CN102266764A - Expanded graphite/zinc oxide composite photocatalyst and preparation method thereof - Google Patents
Expanded graphite/zinc oxide composite photocatalyst and preparation method thereof Download PDFInfo
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 239000011787 zinc oxide Substances 0.000 title claims abstract description 61
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 53
- 239000010439 graphite Substances 0.000 title claims abstract description 53
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 35
- 239000002131 composite material Substances 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 42
- 239000002245 particle Substances 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 2
- DBJUEJCZPKMDPA-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O DBJUEJCZPKMDPA-UHFFFAOYSA-N 0.000 claims 2
- 239000000376 reactant Substances 0.000 claims 2
- 238000003828 vacuum filtration Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 abstract description 32
- 238000003756 stirring Methods 0.000 abstract description 12
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 abstract description 10
- 239000004246 zinc acetate Substances 0.000 abstract description 10
- 239000011259 mixed solution Substances 0.000 abstract description 7
- 238000005054 agglomeration Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000012295 chemical reaction liquid Substances 0.000 abstract 1
- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 description 21
- 229940012189 methyl orange Drugs 0.000 description 21
- 230000015556 catabolic process Effects 0.000 description 16
- 238000006731 degradation reaction Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 10
- 238000002835 absorbance Methods 0.000 description 7
- 239000002351 wastewater Substances 0.000 description 7
- 230000001699 photocatalysis Effects 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001027 hydrothermal synthesis Methods 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明涉及一种膨胀石墨氧化锌复合光催化剂及其制备方法，复合光催化剂组成包括：按重量百分比，10％～99％的膨胀石墨和1％～90％的氧化锌。制备方法包括：(1)向氢氧化钠溶液中按质量体积比1～2g∶100ml加入膨胀石墨，室温下搅拌0.5～3小时，得反应液；(2)将与氢氧化钠摩尔比为1∶0.1～5的乙酸锌溶液加入上述反应液中，在50℃～90℃下反应2～6小时，将混合液真空抽滤，滤渣在60℃～120℃下烘干即得。本发明既避免了自身粒子的团聚，也有效防止了膨胀石墨片层的重堆积；制备方法原料普通易得，成本低廉，具有良好的应用前景。The invention relates to an expanded graphite zinc oxide composite photocatalyst and a preparation method thereof. The composite photocatalyst comprises: 10%-99% of expanded graphite and 1%-90% of zinc oxide by weight percentage. The preparation method comprises: (1) adding expanded graphite to sodium hydroxide solution at a mass volume ratio of 1-2 g: 100 ml, and stirring at room temperature for 0.5-3 hours to obtain a reaction liquid; : Add 0.1-5 zinc acetate solution into the above reaction solution, react at 50°C-90°C for 2-6 hours, vacuum filter the mixed solution, and dry the filter residue at 60°C-120°C. The invention not only avoids the agglomeration of its own particles, but also effectively prevents the reaccumulation of expanded graphite sheets; the raw materials of the preparation method are common and easy to obtain, the cost is low, and it has good application prospects.
Description
技术领域 technical field
本发明属于氧化锌复合光催化剂及其制备领域，特别涉及一种膨胀石墨/氧化锌复合光催化剂及其制备方法。The invention belongs to the field of zinc oxide composite photocatalyst and its preparation, in particular to an expanded graphite/zinc oxide composite photocatalyst and its preparation method.
背景技术 Background technique
目前光催化氧化消除和降解污染物已成为环境领域较活跃的一个研究方向。与传统水处理技术中的物理方法相比，光催化氧化技术具有效率高、能耗低、操作简便、反应条件温和、适用范围广、降解污染物彻底等突出特点，在环境治理方面备受人们的青睐。与常用的二氧化钛光催化剂相比，氧化锌不仅能吸收太阳光中的紫外光，还能吸收大量的可见光且制备工艺简单。因此，氧化锌作为光催化剂具有更大的实际应用价值，利用纳米氧化锌作为污水处理的环境友好型光催化剂，已经成为世界范围的研究热点。目前，关于氧化锌的制备方法及其应用研究国内外已有较多报道。At present, the removal and degradation of pollutants by photocatalytic oxidation has become an active research direction in the field of environment. Compared with the physical methods in traditional water treatment technologies, photocatalytic oxidation technology has outstanding features such as high efficiency, low energy consumption, easy operation, mild reaction conditions, wide application range, and thorough degradation of pollutants. It is widely used in environmental governance. of favor. Compared with the commonly used titanium dioxide photocatalyst, zinc oxide can not only absorb ultraviolet light in sunlight, but also absorb a large amount of visible light, and the preparation process is simple. Therefore, zinc oxide has greater practical application value as a photocatalyst, and the use of nano-zinc oxide as an environmentally friendly photocatalyst for sewage treatment has become a research hotspot worldwide. At present, there have been many reports at home and abroad on the preparation method and application research of zinc oxide.
