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Vu, H.C.,Dwivedi, A.D.,Le, T.T.,Seo, S.H.,Kim, E.J.,Chang, Y.S. Elsevier 2017 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.307 No.-
Graphene oxide has been utilized effectively for the adsorption of heavy metals. Incorporation of graphene oxide with magnetite nanoparticles through co-precipitation enhances separation of a newly designed magnetite graphene oxide by a magnetic field. Considering the instability of magnetite graphene oxide under different water chemistry conditions, we designed encapsulated magnetite graphene oxide inside a non-toxic alginate bead as a high-performance green chemical for the uptake of Cr(VI) and As(V) in water treatment applications (mGO/bead). The alginate, itself revealed low contribution for metal ions uptake, however this could potentially inhibit the aggregation of magnetite graphene oxide powder showing enhanced performance to extract metals from water. Material capacity minimally altered over a range of pH values for As(V), while Cr(VI) uptake varied with pH changes, which were explained by a local pH-controlled mechanism. Induced hydrolysis was facilitated by the release of Fe<SUP>3+</SUP> from Fe<SUP>3+</SUP>-crosslinked mGO/beads, thus enhancing the removal of Cr(VI). For a complex mixture of heavy metals, influence of the presence of co-occurring ions in a mixed contaminant system (Cr(VI), As(V), Cu(II), Cd(II)) revealed an excellent performance (~80-100% removal) by the composite material. The mGO/bead maintained its activity in wastewater and exhibited greater adsorption efficiency for both Cr(VI) and As(V) compared with activated carbon and carbon nanotube. The mGO/beads could be collected and reused for at least 5 cycles without the leaching of core mineral contents. The results indicate the advantages of mGO/beads over the popular adsorbents that can be developed as a versatile material for water treatment.
A proposed organic Schottky barrier photodetector for application in the visible region
A.D.D. Dwivedi,Arun Kumar Singh,Rajiv Prakash,P. Chakrabarti 한국물리학회 2010 Current Applied Physics Vol.10 No.3
The fabrication and characterization of an organic photodetector (OPD) in the form of ITO coated glass/polycarbazole (PCz)/Al Schottky contact is reported. The device has been fabricated in our laboratory for the first time using the polymer synthesized by us. The device has been subsequently characterized in respect of electrical and optical properties in order to explore its potential for possible use as a detector in the visible region at 650 nm. It is observed that the detector exhibits a reasonably high value of peak detectivity (~6 × 106 cm Hz1/2W-1) near zero bias voltage at V = 0.2 V.
Sachin Singh,A. K. Sharma,Pooja Lohia,D. K. Dwivedi 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.3
In this study, an angular interrogation technique has been used for modeling a highly sensitive surface plasmon resonance (SPR)based biosensor. The large surface area of the heterostructure of the blue phosphorene (BP/MoS 2 ) layer facilitates the biomolecules absorption. A four-layer Kretschmann model of the SPR biosensor containing the BP/MoS 2 heterostructure with a gold layer is proposed. Compared to the traditional gold fi lmbased SPR biosensors, the sensitivity of the proposed SPR biosensor has been signifi cantly improved. An enhanced sensitivity 224.57°/RIU has been achieved by optimizing the proposed structure with 50 nm thick gold layer and a monolayer of heterostructure BP/MoS 2 with a thickness of 0.75 nm. Moreover, the proposed BP/MoS 2 heterostructure off ers extremely small FWHM, high detection accuracy, and highquality factor parameters. The highest sensitivity of 252°/RIU was found with two-layers of BP/MoS 2 heterostructure confi guration. It is observed that, compared to previously reported sensitivity, the proposed SPR biosensor shows better results.
Raspberry derived mesoporous carbon-tubules and fixed-bed adsorption of pharmaceutical drugs
Dubey, S.P.,Dwivedi, A.D.,Lee, C.,Kwon, Y.N.,Sillanpaa, M.,Ma, L.Q. Korean Society of Industrial and Engineering Chemi 2014 Journal of industrial and engineering chemistry Vol.20 No.3
Novel mesoporous carbon-tubules were prepared from wild plant leaves of Rubus idaeus (Raspberry) and their physicochemical characteristics were analyzed by spectroscopic and potentiometric titration methods. The developed carbon-tubules were applied for the aqueous phase decontamination of three pharmaceutical drugs. Ibuprofen, naproxen and clofibric acid were selected for the study. Batch and fixed-bed studies were performed to investigate the adsorption of selected pharmaceutical drugs. Mathematical modelings were applied to the experimental data in order to estimate the maximum adsorption capacity and evaluate the characteristics of the fixed-bed. Based on finding, the adsorption mechanism was investigated by adsorbate and adsorbent physicochemical characteristics.
Dubey, S.P.,Dwivedi, A.D.,Lahtinen, M.,Lee, C.,Kwon, Y.N.,Sillanpaa, M. Pergamon 2013 Spectrochimica acta. Part A, Molecular and biomole Vol.103 No.-
This article is aimed to extend a simple protocol for preparation of various plant leaves extract and their application to green synthesis of the metallic nanoparticles. Five plant leaves extract showed mild reduction and stabilization ability for silver and gold nanoparticles (AgNPs and AuNPs) at room temperature. The particle size range varied from 25 to 42nm and 21 to 47nm for AgNPs and AuNPs, respectively. Plant leaves extract-mediated nanoparticles were characterized to confirm the shape, size, crystallinity, and content using different spectroscopic investigations. Differences in stability of nanoparticles at different pH were also measured by zeta potential.