CN108745357A - 一种Ag/Bi2WO6光催化剂及其制备方法 - Google Patents
一种Ag/Bi2WO6光催化剂及其制备方法 Download PDFInfo
- Publication number
- CN108745357A CN108745357A CN201810542025.2A CN201810542025A CN108745357A CN 108745357 A CN108745357 A CN 108745357A CN 201810542025 A CN201810542025 A CN 201810542025A CN 108745357 A CN108745357 A CN 108745357A
- Authority
- CN
- China
- Prior art keywords
- photochemical catalyst
- light
- obtains
- agno
- powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 8
- 238000007540 photo-reduction reaction Methods 0.000 claims abstract description 7
- 230000031700 light absorption Effects 0.000 claims abstract description 6
- 230000005855 radiation Effects 0.000 claims abstract description 5
- 239000002957 persistent organic pollutant Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 239000011259 mixed solution Substances 0.000 claims description 24
- 239000008367 deionised water Substances 0.000 claims description 20
- 229910021641 deionized water Inorganic materials 0.000 claims description 20
- 239000003643 water by type Substances 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 16
- 239000002243 precursor Substances 0.000 claims description 16
- 239000007864 aqueous solution Substances 0.000 claims description 14
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(I) nitrate Inorganic materials [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 14
- 230000015556 catabolic process Effects 0.000 claims description 12
- 238000006731 degradation reaction Methods 0.000 claims description 12
- 238000005286 illumination Methods 0.000 claims description 11
- 101710134784 Agnoprotein Proteins 0.000 claims description 10
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 9
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 9
- 238000007146 photocatalysis Methods 0.000 claims description 8
- 239000013049 sediment Substances 0.000 claims description 8
- 239000006228 supernatant Substances 0.000 claims description 8
- 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 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 229910052724 xenon Inorganic materials 0.000 claims description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000006555 catalytic reaction Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims description 2
- 235000019441 ethanol Nutrition 0.000 claims 1
- 230000001699 photocatalysis Effects 0.000 abstract description 13
- 238000003786 synthesis reaction Methods 0.000 abstract description 2
- 230000035484 reaction time Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 21
- 239000013078 crystal Substances 0.000 description 7
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 7