湿化学方法是制备纳米材料的主要方法，它具有设备较简单、能按化学计量进行反应、所得产品纯度高、粒度可控等特点。纳米氧化锌可通过水热法一步直接得到，但它是在高温高压下进行反应，对设备技术要求较高，且不利于工业化大规模生产。除水热法可直接得到氧化锌粉体外，其它湿化学方法，如化学沉淀法等，均需首先得到前驱物，由前驱物经热分解处理再得到纳米氧化锌。这种方法工艺***复杂，且由于增加了热分解过程，致使设备投资增加，能耗升高，产品成本加大。Wet chemical method is the main method for preparing nanomaterials, which has the characteristics of simple equipment, stoichiometric reaction, high purity of products, and controllable particle size. Nano-zinc oxide can be directly obtained in one step by hydrothermal method, but it is reacted under high temperature and high pressure, which requires high technical equipment and is not conducive to large-scale industrial production. In addition to the hydrothermal method that can directly obtain zinc oxide powder, other wet chemical methods, such as chemical precipitation, need to obtain the precursor first, and then obtain nano-zinc oxide from the precursor through thermal decomposition. The process system of this method is complex, and due to the increase of the thermal decomposition process, the equipment investment increases, the energy consumption increases, and the product cost increases.
纳米氧化锌光催化反应装置包括流化床、固定片、循环塔、膜反应器，但氧化锌粒径较小难以沉淀分离。一种解决方法就是把纳米氧化锌固定到一个合适的固体载体上，便于氧化锌光催化过程的实际应用。纳米氧化锌颗粒可以通过不同的技术被固定在陶瓷，玻璃，塑料，聚氯乙烯涂层织物上。但高效的有机物氧化需要吸附到氧化锌表面，因为光催化过程是在表面发生的。膨胀石墨做为新型的吸附材料，比表面积较大，为50-200m2/g，其内部有许多网状的孔，是一种很好的吸附材料，其吸附量明显高于活性炭。因此膨胀石墨可作为氧化锌的载体且膨胀石墨/氧化锌复合材料可以实现膨胀石墨的强吸附性能和氧化锌的光催化性能的有机结合，为处理污水中的污染物提供了一种新型、实用的环保材料。The nano-zinc oxide photocatalytic reaction device includes a fluidized bed, a fixed plate, a circulation tower, and a membrane reactor, but the particle size of the zinc oxide is small and it is difficult to precipitate and separate. One solution is to immobilize nano-ZnO on a suitable solid support to facilitate the practical application of ZnO photocatalytic process. Nano ZnO particles can be fixed on ceramics, glass, plastics, PVC coated fabrics by different techniques. However, efficient organic oxidation requires adsorption to the surface of ZnO because the photocatalytic process occurs on the surface. As a new type of adsorption material, expanded graphite has a large specific surface area of 50-200m 2 /g, and has many mesh holes inside. It is a good adsorption material, and its adsorption capacity is significantly higher than that of activated carbon. Therefore, expanded graphite can be used as a carrier of zinc oxide, and the expanded graphite/zinc oxide composite material can realize the organic combination of the strong adsorption performance of expanded graphite and the photocatalytic performance of zinc oxide, providing a new and practical solution for the treatment of pollutants in sewage. environmentally friendly materials.
发明内容 Contents of the invention
本发明所要解决的技术问题是提供一种膨胀石墨/氧化锌复合光催化剂及其制备方法，该催化剂既避免了自身粒子的团聚，也有效防止了膨胀石墨片层的重堆积；制备方法原料普通易得，成本低廉。The technical problem to be solved by the present invention is to provide an expanded graphite/zinc oxide composite photocatalyst and its preparation method. Easy to get and low cost.
