Photocatalytic degradation of Rhodamine-B dye by stable ZnO nanostructures with different calcination temperature induced defects

Nandi, Prami; Das, Debajyoti

doi:10.1016/j.apsusc.2018.09.193

Cited by 141 publications

(72 citation statements)

References 72 publications

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“…In our synthesis process, NaOH provided OH − to react with Zn 2+ to form Zn(OH)4 2− , and CTAB contained ammonium to this reaction system. Due to the lone pair of electrons on the nitrogen atom, the empty orbitals of the metal particles can react with ammonium In our synthesis process, NaOH provided OH − to react with Zn 2+ to form Zn(OH) 4 2− , and CTAB contained ammonium to this reaction system. Due to the lone pair of electrons on the nitrogen atom, the empty orbitals of the metal particles can react with ammonium to form stable complexes.…”

Section: The Growth Mechanism Of Zno Nano-rod Arraysmentioning

confidence: 99%

“…When adding excess CTAB, {0001} facets are covered by the ammonium salt released by CTAB, which inhibits the growth of ZnO crystals in the length direction. Therefore, the Zn(OH) 4 2− growth primitives are more attached to other facets, which leads to anisotropic growth of ZnO crystals, where the lateral growth rate is much greater than the growth rate in the c-axis direction. The morphology of the ZnO crystal becomes a hexagonal flake structure, as shown in Figure 2g-h.…”

Section: The Growth Mechanism Of Zno Nano-rod Arraysmentioning

confidence: 99%

“…ZnO is a typical n-type semiconductor with a tremendous free exciton binding energy (~60 meV) and a direct band gap (~3.37 eV), which makes ZnO become an important nanomaterial [1][2][3][4]. It is known to us all that ZnO nanostructure possesses excellent optical and electrical properties, gas-sensitivity, good chemical stability, and low toxicity.…”

Section: Introductionmentioning

confidence: 99%

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ZnO Nano-Rod Arrays Synthesized with Exposed {0001} Facets and the Investigation of Photocatalytic Activity

et al. 2021

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Zinc oxide (ZnO) possesses superior chemical and physical properties so that it can occupy an essential position in the application of nanostructures. In this paper, ZnO nano-rod arrays were synthesized by a simple one-step hydrothermal approach with the assistance of cetyl trimethyl ammonium bromide (CTAB). Exposure of the {0001} facets could be controlled by adjusting the amount of CTAB and the maximum exposure of the {0001} facets of ZnO nanorods is obtained at 1.2 g of CTAB. The photocurrent, EIS, and PL measurements support the facile charge transfer with minimum recombination of the photogenerated excitons of the ZnO nano-rod arrays obtained at 1.2 g of CTAB. Consequently, the obtained ZnO nano-rod arrays at the optimal CTAB of 1.2 g exhibit an excellent photocatalytic degradation rate of 99.7% for rhodamine B (RhB), while the degradation rate of RhB by the ZnO obtained without CTAB is only 35%.

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Section: The Growth Mechanism Of Zno Nano-rod Arraysmentioning

confidence: 99%

Section: The Growth Mechanism Of Zno Nano-rod Arraysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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ZnO Nano-Rod Arrays Synthesized with Exposed {0001} Facets and the Investigation of Photocatalytic Activity

et al. 2021

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“…Defects could either favour or deteriorate the photocatalytic activity of the metal oxide, depending on their physical location in the system [18]. By these calcination conditions, the chitin would occupy a proper proportion of the defect position of the zinc oxide, which promotes the separation, restrains the recombination of electrons and holes (e − -h + ), increases the charge transport and accelerates the photocatalytic activity [19]. This may be due to 1) doping a certain proportion of non-metallic elements in ZnO lattice, namely chitin, could generate some corresponding improvements within the range of 1:2 to 2:3.…”

