技术领域technical field
本发明涉及一种石墨相氮化碳纳米片/二氧化钛纳米管阵列光催化剂材料的制备方法，属于光催化环保纳米材料技术领域。The invention relates to a preparation method of a graphite-phase carbon nitride nanosheet/titanium dioxide nanotube array photocatalyst material, which belongs to the technical field of photocatalytic environment-friendly nanomaterials.
背景技术Background technique
氮化碳材料具有五种同素异形体，其中石墨相氮化碳材料是最稳定的一种。自2009年Antonietti等报道了石墨相氮化碳可用于光催化领域中(Nat.Mater.，2009，8，76-80.)，这种稳定性好、环保无毒、原料廉价的非金属材料在光催化等领域中得到了广泛的关注。石墨相氮化碳的禁带宽度为2.7eV，这使得它可以有效的吸收可见光，对太阳光有很高的利用效率。然而通过高温缩聚法煅烧石墨相氮化碳前驱体制备得到的体相石墨相氮化碳，由于比表面积较大、光生电子和空穴复合快等缺点，光催化效率仍有待提高。为了解决这些问题，对体相石墨相氮化碳进行掺杂、引入氮空位、与其他半导体材料耦合、形貌控制等调控，以有效提高其光催化效率。Carbon nitride material has five allotropes, among which graphite phase carbon nitride material is the most stable one. Since Antonietti et al. reported in 2009 that graphitic carbon nitride can be used in the field of photocatalysis (Nat.Mater., 2009, 8, 76-80.), this kind of non-metallic material with good stability, environmental protection, non-toxicity and cheap raw materials It has received extensive attention in the field of photocatalysis. The forbidden band width of graphitic carbon nitride is 2.7eV, which allows it to effectively absorb visible light and have a high utilization efficiency for sunlight. However, the photocatalytic efficiency of the bulk graphitic carbon nitride prepared by calcining the graphitic carbon nitride precursor by high-temperature polycondensation method still needs to be improved due to the disadvantages of large specific surface area and fast recombination of photogenerated electrons and holes. In order to solve these problems, the doping of bulk graphitic carbon nitride, the introduction of nitrogen vacancies, coupling with other semiconductor materials, and morphology control are regulated to effectively improve its photocatalytic efficiency.
纳米片由于其独特的结构，相对于传统纳米粒子往往具有高的光催化效率。石墨相氮化碳具有类似石墨的层状结构，可以通过剥离处理得到纳米片状的石墨相氮化碳以提高其光催化性能。目前已有很多报道通过不同的剥离方法成功制备了石墨相氮化碳纳米片，比如液相剥离(Advanced materials，2013，25，2452-2456；Journal of MaterialsChemistry A，2014，2，2563-2570.)，超声剥离(Applied Catalysis B：Environmental，2014，152-153，46-50.)，热氧化腐蚀剥离(Advanced Functional Materials，2012，22，4763-4770.)，化学剥离(Journal of Materials Chemistry A，2013，1，14766-14772)等。这些剥离后的石墨相氮化碳纳米片具有更大的比表面积，可以提供更多的反应活性位点并减少光生载流子复合效率，能够在一定程度上提高光催化反应的效率。然而，由于组分、结构单一，其光生电荷分离能力及光催化效率仍然有待提高。Due to their unique structure, nanosheets often have high photocatalytic efficiency compared with traditional nanoparticles. Graphite carbon nitride has a layered structure similar to graphite, and nanosheet-like graphitic carbon nitride can be obtained by exfoliation to improve its photocatalytic performance. There have been many reports on the successful preparation of graphitic carbon nitride nanosheets by different exfoliation methods, such as liquid phase exfoliation (Advanced materials, 2013, 25, 2452-2456; Journal of Materials Chemistry A, 2014, 2, 2563-2570. ), ultrasonic stripping (Applied Catalysis B: Environmental, 2014, 152-153, 46-50.), thermal oxidation corrosion stripping (Advanced Functional Materials, 2012, 22, 4763-4770.), chemical stripping (Journal of Materials Chemistry A , 2013, 1, 14766-14772) etc. These exfoliated graphitic carbon nitride nanosheets have a larger specific surface area, which can provide more reactive sites and reduce the recombination efficiency of photogenerated carriers, which can improve the efficiency of photocatalytic reactions to a certain extent. However, due to the single component and structure, its photogenerated charge separation ability and photocatalytic efficiency still need to be improved.
