Rational design of hyperbranched 3D heteroarrays of SrS/CdS: synthesis, characterization and evaluation of photocatalytic properties for efficient hydrogen generation and organic dye degradation

Khan, Ziyauddin; Chetia, Tridip Ranjan; Qureshi, Mohammad

doi:10.1039/c2nr30666b

Cited by 38 publications

(17 citation statements)

References 27 publications

(32 reference statements)

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“…Moreover, self-degradation of RhB under illumination conditions was almost negligible. Figure 7a presents a photodegradation kinetic plot of RhB as a function of the illumination time, which was fitted to pseudo-first-order kinetics according to the literature 24 . As shown in Figure 7a , P-TiO 2 showed negligible activity due to the wide band gap and high recombination rate of the photogenerated electrons and holes.…”

Section: Resultsmentioning

confidence: 99%

Highly Visible Light Responsive, Narrow Band gap TiO2 Nanoparticles Modified by Elemental Red Phosphorus for Photocatalysis and Photoelectrochemical Applications

Ansari

2016

Sci Rep

241

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This paper reports that the introduction of elemental red phosphorus (RP) into TiO 2 can shift the light absorption ability from the UV to the visible region, and confirmed that the optimal RP loading and milling time can effectively improve the visible light driven-photocatalytic activity of TiO 2 . The resulting RP-TiO 2 nanohybrids were characterized systematically by a range of techniques and the photocatalytic ability of the RP-TiO 2 photocatalysts was assessed further by the photodegradation of a model Rhodamine B pollutant under visible light irradiation. The results suggest that the RP-TiO 2 has superior photodegradation ability for model contaminant decomposition compared to other wellknown photocatalysts, such as TiO 2 and other reference materials. Furthermore, as a photoelectrode, electrochemical impedance spectroscopy, differential pulse voltammetry, and linear scan voltammetry were also performed in the dark and under visible light irradiation. These photoelectrochemical performances of RP-TiO 2 under visible light irradiation revealed more efficient photoexcited electron-hole separation and rapid charge transfer than under the dark condition, and thus improved photocatalytic activity. These findings show that the use of earth abundant and inexpensive red phosphorus instead of expensive plasmonic metals for inducing visible light responsive characteristics in TiO 2 is an effective strategy for the efficient energy conversion of visible light.The design of a photocatalyst for the utilization of solar energy is considered one of the most promising and clean approaches towards pollutant removal from aquatic environments. Metal oxide-mediated photocatalysis under UV light and/or visible light have been reported widely in terms of stability, efficiency and metal free photocatalysts 1-4 . Among them, TiO 2 is a more popular photocatalyst for the conversion of solar energy, hydrogen generation via water splitting reaction and dye degradation because of its stability, high catalytic activity, low cost, easy availability etc. 3,4 . On the other hand, the catalytic efficiency of TiO 2 in the wider spectrum of solar energy is still low because of its wide band gap and high recombination rate of photoinduced electrons and holes. Several attempts have been made to enhance the photocatalytic activity and extend the absorption edge of TiO 2 to the visible region via metal and non-metal doping, anchoring of noble metals, textural designing and surface defect engineering [2][3][4][5] . On the other hand, the catalytic efficiency and absorption ability of TiO 2 over the wide spectrum of solar energy is still feeble and unsatisfactory.Recently, elemental semiconductors, such as α -sulphur 6 and red phosphorus (RP), have attracted considerable attention in the field of photocatalysis because of their unique advantages, such as wide visible light absorption ability, low cost, and earth abundance, which make it suitable for a range of practical applications 6,7 . Among them, RP has been reported to be a promising candid...

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Section: Resultsmentioning

confidence: 99%

Highly Visible Light Responsive, Narrow Band gap TiO2 Nanoparticles Modified by Elemental Red Phosphorus for Photocatalysis and Photoelectrochemical Applications

Ansari

2016

Sci Rep

241

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“…In particular, the 2-RPh-g-C 3 N 4 heterostructures photocatalysts showed the highest photocatalytic ability for the degradation of MO and RhB under visible photoirradiation. For a better understanding of the photocatalytic activity of each photocatalyst, the apparent rate constant (k) was obtained using the methodology reported elsewhere 42 44 . Figures 4a,b , and S6 presents a ln(C 0 /C) kinetic plot of the organic pollutant as a function of the photoirradiation time.…”

Section: Resultsmentioning

confidence: 99%

Facile and Scale Up Synthesis of Red Phosphorus-Graphitic Carbon Nitride Heterostructures for Energy and Environment Applications

Ansari

Cho

2016

Sci Rep

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The development of heterostructured materials for efficient solar energy conversion and energy storage devices are essential for practical applications. In this study, a simple and relatively inexpensive method was used to improve the visible light-driven photocatalytic activity and electrochemical supercapacitor behavior of the graphitic carbon nitride (g-C3N4) by elemental red phosphorus (RPh). The as-prepared RPh-g-C3N4 was characterized in detail using a range of spectroscopic techniques to understand the structure, morphology, chemical interaction, and chemical state of the materials. The visible light-driven photocatalytic activity and supercapacitive electrode performance were assessed by the photodegradation of model colored, non-colored organic pollutants, and electrochemical half-cell measurements, respectively. The RPh-g-C3N4 heterostructure with 30 weight percent of RPh exhibited remarkably high photocatalytic activity for the degradation of pollutants compared to the bare constituent materials, which was further confirmed by the photoelectrochemical study under similar visible photoirradiation conditions. The RPh-g-C3N4 heterostructure supercapacitor electrode displayed a high capacitance of 465 F/g and excellent cyclic stability with capacitance retention of 90% after 1000 cycles at a current of 10 A/g. The superior performance was attributed mainly to the narrow band gap, high surface area, capacitive nature of RPh, and nitrogen-rich skeleton of g-C3N4.

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“…), [6,7] metal sulfides (CdS, ZnS or CuS 2 , etc. ), [8] and noble metals (Au, Ag and Pt, etc. ), [9] have been employed.…”

Section: Introductionmentioning

confidence: 99%

Novel polyoxometalate@g-C3N4 hybrid photocatalysts for degradation of dyes and phenolics

Sun

Indrawirawan

et al. 2015

Journal of Colloid and Interface Science

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Rational design of hyperbranched 3D heteroarrays of SrS/CdS: synthesis, characterization and evaluation of photocatalytic properties for efficient hydrogen generation and organic dye degradation

Cited by 38 publications

References 27 publications

Highly Visible Light Responsive, Narrow Band gap TiO2 Nanoparticles Modified by Elemental Red Phosphorus for Photocatalysis and Photoelectrochemical Applications

Highly Visible Light Responsive, Narrow Band gap TiO2 Nanoparticles Modified by Elemental Red Phosphorus for Photocatalysis and Photoelectrochemical Applications

Facile and Scale Up Synthesis of Red Phosphorus-Graphitic Carbon Nitride Heterostructures for Energy and Environment Applications

Novel polyoxometalate@g-C3N4 hybrid photocatalysts for degradation of dyes and phenolics

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