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Pawar, Radheshyam R.,Lalhmunsiama, Radheshyam R.,Kim, Munui,Kim, Jae-Gyu,Hong, Seong-Min,Sawant, Sandesh Y.,Lee, Seung Mok Elsevier 2018 Applied clay science Vol.162 No.-
<P><B>Abstract</B></P> <P>The present communication addresses the removal of toxic lead, cadmium, and arsenic using iron oxide modified clay-activated carbon composite beads from aqueous solutions. The SEM-EDX analysis was conducted to study the heterogeneity of the surface and the elemental composition of the composite beads. The specific surface area of the composite beads was found to be 433 m<SUP>2</SUP>/g. Furthermore, the XRD pattern indicates the intercalation of iron particles between the layers of bentonite clay. The FT-IR analysis suggests that the hydroxyl, carboxyl, and Fe-O were the major functional groups responsible for the removal of lead, cadmium, and arsenic. The Langmuir monolayer sorption capacity of Pb(II), Cd(II) and As(V) were observed to be 74.2, 41.3 and 5.0 mg/g respectively. Kinetic studies indicate that intra-particle diffusion plays a significant role in the removal of these three toxic pollutants. In addition, the composite beads were applied for the adsorption of a ternary mixture of subjected pollutants at low concentrations and found efficient to remove these pollutants up to an acceptable permissible limit of drinking water. The significances of this study propose the potential of composite beads for purifying the water containing toxic pollutants, viz., lead, cadmium, and arsenic.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Reasonable preparation of Fe-modified bentonite-activated carbon alginate beads </LI> <LI> Beads enhance the handling efficiency and applied as a multifunctional adsorbent </LI> <LI> Developed beads showed better sorption efficiency for single and mixed toxic ions </LI> <LI> Maximum sorption efficiency for Pb(II):74.2, Cd(II):41.3 and As(V):5.0 mg/g beads </LI> <LI> Molded adsorbent for trace level toxic ions removal from ternary mixture system. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
이청호,정진호,Radheshyam R. Pawar,김무늬,Lalhmunsiama,이승목 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
Natural sericite clay was modified with iron-oxide and then the modified sericite was encapsulated into beads by employing the ionic gelation method to obtain Fe-sericite composite beads. The materials were fully characterized by N2 adsorption–desorption isotherm, SEM-EDX, XRD, FT-IR and XPS analyses. Batch experiments showed that the composite beads showed a high uptake of As(V) and phosphate within a wide range of pH and the maximum sorption capacity determined by Langmuir isotherm were found to be 5.780 and 4.446 mg/g for As(V) and phosphate, respectively. The sorption kinetic data indicate that at least 12 h of contact time is necessary to attain the sorption equilibrium and intra-particle diffusion plays a significant role in the sorption process. The presence of background electrolyte (NaNO3) or other heavy metals ions could not significantly affect the uptake of As(V)/phosphate by Fe-sericite composite beads. Furthermore, a fixed-bed column experiment has demonstrated that Fe-sericite composite beads could remove As(V) and phosphate up to acceptable level with a high breakthrough volume even under dynamic conditions. XPS analysis results indicate the successful sorption of As(V)/phosphate and it is assumed that these two pollutants formed an inner sphere complexes with iron oxide present in the composite beads.
Lee, Cheongho,Jung, Jinho,Pawar, Radheshyam R.,Kim, Munui,Lalhmunsiama, Munui,Lee, Seung-Mok THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2017 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.47 No.-
<P><B>Abstract</B></P> <P>Natural sericite clay was modified with iron-oxide and then the modified sericite was encapsulated into beads by employing the ionic gelation method to obtain Fe-sericite composite beads. The materials were fully characterized by N<SUB>2</SUB> adsorption–desorption isotherm, SEM-EDX, XRD, FT-IR and XPS analyses. Batch experiments showed that the composite beads showed a high uptake of As(V) and phosphate within a wide range of pH and the maximum sorption capacity determined by Langmuir isotherm were found to be 5.780 and 4.446mg/g for As(V) and phosphate, respectively. The sorption kinetic data indicate that at least 12h of contact time is necessary to attain the sorption equilibrium and intra-particle diffusion plays a significant role in the sorption process. The presence of background electrolyte (NaNO<SUB>3</SUB>) or other heavy metals ions could not significantly affect the uptake of As(V)/phosphate by Fe-sericite composite beads. Furthermore, a fixed-bed column experiment has demonstrated that Fe-sericite composite beads could remove As(V) and phosphate up to acceptable level with a high breakthrough volume even under dynamic conditions. XPS analysis results indicate the successful sorption of As(V)/phosphate and it is assumed that these two pollutants formed an inner sphere complexes with iron oxide present in the composite beads.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fe-sericite was fabricated with alginate by ionic gelation method. </LI> <LI> Materials were characterized by N<SUB>2</SUB> adsorption–desorption isotherm, SEM-EDX, FT-IR, XRD and XPS analyses. </LI> <LI> Fe-sericite composite beads showed high selectivity toward As(V) and phosphate. </LI> <LI> Sorption mechanism is comprehensively discussed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Sawant, Sandesh Y.,Pawar, Radheshyam R.,Lee, Seung-Mok,Cho, Moo Hwan Elsevier 2017 JOURNAL OF CLEANER PRODUCTION Vol.168 No.-
<P><B>Abstract</B></P> <P>N-doped carbon cubes (NCCs) with varying nitrogen contents and different densities were fabricated using a simple and binder-free method that involved the curing of resorcinol-formaldehyde (RF) gel with different RF contents in the framework of a melamine sponge. In addition to the robust structure and nitrogen doping, the porosity of the NCCs could be tailored easily within the mesopores and ultra-micropores with a unique combination of macro, meso, and micropores. The prepared NCCs exhibited excellent uptake capacity, ranging from 32.1 to 39.3 mg/g Pb<SUP>2+</SUP> ions, owing to their high surface area (up to 675 m<SUP>2</SUP>/g) and nitrogen doping (max. 4.9 wt. %). The Pb<SUP>2+</SUP> adsorption property of NCC-10 was also compared with that of widely used commercial 3D carbon adsorbents. The weight and surface area-normalized Pb<SUP>2+</SUP> adsorption capacity of NCC-10 was found to be 3.7 and 6.6 times higher, respectively than the commercial activated carbon granules. The continuous mode model data fitted with experimental fixed-bed results well, and showed 8.95 mg/g loading capacity, proving that NCC-10 is an effective 3D adsorbent. The prepared NCCs could be used as a practical adsorbent for the removal of Pb<SUP>2+</SUP> ions because of their high adsorption capacity, easy regeneration, and exceptional stability maintained after longer reuse.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Binder-free method for the synthesis of 3D N-doped carbon cubes (NCCs) is reported. </LI> <LI> NCCs possess high porosity with unique combination of macro, meso, and micropores. </LI> <LI> N-doping and porosity can be tailored by varying resorcinol-formaldehyde content. </LI> <LI> NCCs showed higher Pb<SUP>2+</SUP> adsorption capacity than commercial 3D carbon adsorbents. </LI> <LI> A long-term and continuous Pb<SUP>2+</SUP> removal can be achieved with fixed bed adsorption. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>