二氧化钛作为一种传统的n型半导体光催化剂，具有经济、无毒、稳定性能好、环境友好等优点，在光催化领域得到了广泛的研究和应用，是当前研究最多的光催化剂材料。然而，其禁带宽度为3.2eV，使得它对太阳光的利用效率低。将窄带隙的石墨相氮化碳与宽带隙的二氧化钛复合，可优化其可见光吸收并增强光生电话的分离，得到可见光催化性能良好的光催化材料。当前的研究仅集中在将石墨相氮化碳颗粒与纳米二氧化钛粒子复合。而有序排列的二氧化钛纳米管阵列比传统的二氧化钛材料具有更大的比表面积、更好的电子传输能力、循环使用性能好等优点，通过将石墨相氮化碳纳米片固定在二氧化钛纳米管阵列上可以有效的利用两者的优点，克服二氧化钛可见光响应差，光生电子和空穴复合速率快等缺点，可制备出便于循环使用的高效可见光催化剂新材料。As a traditional n-type semiconductor photocatalyst, titanium dioxide has the advantages of economy, non-toxicity, good stability, and environmental friendliness. It has been widely studied and applied in the field of photocatalysis, and is currently the most studied photocatalyst material. However, its bandgap of 3.2 eV makes it inefficient to use sunlight. Combining narrow-bandgap graphitic carbon nitride with wide-bandgap titanium dioxide can optimize its visible light absorption and enhance the separation of photogenerated phones, resulting in a photocatalytic material with good visible light catalytic performance. Current research has only focused on composites of graphitic carbon nitride particles with nanoscale titania particles. The ordered titanium dioxide nanotube array has the advantages of larger specific surface area, better electron transport capacity, and good recycling performance than traditional titanium dioxide materials. By immobilizing graphite phase carbon nitride nanosheets on the titanium dioxide nanotube array In fact, the advantages of both can be effectively utilized to overcome the shortcomings of titanium dioxide, such as poor response to visible light and fast recombination rate of photogenerated electrons and holes, and can prepare new materials with high efficiency visible light catalysts that are easy to recycle.
发明内容Contents of the invention
本发明针对单一氮化碳纳米片可见光催化效率低的问题，提供了一种简单的石墨相氮化碳纳米片/二氧化钛纳米管阵列光催化材料制备方法。该方法能将石墨相氮化碳纳米片快捷的固定在二氧化钛纳米管阵列上，该制备方法简单、快捷并便于操作，制备得到的光催化剂具有较好的可见光催化效率，有机染料罗丹明B的光催化降解有明显的效果。Aiming at the problem of low visible light catalytic efficiency of a single carbon nitride nanosheet, the invention provides a simple method for preparing a graphite-phase carbon nitride nanosheet/titanium dioxide nanotube array photocatalytic material. The method can quickly fix the graphitic carbon nitride nanosheets on the titanium dioxide nanotube array. The preparation method is simple, fast and easy to operate. Photocatalytic degradation has obvious effect.
本发明的技术方案如下：Technical scheme of the present invention is as follows:
1)将10g三聚氰胺放入带盖子的坩埚内，放置于马弗炉中，升温速率为10℃/min，升温至450～550℃煅烧2～4h，。煅烧结束后自然冷却到室温，将得到的样品研磨成粉末，制得体相石墨相氮化碳。1) Put 10g of melamine into a crucible with a lid, place it in a muffle furnace, heat up to 450-550°C for 2-4 hours at a heating rate of 10°C/min. After calcination, it was naturally cooled to room temperature, and the obtained sample was ground into powder to obtain bulk graphite phase carbon nitride.
