CN105797753A - A kind of MoS2/TiO2 two-dimensional composite nano photocatalyst and its preparation method and application - Google Patents
A kind of MoS2/TiO2 two-dimensional composite nano photocatalyst and its preparation method and application Download PDFInfo
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Abstract
Description
技术领域technical field
本发明属于光催化领域，具体涉及一种MoS2/TiO2二维复合纳米光催化剂及其制备方法和应用。The invention belongs to the field of photocatalysis, and in particular relates to a MoS 2 /TiO 2 two-dimensional composite nano photocatalyst and its preparation method and application.
背景技术Background technique
光催化是指利用半导体吸收太阳能并将其转化成化学能的特性来降解有机物，这种方式效率高且不会造成二次污染，是环境治理的新方向，而光催化技术的关键是合适的催化剂的选择与制备。过渡金属氧化物TiO2具有无毒无害、催化效率高、稳定性好、成本低廉等优点，是一种较为理想的光催化剂材料，具有巨大的应用前景。Photocatalysis refers to the use of semiconductors to absorb solar energy and convert it into chemical energy to degrade organic matter. This method is efficient and does not cause secondary pollution. It is a new direction for environmental governance, and the key to photocatalytic technology is suitable Catalyst selection and preparation. Transition metal oxide TiO 2 has the advantages of non-toxic and harmless, high catalytic efficiency, good stability, and low cost. It is an ideal photocatalyst material and has great application prospects.
TiO2有锐钛矿和金红石两个稳定的晶相，一般用于光催化的是活性更高的锐钛矿相。锐钛矿不同的晶面表面能差异很大，常见的几个晶面的表面能依次是：{101}：0.43J/m2，{010}：0.57J/m2，{001}：0.95J/m2，{111}：1.61J/m2。{001}等晶面具有很高的晶面能，也相应地具有很高的催化活性，但普通方法得到的TiO2大量暴露的晶面是低能的{101}面，高能的{001}面暴露比例很小。TiO 2 has two stable crystal phases, anatase and rutile, and the anatase phase with higher activity is generally used for photocatalysis. The surface energy of different crystal faces of anatase varies greatly. The surface energies of several common crystal faces are: {101}: 0.43J/m 2 , {010}: 0.57J/m 2 , {001}: 0.95 J/m 2 , {111}: 1.61 J/m 2 . {001} and other crystal planes have high crystal plane energy and correspondingly high catalytic activity. However, the exposed crystal planes of TiO 2 obtained by ordinary methods are low-energy {101} planes and high-energy {001} planes. Exposure is small.
在晶体生长过程中，表面能高、化学活性大的晶面的生长速度更快，从而导致在生成的晶体中所占比例较低。也就是说，在普通方法制备的晶体中，暴露在外面的晶面绝大多数都是表面能最低、活性最小的晶面。对于锐钛矿相TiO2来说，普通情况下暴露在外面的晶面主要是表面能最低的{101}面(>94％)，而不是表面能更高、催化活性更好的{001}面。因此，如果能够提高高能晶面暴露在外面的比例，则能大大提高TiO2的光催化性能。目前{001}晶面暴露的TiO2已经被成功制备出来。During the crystal growth process, crystal planes with high surface energy and high chemical activity grow faster, resulting in a lower proportion of the resulting crystals. That is to say, in crystals prepared by common methods, most of the exposed crystal planes are the crystal planes with the lowest surface energy and the least activity. For anatase TiO 2 , the exposed crystal planes are mainly {101} planes with the lowest surface energy (>94%), rather than the {001} planes with higher surface energy and better catalytic activity. noodle. Therefore, if the proportion of exposed high-energy crystal faces can be increased, the photocatalytic performance of TiO2 can be greatly improved. At present, TiO 2 with exposed {001} facets has been successfully prepared.
但另一方面，TiO2的量子分离效率比较低，而二维材料MoS2是一种理想的复合基体，将{001}面暴露的TiO2纳米片和二维材料MoS2复合制备二维复合光催化剂有望大幅提高其性能。But on the other hand, the quantum separation efficiency of TiO 2 is relatively low, and the two-dimensional material MoS 2 is an ideal composite matrix. The TiO 2 nanosheets exposed on the {001} plane and the two-dimensional material MoS 2 are combined to prepare a two-dimensional composite Photocatalysts are expected to substantially improve their performance.