本发明的一种膨胀石墨/氧化锌复合光催化剂，其组成包括：按重量百分比，10％～99％的膨胀石墨和1％～90％的氧化锌，纳米氧化锌均匀的负载到膨胀石墨表面的部分孔隙中。An expanded graphite/zinc oxide composite photocatalyst of the present invention comprises: by weight percentage, 10% to 99% of expanded graphite and 1% to 90% of zinc oxide, and the nanometer zinc oxide is evenly loaded on the surface of the expanded graphite in some of the pores.
所述复合光催化剂的组成包括：按重量百分比，50％～90％的膨胀石墨和10％～50％的氧化锌。The composition of the composite photocatalyst includes: by weight percentage, 50%-90% of expanded graphite and 10%-50% of zinc oxide.
所述氧化锌颗粒为纳米级，粒径为10～100nm。The zinc oxide particles are nanoscale, with a particle diameter of 10-100 nm.
本发明的一种膨胀石墨/氧化锌复合光催化剂的制备方法，包括：A kind of preparation method of expanded graphite/zinc oxide composite photocatalyst of the present invention comprises:
(1)向氢氧化钠溶液中按质量体积比1～2g∶100ml加入膨胀石墨，室温下搅拌0.5～3小时，得反应液；(1) Add expanded graphite to the sodium hydroxide solution at a mass volume ratio of 1 to 2 g: 100 ml, and stir at room temperature for 0.5 to 3 hours to obtain a reaction solution;
(2)将与氢氧化钠摩尔比为1∶0.1～5的乙酸锌溶液加入上述反应液中，在50℃～90℃下反应2～6小时，将混合液真空抽滤，滤渣在60℃～120℃下烘干即得。(2) Add zinc acetate solution with a molar ratio of 1:0.1 to 5 to sodium hydroxide to the above reaction solution, react at 50°C to 90°C for 2 to 6 hours, vacuum filter the mixture, and filter the residue at 60°C It can be obtained by drying at ~120°C.
所述步骤(1)中的氢氧化钠溶液浓度为0.1～1mol/L。The concentration of the sodium hydroxide solution in the step (1) is 0.1˜1 mol/L.
所述步骤(2)中的乙酸锌溶液浓度为0.1～0.5mol/L。The concentration of the zinc acetate solution in the step (2) is 0.1-0.5 mol/L.
所述步骤(2)中的优选反应温度为60℃，优选反应时间为3小时。The preferred reaction temperature in the step (2) is 60° C., and the preferred reaction time is 3 hours.
所述步骤(2)中的优选烘干温度为60℃～80℃。The preferred drying temperature in the step (2) is 60°C to 80°C.
有益效果Beneficial effect
(1)本发明氧化锌颗粒能均匀分散于膨胀石墨表面，两者间有较强的作用力，既避免了自身粒子的团聚，也有效防止了膨胀石墨片层的重堆积，结构上的优势使其具有膨胀石墨的吸附功能和氧化锌的光催化性能双重作用；(1) The zinc oxide particles of the present invention can be evenly dispersed on the surface of expanded graphite, and there is a strong force between the two, which not only avoids the agglomeration of its own particles, but also effectively prevents the heavy accumulation of expanded graphite sheets, and has structural advantages It has dual functions of the adsorption function of expanded graphite and the photocatalytic performance of zinc oxide;
(2)本发明的制备方法原料普通易得，成本低廉，制备过程简单安全，在废水处理领域中具有良好的应用前景。(2) The raw materials of the preparation method of the present invention are common and easy to obtain, the cost is low, the preparation process is simple and safe, and it has a good application prospect in the field of wastewater treatment.
具体实施方式 Detailed ways
下面结合具体实施例，进一步阐述本发明。应理解，这些实施例仅用于说明本发明而不用于限制本发明的范围。此外应理解，在阅读了本发明讲授的内容之后，本领域技术人员可以对本发明作各种改动或修改，这些等价形式同样落于本申请所附权利要求书所限定的范围。Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.
