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- 저자 : MADHUSUDHANA RAO. D (검색결과 5 건)
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Kotte, Madhusudhana Rao,Kuvarega, Alex T.,Cho, Manki,Mamba, Bhekie B.,Diallo, Mamadou. S. American Chemical Society 2015 Environmental science & technology Vol.49 No.16
<P>Advances in industrial ecology, desalination, and resource recovery have established that industrial wastewater, seawater, and brines are important and largely untapped sources of critical metals and elements. A <I>Grand Challenge</I> in metal recovery from industrial wastewater is to design and synthesize high capacity, recyclable and robust chelating ligands with tunable metal ion selectivity that can be efficiently processed into low-energy separation materials and modules. In our efforts to develop high capacity chelating membranes for metal recovery from impaired water, we report a one-pot method for the preparation of a new family of mixed matrix polyvinylidene fluoride (PVDF) membranes with in situ synthesized poly(amidoamine) [PAMAM] particles. The key feature of our new membrane preparation method is the in situ synthesis of PAMAM dendrimer-like particles in the dope solutions prior to membrane casting using low-generation dendrimers (G0 and G1-NH<SUB>2</SUB>) with terminal primary amine groups as precursors and epichlorohydrin (ECH) as cross-linker. By using a combined thermally induced phase separation (TIPS) and nonsolvent induced phase separation (NIPS) casting process, we successfully prepared a new family of asymmetric PVDF ultrafiltration membranes with (i) neutral and hydrophilic surface layers of average pore diameters of 22–45 nm, (ii) high loadings (∼48 wt %) of dendrimer-like PAMAM particles with average diameters of ∼1.3–2.4 μm, and (iii) matrices with sponge-like microstructures characteristics of membranes with strong mechanical integrity. Preliminary experiments show that these new mixed matrix PVDF membranes can serve as high capacity sorbents for Cu(II) recovery from aqueous solutions by ultrafiltration.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2015/esthag.2015.49.issue-16/acs.est.5b01594/production/images/medium/es-2015-01594n_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/es5b01594'>ACS Electronic Supporting Info</A></P>
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Mining Critical Metals and Elements from Seawater: Opportunities and Challenges
Diallo, Mamadou S.,Kotte, Madhusudhana Rao,Cho, Manki American Chemical Society 2015 Environmental science & technology Vol.49 No.16
<P>The availability and sustainable supply of technology metals and valuable elements is critical to the global economy. There is a growing realization that the development and deployment of the clean energy technologies and sustainable products and manufacturing industries of the 21st century will require large amounts of critical metals and valuable elements including rare-earth elements (REEs), platinum group metals (PGMs), lithium, copper, cobalt, silver, and gold. Advances in industrial ecology, water purification, and resource recovery have established that seawater is an important and largely untapped source of technology metals and valuable elements. This feature article discusses the opportunities and challenges of mining critical metals and elements from seawater. We highlight recent advances and provide an outlook of the future of metal mining and resource recovery from seawater.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2015/esthag.2015.49.issue-16/acs.est.5b00463/production/images/medium/es-2015-004638_0008.gif'> <P>The availability and sustainable supply of technology metals and valuable elements is critical to the global economy. There is a growing realization that the development and deployment of the clean energy technologies and sustainable products and manufacturing industries of the 21st century will require large amounts of critical metals and valuable elements including rare-earth elements (REEs), platinum group metals (PGMs), lithium, copper, cobalt, silver, and gold. Advances in industrial ecology, water purification, and resource recovery have established that seawater is an important and largely untapped source of technology metals and valuable elements. This feature article discusses the opportunities and challenges of mining critical metals and elements from seawater. We highlight recent advances and provide an outlook of the future of metal mining and resource recovery from seawater.</P></P>
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Girish M. Joshi,S.M. Khatake,S. Kaleemulla,N. Madhusudhana Rao,Teresa Cuberes 한국물리학회 2011 Current Applied Physics Vol.11 No.6
Composite films of Polyvinyl alcohol (PVA) mixed with Lead Titante Oxide (PbTiO_3) were prepared. Dopant incorporated and DC bias induced electrical parameters were disclosed with respect to pure PVA film. The results demonstrate dielectric polarization is not only directly proportional to PbTiO_3% of dopant but also external DC bias potential at 30 ℃ based on Maxwell Wagner theory. Hence these properties highly applicable as super-capacitor film and humidity sensor applications.
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LEFT FILTERS AND PRIME IDEALS ON TERNARYSEMIGROUPS
JAYA LALITHA. G,SARALA. Y,SRINIVASA KUMAR. B,MADHUSUDHANA RAO. D 장전수학회 2017 Proceedings of the Jangjeon mathematical society Vol.20 No.2
In this article, we give the characterization of a left lter of ternary semigroups. We analyze some relations between the left ternary lters and prime right ideals of a ternary semigroup.
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