Section: Effect Of Calcination Temperaturementioning

confidence: 99%

Treatment of Aquaculture Wastewater through Chitin/ZnO Composite Photocatalyst

Lin

Yang

Huang

et al. 2019

Water

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This paper proposed a newly explored composite photocatalyst, Chitin/ZnO, prepared via the sol-gel method for exploring its photocatalytic activity in the simulated aquaculture wastewater under UV irradiation. The study mainly involves the application of Chitin/ZnO from three aspects: the structure, the principle and the degradation efficiency. The effects of purification operation factors including mass ratio rate, dosage, calcination temperature, initial NH4+–N concentration and illumination conditions on the NH4+–N removal effectiveness were investigated. Optimum conditions were explored through orthogonal experiments, which revealed that 88.73% NH4+–N removal from 60 mg/L synthetic wastewater was achieved by direct illumination for 120 min. Additionally, Chitin/ZnO photocatalysts (mass ratio of 2:3) at a calcination temperature of 500 °C were favorable for Chitin loaded over a ZnO lattice. The obtained nanoparticles of Chitin/ZnO were characterized using SEM and X-ray diffraction. The purpose of this paper is to grope for an economical and easy method of Chitin/ZnO powder preparation and to provide a practical approach for future research on the photocatalytic purification of aquaculture wastewater.

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“…三处显著的峰属于纤锌矿结构 ZnO [22] 。1352 (D 模) 和 1598 cm -1 (G 模)处两个明显的峰, 表明样品中存在石墨化碳 [23] , 而红外光谱图无法表征石墨化碳, 因此, 在 ZnO 纳米棒的红外光谱图中未发现明显的碳信号。图 4 ZnO 纳米棒的(a)热重曲线和(b)拉曼光谱 Fig. 4 (a 商品相比, ZnO 纳米棒的氧空位峰明显增强, 表明在 ZnO 纳米棒中存在更多的氧空位。电子顺磁共振测试(EPR)是确定物质是否存在晶格空位最有效的方法 [26] 。从样品的 EPR 图谱 (图 5(c))中, 发现 ZnO 商品在相关区域内没有信号, 这表明商业产品中不存在明显的晶格空位。ZnO 纳米棒在 g=1.959 处有信号, 表明体系中存在氧空位。同时在 g=2.002 处的弱信号表明体系中含有少量的锌空位 [27] 。氧空位的存在有利于活性材料中电子或离子的传输, 进而提升材料的导电性能 [15,28] 。同时, 少量的锌空位也在一定程度上提供了更多的电化学反应位点, 提升材料的倍率性能 [29] ZnO@Bi/C [12] 1 C-5C ~52.5…”

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Preparation of ZnO Nanorods with Lattice Vacancies and Their Application in Ni-Zn Battery

Zhu¹,

Wei²,

Jian-Hang³

et al. 2019

Journal of Inorganic Materials

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As a type of environmental benign secondary battery with high power density, Ni-Zn battery is often limited by the weakness of negative electrode materials in the applications. In this work, ZnO nanorods (NRs) with high performance were synthesized by Sol-Gel process with hexamethylenetetramine (HMT) as template and subsequent thermal annealing treatment. Morphology, crystalline structure and surface functional groups of ZnO NRs were characterized by transmission electron microscope (TEM), X-ray powder diffraction (XRD) and Fourier-transform infrared spectroscope (FT-IR), respectively. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) measurements reveal that ZnO NRs have carbon layers on the surface and vacancies in the lattice. Tafel tests and electrochemical impedance spectroscopy (EIS) show that the corrosion current and charge transfer resistance of ZnO NRs-based electrodes are reduced by 40% and 62%, respectively, compared with commercial ZnO. Further investigation show that Ni-Zn batteries fabricated with ZnO NRs have better cycling performances. After 100 cycles at a current density of 1 A•g-1 , the capacity retention rate of ZnO NRs is 92%, which is significantly higher than that of commercial ZnO powder (32%).

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Photocatalytic degradation of Rhodamine-B dye by stable ZnO nanostructures with different calcination temperature induced defects

Cited by 141 publications

References 72 publications

ZnO Nano-Rod Arrays Synthesized with Exposed {0001} Facets and the Investigation of Photocatalytic Activity

ZnO Nano-Rod Arrays Synthesized with Exposed {0001} Facets and the Investigation of Photocatalytic Activity

Treatment of Aquaculture Wastewater through Chitin/ZnO Composite Photocatalyst

Preparation of ZnO Nanorods with Lattice Vacancies and Their Application in Ni-Zn Battery

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