实施例1Example 1
向100mL浓度为1mol/L的氢氧化钠溶液中加入0.1g的膨胀石墨，室温下搅拌3小时；配置浓度为0.5mol/L的乙酸锌溶液100mL，缓慢滴加到上述溶液中，在60℃下搅拌2小时；将混合液真空抽滤，滤渣在60℃下烘干得到膨胀石墨/氧化锌复合光催化剂(25％膨胀石墨，75％氧化锌)，氧化锌颗粒粒径为30nm。之后在紫外灯照射下用该复合光催化剂降解甲基橙模拟废水，用紫外分光光度计测甲基橙降解前后的吸光度，得到甲基橙的降解率为58.12％。Add 0.1 g of expanded graphite to 100 mL of sodium hydroxide solution with a concentration of 1 mol/L, and stir at room temperature for 3 hours; configure 100 mL of zinc acetate solution with a concentration of 0.5 mol/L, slowly add it dropwise to the above solution, and heat at 60 °C Stir at low temperature for 2 hours; vacuum filter the mixed solution, and dry the filter residue at 60° C. to obtain an expanded graphite/zinc oxide composite photocatalyst (25% expanded graphite, 75% zinc oxide), and the particle size of the zinc oxide particle is 30nm. Afterwards, the composite photocatalyst was used to degrade methyl orange simulated wastewater under the irradiation of ultraviolet light, and the absorbance of methyl orange before and after degradation was measured by ultraviolet spectrophotometer, and the degradation rate of methyl orange was obtained as 58.12%.
实施例2Example 2
向100ml浓度为0.7mol/L的氢氧化钠溶液中加入0.5g的膨胀石墨，室温下搅拌0.5小时；配置浓度为0.3mol/L的乙酸锌溶液100mL，缓慢滴加到上述溶液中，在50℃下搅拌3小时；将混合液真空抽滤，滤渣在70℃下烘干得到膨胀石墨/氧化锌复合光催化剂(45％膨胀石墨，55％氧化锌)，氧化锌颗粒粒径为10nm。之后在紫外灯照射下用该复合光催化剂降解甲基橙模拟废水，用紫外分光光度计测甲基橙降解前后的吸光度，得到甲基橙的降解率为78.93％。Add 0.5 g of expanded graphite to 100 ml of sodium hydroxide solution with a concentration of 0.7 mol/L, and stir at room temperature for 0.5 hours; prepare 100 mL of zinc acetate solution with a concentration of 0.3 mol/L, and slowly add it dropwise to the above solution, at 50 Stir at ℃ for 3 hours; vacuum filter the mixed solution, and dry the filter residue at 70 ℃ to obtain an expanded graphite/zinc oxide composite photocatalyst (45% expanded graphite, 55% zinc oxide), and the particle size of the zinc oxide particle is 10nm. Afterwards, the composite photocatalyst was used to degrade methyl orange simulated wastewater under ultraviolet light irradiation, and the absorbance before and after methyl orange degradation was measured with an ultraviolet spectrophotometer, and the degradation rate of methyl orange was 78.93%.
实施例3Example 3
向100mL浓度为0.5mol/L的氢氧化钠溶液中加入1.0g的膨胀石墨，室温下搅拌0.5小时；配置浓度为0.2mol/L的乙酸锌溶液100mL，缓慢滴加到上述溶液中，在80℃下搅拌4小时；将混合液真空抽滤，滤渣在80℃下烘干得到膨胀石墨/氧化锌复合光催化剂(60％膨胀石墨，40％氧化锌)，氧化锌颗粒粒径为70nm。之后在紫外灯照射下用该复合光催化剂降解甲基橙模拟废水，用紫外分光光度计测甲基橙降解前后的吸光度，得到甲基橙的降解率为86.84％。Add 1.0 g of expanded graphite to 100 mL of sodium hydroxide solution with a concentration of 0.5 mol/L, and stir at room temperature for 0.5 hours; prepare 100 mL of zinc acetate solution with a concentration of 0.2 mol/L, slowly add it dropwise to the above solution, and Stir at ℃ for 4 hours; vacuum filter the mixed solution, and dry the filter residue at 80 ℃ to obtain an expanded graphite/zinc oxide composite photocatalyst (60% expanded graphite, 40% zinc oxide), and the particle size of the zinc oxide particle is 70nm. Afterwards, the composite photocatalyst was used to degrade methyl orange simulated wastewater under ultraviolet light irradiation, and the absorbance of methyl orange before and after degradation was measured with an ultraviolet spectrophotometer, and the degradation rate of methyl orange was obtained as 86.84%.
