Yazar "Singh, Archana" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim Yok
    Öğe
    Recent advances in manipulating strategies of NH2-functionalized metallic organic frameworks-based heterojunction photocatalysts for the sustainable mitigation of various pollutants
    (Academic Press Inc Elsevier Science, 2024) Kaur, Balvinder; Soni, Vatika; Kumar, Rohit; Singh, Pardeep; Selvasembian, Rangabhashiyam; Singh, Archana; Thakur, Sourbh
    NH2-functionalized metal-organic frameworks (NH2-functionalized MOFs) can abate organic pollutants, predominantly favored by their chemical, mechanical, and thermal stabilities. The present review stated the chemistry of identifying NH2-functionalization and its role in enhancing the properties of bare MOFs. The integration of the amine group bestows several advantages: 1.) enabling band structure modification, 2.) establishing strong metal-NH2 bonds, 3.) preserving MOF structures from reactive oxygen species, and 4.) shielding MOF structures against pH alterations. Consequently, the NH2-functionalized MOFs are promising materials for the photodegradation of organic contaminants. The following section illustrates the two approaches (pre-synthetic and post-synthetic) for NH2-functionalized MOFs. Nevertheless, specific intrinsic limitations, entailing a high recombination rate of charge carriers and inadequate optical adsorption, restrain the applicability of NH2-functionalized MOFs. Accordingly, the succeeding segment presents strategies to elevate the photocatalytic activities of NH2-functionalized MOFs via heterojunction fabrication. The importance of the NH2- functionalized MOFs-based heterojunction has been evaluated in terms of the effect on the enhancement of charge separation, optical adsorption, and redox ability of charge carriers. Subsequently, the potential application for organic pollutant degradation via NH2-functionalized MOFs-based heterojunctions has been scrutinized, wherein the organic pollutants. Eventually, the review concluded with challenges and potential opportunities in engaging and burgeoning domains of the NH2-functionalized MOFs-based heterojunctions.
  • Küçük Resim Yok
    Öğe
    Unveiling cutting-edge developments in defective BiOI nanomaterials: Precise manipulation and improved functionalities towards bolstered photocatalysis
    (Elsevier, 2025) Soni, Vatika; Malhotra, Monika; Singh, Archana; Khan, Aftab Aslam Parwaz; Kaya, Savas; Katin, Konstantin; Le, Quyet Van
    Defect engineering represents a paradigm shift in tailoring nanomaterials for enhanced catalytic performance across various applications. This manuscript succinctly highlights the significance of defect engineering in improving the catalytic performance of BiOI nanoparticles for multiple applications, particularly in photocatalysis. The photocatalytic process of BiOI semiconductor is intricately linked to its indirect bandgap and layered crystalline structure. By influencing the structural dynamics of its layered materials, defects contribute significantly to optimizing its catalytic performance. Fundamental insights into manipulating defects, including oxygen and iodine vacancies, bismuth defects, and synergistic dual defects, in BiOI are meticulously discussed. Advanced characterization techniques, spanning spectroscopy to microscopy, are explored for precise defect identification and quantification. The fragile van der Waals forces foster interactions between adjacent iodine atoms in BiOI, contributing to the overall structural stability. Understanding these structural intricacies lays a robust foundation for comprehending and exploring the exceptional physicochemical properties of twodimensional BiOI. The manuscript showcases BiOI potential in energy and environmental sectors, ranging from solar-driven H2 evolution to CO2 reduction and various harmful pollutant degradation. By unravelling the intricate interplay between defects and catalytic activity, this manuscript sets a new benchmark for tailored catalytic solutions. This manuscript offers a comprehensive overview of defect engineering in BiOI and charts a path towards sustainable and efficient photocatalytic systems. It underscores the imperative of meticulous defect control and innovation in addressing the pressing challenges of the energy and environmental landscape.
  • Küçük Resim Yok
    Öğe
    Unveiling new horizons of progress on manipulating the structure and characterization of phosphate-modified polymer for selective uranium adsorption
    (Elsevier Science Sa, 2024) Kaur, Balvinder; Rana, Parul; Singh, Pardeep; Singh, Archana; Chaudhary, Vishal; Kaya, Savas; Van Le, Quyet
    The hazardous effect of Uranium (U(VI)) on the environment principally stems from its metallic and radioactive properties. Considering the toxicity and radioactivity of U(VI)), there is an imperative necessity to remove U(VI)) from wastewater through various adsorbents. This comprehensive review delves into the quest for employing phosphate-modified polymers for U(VI) uptake by adsorption. The review emphasizes the critical role of U(VI) specific binding to phosphate-modified polymers in increasing the affinity of polymers toward U(VI). The merging of phosphate-based polymers and interactions such as coordination bonding and complexation generated a precise speculation of the chemisorption exhaustion mechanism. The advertisements for interactions with the adsorbent are determined by parameters like pH, coexisting ions, ionic strength, temperature, and contact time, which gives information about the adsorption process. This review summarises the recent breakthroughs towards the classifications, synthesis, and adsorption mechanism of phosphate-modified polymers. In turn, the capacity of phosphate-modified polymers to adsorb contributes to the fact that the polymers are regeneratable after desorption. Overall, this clarifies the potential of phosphate modification to improve the adsorption capacity of polymer adsorbents.