综合上述讨论，可以看出，二维复合光催化剂的制备依旧是个问题，特别是到目前为止，还未见文献报道能够实现二维复合光催化剂制备的技术和方法。Based on the above discussion, it can be seen that the preparation of two-dimensional composite photocatalysts is still a problem, especially so far, there has been no technology and method for the preparation of two-dimensional composite photocatalysts reported in the literature.
发明内容Contents of the invention
本发明的目的在于克服现有技术的不足，提供一种MoS2/TiO2二维复合纳米光催化剂及其制备方法和应用。本发明以钛酸四丁酯(C16H36O4Ti)、氢氟酸(HF)、钼酸钠(Na2MoO4)和硫脲(CH4N2S)为前驱体，用二次水热法制备出MoS2/TiO2二维复合纳米光催化剂。本发明制备的二维复合纳米光催化剂的优势在于：(1)具有很高的光催化活性；(2)颗粒尺寸小，具有很大的比表面积(110m2/g)。因此，该二维复合纳米光催化剂在光催化环境治理方面具有很好的应用前景。The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a MoS 2 /TiO 2 two-dimensional composite nano photocatalyst and its preparation method and application. The present invention uses tetrabutyl titanate (C 16 H 36 O 4 Ti), hydrofluoric acid (HF), sodium molybdate (Na 2 MoO 4 ) and thiourea (CH 4 N 2 S) as precursors, and uses two MoS 2 /TiO 2 two-dimensional composite nanophotocatalyst was prepared by subhydrothermal method. The advantages of the two-dimensional composite nano photocatalyst prepared by the invention are: (1) high photocatalytic activity; (2) small particle size and large specific surface area (110m 2 /g). Therefore, the two-dimensional composite nanophotocatalyst has a good application prospect in photocatalytic environmental treatment.
本发明为解决上述技术问题所提供的技术方案具体如下：The technical scheme provided by the present invention for solving the above-mentioned technical problems is specifically as follows:
一种MoS2/TiO2二维复合纳米光催化剂，具有壳型纯锐钛矿相结构，其内核为TiO2纳米片，外壳为MoS2，比表面积为110m2/g。A MoS 2 /TiO 2 two-dimensional composite nano photocatalyst has a shell-type pure anatase phase structure, the inner core is TiO 2 nanosheet, the outer shell is MoS 2 , and the specific surface area is 110m 2 /g.
一种制备MoS2/TiO2二维复合纳米光催化剂的方法，包括以下步骤：将钛酸四丁酯和HF进行水热反应，制备出{001}面暴露的TiO2纳米颗粒；然后将{001}面暴露的TiO2纳米颗粒与钼酸钠和硫脲一起进行水热反应，其中，钼酸钠和硫脲的质量比为1:2；将固体产物烘干，研磨成粉末，得到MoS2/TiO2二维复合纳米光催化剂。A method for preparing MoS 2 /TiO 2 two-dimensional composite nano-photocatalyst, comprising the following steps: hydrothermally reacting tetrabutyl titanate and HF to prepare TiO 2 nanoparticles with exposed {001} faces; 001} exposed TiO nanoparticles were hydrothermally reacted with sodium molybdate and thiourea, wherein the mass ratio of sodium molybdate and thiourea was 1:2; the solid product was dried and ground into powder to obtain MoS 2 /TiO 2 two-dimensional composite nanophotocatalyst.
