CN113117700A - 一种Bi4O5Br2光催化材料的制备方法 - Google Patents
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- 230000001699 photocatalysis Effects 0.000 title claims abstract description 34
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- 238000000034 method Methods 0.000 title claims abstract description 13
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 claims abstract description 14
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- FBXVOTBTGXARNA-UHFFFAOYSA-N bismuth;trinitrate;pentahydrate Chemical compound O.O.O.O.O.[Bi+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FBXVOTBTGXARNA-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
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- 239000002244 precipitate Substances 0.000 claims description 8
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- 239000011941 photocatalyst Substances 0.000 claims description 5
- 238000003760 magnetic stirring Methods 0.000 claims description 4
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 4
- 239000012498 ultrapure water Substances 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 239000010865 sewage Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 abstract description 8
- 229940043267 rhodamine b Drugs 0.000 abstract description 8
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- 230000015556 catabolic process Effects 0.000 abstract description 4
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- 239000000126 substance Substances 0.000 abstract description 3
- 238000001556 precipitation Methods 0.000 abstract description 2
- 229910052724 xenon Inorganic materials 0.000 abstract description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 abstract description 2
- 238000002835 absorbance Methods 0.000 abstract 1
- 238000012512 characterization method Methods 0.000 abstract 1
- 239000007810 chemical reaction solvent Substances 0.000 abstract 1
- 238000011056 performance test Methods 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 238000003911 water pollution Methods 0.000 abstract 1
- 229910052797 bismuth Inorganic materials 0.000 description 6
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 230000000593 degrading effect Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000004298 light response Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000000026 X-ray photoelectron spectrum Methods 0.000 description 1
- 150000001622 bismuth compounds Chemical class 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000696 nitrogen adsorption--desorption isotherm Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