2)取2g步骤1制备得到的体相石墨相氮化碳加入到30～60ml浓硫酸中并持续搅拌8h。然后将混合物缓慢倒入到200ml去离子水中，超声剥离6～10h，再进行1000rmp离心后将沉淀物用去离子水反复冲洗5～15次得到胶体状石墨相氮化碳纳米片，再将纳米片胶体溶液进一步超声粉碎0～60min得到尺寸更小的石墨相氮化碳纳米片；2) Add 2 g of the bulk graphite phase carbon nitride prepared in step 1 into 30-60 ml of concentrated sulfuric acid and keep stirring for 8 h. Then slowly pour the mixture into 200ml of deionized water, ultrasonically strip it for 6-10 hours, then centrifuge at 1000rmp and wash the precipitate with deionized water repeatedly for 5-15 times to obtain colloidal graphite phase carbon nitride nanosheets, and then The sheet colloidal solution was further ultrasonically pulverized for 0-60 minutes to obtain graphite phase carbon nitride nanosheets with smaller sizes;
3)将纯度＞99％的钛片经过酸洗，再在有机溶液和水中分别超声清洗15min得到阳极氧化制备二氧化钛纳米管阵列的基底材料；3) Pickling the titanium sheet with a purity >99%, and then ultrasonically cleaning it in organic solution and water for 15 minutes respectively to obtain the base material for anodizing to prepare titanium dioxide nanotube arrays;
4)取30～70ml步骤2中制备得到的浓度为0.05-0.2g/L的石墨相氮化碳纳米片，将石墨相氮化碳纳米片水溶液加入到配置好的阳极氧化电解液中搅拌均匀，在20V下阳极氧化2h，并且在阳极氧化过程中不断搅拌，搅拌速度为100转/分～500转/分。4) Take 30-70ml of the graphite phase carbon nitride nanosheets prepared in step 2 with a concentration of 0.05-0.2g/L, add the graphite phase carbon nitride nanosheet aqueous solution into the prepared anodic oxidation electrolyte and stir evenly , anodize at 20V for 2h, and keep stirring during the anodizing process, the stirring speed is 100rpm-500rpm.
5)阳极氧化结束后将无定形态的二氧化钛纳米管阵列样品取出进行热处理，以升温速度2℃/min从室温升温到400℃～500℃热处理1～3h。5) After the anodic oxidation, the amorphous titanium dioxide nanotube array sample was taken out for heat treatment, and the temperature was raised from room temperature to 400°C-500°C for 1-3 hours at a heating rate of 2°C/min.
其中，步骤3中酸洗溶液为水∶硝酸∶氢氟酸＝5∶4∶1(V/V/V)混合溶液；超声清洗有机溶液为丙酮，异丙醇，甲醇，乙醇；Wherein, the pickling solution in step 3 is water: nitric acid: hydrofluoric acid=5: 4: 1 (V/V/V) mixed solution; ultrasonic cleaning organic solution is acetone, isopropanol, methanol, ethanol;
步骤4中电解液为水∶丙三醇＝1∶1(v/v)，0.27M氟化铵混合溶液；In step 4, the electrolyte is water: glycerol=1:1 (v/v), 0.27M ammonium fluoride mixed solution;
与现有技术相比，本发明的有益效果是：本发明制备方法简单、经济便捷，制备的光催化剂具有优良的可见光催化性能，在可见光照射下能够高效的降解罗丹明B，是纯的二氧化钛纳米管的4倍。Compared with the prior art, the beneficial effects of the present invention are: the preparation method of the present invention is simple, economical and convenient, the prepared photocatalyst has excellent visible light catalytic performance, can efficiently degrade rhodamine B under visible light irradiation, and is pure titanium dioxide 4 times that of nanotubes.
附图说明Description of drawings
图1为实施例一步骤2制备得到的石墨相氮化碳纳米片透射电镜图；Fig. 1 is the graphitic phase carbon nitride nanosheet transmission electron micrograph that embodiment one step 2 prepares;
图2为实施例一制备得到的石墨相氮化碳纳米片/二氧化钛纳米管阵列的扫描电镜图；Fig. 2 is the scanning electron micrograph of the graphite phase carbon nitride nanosheet/titanium dioxide nanotube array prepared in embodiment one;
图3为实施例一制备得到的石墨相氮化碳纳米片/二氧化钛纳米管阵列的透射电镜图；Fig. 3 is the transmission electron microscope picture of the graphite phase carbon nitride nanosheet/titanium dioxide nanotube array prepared in embodiment one;
图4为实施例一制备得到的石墨相氮化碳纳米片/二氧化钛纳米管阵列的XRD图；Fig. 4 is the XRD pattern of the graphitic phase carbon nitride nanosheet/titanium dioxide nanotube array prepared in embodiment one;
图5为实施例一制备得到的石墨相氮化碳纳米片/二氧化钛纳米管阵列在可见光照射下光催化降解罗丹明B染料降解性能图；Figure 5 is a photocatalytic degradation performance diagram of rhodamine B dye degradation under visible light irradiation of the graphitic phase carbon nitride nanosheet/titanium dioxide nanotube array prepared in Example 1;
具体实施方式Detailed ways
以下为本发明的具体实施方式，进一步说明本发明，但本发明不局限于此。The following are specific embodiments of the present invention to further illustrate the present invention, but the present invention is not limited thereto.
