Fast synthesis of CuS and Cu9S5 microcrystal using subcritical and supercritical methanol and their application in photocatalytic degradation of dye in water

Li, Shuangming; Zhang, Zhe; Yan, Lin; Jiang, Shengnan; Zhu, Ning; Li, Jian; Li, Wenxiu; Yu, Sansan

doi:10.1016/j.supflu.2016.12.014

Cited by 52 publications

(20 citation statements)

References 65 publications

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“…The increase in absorption at higher wavelengths may be ascribed to free-carrier intra-band absorbance (Zhao et al, 2009). The direct band gap for the three samples were 1.85, 2.03, and 1.72 eV for the Cu 9 S 5 samples obtained at 240, 260, and 280°C respectively, which are in agreement with values previously reported in literature (Senthilkumar and Babu, 2016;Li et al, 2017;Itzhak et al, 2018). This difference in band gaps for the samples could be attributed to difference in size, stoichiometric variation and the arrangement of the cations and anions in the atomic structure of the compounds.…”

Section: Optical Propertiessupporting

confidence: 90%

“…They are excellent p-type semiconductors, a consequence of the copper vacancies in the crystal lattice, and exhibit a stoichiometry dependent bandgap range of 1.2-2.0 eV (Han et al, 2016). Some of the identified stoichiometries with their band gap energies include chalcocite (Cu 2 S), 1.2 eV; digentite (Cu 1.8 S or Cu 9 S 5 ), 1.55 eV; djurleite (Cu 1.95 S), 1.3 eV; anilite (Cu 1.75 S or Cu 7 S 4 ), 1.70 eV; and covellite (CuS), 2.0 eV (Abdelhady et al, 2011;Li et al, 2017). Cu 9 S 5 crystallizes in the hexagonal digentite phase and has been explored in a variety of technologies such as solar cells and in sodium-ion batteries (Jing et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Temperature Controlled Evolution of Pure Phase Cu9S5 Nanoparticles by Solvothermal Process

Olatunde

Onwudiwe

2021

Front. Mater.

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Copper sulphides are one of the most explored semiconductor metal sulphides because of their stoichiometric and morphological dependent optical and electrical properties, which makes them tunable for numerous optoelectronic applications. Stoichiometrically, copper sulphides exist in numerous structures which varies from the copper-rich phase (Cu2S) to the copper-deficient phase (CuS). Within these extreme stoichiometric phases lies numerous non-stoichiometric phases with interesting optical properties. Different solvothermal techniques have been explored for the synthesis of copper sulphides; however, the thermal decomposition of single source precursors provides a facile and tunable route to the synthesis of pure phase copper sulphides of different stoichiometries. In this study, copper (II) dithiocarbamate have been explored as a single source precursor compound to study the evolution of pure phase Cu9S5. Below 240°C, mixed phase of CuS and Cu9S5 were obtained, and as the temperature was increased beyond 240°C, keeping other reaction condition unchanged, the precursor yielded pure phase of Cu9S5. This phase selectivity at high temperature was attributed to the increased reducing ability of oleylamine (used as solvent) which enhance the evolution of the copper rich phase at high temperature. Optical and morphological studies of the pure phase Cu9S5, showed properties that varied considerably with the temperature of synthesis.

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Section: Optical Propertiessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Temperature Controlled Evolution of Pure Phase Cu9S5 Nanoparticles by Solvothermal Process

Olatunde

Onwudiwe

2021

Front. Mater.

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“…In Figure a, the main high-resolution Cu 2p spectrum of Cu 9 S 5 displays two major peaks at 932.5 and 952.3 eV that correspond to the Cu 2p 3/2 and Cu 2p 1/2 in the Cu 9 S 5 , respectively. Further deconvolution illustrates the presence of two peaks centered at 934.4 and 953.8 eV from Cu 2+ and two additional peaks near 935.7 and 955.4 eV probably from CuSO 4 . Also, two satellite peaks at 942.7 and 962.7 eV belong to the paramagnetic state of Cu 2+ .…”

Section: Resultsmentioning

confidence: 88%

“…Further deconvolution illustrates the presence of two peaks centered at 934.4 and 953.8 eV from Cu 2+ 53 and two additional peaks near 935.7 and 955.4 eV probably from CuSO 4 . 54 Also, two satellite peaks at 942.7 and 962.7 eV belong to the paramagnetic state of Cu 2+ . 55 The S 2p core-level XPS (Figure 5b) breaks down into two peaks around 161.7 and 162.9 eV originating from S 2p 3/2 and 2p 1/2 in Cu 9 S 5 .…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Phase-Dependent Photocatalytic Activity of Bulk and Exfoliated Defect-Controlled Flakes of Layered Copper Sulfides under Simulated Solar Light

Telkhozhayeva

Konar

Lavi

et al. 2021

ACS Sustainable Chem. Eng.