- 229940043267 rhodamine b Drugs 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000000593 degrading effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000009102 absorption Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910020350 Na2WO4 Inorganic materials 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/66—Silver or gold
- B01J23/68—Silver or gold with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/683—Silver or gold with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium with chromium, molybdenum or tungsten
- B01J23/687—Silver or gold with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium with chromium, molybdenum or tungsten with tungsten
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/10—Heat treatment in the presence of water, e.g. steam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/16—Reducing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
- B01J37/341—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
- B01J37/341—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation
- B01J37/344—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation of electromagnetic wave energy
- B01J37/346—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation of electromagnetic wave energy of microwave energy
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Toxicology (AREA)
- Health & Medical Sciences (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Thermal Sciences (AREA)
- Electromagnetism (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Catalysts (AREA)
Abstract
本发明公开了一种Ag/Bi2WO6光催化剂及其制备方法,先制备Bi2WO6粉体,再用模拟太阳光或可见光照射通过光照还原法将Ag沉积在Bi2WO6表面,制备出Ag/Bi2WO6光催化剂。本发明采用光照还原法合成Ag/Bi2WO6光催化剂,其操作简单,反应时间短,合成的Ag/Bi2WO6光催化剂增加了近红外区(750~1500nm)光吸收,具有表面等离子效应,光催化活性较高,改善了纯相Bi2WO6的催化效率,可用于降解有机污染物。
Description
技术领域
本发明属于功能材料领域,具体涉及一种近红外光下具光催化活性的Ag/Bi2WO6光催化剂及其制备方法。
背景技术
目前,水污染越来越严重,对人类的生存造成了一定的影响。半导体光催化技术是一种环境友好型催化的新技术,可以将低密度的太阳光能转化成高密度的化学能、电能,利用光降解和矿化水和空气中的各种污染物,因此半导体光催化技术是一种非常有潜力的污水处理技术。
Bi2WO6是一种新型的具有可见光响应且可见光光催化活性较好的窄带隙光催化材料。它是由Bi2O2层和WO6层沿着c轴交替组成的,为典型的钙钛矿层状结构。其禁带宽度约为2.72eV左右,相对于TiO2的禁带宽度(3.2eV)较窄,能被可见光激发。如Bi2WO6通过光照作用,价带电子受光激发跃迁并在价带留下相应的空穴,形成电子-空穴对,这些光生电子-空穴对由于氧化还原能力极强而易与有机物及高分子聚合物间发生氧化还原反应。但也因其禁带宽度较窄,使得光生电子-空穴的复合几率增加,降低了光量子的效率,从而影响到Bi2WO6的光催化性能。因此,可以通过在Bi2WO6表面负载贵金属来提高Bi2WO6的光催化性能。通过在半导体表面负载贵金属不仅可以提高光生电子-空穴对的分离率,还可以扩大光吸收范围,是增强半导体光催化活性的有效方法之一。
发明内容
本发明的目的在于提供一种近红外光下具光催化活性的Ag/Bi2WO6光催化剂及其制备方法,该方法制备的Ag/Bi2WO6光催化剂增加了近红外区(750~1500nm)光吸收,具有表面等离子共振效应,且在模拟太阳光下对罗丹明B具有较高的降解活性,提高了纯相Bi2WO6的光催化效率。
为达到上述目的,本发明的制备方法如下:
步骤1:将3mmolNa2WO4·2H2O和6mmolBi(NO3)3·5H2O溶于45mL去离子水中,室温搅拌均匀得到反应前驱液,将前驱液转移至微波水热反应釜中,微波功率为300W,在180℃下反应1h,待反应结束温度降至室温后,将反应釜取出,静置去除上清液,将沉淀物分别用无水乙醇和去离子水清洗,并在80℃下干燥,得到白色Bi2WO6粉体;
步骤2:取Bi2WO6粉体溶于去离子水中,超声分散均匀得到5mg/mL的Bi2WO6水溶液,取AgNO3在暗态下溶于去离子水中得到1.5~2.5mg/mL的AgNO3水溶液,再按AgNO3的加入量为Bi2WO6质量的3%和5%将暗态下制备的AgNO3水溶液在自然光下加入到Bi2WO6水溶液中,室温下搅拌得到混合溶液A;
步骤3:将混合溶液A置于XPA-3光化学反应仪中光照得到混合溶液B,将混合溶液B分别用无水乙醇和去离子水清洗,并在80℃下干燥,得到Ag负载Bi2WO6粉体,即Ag/Bi2WO6光催化剂。