具体实施方式一：本实施方式为石墨相氮化碳纳米片/二氧化钛纳米管阵列光催化材料的简便制备，具体步骤如下：Specific implementation mode 1: This implementation mode is a simple preparation of graphite-phase carbon nitride nanosheet/titanium dioxide nanotube array photocatalytic material, and the specific steps are as follows:
1)将10g三聚氰胺放入带盖子的坩埚内，放置于马弗炉中在温度为450～550℃煅烧2～4h，升温速率为10℃/min。煅烧结束后自然冷却到室温，将得到的样品研磨成粉末，制备得到了体相石墨相氮化碳；1) Put 10g of melamine into a crucible with a lid, place it in a muffle furnace and calcinate at a temperature of 450-550°C for 2-4 hours, with a heating rate of 10°C/min. After the calcination, it was naturally cooled to room temperature, and the obtained sample was ground into powder to prepare bulk graphite phase carbon nitride;
2)取2g步骤1制备得到的体相石墨相氮化碳加入到30～50ml浓硫酸中并持续搅拌8h。然后将混合物缓慢倒入到200ml去离子水中，超声剥离6～10h，再进行1000rmp离心后将沉淀物用去离子水反复冲洗5～15次得到胶体状石墨相氮化碳纳米片，再将纳米片胶体溶液进一步超声粉碎0～60min得到尺寸更小的石墨相氮化碳纳米片；2) Take 2g of the bulk graphitic carbon nitride prepared in step 1 and add it into 30-50ml of concentrated sulfuric acid and keep stirring for 8h. Then slowly pour the mixture into 200ml of deionized water, ultrasonically strip it for 6-10 hours, then centrifuge at 1000rmp and wash the precipitate with deionized water repeatedly for 5-15 times to obtain colloidal graphite phase carbon nitride nanosheets, and then The sheet colloidal solution was further ultrasonically pulverized for 0-60 minutes to obtain graphite phase carbon nitride nanosheets with smaller sizes;
3)将纯度＞99％的钛片经过酸洗，再于丙酮，异丙醇，甲醇，乙醇和水中分别超声清洗15min得到阳极氧化制备二氧化钛纳米管阵列的基底材料；3) pickling the titanium sheet with a purity >99%, and ultrasonically cleaning it in acetone, isopropanol, methanol, ethanol and water for 15 minutes respectively to obtain the base material for anodic oxidation to prepare titanium dioxide nanotube arrays;
4)取30～70ml步骤二中制备得到的浓度为0.1g/L的石墨相氮化碳纳米片，将石墨相氮化碳纳米片水溶液加入到水∶丙三醇＝1∶1(v/v)，0.27M氟化铵混合阳极氧化电解液中搅拌均匀，在20V下阳极氧化2h，并且在阳极氧化过程中不断搅拌，搅拌速度为100转/分～500转/分。4) Take 30-70ml of the graphite phase carbon nitride nanosheets prepared in step 2 with a concentration of 0.1g/L, and add the graphite phase carbon nitride nanosheets aqueous solution to water: glycerol = 1: 1 (v/ v), stir evenly in 0.27M ammonium fluoride mixed anodizing electrolyte, anodize at 20V for 2h, and keep stirring during the anodizing process, the stirring speed is 100-500 rpm.
5)阳极氧化结束后将无定形态的二氧化钛纳米管阵列样品取出进行热处理，以升温速度2℃/min从室温升温到400℃～500℃热处理1～3h。5) After the anodic oxidation, the amorphous titanium dioxide nanotube array sample was taken out for heat treatment, and the temperature was raised from room temperature to 400°C-500°C for 1-3 hours at a heating rate of 2°C/min.
具体实施例二：本实施方式与具体实施方式一不同的是步骤一中煅烧温度为520℃。其他与具体实施方式一相同。Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the calcination temperature in step 1 is 520°C. Others are the same as the first embodiment.
具体实施例三：本实施方式与具体实施方式一不同的是步骤二中使用去离子水冲洗次数为10次。其他与具体实施方式一相同。Specific embodiment 3: The difference between this embodiment and specific embodiment 1 is that the number of times of washing with deionized water in step 2 is 10 times. Others are the same as the first embodiment.
具体实施例四：本实施方式与具体实施方式一不同的是步骤二中超声粉碎时间为20～60min。其他与具体实施方式一相同。Specific embodiment 4: The difference between this embodiment and specific embodiment 1 is that the ultrasonic pulverization time in step 2 is 20-60 min. Others are the same as the first embodiment.
