Preparation of Ag@AgCl modified Bi4Ti3O12 and its visible light catalytic performance
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摘要: 以五水硝酸铋为铋源、钛酸四丁酯为钛源，通过水热法制备了Bi4Ti3O12，再以硝酸银为银源、盐酸为氯源，采用光照还原Bi4Ti3O12得到Ag@AgCl/Bi4Ti3O12复合材料。利用XRD、UV-Vis DRS、SEM、TEM、BET和XPS等方法对所制备材料的组成和结构进行表征和分析，并以甲基橙(MO)溶液的脱色率为评价标准，考察了所制备材料的可见光催化性能和活性物质。结果表明：制备的Bi4Ti3O12呈堆积花球状纳米片结构，Ag@AgCl颗粒沉积在Bi4Ti3O12片间，比表面积增大到14.30 m2/g，对可见光的吸收增强。当催化剂用量为0.5 g/L、在300 W氙灯照射80 mL 10 mg/L MO溶液30 min时，Ag@AgCl/Bi4Ti3O12的脱色率为96.71%，较Bi4Ti3O12提高38.28%，降解实验循环稳定性强，超氧自由基(•O2−)在降解过程中起决定性作用。Abstract: The Bi4Ti3O12was prepared by hydrothermal method using bismuth nitrate as the bismuth source and tetrabutyl titanate as the titanium source, and then the Bi4Ti3O12 was reduced by light to obtain Ag@AgCl/Bi4Ti3O12 nanocomposites using silver nitrate as the silver source and hydrochloric acid as the chlorine source. The compo-sition and structure of the as-prepared nanocomposites were characterized by XRD, UV-Vis DRS, SEM, TEM, BET and XPS, etc. Taking the decolorization rate of methyl orange (MO) as an evaluation standard, the visible light catalytic performance and active substances of the as-prepared catalyst were investigated. The results show that the prepared Bi4Ti3O12 has a stacked curd-shaped nanosheets structure and Ag@AgCl particles deposite between the sheets, the specific surface area of Ag@AgCl/Bi4Ti3O12 increases to 14.30 m2/g, and the absorption of visible light is enhanced. The decolorization rate can attain 96.71% when the 80 mL 10 mg/L MO solutions were irradiated under the 300 W xenon lamp for 30 min using 0.5 g/L Ag@AgCl/Bi4Ti3O12, which is 38.28% higher than that of pure Bi4Ti3O12. The degradation experiment has strong cycle stability and superoxide radicals (•O2−) plays a decisive role in the degradation process.
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Key words:
- visible light catalysis /
- bismuth titanate /
- silver /
- silver chloride /
- modification /
- degradation
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图 1 Bi4Ti3O12和Ag@AgCl/Bi4Ti3O12的XRD图谱
Figure 1. XRD spectra of Bi4Ti3O12 and Ag@AgCl/Bi4Ti3O12
图 2 Bi4Ti3O12和Ag@AgCl/Bi4Ti3O12的紫外可见漫反射光图谱 (a) 和Kubelka-Munk公式 (b)
Figure 2. UV-Vis diffuse reflectance spectra of Bi4Ti3O12 and Ag@AgCl/Bi4Ti3O12 (a) and Kubelka-Munk formula (b)
Eg—Energy gap; α—Absorptivity; h—Planck constant; v—Frequency
图 3 Ag@AgCl/Bi4Ti3O12的SEM图像 ((a)、(b)) 和EDS能谱 (c)
Figure 3. SEM images ((a), (b)) and EDS spectrum (c) of Ag@AgCl/Bi4Ti3O12
图 4 Ag@AgCl/Bi4Ti3O12的TEM图像 (a) 和HRTEM图像 (b)
Figure 4. TEM image (a) and HRTEM image (b) of Ag@AgCl/Bi4Ti3O12
图 5 Bi4Ti3O12和Ag@AgCl/Bi4Ti3O12的N2吸附-脱附等温线
Figure 5. N2 adsorption-desorption isotherm of Bi4Ti3O12 and Ag@AgCl/Bi4Ti3O12
STP—In standard state; $p $—N2 partial pressure; $p_0 $—At the temperature of liquid nitrogen, the saturated vapor pressure of N2
图 7 Bi4Ti3O12和Ag@AgCl/Bi4Ti3O12在甲基橙(MO)溶液降解效果 (a)、Ag@AgCl/Bi4Ti3O12对不同目标污染物降解效果 (b)
Figure 7. Degradation effect of Bi4Ti3O12 and Ag@AgCl/Bi4Ti3O12 in methyl orange (MO) solution (a) and degradation effect of Ag@AgCl/Bi4Ti3O12 on different target pollutants (b)
C0—Initial absorbance; Ct—Absorbance at light time t; TC—Tetracycline hydrochloride
图 8 Ag@AgCl/Bi4Ti3O12在MO溶液对自由基抑制剂光催化效果 (a)和Ag@AgCl/Bi4Ti3O12在MO溶液循环反应效果 (b)
Figure 8. Photocatalytic effect of Ag@AgCl/Bi4Ti3O12 on the free radical inhibitor in MO solution (a), and the cyclic reaction effect of Ag@AgCl/Bi4Ti3O12 in MO solution (b)
IPA—Isopropanol; BQ—Benzoquinone; ACS—Ammonium oxalate
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