Ganga Ram Chaudhary

Bio: Ganga Ram Chaudhary is an academic researcher from Panjab University, Chandigarh. The author has contributed to research in topics: Nanoparticle & Materials science. The author has an hindex of 23, co-authored 115 publications receiving 1588 citations.

Removal of water contaminants by iron oxide nanomaterials.

Abstract: In recent years, there has been increasing concern about the usage of a broad range of organic substances, heavy metals and aromatic compounds in the aquatic environment due to their wide distribution and potential adverse health effects. The presence of toxic contaminants in water effluent, even at very low concentrations, is extremely harmful and undesirable. Various treatment processes have been investigated to reduce these toxic pollutants from wastewater. Because of the chemical stability of the contaminants, these technologies have proved to be ineffective for handling waste effluents. Nanotechnology offers the possibility of efficient removal of pollutants as nanoparticles have a smaller size and higher adsorptive surface area. From the past few years, nanoscale iron oxides such as magnetite, maghemite, and hematite have been used for the separation and removal of organic and inorganic contaminants. In this review we summarize the use of iron oxide nanomaterials performed over the last few years for the removal of dyes, heavy metals and aromatic compounds.

Tungsten oxide (WO3) nanoparticles as scaffold for the fabrication of hydrazine chemical sensor

Abstract: This paper reports the fabrication and characterization of hydrazine amperometric sensor based on tungsten oxide (WO3) nanoparticles. The WO3 nanoparticles were prepared by facile aqueous solution process. The detailed morphological and structural characterizations revealed that the prepared nanoparticles are spherical shape and possessing well-crystalline monoclinic structure. The prepared nanoparticles were used as effective electron mediators for the fabrication of efficient hydrazine amperometric sensors. The fabricated hydrazine sensor exhibited a good sensitivity of 0.18,471 μA/μM/cm2 and detection limit of 144.73 μM. Importantly, to the best of our knowledge; this is the first report in which WO3 nanoparticles are efficiently used as effective electron mediator for the fabrication of sensitive hydrazine amperometric sensor.

Synthesis of CeO2–ZnO nanoellipsoids as potential scaffold for the efficient detection of 4-nitrophenol

Abstract: Well-crystalline CeO 2 –ZnO composite nanoellipsoids (NEs) were synthesized by facile hydrothermal process at low-temperature and characterized in detail in terms of their morphological, structural, optical and compositional properties. The detailed characterizations revealed that the synthesized CeO 2 –ZnO NEs are pure, grown in high density, possessing well-crystallinity and exhibiting good optical properties. Finally, the prepared NEs were used as efficient electron mediators for the fabrication of 4-nitrophenol chemical sensors. The fabricated sensor exhibited a reliable and reproducible sensitivity of ∼0.120 μA/nM cm 2 and detection limit of 1.163 μM. To the best of our knowledge this is the first report in which CeO 2 –ZnO NEs were used as efficient electron mediators for the fabrication of 4-nitrophenol chemical sensors. The presented work demonstrates that simply prepared nanocomposites can effectively be used for the fabrication of efficient, reliable and robust chemical sensors.

Compound Copper Chalcogenide Nanocrystals

Abstract: This review captures the synthesis, assembly, properties, and applications of copper chalcogenide NCs, which have achieved significant research interest in the last decade due to their compositional and structural versatility. The outstanding functional properties of these materials stems from the relationship between their band structure and defect concentration, including charge carrier concentration and electronic conductivity character, which consequently affects their optoelectronic, optical, and plasmonic properties. This, combined with several metastable crystal phases and stoichiometries and the low energy of formation of defects, makes the reproducible synthesis of these materials, with tunable parameters, remarkable. Further to this, the review captures the progress of the hierarchical assembly of these NCs, which bridges the link between their discrete and collective properties. Their ubiquitous application set has cross-cut energy conversion (photovoltaics, photocatalysis, thermoelectrics), en...

Nanomaterials for the Removal of Heavy Metals from Wastewater

Abstract: Removal of contaminants in wastewater, such as heavy metals, has become a severe problem in the world. Numerous technologies have been developed to deal with this problem. As an emerging technology, nanotechnology has been gaining increasing interest and many nanomaterials have been developed to remove heavy metals from polluted water, due to their excellent features resulting from the nanometer effect. In this work, novel nanomaterials, including carbon-based nanomaterials, zero-valent metal, metal-oxide based nanomaterials, and nanocomposites, and their applications for the removal of heavy metal ions from wastewater were systematically reviewed. Their efficiency, limitations, and advantages were compared and discussed. Furthermore, the promising perspective of nanomaterials in environmental applications was also discussed and potential directions for future work were suggested.