实施例4Example 4
向100ml浓度为0.5mol/L氢氧化钠溶液中加入1.5g的膨胀石墨，室温下搅拌0.5小时；配置浓度为0.1mol/L的乙酸锌溶液100mL，缓慢滴加到上述溶液中，在60℃下搅拌3小时；将混合液真空抽滤，滤渣在60℃下烘干得到膨胀石墨/氧化锌复合光催化剂(80％膨胀石墨，20％氧化锌)，氧化锌颗粒粒径为60nm。之后在紫外灯照射下用该复合光催化剂降解甲基橙模拟废水，用紫外分光光度计测甲基橙降解前后的吸光度，得到甲基橙的降解率为90.87％。Add 1.5g of expanded graphite to 100ml of 0.5mol/L sodium hydroxide solution, stir at room temperature for 0.5 hours; prepare 100mL of zinc acetate solution with a concentration of 0.1mol/L, slowly add it dropwise to the above solution, The mixture was stirred for 3 hours; the mixture was vacuum filtered, and the filter residue was dried at 60°C to obtain an expanded graphite/zinc oxide composite photocatalyst (80% expanded graphite, 20% zinc oxide), and the particle size of the zinc oxide particles was 60nm. Afterwards, the composite photocatalyst was used to degrade methyl orange simulated wastewater under the irradiation of ultraviolet light, and the absorbance before and after the degradation of methyl orange was measured with an ultraviolet spectrophotometer, and the degradation rate of methyl orange was obtained as 90.87%.
实施例5Example 5
向100ml浓度为0.3mol/L的氢氧化钠溶液中加入2.0g的膨胀石墨，室温下搅拌0.5小时；配置浓度为0.2mol的乙酸锌溶液100mL，缓慢滴加到上述溶液中，在80℃下搅拌3小时；将混合液真空抽滤，滤渣在80℃下烘干得到膨胀石墨/氧化锌复合光催化剂(75％膨胀石墨，25％氧化锌)，氧化锌颗粒粒径为80nm。之后在紫外灯照射下用该复合光催化剂降解甲基橙模拟废水，用紫外分光光度计测甲基橙降解前后的吸光度，得到甲基橙的降解率为92.11％。Add 2.0 g of expanded graphite to 100 ml of sodium hydroxide solution with a concentration of 0.3 mol/L, and stir at room temperature for 0.5 hours; prepare 100 mL of zinc acetate solution with a concentration of 0.2 mol, slowly add it dropwise to the above solution, and heat at 80 ° C Stir for 3 hours; vacuum filter the mixed solution, and dry the filter residue at 80° C. to obtain an expanded graphite/zinc oxide composite photocatalyst (75% expanded graphite, 25% zinc oxide), and the particle size of the zinc oxide particle is 80nm. Afterwards, the composite photocatalyst was used to degrade methyl orange simulated wastewater under the irradiation of ultraviolet light, and the absorbance before and after degradation of methyl orange was measured by ultraviolet spectrophotometer, and the degradation rate of methyl orange was obtained as 92.11%.
实施例6Example 6
向100ml浓度为0.5mol/L的氢氧化钠溶液中加入1.5g的膨胀石墨，室温下搅拌0.5小时；配置浓度为0.1mol的乙酸锌溶液100mL，缓慢滴加到上述溶液中，在60℃下搅拌3小时；将混合液真空抽滤，滤渣在60℃下烘干得到膨胀石墨/氧化锌复合光催化剂(85％膨胀石墨，15％氧化锌)，氧化锌颗粒粒径为70nm。之后在紫外灯照射下用该复合光催化剂降解甲基橙模拟废水，用紫外分光光度计测甲基橙降解前后的吸光度，得到甲基橙的降解率为97.46％。Add 1.5 g of expanded graphite to 100 ml of sodium hydroxide solution with a concentration of 0.5 mol/L, and stir at room temperature for 0.5 hours; configure 100 mL of zinc acetate solution with a concentration of 0.1 mol, slowly add it dropwise to the above solution, and heat at 60 ° C Stir for 3 hours; vacuum filter the mixed solution, and dry the filter residue at 60° C. to obtain an expanded graphite/zinc oxide composite photocatalyst (85% expanded graphite, 15% zinc oxide), and the particle size of the zinc oxide particle is 70nm. Afterwards, the composite photocatalyst was used to degrade methyl orange simulated wastewater under the irradiation of ultraviolet light, and the absorbance before and after degradation of methyl orange was measured with an ultraviolet spectrophotometer, and the degradation rate of methyl orange was obtained as 97.46%.