具体实施例五：本实施方式与具体实施方式一至四不同的是步骤二中超声粉碎时间为60min。其他与具体实施方式一相同。Specific embodiment five: the difference between this embodiment and specific embodiments one to four is that the ultrasonic pulverization time in step two is 60 minutes. Others are the same as the first embodiment.
具体实施例六：本实施方式与具体实施方式一不同的是步骤四中搅拌速度为200转/分。其他与具体实施方式一相同。Specific embodiment six: the difference between this embodiment and specific embodiment one is that the stirring speed in step four is 200 rpm. Others are the same as the first embodiment.
本发明使用以下实施例验证石墨相氮化碳纳米片/二氧化钛纳米管阵列光催化剂具有提高的可见光效率：The present invention uses the following examples to verify that the graphitic carbon nitride nanosheet/titanium dioxide nanotube array photocatalyst has improved visible light efficiency:
实施例一：Embodiment one:
a)将10g三聚氰胺放入带盖子的坩埚内，放置于马弗炉中在温度为520℃煅烧2h，升温速率为10℃/min。煅烧结束后自然冷却到室温，将得到的样品研磨成粉末，制备得到了体相石墨相氮化碳；a) Put 10 g of melamine into a crucible with a lid, and place it in a muffle furnace for calcination at a temperature of 520° C. for 2 hours, with a heating rate of 10° C./min. After the calcination, it was naturally cooled to room temperature, and the obtained sample was ground into powder to prepare bulk graphite phase carbon nitride;
b)取2g步骤一制备得到的体相石墨相氮化碳加入到40ml浓硫酸中并持续搅拌8h。然后将混合物缓慢倒入到200ml去离子水中，超声剥离8h，再进行1000rmp离心后将沉淀物用去离子水反复冲洗10次得到胶体状石墨相氮化碳纳米片，再将纳米片胶体溶液进一步超声粉碎60min得到尺寸更小的石墨相氮化碳纳米片；b) Add 2 g of the bulk graphitic carbon nitride prepared in step 1 into 40 ml of concentrated sulfuric acid and keep stirring for 8 h. Then the mixture is slowly poured into 200ml of deionized water, ultrasonically stripped for 8h, and then centrifuged at 1000rmp, the precipitate is repeatedly washed with deionized water for 10 times to obtain colloidal graphite phase carbon nitride nanosheets, and then the nanosheet colloidal solution is further Ultrasonic pulverization for 60 minutes to obtain graphite phase carbon nitride nanosheets with smaller size;
c)将纯度＞99％的钛片经过酸洗，再于丙酮，异丙醇，甲醇，乙醇和水中分别超声清洗15min得到阳极氧化制备二氧化钛纳米管阵列的基底材料；c) acid-washing the titanium sheet with a purity >99%, and then ultrasonically cleaning it in acetone, isopropanol, methanol, ethanol and water for 15 minutes respectively to obtain a base material for preparing titanium dioxide nanotube arrays by anodic oxidation;
d)取50ml步骤二中制备得到的浓度为0.1g/L的石墨相氮化碳纳米片，将石墨相氮化碳纳米片水溶液加入到水∶丙三醇＝1∶1(v/v)，0.27M氟化铵混合阳极氧化电解液中搅拌均匀，在20V下阳极氧化2h，并且在阳极氧化过程中不断搅拌，搅拌速度为200转/分。d) Take 50ml of the graphite phase carbon nitride nanosheets with a concentration of 0.1g/L prepared in step 2, and add the graphite phase carbon nitride nanosheets aqueous solution to water: glycerol=1:1 (v/v) , Stir evenly in 0.27M ammonium fluoride mixed anodizing electrolyte, anodize at 20V for 2h, and keep stirring during the anodizing process, the stirring speed is 200 rpm.
e)阳极氧化结束后将无定形态的二氧化钛纳米管阵列样品取出进行热处理，以升温速度2℃/min从室温升温到450℃热处理3h。e) After the anodic oxidation, the amorphous titanium dioxide nanotube array sample was taken out for heat treatment, and the temperature was raised from room temperature to 450° C. for 3 hours at a heating rate of 2° C./min.
