surfactant modified carbon coated monolith was used as an adsorbent for methylene blue (MB)adsorption. Effects of pH, salt, contact time, initial dye concentrations and temperature on dyeadsorption were studied. Higher solution pH favoured MB adsorption. Furthermore, kinetics studyshowed that the adsorption could be better represented by the pseudo-second-order model. Linear andnon-linear isotherm studies revealed better fitting of Langmuir model to adsorption data with maximummonolayer adsorption capacity 388 mg/g. The adsorption was found to be spontaneous andendothermic. Desorption studies indicate that 0.1 N HCl exhibits higher elution efficiency (82.1%) withappreciable quantitative MB recovery.
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