实施例7Example 7
向100mL浓度为0.5mol/L的氢氧化钠溶液中加入2.0的膨胀石墨，室温下搅拌0.5小时；配置浓度为0.1mol的乙酸锌溶液100mL，缓慢滴加到上述溶液中，在60℃下搅拌3小时；将混合液真空抽滤，滤渣在60℃下烘干得到膨胀石墨/氧化锌复合光催化剂(90％膨胀石墨，10％氧化锌)，氧化锌颗粒粒径为50nm。之后在紫外灯照射下用该复合光催化剂降解甲基橙模拟废水，用紫外分光光度计测甲基橙降解前后的吸光度，得到甲基橙的降解率为97.72％。Add 2.0 expanded graphite to 100mL of sodium hydroxide solution with a concentration of 0.5mol/L, and stir at room temperature for 0.5 hours; configure 100mL of zinc acetate solution with a concentration of 0.1mol, slowly add it dropwise to the above solution, and stir at 60°C 3 hours; the mixed solution was vacuum filtered, and the filter residue was dried at 60°C to obtain an expanded graphite/zinc oxide composite photocatalyst (90% expanded graphite, 10% zinc oxide), and the particle size of the zinc oxide particles was 50nm. Afterwards, the composite photocatalyst was used to degrade methyl orange simulated wastewater under the irradiation of ultraviolet light, and the absorbance before and after degradation of methyl orange was measured by ultraviolet spectrophotometer, and the degradation rate of methyl orange was obtained as 97.72%.
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| CN102580715A (en) * | 2012-01-10 | 2012-07-18 | 黑龙江大学 | Method for preparing zinc oxide/graphene composite from expanded graphite by stripping |
| CN103071498A (en) * | 2013-01-14 | 2013-05-01 | 杜亚丽 | A kind of preparation method of Cu2O composite photocatalyst |
| CN104475076A (en) * | 2014-12-11 | 2015-04-01 | 上海烟草集团有限责任公司 | Preparation method of graphene-nano zinc oxide composite photocatalytical material for adsorbing and degrading nitrosamine |
| CN104667902A (en) * | 2015-03-02 | 2015-06-03 | 哈尔滨理工大学 | Method for preparing ZnO-expanded graphite composite with sol method |
| CN105001443A (en) * | 2015-08-04 | 2015-10-28 | 北京化工大学 | Polyurethane sponge compositely modified through expanded graphite and zinc oxide and preparing method thereof |
| CN106565620A (en) * | 2016-11-18 | 2017-04-19 | 盐城工学院 | Method for preparing tetrazole compound |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102580715A (en) * | 2012-01-10 | 2012-07-18 | 黑龙江大学 | Method for preparing zinc oxide/graphene composite from expanded graphite by stripping |
| CN103071498A (en) * | 2013-01-14 | 2013-05-01 | 杜亚丽 | A kind of preparation method of Cu2O composite photocatalyst |
| CN103071498B (en) * | 2013-01-14 | 2015-04-22 | 杜亚丽 | A kind of preparation method of Cu2O composite photocatalyst |
| CN104475076A (en) * | 2014-12-11 | 2015-04-01 | 上海烟草集团有限责任公司 | Preparation method of graphene-nano zinc oxide composite photocatalytical material for adsorbing and degrading nitrosamine |
| CN104667902A (en) * | 2015-03-02 | 2015-06-03 | 哈尔滨理工大学 | Method for preparing ZnO-expanded graphite composite with sol method |
| CN105001443A (en) * | 2015-08-04 | 2015-10-28 | 北京化工大学 | Polyurethane sponge compositely modified through expanded graphite and zinc oxide and preparing method thereof |
| CN106565620A (en) * | 2016-11-18 | 2017-04-19 | 盐城工学院 | Method for preparing tetrazole compound |
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