Multifunctional ZnO nanorod-reduced graphene oxide hybrids nanocomposites for effective water remediation: Effective sunlight driven degradation of organic dyes and rapid heavy metal adsorption

Ranjith, Kugalur Shanmugam; Palanisamy, Masilamani; Rajendrakumar, Ramasamy Thangavel; Uyar, Tamer

doi:10.1016/j.cej.2017.05.105

Cited by 133 publications

(38 citation statements)

References 51 publications

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“…The bare ZnO exhibited a sharp emission peaks at 360 nm and 387 nm whereas broad emission at 550 nm. The peaks at 360 nm, 387 nm and 550 nm indicates the near band edge emission, electron-hole pair's recombination and defects (vacancies, interstitial and intrinsic) respectively 29,44 . As-prepared PbS exhibited narrow emission peak at 430 nm due the photo-generated electrons trapping by an interstitial www.nature.com/scientificreports www.nature.com/scientificreports/ Pb 2+ sites.…”

Section: Resultsmentioning

confidence: 99%

Microwave assisted synthesis of ZnO-PbS heterojuction for degradation of organic pollutants under visible light

Ganapathy

Harinee

Sridhar

et al. 2020

Sci Rep

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PbS heterojunction were prepared by microwave irradiation to improve the organic pollutants degradation under visible light irradiation. Hexagonal (wurtzite) and cubic crystal structure of ZnO and PbS respectively were confirmed by PXRD. Nano-plate, nano-sponge and nano-sponge imprinted over nano-sheet like morphology of ZnO, PbS and ZnO-PbS respectively were revealed through FESEM analysis. HR-TEM analysis provides the formation of heterojunction. XPS analysis shows the presence of the ZnO-PbS heterojunction. UV-Visible spectroscopy confirms the enhanced visible light response of Zno-pbS heterojunction than the bare Zno. the pL and eiS results indicate ZnO-PbS heterojunction exhibited lowest recombination of excitons and electron transfer resistance. Synergistic effect of ZnO-PbS heterojunction leads to efficient degradation against organic pollutants than bare ZnO and PbS. Aniline and formaldehyde were successfully degraded around 95% and 79% respectively, under solar light irradiation. As-prepared photocatalysts obeys pseudo first order reaction kinetics. HPLC analysis also confirms the successful mineralization of organic pollutants into water and co 2 .Lead sulfide (PbS) has broad spectral response form visible to near-IR region due to its narrow direct band gap (0.41 eV). In recent years, PbS sensitized nanomaterial's are increased the visible light response and photo-conversion efficiencies. It has unique photo physical properties such as multi exciton generation (MEG), high absorption coefficients, size dependent optical properties and optoelectronic properties 23,24 .Recently, several methods are adopted for the preparation of ZnO-PbS heterojunction such as chemical bath deposition 25 , ultrasound deposition method 26 , low temperature method 27 , successive Ionic Layer Adsorption and Desorption method 28,29 , Radio Frequency Sputtering 30 and spin coating method 31 . In all the above methods, most of them have some difficulties and limitations to produce ZnO-PbS heterojunction such as long reaction time and cost of the equipment. Therefore, novel techniques required to overcome this problem to prepare the semiconductor coupled ZnO-PbS photocatalyst in large-scale production without any sacrification in efficiency.Microwave irradiation technique is a best alternative heating source for the preparation of nano materials due to its rapid chemical reaction with short span of time when compared to conventional methods. Microwave irradiation involves through dipolar polarization and ionic conduction, which helps for the preparation of nanostructured materials 32 . Microwave method is fast, uniform heat distribution, energy efficient and simple than other conventional methods. The size and morphology of the material can be easily controlled by the microwave parameters such as frequency, time and operating power. Therefore, microwave method is leading technique for homogeneous nucleation and fast crystallization, which leads to the preparation of nano-structured inorganic semiconductor photocatalyst. In recent ...