具体包括以下步骤：Specifically include the following steps:
(1)将钛酸四丁酯和HF按体积比10：(1～4)混合均匀，置于水热反应釜中进行恒温水热反应，水热反应的温度为150～200℃，水热反应的时间为15～30小时；(1) Mix tetrabutyl titanate and HF uniformly at a volume ratio of 10: (1~4), place in a hydrothermal reaction kettle for constant temperature hydrothermal reaction, the temperature of the hydrothermal reaction is 150-200°C, and the hydrothermal The time of reaction is 15～30 hours;
(2)将步骤(1)水热反应后的固液混合物进行固液离心分离，弃去液体，将固态产物用去离子水洗涤2～5次，然后在60～90℃下烘干6～10小时；(2) Centrifuge the solid-liquid mixture after the hydrothermal reaction in step (1), discard the liquid, wash the solid product with deionized water for 2 to 5 times, and then dry it at 60 to 90°C for 6 to 5 times. 10 hours;
(3)将步骤(2)烘干后的产物研磨成粉末，得到{001}面暴露的TiO2纳米颗粒；(3) Grinding the dried product of step (2) into powder to obtain TiO nanoparticles exposed on the {001} face;
(4)将{001}面暴露的TiO2纳米颗粒与钼酸钠和硫脲按质量比100：(3～30)：(6～60)混合均匀，其中，钼酸钠和硫脲的质量比为1:2，置于水热反应釜中进行恒温水热反应，水热反应的温度为150～200℃，水热反应的时间为15～30小时；(4) Mix the TiO 2 nanoparticles exposed on the {001} surface with sodium molybdate and thiourea in a mass ratio of 100:(3~30):(6~60), wherein the mass ratio of sodium molybdate and thiourea The ratio is 1:2, placed in a hydrothermal reaction kettle for constant temperature hydrothermal reaction, the temperature of the hydrothermal reaction is 150-200°C, and the time of the hydrothermal reaction is 15-30 hours;
(5)将步骤(4)水热反应后的固液混合物进行固液离心分离，弃去液体，将固态产物用去离子水洗涤2～5次，然后在60～90℃下烘干6～10小时；(5) Centrifuge the solid-liquid mixture after the hydrothermal reaction in step (4), discard the liquid, wash the solid product with deionized water for 2 to 5 times, and then dry it at 60 to 90°C for 6 to 5 times. 10 hours;
(6)将步骤(5)烘干后的产物研磨成粉末，得到MoS2/TiO2二维复合纳米光催化剂。(6) Grinding the dried product in step (5) into powder to obtain the MoS 2 /TiO 2 two-dimensional composite nano photocatalyst.
上述MoS2/TiO2二维复合纳米光催化剂在催化领域的应用。Application of the above-mentioned MoS 2 /TiO 2 two-dimensional composite nano photocatalyst in the field of catalysis.
上述MoS2/TiO2二维复合纳米光催化剂在环境污染治理中的应用。Application of the above-mentioned MoS 2 /TiO 2 two-dimensional composite nano-photocatalyst in environmental pollution control.
本发明制备的MoS2/TiO2二维复合纳米光催化剂用于环境污染处理，例如水和空气的净化等。The MoS 2 /TiO 2 two-dimensional composite nano photocatalyst prepared by the invention is used for environmental pollution treatment, such as water and air purification and the like.
本发明具有以下优点和有益效果：The present invention has the following advantages and beneficial effects:
(1)本发明利用水热法制备的MoS2/TiO2二维复合纳米光催化剂，与{001}面暴露的TiO2纳米颗粒及标准样品P25相比，其光催化性能得到大大增强。(1) The MoS 2 /TiO 2 two-dimensional composite nano-photocatalyst prepared by the hydrothermal method in the present invention has greatly enhanced photocatalytic performance compared with the {001} exposed TiO 2 nanoparticles and the standard sample P25.
(2)本发明制备方法简单，制备过程易于控制，生产效率高，对光催化剂在环境污染处理的实际应用中将起到极大的推动作用。(2) The preparation method of the present invention is simple, the preparation process is easy to control, and the production efficiency is high, which will greatly promote the practical application of photocatalyst in environmental pollution treatment.
附图说明Description of drawings
图1为实施例1制备的MoS2/TiO2二维复合纳米光催化剂的透射电镜(TEM)图；Fig. 1 is the transmission electron microscope (TEM) picture of the MoS2/ TiO2 two -dimensional composite nano photocatalyst prepared in embodiment 1;
图2为实施例5、实施例6与实施例2制备的MoS2/TiO2二维复合纳米光催化剂的X-射线衍射(XRD)对比图；Fig. 2 is the X-ray diffraction (XRD) comparative figure of the MoS2/ TiO2 two -dimensional composite nano photocatalyst prepared by embodiment 5, embodiment 6 and embodiment 2;
图3为实施例5、实施例6与实施例3制备的MoS2/TiO2二维复合纳米光催化剂的紫外-可见(UV-Vis)吸收光谱对比图；Fig. 3 is the ultraviolet-visible (UV-Vis) absorption spectrum comparison diagram of the MoS2/ TiO2 two -dimensional composite nano photocatalyst prepared in embodiment 5, embodiment 6 and embodiment 3;
图4为实施例4制备的MoS2/TiO2二维复合纳米光催化剂的X射线光电子能谱(XPS)图；Fig. 4 is the X-ray photoelectron spectrum (XPS) figure of the MoS2/ TiO2 two -dimensional composite nano photocatalyst prepared in embodiment 4;
图5为实施例5、实施例6与实施例2制备的MoS2/TiO2二维复合纳米光催化剂在光照下对亚甲基蓝的降解效果对比图。Fig. 5 is a comparison chart of the degradation effect of the MoS 2 /TiO 2 two-dimensional composite nano-photocatalyst prepared in Example 5, Example 6 and Example 2 on methylene blue under light.