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Sunlight-driven photocatalysis is an environmentally friendly approach to solve ecological issues. The development of simple yet sufficiently stable photocatalytic materials capable of responding to the full-spectrum light remains challenging. Here, we demonstrate the phase transformations of bulk copper sulfides from digenite (Cu 9 S 5 ) to djurleite (Cu 1.97 S) and low chalcocite (Cu 2 S) by the reactive thermal annealing during ambient pressure chemical vapor deposition, followed by their top-down exfoliation. Using multiple techniques, we confirm that monoclinic Cu 2 S is primarily formed at higher temperatures or greater reaction times and using a reducing atmosphere. We measured the average thickness to be approximately 4 nm for the exfoliated flakes with relatively large lateral sizes of up to 10 μm. We tested the three phases of bulk copper sulfides and their exfoliated forms as photocatalysts for dye degradation under simulated solar light irradiation. Exfoliated Cu 2 S flakes exhibited superior photocatalytic activity (0.007 min −1 ), roughly twice higher than that of bulk chalcocite, which could be predominantly attributed to their 2D structure and also 2D planar defects, which could serve as active centers for dye photodegradation. Our study paves the way for developing nextgeneration full-spectrum-responsive 2D copper sulfide photocatalysts for environmental decontamination.

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“…Among metal sulfides, copper sulfides with different morphologies, and bandgap values are recognized as important semiconducting materials with potential applications in many fields such as solar cells (Isac et al, 2011; Yan et al, 2013), photocatalysis (Cao et al, 2015; Srinivas et al, 2015; Ayodhya et al, 2016; Li et al, 2017; Wu et al, 2017), lithium-ion rechargeable batteries (Yang et al, 2018), supercapacitors (Krishnamoorthy et al, 2014), electrochemical biosensing (Liu et al, 2014), photothermal conversion (Fang et al, 2018; Rokade et al, 2018), and as materials exhibiting localized surface plasmon resonance (LSPR) absorption (Jia et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Copper Sulfide Based Heterojunctions as Photocatalysts for Dyes Photodegradation

et al. 2019

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The presence of toxic, non-biodegradable and harmful organic pollutants in soils, wastewater, and atmosphere has become an indisputable, and global fact as a significant environmental problem. The heterogeneous photocatalysis, an advanced oxidation process (AOP) using semiconductor materials as catalysts, is a topic of great interest considering the possibility of the pollutants removal from water. The photocatalytic degradation of organic contaminants (i.e., dyes, pesticides, phenolic compounds) present in water using semiconductor materials depends on a number of parameters such as: the bandgap energy, phase composition, crystallinity, morphology and surface area of catalyst, electron-hole recombination rate, intensity of light, and adsorption capacity of the dye on the photocatalyst surface. One of the important constraints related to the catalyst photocatalytic efficiency is the fast recombination of the photogenerated electrons and holes. Therefore, various strategies have been involved in promoting the charge separation, including the development of heterojunction between two semiconductor materials, by tailoring the photocatalysts properties. This mini-review deals with the recent developments on dyes photodegradation using as catalysts various heterojunctions based on copper sulfide nanostructures, such as copper sulfide/metal oxide, copper sulfide/metal sulfide, copper sulfide/graphene, copper sulfide/organic semiconductors etc. The effects of different parameters, such as synthesis parameters, particle size, bandgap energy, surface area, and morphology on the photocatalytic activity of copper sulfide heterojunctions for dyes degradation is also highlighted.

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Fast synthesis of CuS and Cu9S5 microcrystal using subcritical and supercritical methanol and their application in photocatalytic degradation of dye in water

Cited by 52 publications

References 65 publications

Temperature Controlled Evolution of Pure Phase Cu9S5 Nanoparticles by Solvothermal Process

Temperature Controlled Evolution of Pure Phase Cu9S5 Nanoparticles by Solvothermal Process

Phase-Dependent Photocatalytic Activity of Bulk and Exfoliated Defect-Controlled Flakes of Layered Copper Sulfides under Simulated Solar Light

Copper Sulfide Based Heterojunctions as Photocatalysts for Dyes Photodegradation

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