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Section: Resultsmentioning

confidence: 99%

Microwave assisted synthesis of ZnO-PbS heterojuction for degradation of organic pollutants under visible light

Ganapathy

Harinee

Sridhar

et al. 2020

Sci Rep

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“…Metals such as cobalt (Co), copper (Cu), manganese (Mn), and zinc (Zn) are beneficial to live beings because they participate in vital processes in their bodies, but in high quantities, they become toxic and contaminate the environment . The presence of manganese in high concentrations in aquatic environments, usually from industrial processes such as mining and ore processing, causes inorganic pollution due to the fact that the metal is not biodegradable, presents toxicity and can accumulate in humans and animals, causing adverse reactions .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Mn(II) adsorption potential of SiO₂ obtained by different wet chemical methods

Gonçalves

Barbosa

Oliveira

et al. 2019

Int J Applied Ceramic Tech

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This paper describes the development of SiO 2 by 2 different wet chemical methods: polymeric precursor (PP) and sol-gel (SG). These samples were used as adsorbents of Mn(II) metal ions. Physicochemical characteristics of the 2 adsorbents were established, while zeta potential, Scanning Electron Microscopy, and Brunauer-Emmett-Teller (BET) surface area methods were further employed for characterization.Efficiencies of the prepared adsorbents in the adsorption of Mn(II) from aqueous solutions were investigated. The BET surface areas of the prepared adsorbent were 171 and 7 m 2 g −1 for SiO 2 PP and SiO 2 SG, respectively. Optimal adsorption occurred at pH 8.5, 5g L −1 of adsorbent concentration, and 90 minutes of contact time for both adsorbents. The Langmuir and Freundlich isotherms models fitted the experimental data of SiO 2 PP and SiO 2 SG, respectively, and SiO 2 PP showed the highest adsorption capacity due, probably, to its greater specific area. K E Y W O R D Sadsorption, manganese (II), polymeric precursors, silicon oxide, sol-gel

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“…The most recent trend in adsorbent material science are the so-called "low-cost" or "zero-cost" materials [13][14][15]. According to the literature, plenty of low-cost materials have already been tested in wastewater decontamination by adsorbing several pollutants, such as dyes [16][17][18][19], heavy metal ions [20][21][22][23][24][25], Equations (1) [43] and (2) [44], respectively (where I 002 (counts) was the intensity of the 002 crystalline peak at 22 • and I am (counts) was the height of the minimum between the 002 and 110 crystalline peaks):…”

Section: Introductionmentioning

confidence: 99%

Basic Dye Removal with Sorption onto Low-Cost Natural Textile Fibers

2018

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Over the last several years, the trend of researchers has been to use some very low-cost materials as adsorbents. For this purpose, some already commercially used bast fibers were selected as potential adsorbent materials to remove basic dye from synthetic effluents. The adsorption of basic yellow 37 dye was studied using three different bast fibers under the names of flax, ramie, and kenaf. Their morphological structure was examined using several techniques such as scanning electron microscopy (SEM), crystallinity, X-Ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), as well as those characterizations being a useful tool to propose a mechanism of the whole adsorption process. The adsorption evaluation was achieved by studying at first the pH (12) and temperature effects (25–55 °C). Two isotherm models (Langmuir and Freundlich) were also applied to the experimental equilibrium data revealing the superiority of ramie fibers (327, 435, and 460 mg·g−1 (25 °C) for kenaf, flax, and ramie, respectively). The crucial adsorbent’s dosage was found to be 0.1 g per litre for all fibers, while the completed desorption study (eluant’s pH and reuse cycles) also confirmed the strong potential of these kinds of fibers as adsorbents. The latter may be attributed to the cellulosic content.

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Multifunctional ZnO nanorod-reduced graphene oxide hybrids nanocomposites for effective water remediation: Effective sunlight driven degradation of organic dyes and rapid heavy metal adsorption

Cited by 133 publications

References 51 publications

Microwave assisted synthesis of ZnO-PbS heterojuction for degradation of organic pollutants under visible light

Microwave assisted synthesis of ZnO-PbS heterojuction for degradation of organic pollutants under visible light

Evaluation of the Mn(II) adsorption potential of SiO₂ obtained by different wet chemical methods

Basic Dye Removal with Sorption onto Low-Cost Natural Textile Fibers

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Multifunctional ZnO nanorod-reduced graphene oxide hybrids nanocomposites for effective water remediation: Effective sunlight driven degradation of organic dyes and rapid heavy metal adsorption

Cited by 133 publications

References 51 publications

Microwave assisted synthesis of ZnO-PbS heterojuction for degradation of organic pollutants under visible light

Microwave assisted synthesis of ZnO-PbS heterojuction for degradation of organic pollutants under visible light

Evaluation of the Mn(II) adsorption potential of SiO2 obtained by different wet chemical methods

Basic Dye Removal with Sorption onto Low-Cost Natural Textile Fibers

Contact Info

Product

Resources

About

Evaluation of the Mn(II) adsorption potential of SiO₂ obtained by different wet chemical methods