具体实施方式detailed description
下面结合附图和实施例对本发明进一步阐述，但并不因此将本发明限制在所述的实施例范围之内。The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the scope of the described embodiments.
实施例1Example 1
将钛酸四丁酯和HF按照体积比10:1混合成前驱液，将前驱液置于水热反应釜中进行水热反应，水热反应的温度为160℃，恒温时间为15小时；将水热反应后的固液混合物进行固液离心分离，弃去液体，将固态产物用去离子水洗涤2次，然后在60℃下烘干6小时；将烘干后的产物研磨成粉末，得到{001}面暴露的TiO2纳米颗粒；将{001}面暴露的TiO2纳米颗粒与钼酸钠和硫脲按照质量比100:3:6混合成前驱液，置于水热反应釜中进行水热反应，水热反应的温度为150℃，恒温时间为15小时；将水热反应后的固液混合物进行固液离心分离，弃去液体，将固态产物用去离子水洗涤2次，然后在60℃下烘干6小时；将烘干后的产物研磨成粉末，得到MoS2/TiO2二维复合纳米光催化剂。Mix tetrabutyl titanate and HF at a volume ratio of 10:1 to form a precursor solution, place the precursor solution in a hydrothermal reaction kettle for hydrothermal reaction, the temperature of the hydrothermal reaction is 160°C, and the constant temperature time is 15 hours; The solid-liquid mixture after the hydrothermal reaction is subjected to solid-liquid centrifugation, the liquid is discarded, the solid product is washed twice with deionized water, and then dried at 60°C for 6 hours; the dried product is ground into powder to obtain TiO 2 nanoparticles exposed on the {001} surface; the TiO 2 nanoparticles exposed on the {001} surface were mixed with sodium molybdate and thiourea at a mass ratio of 100:3:6 to form a precursor solution, and placed in a hydrothermal reaction kettle Hydrothermal reaction, the temperature of the hydrothermal reaction is 150°C, and the constant temperature time is 15 hours; the solid-liquid mixture after the hydrothermal reaction is subjected to solid-liquid centrifugation, the liquid is discarded, and the solid product is washed twice with deionized water, and then Drying at 60° C. for 6 hours; grinding the dried product into powder to obtain MoS 2 /TiO 2 two-dimensional composite nano photocatalyst.
实施例2Example 2
将钛酸四丁酯和HF按照体积比10:2混合成前驱液，将前驱液置于水热反应釜中进行水热反应，水热反应的温度为170℃，恒温时间为18小时；将水热反应后的固液混合物进行固液离心分离，弃去液体，将固态产物用去离子水洗涤3次，然后在70℃下烘干7小时；将烘干后的产物研磨成粉末，得到{001}面暴露的TiO2纳米颗粒；将{001}面暴露的TiO2纳米颗粒与钼酸钠和硫脲按照质量比100:6:12混合成前驱液，置于水热反应釜中进行水热反应，水热的反应温度为160℃，恒温时间为20小时；将水热反应后的固液混合物进行固液离心分离，弃去液体，将固态产物用去离子水洗涤3次，然后在70℃下烘干7小时；将烘干后的产物研磨成粉末，得到MoS2/TiO2二维复合纳米光催化剂。Tetrabutyl titanate and HF were mixed into a precursor solution at a volume ratio of 10:2, and the precursor solution was placed in a hydrothermal reaction kettle for hydrothermal reaction. The temperature of the hydrothermal reaction was 170°C, and the constant temperature time was 18 hours; The solid-liquid mixture after the hydrothermal reaction is subjected to solid-liquid centrifugation, the liquid is discarded, the solid product is washed 3 times with deionized water, and then dried at 70°C for 7 hours; the dried product is ground into powder to obtain TiO 2 nanoparticles exposed on the {001} surface; the TiO 2 nanoparticles exposed on the {001} surface were mixed with sodium molybdate and thiourea at a mass ratio of 100:6:12 to form a precursor solution, and placed in a hydrothermal reactor Hydrothermal reaction, the hydrothermal reaction temperature is 160°C, and the constant temperature time is 20 hours; the solid-liquid mixture after the hydrothermal reaction is subjected to solid-liquid centrifugation, the liquid is discarded, and the solid product is washed 3 times with deionized water, and then Drying at 70° C. for 7 hours; grinding the dried product into powder to obtain MoS 2 /TiO 2 two-dimensional composite nano photocatalyst.
