Developing the Ternary ZnO Doped MoS2 Nanostructures Grafted on CNT and Reduced Graphene Oxide (RGO) for Photocatalytic Degradation of Aniline

Abstract

Transition metal sulfide semiconductors have achieved significant attention in the field of photocatalysis and degradation of pollutants. MoS 2 with a two dimensional (2D) layered structure, a narrow bandgap and the ability of getting excited while being exposed to visible light, has demonstrated great potential in visible-light-driven photocatalysts. However, it possesses fast-paced recombination of charges. in this study, the coupled MoS 2 nanosheets were synthesized with Zno nanorods to develop the heterojunctions photocatalyst in order to obtain superior photoactivity. the charge transfer in this composite is not adequate to achieve desirable activity. therefore, heterojunction was modified by reduced graphene oxide (RGO) nanosheets and carbon nanotubes (cnts) to develop the RGo/Zno/MoS 2 and cnts/Zno/MoS 2 ternary nanocomposites. the structure, morphology, composition, optical and photocatalytic properties of the as-fabricated samples were characterized through X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), Field Emission Scanning electron Microscopy (feSeM), transmission electron Microscopy (teM), energy-Dispersive X-ray (eDX), elemental mapping, photoluminescence (pL), Ultraviolet-Visible spectroscopy (UV-ViS), and Brunauer-emmett-teller (Bet) techniques. the photo-catalytic performance of all samples was evaluated through photodegradation of aniline in aqueous solution. the combination of RGo or cnts into the Zno/MoS 2 greatly promoted the catalytic activity. However, the resulting RGo/Zno/MoS 2 ternary nanocomposites showed appreciably increased catalytic performance, faster than that of cnts/Zno/MoS 2. charge carrier transfer studies, the Bet surface area analysis, and the optical studies confirmed this superiority. The role of operational variables namely, solution pH, catalyst dosage amount, and initial concentration of aniline was then investigated for obtaining maximum degradation. complete degradation was observed, in the case of pH = 4, catalyst dosage of 0.7 g/L and aniline concentration of 80 ppm, and light intensity of 100 W. According to the results of trapping experiments, hydroxyl radical was found to be the main active species in the photocatalytic reaction. Meanwhile, a plausible mechanism was proposed for describing the degradation of aniline upon ternary composite. Moreover, the catalyst showed excellent reusability and stability after five consecutive cycles due to the synergistic effect between its components. Total-Organic-Carbon concentration (TOC) results suggested that complete mineralization of aniline occurred after 210 min of irradiation. Finally, a real petrochemical wastewater sample was evaluated for testing the catalytic ability of the as-fabricated composites in real case studies and it was observed that the process successfully quenched 100% and 93% of Chemical Oxygen Demand (COD) and TOC in the wastewater, respectively.

Polyurethane film prepared from ball-milled algal polyol particle and activated carbon filler for NH3–N removal

“…It is corroborated by the surface area and pore size of the respective materials, as can be seen in Table 3 . The addition of filler increased the surface area and provided higher quantity of pores, as reported previously [ 23 ].

Figure 5 a) effect of contact time of AlgPU, AC/AlgPU1, and AC/AlgPU2; b) comparison of 0.035 g activated carbon (AC), AlgPU, AC/AlgPU1, and AC/AlgPU2 adsorbents; c) effect of pH; and d).

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“…Activated carbon was selected because it was made of biomass, which was the focus of this research in optimizing the biomass-based adsorbent. Previous studies had reported that carbonaceous fillers can modify the material's hydrophilicity, morphology, surface charge, and surface area that of beneficial for pollutant uptake [ 23 , 24 , 25 ]. There are other options such as carbon nanotube and graphene oxide, but to obtain the structure, more complex preparation and chemicals are required [ 26 , 27 ].…”

Surfactin production in the bioreactor: Emphasis on magnetic nanoparticles application

“…Kinetic studies have shown that the production of surfactin is dependent on bacterial growth [1]. Today, extensive research is conducted on the use nanoparticles such as iron, gold, silver, and iron oxide for increasing the amount of production and improving the effects of biosurfactants [9–11]. It is reported that some nanoparticles at certain concentrations not only do not have antimicrobial effects but also increase the level of bacterial contact with compounds present in the medium and enhance the exchange of nutrients and thereby increase the rate of biosurfactant production.…”

Ectoine production in bioreactor by Halomonas elongataDSM2581: Using MWCNT and Fe‐nanoparticle

“…39 Some others studied effect of nanostructures on biological process as well. 40,41 3.4 | SEM analysis T A B L E 7 Investigating the gas holding, kLa and diameter of the bubbles in different aeration rates. In aeration rate of 0.17 vvm, the highest gas hold up and k L a were observed (SD = ±0.1) appropriate mixing time was 40 s. The gas hold up was measured equivalent to the ratio of the volume extension to initial volume by a high speed camera and the data was analyzed using Photoshop software.…”