Study of MoS2@ZIF-67 nanocomposite for dye adsorption application

Abstract

High speed industrialization has given way to immense environmental pollution, consequently caused harm to not only human health but also to the whole ecosystem. The non-biodegradable waste including dyes and heavy metal ions comprises mutagenic and carcinogenic properties. So, to safe the inherent beauty of the earth, there is a serious need to effectively remove these toxic and insoluble pollutants from water because of arising water deficiency. Among the other reported methods used for water purification, adsorption is the most efficient and economical one. Still, its necessary to invent efficient adsorbent materials with large surface area and significant chemical functionality to favorably adsorb the pollutants. The here and now, work illustrates one of the latest species as adsorbent material, which is the nanocomposite of molybdenum disulfide (MoS2) with ZIF-67 (Zeolitic Imidazolate framework-67). The features of 2D (two-dimensional) MoS2 structures, such as quantum confinement, high absorption coefficient, high surface-to-volume ratio, and tunable band gap, make them an encouraging contestant in various fields such as electronics, energy storage, catalysis and adsorption etc. Metal Organic Frameworks (MOFs) emerged as an advanced group of materials, which attained consideration as efficient adsorbents across the previous two decades, owing to their facile synthesis, large surface area and adjustable pore size. MOFs are reported as capable contestants for dye’s removal from wastewater. In this work, to explore the adsorption capacity of 2D MoS2 with ZIF-67 for methyl orange (MO), different nanocomposites are synthesized by in-situ room temperature method having different weight percentages of 2D MoS2. Hence, 5%MoS2@ZIF-67 nanocomposite proved to be the best among the other nanocomposites for MO adsorption from wastewater, exhibiting the adsorption efficiency of 85%. The crystal structure, elemental mapping, functional group detection, and morphology of the synthesized samples were investigated by using XRD, EDX, FTIR, and SEM respectively. The effect of various temperatures and pH on adsorption process also studied. The experimental data examined by the kinetic models including pseudo-first-order kinetic model and pseudo-second-order kinetic model. The adsorption isotherms of MO on iv

High speed industrialization has given way to immense environmental pollution, consequently caused harm to not only human health but also to the whole ecosystem. The non-biodegradable waste including dyes and heavy metal ions comprises mutagenic and carcinogenic properties. So, to safe the inherent beauty of the earth, there is a serious need to effectively remove these toxic and insoluble pollutants from water because of arising water deficiency. Among the other reported methods used for water purification, adsorption is the most efficient and economical one. Still, its necessary to invent efficient adsorbent materials with large surface area and significant chemical functionality to favorably adsorb the pollutants. The here and now, work illustrates one of the latest species as adsorbent material, which is the nanocomposite of molybdenum disulfide (MoS2) with ZIF-67 (Zeolitic Imidazolate framework-67). The features of 2D (two-dimensional) MoS2 structures, such as quantum confinement, high absorption coefficient, high surface-to-volume ratio, and tunable band gap, make them an encouraging contestant in various fields such as electronics, energy storage, catalysis and adsorption etc. Metal Organic Frameworks (MOFs) emerged as an advanced group of materials, which attained consideration as efficient adsorbents across the previous two decades, owing to their facile synthesis, large surface area and adjustable pore size. MOFs are reported as capable contestants for dye’s removal from wastewater. In this work, to explore the adsorption capacity of 2D MoS2 with ZIF-67 for methyl orange (MO), different nanocomposites are synthesized by in-situ room temperature method having different weight percentages of 2D MoS2. Hence, 5%MoS2@ZIF-67 nanocomposite proved to be the best among the other nanocomposites for MO adsorption from wastewater, exhibiting the adsorption efficiency of 85%. The crystal structure, elemental mapping, functional group detection, and morphology of the synthesized samples were investigated by using XRD, EDX, FTIR, and SEM respectively. The effect of various temperatures and pH on adsorption process also studied. The experimental data examined by the kinetic models including pseudo-first-order kinetic model and pseudo-second-order kinetic model. The adsorption isotherms of MO on iv