实施例3Example 3
将钛酸四丁酯和HF按照体积比10:3混合成前驱液，将前驱液置于水热反应釜中进行水热反应，水热反应温度为180℃，恒温时间为24小时；将水热反应后的固液混合物进行固液离心分离，弃去液体，将固态产物用去离子水洗涤4次，然后在80℃下烘干8小时；将烘干后的产物研磨成粉末，得到{001}面暴露的TiO2纳米颗粒；将{001}面暴露的TiO2纳米颗粒与钼酸钠和硫脲按照质量比100:15:30混合成前驱液，置于水热反应釜中进行水热反应，水热的反应温度为170℃，恒温时间为25小时；将水热反应后的固液混合物进行固液离心分离，弃去液体，将固态产物用去离子水洗涤4次，然后在80℃下烘干8小时；将烘干后的产物研磨成粉末，得到MoS2/TiO2二维复合纳米光催化剂。Tetrabutyl titanate and HF were mixed into a precursor solution at a volume ratio of 10:3, and the precursor solution was placed in a hydrothermal reaction kettle for hydrothermal reaction. The hydrothermal reaction temperature was 180°C, and the constant temperature time was 24 hours; The solid-liquid mixture after thermal reaction is subjected to solid-liquid centrifugal separation, the liquid is discarded, the solid product is washed 4 times with deionized water, and then dried at 80°C for 8 hours; the dried product is ground into powder to obtain { TiO 2 nanoparticles exposed on the 001} surface; the TiO 2 nanoparticles exposed on the {001} surface were mixed with sodium molybdate and thiourea according to the mass ratio of 100:15:30 to form a precursor solution, and placed in a hydrothermal reactor for water Thermal reaction, the hydrothermal reaction temperature is 170 °C, and the constant temperature time is 25 hours; the solid-liquid mixture after the hydrothermal reaction is subjected to solid-liquid centrifugation, the liquid is discarded, and the solid product is washed 4 times with deionized water, and then in drying at 80° C. for 8 hours; grinding the dried product into powder to obtain the MoS 2 /TiO 2 two-dimensional composite nano photocatalyst.
实施例4Example 4
将钛酸四丁酯和HF按照体积比10:4混合成前驱液，将前驱液置于水热反应釜中进行水热反应，水热反应的温度为200℃，恒温时间为30小时；将水热反应后的固液混合物进行固液离心分离，弃去液体，将固态产物用去离子水洗涤5次，然后在90℃下烘干10小时；将烘干后的产物研磨成粉末，得到{001}面暴露的TiO2纳米颗粒；将{001}面暴露的TiO2纳米颗粒与钼酸钠和硫脲按照质量比100:30:60混合成前驱液，置于水热反应釜中进行水热反应，水热反应的温度为200℃，恒温时间为30小时；将水热反应后的固液混合物进行固液离心分离，弃去液体，将固态产物用去离子水洗涤5次，然后在90℃下烘干10小时；将烘干后的产物研磨成粉末，得到MoS2/TiO2二维复合纳米光催化剂。Tetrabutyl titanate and HF were mixed into a precursor solution at a volume ratio of 10:4, and the precursor solution was placed in a hydrothermal reaction kettle for hydrothermal reaction. The temperature of the hydrothermal reaction was 200°C, and the constant temperature time was 30 hours; The solid-liquid mixture after the hydrothermal reaction is subjected to solid-liquid centrifugation, the liquid is discarded, the solid product is washed 5 times with deionized water, and then dried at 90°C for 10 hours; the dried product is ground into powder to obtain TiO 2 nanoparticles exposed on the {001} surface; the TiO 2 nanoparticles exposed on the {001} surface were mixed with sodium molybdate and thiourea at a mass ratio of 100:30:60 to form a precursor solution, and placed in a hydrothermal reactor for Hydrothermal reaction, the temperature of the hydrothermal reaction is 200 ° C, and the constant temperature time is 30 hours; the solid-liquid mixture after the hydrothermal reaction is subjected to solid-liquid centrifugation, the liquid is discarded, and the solid product is washed 5 times with deionized water, and then Drying at 90° C. for 10 hours; grinding the dried product into powder to obtain MoS 2 /TiO 2 two-dimensional composite nano photocatalyst.