通过本实施例步骤二得到的石墨相氮化碳纳米片的透射电镜图如图1所示，从图中可见得到的石墨相氮化碳为纳米片状；The transmission electron microscope image of the graphite phase carbon nitride nanosheets obtained in step 2 of this embodiment is shown in Figure 1, and it can be seen from the figure that the graphite phase carbon nitride nanosheets obtained are in the shape of nanosheets;
通过本实施例制备的石墨相氮化碳纳米片/二氧化钛纳米管阵列的扫描电镜俯视图如图2所示，由图可以观察到管口直径约为50～100nm的规则排列的二氧化钛纳米管阵列，并且在管口上没有被大量的石墨相氮化碳纳米片覆盖，这有利于二氧化钛纳米管阵列对光的吸收；The top view of the scanning electron microscope of the graphitic carbon nitride nanosheet/titanium dioxide nanotube array prepared by this embodiment is shown in Figure 2, and it can be observed from the figure that the regularly arranged titanium dioxide nanotube array with a diameter of about 50-100nm is observed. And the nozzle is not covered by a large number of graphitic carbon nitride nanosheets, which is conducive to the absorption of light by the titanium dioxide nanotube array;
通过本实施例制备的石墨相氮化碳纳米片/二氧化钛纳米管阵列的透射电镜图如图3所示，从图3三中观察到在二氧化钛纳米管的管壁上有少量的石墨相氮化碳纳米片紧密负载；The transmission electron micrograph of the graphite phase carbon nitride nanosheet/titanium dioxide nanotube array prepared by this embodiment is shown in Figure 3, and it is observed from Figure 3 that there is a small amount of graphite phase nitride on the tube wall of the titanium dioxide nanotube Carbon nanosheets are tightly loaded;
通过本实施例制备的石墨相氮化碳纳米片/二氧化钛纳米管阵列的XRD图如图4所示，从XRD图中可以观察到实施例一经过热处理得到的是锐钛矿相二氧化钛，并且在27.4°有一个微弱的峰对应石墨相氮化碳纳米片(002)晶面的衍射峰；The XRD pattern of the graphitic phase carbon nitride nanosheet/titanium dioxide nanotube array prepared by this embodiment is shown in Figure 4. From the XRD pattern, it can be observed that what Example 1 obtains through heat treatment is anatase phase titanium dioxide, and in There is a faint peak at 27.4° corresponding to the diffraction peak of the graphitic carbon nitride nanosheet (002) crystal plane;
为了验证实施例一得到的石墨相氮化碳纳米片/二氧化钛纳米管阵列光催化材料的可见光催化活性，具体步骤如下：In order to verify the visible light catalytic activity of the graphitic carbon nitride nanosheet/titanium dioxide nanotube array photocatalytic material obtained in Example 1, the specific steps are as follows:
取大小为2cm×2cm实施例一得到的石墨相氮化碳纳米片/二氧化钛纳米管阵列放置于30mL烧杯中，再加入20mL的浓度为5mg/L的罗丹明B溶液，于不断的磁力搅拌下置于300W氙灯下照射，氙灯上覆盖了一个420nm的滤光片滤去紫外光，每间隔30min快速取出4mL罗丹明B溶液并通过紫外分光光度计测量罗丹明B的吸光度变化，测量完后倒回继续反应；Take the graphitic phase carbon nitride nanosheet/titanium dioxide nanotube array obtained in Example 1 with a size of 2cm×2cm and place it in a 30mL beaker, then add 20mL of rhodamine B solution with a concentration of 5mg/L, and stir under constant magnetic force Place it under a 300W xenon lamp for irradiation. The xenon lamp is covered with a 420nm filter to filter out ultraviolet light. Quickly take out 4mL rhodamine B solution every 30 minutes and measure the absorbance change of rhodamine B with a UV spectrophotometer. continue to react
通过本实施例制备的石墨相氮化碳纳米片/二氧化钛纳米管阵列的可见光催化降解罗丹明B溶液随时间变化的降解效果如图5所示，从图中可见石墨相氮化碳纳米片/二氧化钛纳米管阵列具有良好的可见光催化性能，对罗丹明B溶液在300min内的降解达到了88％，相比未经负载的二氧化钛纳米管阵列降解效果提高了4倍，具有较高的可见光催化能力。Visible light-catalyzed degradation of rhodamine B solution by the graphitic phase carbon nitride nanosheet/titanium dioxide nanotube array prepared in this example. Titanium dioxide nanotube arrays have good visible light catalytic performance, and the degradation of rhodamine B solution within 300 minutes has reached 88%, which is 4 times higher than that of unloaded titanium dioxide nanotube arrays, and has higher visible light catalytic ability. .
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