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RISS 인기검색어
- 검색키워드
- 저자 : Neetu Talreja (검색결과 3 건)
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Talreja, Neetu,Jung, SungHoon,Yen, Le Thi Hai,Kim, TaeYoung Elsevier 2020 Chemical engineering journal Vol.379 No.-
<P><B>Abstract</B></P> <P>Carbon-based materials with a controlled pore size distribution are highly desirable to achieve fast diffusion of electrolytes and enhance supercapacitor performance. Here, we report a method to effectively control porosity of the phenol formaldehyde (PF) resin-based carbons along with pore volume and pore size distribution using a combined metal templating and physical/chemical activation approach. The combined metal templating and physical/chemical activation approach allows the precise control of the pore size of the carbons. PF resin synthesized by suspension polymerization was used as a carbon source and metal ions (Fe<SUP>+</SUP> and Zn<SUP>+</SUP>) were used as templating agents. The pore size could be superbly tuned in the 2–50 nm range by varying the metal ion. Carbonization and CO<SUB>2</SUB> activation of the metal-embedded PF resins yielded carbon microparticles (M-CMP), which turned into carbon microparticles (M-CMP-S) having mesopores in the range of 35–51 nm by sonication and KOH activation. The specific capacitances of Fe-CMP-S and Zn-CMP-S were as high as 132 and 152 F g<SUP>−1</SUP> (58 and 74 F cm<SUP>−3</SUP>) in ionic liquid electrolyte with energy densities of 56 and 64 Wh kg<SUP>−1</SUP>, respectively. In organic electrolyte, the Zn-CMP-S showed the specific capacitance of 136 F g<SUP>−1</SUP> with a maximum power density of 709 kW kg<SUP>−1</SUP>. Adjustable pore size of the M-CMP-S facilitated the diffusion of electrolyte ions into the electrode, thereby achieving supercapacitor with high energy and power density.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Porous carbons with a controlled porosity and large pore volume were developed. </LI> <LI> Control over porosity was enabled by combined metal templating and activation. </LI> <LI> The resulting carbons were used as electrodes for supercapacitors. </LI> <LI> The supercapacitors showed both high energy density and power density. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Mohammad Ashfaq,Neetu Talreja,Divya Chauhan,C.A. Rodríguez,Adriana C. Mera,Mangalaraja Ramalinga Viswanathan 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-
Gallic acid (GA) is a polyphenols compound commonly present in wastewater that immensely affectsaquatic and human life. GA is also responsible for the inhibitory effects on the microbial activity in thesoil, thereby decreasing the fertility of the soil. Therefore, the removal of GA from the wastewater is necessaryto combat such issues. The present study focused on the synthesis of reduced graphene oxide (r-GO) incorporated bimetallic (Cu/Bi) based nanorods (r-GO-Cu/Bi-NRs) and their photocatalytic applications. Incorporating GO within the CuBi2O4-NRs might decrease the bandgap value, thereby increasingthe interfacial charge transfer. Moreover, GO increased the reactive sites and oxygen defects onto ther-GO-Cu/Bi-NRs that led to the separation rate of the photo-induced charge carriers and migration,thereby enhancing the photodegradation ability of the synthesized r-GO-Cu/Bi-NRs. The synthesis processof the r-GO-Cu/Bi-NRs is facile, novel, and economically viable for the photocatalytic degradationof organic pollutants.
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Dinesh Kumar,Neetu Talreja 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.1
Nickel nanoparticle (NiNPs)-doped carbon nanofiber (CNF) grafted with Rhodamine-B (RhB) dye (Ni- CNF-RhB), was prepared and utilized as a colorimetric probe for detection and measurements of chromium (Cr3+) and lead (Pb2+) metal ions in aqueous systems. An intense pink solution was obtained within 30 s on the exposure of the colorless Ni-CNF-RhB probe to the metal ions (Cr3+ and Pb2+) solution. Briefly, the NiNPs-doped carbon beads were synthesized and applied as a substrate to grow CNFs by chemical vapor deposition. The Ni-CNF-RhB colorimetric probe exhibited fast response and selective determination towards Cr3+ and Pb2+ over the 0.1-10 ppm concentration range of their respective solution pH. The developed probe also showed the pH-dependent colorimetric response, thereby, selectivity determination of the metal ions. The detection limits of the colorimetric probe against Cr3+ and Pb2+ are 203 and 132 nM, respectively. The binding ability of the RhB-dye was augmented by CNF and NiNPs, while the carbon beads provided support to CNF to help probe in detection application and its re-usability. The method to prepare the colorimetric probe is simple, novel, selective, and the probe can be efficiently used for the fast detection (naked eye) and measurements of toxic metal ions in aqueous systems.
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