实施例5Example 5
将25L钛酸四丁酯和3L氢氟酸置于水热反应釜中，180℃水热反应24小时。待反应釜冷却至室温后，取出水热产物，并依次进行水洗、干燥，即得到{001}面暴露的TiO2纳米颗粒。Put 25L of tetrabutyl titanate and 3L of hydrofluoric acid in a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 180°C for 24 hours. After the reactor was cooled to room temperature, the hydrothermal product was taken out, washed with water and dried in sequence to obtain TiO 2 nanoparticles with exposed {001} faces.
实施例6Example 6
将600g钼酸钠和1200g硫脲置于水热反应釜中，180℃水热反应24小时。待反应釜冷却至室温后，取出水热产物，并依次进行水洗、干燥，即得到MoS2纳米颗粒。Put 600g of sodium molybdate and 1200g of thiourea in a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 180°C for 24 hours. After the reactor was cooled to room temperature, the hydrothermal product was taken out, washed with water and dried in sequence to obtain MoS 2 nanoparticles.
图1为实施例1制备的MoS2/TiO2二维复合纳米光催化剂的透射电镜(TEM)图。从图1中可以看出，实施例1制备的MoS2/TiO2二维复合纳米光催化剂为二维壳核形貌，晶格标定证实二维的MoS2包裹着TiO2纳米片形成二维复合材料。FIG. 1 is a transmission electron microscope (TEM) image of the MoS 2 /TiO 2 two-dimensional composite nanophotocatalyst prepared in Example 1. It can be seen from Figure 1 that the MoS 2 /TiO 2 two-dimensional composite nanophotocatalyst prepared in Example 1 has a two-dimensional core-shell morphology, and the lattice calibration confirms that two-dimensional MoS 2 wraps TiO 2 nanosheets to form a two-dimensional composite material.
图2为实施例5、实施例6与实施例2制备的MoS2/TiO2二维复合纳米光催化剂的X-射线衍射(XRD)对比图；从图2中可以看出，实施例2制备的MoS2/TiO2二维复合纳米光催化剂为纯锐钛矿相结构。Fig. 2 is the MoS of embodiment 5, embodiment 6 and embodiment 2 preparation 2 /TiO The X-ray diffraction (XRD) contrast figure of two -dimensional composite nano photocatalyst; As can be seen from Fig. 2, embodiment 2 prepares The MoS 2 /TiO 2 two-dimensional composite nanophotocatalyst has a pure anatase phase structure.
图3为实施例5、实施例6与实施例3制备的MoS2/TiO2二维复合纳米光催化剂的紫外-可见(UV-Vis)吸收光谱对比图；从图3中可以看出：实施例3制备的MoS2/TiO2二维复合纳米光催化剂光谱吸收情况介于实施例5和实施例6之间。Fig. 3 is embodiment 5, embodiment 6 and embodiment 3 MoS 2 /TiO The ultraviolet-visible (UV-Vis) absorption spectrum contrast figure of the two -dimensional composite nano photocatalyst prepared by embodiment 3; As can be seen from Fig. 3: implement The spectral absorption of the MoS 2 /TiO 2 two-dimensional composite nanophotocatalyst prepared in Example 3 is between that of Example 5 and Example 6.
图4为实施例4制备的MoS2/TiO2二维复合纳米光催化剂的X射线光电子能谱(XPS)图；从图4中可以看出：实施例4制备的MoS2/TiO2二维复合纳米光催化剂含有Mo。Figure 4 is the X-ray photoelectron spectrum (XPS) figure of the MoS 2 /TiO 2 two-dimensional composite nanophotocatalyst prepared in Example 4; as can be seen from Figure 4: the MoS 2 /TiO 2 two-dimensional composite prepared in Example 4 The composite nanophotocatalyst contains Mo.
图5为实施例5、实施例6与实施例2制备的MoS2/TiO2二维复合纳米光催化剂在光照下对染料水溶液亚甲基蓝的降解效果对比图；从图5中可以看出：实施例2制备的MoS2/TiO2二维复合纳米光催化剂光催化性能得到很大提高。Fig. 5 is the MoS 2 /TiO 2 two-dimensional composite nano-photocatalyst prepared in embodiment 5, embodiment 6 and embodiment 2 compares the degradation effect of dye aqueous solution methylene blue under light; As can be seen from Fig. 5: embodiment 2 The photocatalytic performance of the prepared MoS 2 /TiO 2 two-dimensional composite nano-photocatalyst has been greatly improved.
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