CdS quantum dots confined in mesoporous TiO2with exceptional photocatalytic performance for degradation of organic polutants.
In this paper, the mesoporous TiO2with different concentration of CdS quantum dots (i.e., x% CdS/TiO2) was successfully fabricated by the sol-gel method. The composition, structure and morphology of the nanocomposites were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), UV-vis diffuse reflectance spectroscopy (UV-Vis/DRS) and nitrogen physical adsorption test and so on. The proportion of CdS and TiO2is very important for the photocatalytic performance. As a result, the photocatalytic degradation performance from the most to the least is in the order of 2% CdS/TiO2, 4% CdS/TiO2, 8% CdS/TiO2, pure TiO2and 1% CdS/TiO2. The photocatalytic (PC) activity of the 2% CdSTiO2is characterized by photocatalytic degradation of methyl orange, which can be completely degraded within 45 min better than 60 min TiO2takes. It is also much better than CdS. Moreover, other four organic pollutants, such as methylthionine chloride, bisphenol A, rhodamine B, malachite green can also be degraded quickly on the condition of 2% CdS/TiO2. What's more, the chemical stability and cycling capability of 2% CdS/TiO2are reflected by five cyclic degradation of methyl orange.
College of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, PR China.
Panpan
P
Zhou
College of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, PR China. Electronic address: xieyu_121@163.com.
Yu
Y
Xie
College of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, PR China.
Jing
J
Fang
College of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, PR China.
Yun
Y
Ling
School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China. Electronic address: yuchanglinjx@163.com.
Changling
C
Yu
College of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, PR China.
Xiaoming
X
Liu
College of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, PR China.
Yuhua
Y
Dai
College of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, PR China.
Yuancheng
Y
Qin
College of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, PR China.
Dan
D
Zhou
D019187:Cadmium Compounds / Q000737:chemistry*; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry; D004785:Environmental Pollutants / Q000032:analysis* / Q000737:chemistry; D052918:Environmental Restoration and Remediation / Q000379:methods*; D053761:Nanocomposites / Q000032:analysis* / Q000737:chemistry; D009930:Organic Chemicals / Q000032:analysis / Q000737:chemistry; D045663:Quantum Dots / Q000737:chemistry*; D059027:Recycling; D013440:Sulfides / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
D019187:Cadmium Compounds; D004396:Coloring Agents; D004785:Environmental Pollutants; D009930:Organic Chemicals; D013440:Sulfides; C034939:cadmium sulfide; C009495:titanium dioxide; D014025:Titanium
Degradation; Mesoporous CdS/TiO(2) nanocomposite; Organic polutants; Photocatalytic activity