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Abstract
本发明提供了一种Bi4O5Br2光催化材料的制备方法，该方法以五水合硝酸铋、溴化钾为原料，乙二醇为反应溶剂，用一种简单易操作的室温沉淀法制备出Bi4O5Br2光催化材料。用氙灯作为光源，通过滤波片将低波长的光(λ<420nm)滤去，对Bi4O5Br2光催化材料进行光催化性能测试。通过降解罗丹明B，通过其在反应过程中吸光度值的变化来表征Bi4O5Br2光催化材料的光催化性能。该材料具有化学稳定性高、比表面积大、电子结构独特、光吸收能力较高等优点，使得它们在水污染治理方面具有广阔的应用前景。
Description
技术领域
本发明属于光催化材料制备领域，特别涉及一种Bi4O5Br2光催化材料的制备方法。
背景技术
在污水处理中，光催化氧化作为一种新型高级氧化技术，在光化学氧化基础上发展起来，具有氧化能力强和无二次污染等特点，其可在常温常压下进行，还具有环保、节能等特点。
铋基半导体是近年来发展起来的一类独特的新型光催化材料。由于Bi原子的特殊结构，其化合物很容易形成层状结构，产生具有可见光响应能力的铋系化合物。在先前的研究中，铋被用作氧化物光催化剂的掺杂剂，但后来的一些研究报道，铋系化合物显示出较高的光催化活性，为解决环境问题提供了一种思路。
其中，在富铋卤化物材料中的Bi4O5Br2因其化学稳定性高、比表面积大、独特的电子结构、较高的光吸收能力而备受关注，且研究表明其在有机物的降解方面具有优异的性能。
发明内容
本发明的目的是提供一种Bi4O5Br2光催化剂的制备方法，该催化剂的制备方法比较碱性条件下的水热合成法来说，降低了经济成本，简化了生产过程，制备的催化剂能够在可见光下降解罗丹明B，用于解决环境问题。
具体步骤为：
(1)将五水合硝酸铋溶于乙二醇中形成A溶液；将溴化钾加至A溶液中磁力搅拌至其溶解；
(2)向步骤(1)所得溶液中缓慢加入超纯水和一水合氨在室温下磁力搅拌；
(3)将步骤(2)得到的反应液过滤收集沉淀，洗涤沉淀物；
(4)将步骤(3)所得沉淀物干燥，研磨后即得Bi4O5Br2光催化材料。
优选的，所述步骤(1)磁力搅拌时间为30min。
优选的，所述步骤(2)磁力搅拌时间为6h。
优选的，所述干燥时间为12h。
上述制备Bi4O5Br2光催化材料，能够用于污水处理领域，由于Bi原子的特殊结构，其化合物很容易形成层状结构，产生具有可见光响应能力的铋系化合物。Bi4O5Br2光催化材料具有氧化能力强和无二次污染等特点，其可在常温常压下进行，且具有环保、节能等特点，为解决环境问题提供了一种思路。
本发明方法的优点：
(1)通过简单的室温沉淀法制备出了Bi4O5Br2光催化材料，方法简单易操作；
(2)制备的Bi4O5Br2光催化材料具有在可见光下有效降解罗丹明B的性能；
(3)制备的Bi4O5Br2光催化材料具有较好的循环稳定性，避免了进行一次光催化后材料的光催化效率大幅度降低的问题；
(4)运用简单，只需要将制备的Bi4O5Br2光催化材料粉末投入到一定浓度的罗丹明B溶液中，在可见光下就可以进行罗丹明B的降解。
附图说明
图1：Bi4O5Br2光催化材料的SEM图：(a)6000倍，(b)20000倍；
图2：Bi4O5Br2光催化材料的XRD谱图；
图3：Bi4O5Br2光催化材料的氮气吸附-脱附等温线(a)和孔径分布图(b)；
图4：Bi4O5Br2光催化材料的XPS图谱；
图5：不同光照时间下罗丹明B溶液的紫外-可见扫描图。
具体实施方式
下面结合具体的实施例对本发明做进一步的详细说明，所述是对本发明的解释而不是限定。
实施例：
按照以下步骤制备Bi4O5Br2材料：
(1)将5mmol五水合硝酸铋溶于20mL乙二醇中形成A溶液；准确称取5mmol溴化钾加至A溶液中磁力搅拌30min至其溶解；
(2)向步骤(1)所得溶液中缓慢加入8mL超纯水和2mL一水合氨在室温下搅拌6h；
(3)将步骤(2)得到的反应液通过真空过滤收集沉淀，并用超纯水和无水乙醇依次轮流清洗3次；
(4)将步骤(3)所得沉淀于60℃烘箱中干燥12h，研磨后即得Bi4O5Br2光催化材料。
在氙灯的照射下，利用滤波片将420nm以下的光滤去，利用罗丹明B的降解效率来表征其光催化性能。
Bi4O5Br2光催化材料化学稳定性高、比表面积大、具有独特的电子结构、较高的光吸收能力，在有机物的降解方面具有优异的性能。其在可见光区表现出较好的光催化活性，从而能对有机污染物高效降解。
Claims (6)
1.一种Bi4O5Br2光催化剂的制备方法，其特征在于具体步骤为：
(1)将五水合硝酸铋溶于乙二醇中形成A溶液；将溴化钾加至A溶液中磁力搅拌至其溶解；
(2)向步骤(1)所得溶液中缓慢加入超纯水和一水合氨室温下磁力搅拌；
(3)将步骤(2)得到的反应液过滤收集沉淀，洗涤沉淀物；
(4)将步骤(3)所得沉淀物干燥，研磨后即得Bi4O5Br2光催化材料。
2.根据权利要求1所述的方法，其特征在于：所述步骤(1)磁力搅拌时间为30min。
3.根据权利要求1所述的方法，其特征在于：优选的，所述步骤(2)磁力搅拌时间为6h。
4.根据权利要求1所述的方法，其特征在于：所述干燥时间为12h。
5.根据权利要求1所述的方法得到的Bi4O5Br2光催化材料。
6.根据权利要求1所述的方法得到的Bi4O5Br2光催化材料在污水处理领域的应用。
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| CN113976147B (zh) * | 2021-10-27 | 2024-01-26 | 汉江师范学院 | 一种Bi/Bi4O5Br2光催化剂、制备方法及其应用 |
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