Enhanced Photocatalytic Activity of the Carbon Quantum Dot-Modified BiOI Microsphere

Chen, Yuan; Lu, Qiuju; Yan, Xuelian; Mo, Qionghua; Chen, Yun; Liu, Bitao; Teng, Liumei; Xiao, Wei; Ge, Liangsheng; Wang, Qinyi

doi:10.1186/s11671-016-1262-7

Cited by 42 publications

(19 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While Chen et al used this approach, to predict the type of active chemical species responsible of photocatalytic activity of carbon quantum dots modified BiOI microsphere [78]. The small band gap of 1.8 eV makes BiOI easily to excite by visible light, however, the more positive edge of the BiOI conduction band (0.6 V vs. NHE) suppress the production of a superoxide radical.…”

Section: Resultsmentioning

confidence: 99%

Band edge positions as a key parameter to a systematic design of heterogeneous photocatalyst

Abdullah

2019

Eur J Chem

View full text Add to dashboard Cite

Although, plenty of photocatalytic approaches have been developed in the past few decades to overcome major drawbacks, such as; wide band gap and fast volume/surface recombination of the charge carriers, the researchers still need to carry out careful systematic studies before conducting experiments based on physicochemical properties of a system. Thus, in this review, a detailed discussion of the band edge positions controlling the migration and charge separation of the produced charged carriers and its impact onto the photocatalytic systems are provided. The knowledge of band edge positions is a crucial prerequisite to a rational design of an efficient photocatalytic system. The enhancement mechanism should match these criteria to be reliable in the field of heterogeneous photocatalysis science.

show abstract

Section: Resultsmentioning

confidence: 99%

Band edge positions as a key parameter to a systematic design of heterogeneous photocatalyst

Abdullah

2019

Eur J Chem

View full text Add to dashboard Cite

show abstract

“…The photocurrent is relatively stable, although some variation could be due to recombination of electron/hole pairs in the N-CQDs. 46 It is informative to compare the magnitude of the photocurrent under OCV control vs. under applied potential control. In the former case (the reader is again referred to Figure 5 for this discussion), illumination induces a very small, very brief photocurrent (on the order of several nA).…”

Section: Resultsmentioning

confidence: 99%

Electrochemical UV Sensor Using Carbon Quantum Dot/Graphene Semiconductor

Wang

Myers

2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

Our group has developed an electrochemical UV sensor utilizing carbon quantum dots as the photoactive material functionalizing a graphene semiconductor layer. When used as a photoactive electrode in contact with a solid polymer electrolyte in a photoelectrochemical cell, illumination under UV radiation at 365 nm induces a photocurrent with a corresponding change in device voltage. The time-dependent change in voltage is a function of UV radiation intensity. Varying the UV LED power density from 26.6 mW/cm 2 (approximately 100% intensity) to 5.1 mW/cm 2 (approximately 20% intensity) results in time-dependent potential changes (dU/dt) ranging from approximately 4.0 mV/s to 0.5 mV/s. The dU/dt vs. LED power density trend is nearly linear (r 2 = 0.97). Similarly, when a constant bias potential is applied to the cell, a sustained photocurrent is observed under UV illumination, with the magnitude of the photocurrent a linear function of the LED power density. In that case, the coefficient of determination r 2 = 0.98. These results indicate that a graphene semiconductor, when functionalized with a photoactive material like carbon quantum dots, has application as a UV sensor with the ability to quantify the intensity of UV radiation. Nano-scale carbon-based materials, such as carbon quantum dots (CQDs), have received significant attention recently due to their unique optical and electronic properties.1 Depending on the particular synthesis procedure and the carbon source, carbon quantum dots can be environmentally and biologically benign.2 It is interesting to note that practically any carbon-containing material can be used as the source for carbon quantum dots. Literature reports on a host of starting materials exist. For example, Meiling and co-workers have used starch and tris-acetate-EDTA buffer as carbon sources.3 Du and co-workers prepared carbon quantum dots from orange pericarp in a hydrothermal treatment method. 4 Zhou, et al., used watermelon peel as a carbon source.5 Often, carbon quantum dots are simply obtained from more typical laboratory chemicals like citric acid. [6][7][8] There are also many possible CQD synthesis techniques, including hydrothermal methods, 9,10 electrochemical methods 11 and microwave-assisted methods.12,13 The combination of widely-variable carbon sources and facile synthesis procedures has ensured that CQD research continues to grow. It is likely that organic CQDs will make up a large share of the growing nanomaterial market. In fact, CQDs have been suggested as markers for biosensing and bioimaging, It is generally accepted that size and surface properties determine CQD optical and electronic behavior. Modification of the surface properties could be achieved by doping the CQDs, often with nitrogen. 24,25 For example, it has been demonstrated that N-doping of CQDs increases quantum yield and electron transfer.26 These N-doped CQDs (henceforth referred to as N-CQDs in this paper) possess unique properties like electrocatalytic activity, controllable luminescence and are also biologic...

show abstract

“…The instruments were similar to our previously work [13]. The X-ray diffraction (XRD) patterns were recorded by a Danton TD-3500 X-ray diffractometer (Cu-Ka radiation, λ = 1.54 Å).…”

Section: Methodsmentioning

confidence: 99%

“…As reported in our previously work [13], the photocatalytic activities were evaluated under visible light irradiation using a Xe lamp light source with a 420-nm UV cutoff filter. In a typical process, 100 mg of photocatalyst was dispersed in 100-ml methylene blue (MB) and methyl orange (MO) aqueous solution (50 mg L −1 ), respectively.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Fe and N Co-doped Bi2Ti2O7 Nanofiber with Enhanced Photocatalytic Activity Under Visible Light Irradiation

Liu

Zhu

et al. 2016

Nanoscale Res Lett

Self Cite

View full text Add to dashboard Cite

A series of N-Fe-Bi2Ti2O7 nanofibers were successfully synthesized. The structure, morphology, visible light photocatalytic properties, and the degradation mechanism of N-Fe-Bi2Ti2O7 were investigated. A new phase of Bi4Ti3O7 and smaller band gap could be observed after doing Fe and N into Bi2Ti2O7. It can degrade 66 % MO and 87 % MB in 120 min under visible light irradiation, which is much more than that of pure Bi2Ti2O7. The results indicate that such unique structure could enhance the charge transfer between the nanostructure interfaces and therefore improve its photocatalytic activities.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1610-7) contains supplementary material, which is available to authorized users.

show abstract

Enhanced Photocatalytic Activity of the Carbon Quantum Dot-Modified BiOI Microsphere

Cited by 42 publications

References 23 publications

Band edge positions as a key parameter to a systematic design of heterogeneous photocatalyst

Band edge positions as a key parameter to a systematic design of heterogeneous photocatalyst

Electrochemical UV Sensor Using Carbon Quantum Dot/Graphene Semiconductor

Synthesis of Fe and N Co-doped Bi2Ti2O7 Nanofiber with Enhanced Photocatalytic Activity Under Visible Light Irradiation

Contact Info

Product

Resources

About