所述步骤2中超声分散时间和室温搅拌时间均为30min。
所述步骤3中光照时间为30min,光照方式为模拟太阳光和可见光照射,光源分别为500W氙灯和500W氙灯加420nm滤光片,在模拟太阳光或可见光照射下,Bi2WO6价带激发产生的光生电子还原AgNO3为Ag沉积在Bi2WO6表面。
该催化剂由Ag和Bi2WO6组成,其中Ag/Bi2WO6为光照还原法制备,Bi2WO6为正交相,空间点群为Pca21(29),Ag为金属单质,且Ag沉积在Bi2WO6表面,为载流子传输体。
所述的Ag/Bi2WO6光催化剂增加了近红外区750~1500nm光吸收,具有表面等离子共振效应。
所述的Ag/Bi2WO6在模拟太阳光照射下对罗丹明B的降解率是纯相Bi2WO6的1.09~1.39倍,光催化剂可用于降解有机污染物。
相对于现有技术,本发明的有益效果为:
本发明提供的近红外光下具光催化活性的Ag/Bi2WO6光催化剂的制备方法,以Bi(NO3)3·5H2O为铋源,Na2WO4·2H2O为钨源,通过微波水热法制备出结晶度较高的Bi2WO6粉体;以AgNO3为银源,通过光还原法制备出Ag/Bi2WO6光催化剂。本发明采用光照还原法合成Ag/Bi2WO6光催化剂,其反应操作简单,合成的Ag/Bi2WO6光催化剂具有高的光催化活性,具有良好的应用前景。本发明制得的近红外光下具光催化活性的Ag/Bi2WO6光催化剂,该催化剂由Ag和Bi2WO6组成,其中Ag/Bi2WO6为光照还原法制备,Bi2WO6为正交相,空间点群为Pca21(29),Ag为金属单质,且Ag沉积在Bi2WO6表面,为载流子传输体。本发明制得的近红外光下具光催化活性的Ag/Bi2WO6光催化剂增加了近红外区(750~1500nm)光吸收,具有表面等离子共振效应(SPR效应),且降解活性较高,在模拟太阳光照射下对罗丹明B的降解率是纯相Bi2WO6的1.09~1.39倍,光催化剂可用于降解有机污染物。
附图说明
图1是本发明制备的Ag/Bi2WO6光催化剂的XRD图。
图2是本发明制备的Ag/Bi2WO6光催化剂的TEM图谱。
图3是本发明制备的Ag/Bi2WO6光催化剂的UV-Vis DRS图。
图4是本发明制备的Ag/Bi2WO6光催化剂在模拟太阳光照射下降解罗丹明B的降解曲线。
具体实施方式
下面结合具体实施例和附图对本发明作进一步详细说明。
实施例1:
步骤1:将3mmolNa2WO4·2H2O和6mmolBi(NO3)3·5H2O溶于45mL去离子水中,室温搅拌60min得到反应前驱液,将前驱液转移至微波水热反应釜中,微波功率为300W,在180℃下反应1h,待反应结束温度降至室温后,将反应釜取出,静置去除上清液,将沉淀物分别用无水乙醇和去离子水清洗3次,并在80℃下干燥,得到白色Bi2WO6粉体;
步骤2:称取0.5gBi2WO6粉体溶于100mL去离子水中,超声分散30min得到Bi2WO6水溶液,称取0.015gAgNO3在暗态下溶于10mL去离子水中,再将在暗态下制备的AgNO3溶液在自然光下加入到Bi2WO6水溶液中,室温下搅拌30min得到混合溶液A;
步骤3:将混合溶液A置于XPA-3光化学反应仪中,在模拟太阳光下光照30min后得到混合溶液B,将溶液B分别用无水乙醇和去离子水清洗3次,并在80℃下干燥,得到Ag负载Bi2WO6粉体,即Ag/Bi2WO6光催化剂。
实施例2:
步骤1:将3mmolNa2WO4·2H2O和6mmolBi(NO3)3·5H2O溶于45mL去离子水中,室温搅拌60min得到反应前驱液,将前驱液转移至微波水热反应釜中,微波功率为300W,在180℃下反应1h,待反应结束温度降至室温后,将反应釜取出,静置去除上清液,将沉淀物分别用无水乙醇和去离子水清洗3次,并在80℃下干燥,得到白色Bi2WO6粉体;
步骤2:称取0.5gBi2WO6粉体溶于100mL去离子水中,超声分散30min得到Bi2WO6水溶液,称取0.025gAgNO3在暗态下溶于10mL去离子水中,再将在暗态下制备的AgNO3溶液在自然光下加入到Bi2WO6水溶液中,室温下搅拌30min得到混合溶液A;
步骤3:将混合溶液A置于XPA-3光化学反应仪中,在模拟太阳光下光照30min后得到混合溶液B,将溶液B分别用无水乙醇和去离子水清洗3次,并在80℃下干燥,得到Ag负载Bi2WO6粉体,即Ag/Bi2WO6光催化剂。
实施例3:
步骤1:将3mmolNa2WO4·2H2O和6mmolBi(NO3)3·5H2O溶于45mL去离子水中,室温搅拌60min得到反应前驱液,将前驱液转移至微波水热反应釜中,微波功率为300W,在180℃下反应1h,待反应结束温度降至室温后,将反应釜取出,静置去除上清液,将沉淀物分别用无水乙醇和去离子水清洗3次,并在80℃下干燥,得到白色Bi2WO6粉体;
步骤2:称取0.5gBi2WO6粉体溶于100mL去离子水中,超声分散30min得到Bi2WO6水溶液,称取0.015gAgNO3在暗态下溶于10mL去离子水中,再将在暗态下制备的AgNO3溶液在自然光下加入到Bi2WO6水溶液中,室温下搅拌30min得到混合溶液A;
步骤3:将混合溶液A置于XPA-3光化学反应仪中,在可见光下光照30min后得到混合溶液B,将溶液B分别用无水乙醇和去离子水清洗3次,并在80℃下干燥,得到Ag负载Bi2WO6粉体,即Ag/Bi2WO6光催化剂。
实施例4
步骤1:将3mmolNa2WO4·2H2O和6mmolBi(NO3)3·5H2O溶于45mL去离子水中,室温搅拌60min得到反应前驱液,将前驱液转移至微波水热反应釜中,微波功率为300W,在180℃下反应1h,待反应结束温度降至室温后,将反应釜取出,静置去除上清液,将沉淀物分别用无水乙醇和去离子水清洗3次,并在80℃下干燥,得到白色Bi2WO6粉体;
步骤2:称取0.5gBi2WO6粉体溶于100mL去离子水中,超声分散30min得到Bi2WO6水溶液,称取0.025gAgNO3在暗态下溶于10mL去离子水中,再将在暗态下制备的AgNO3溶液在自然光下加入到Bi2WO6水溶液中,室温下搅拌30min得到混合溶液A;
步骤3:将混合溶液A置于XPA-3光化学反应仪中,在可见光下光照30min后得到混合溶液B,将溶液B分别用无水乙醇和去离子水清洗3次,并在80℃下干燥,得到Ag负载Bi2WO6粉体,即Ag/Bi2WO6光催化剂。
实施例5
步骤1:将3mmolNa2WO4·2H2O和6mmolBi(NO3)3·5H2O溶于45mL去离子水中,室温搅拌60min得到反应前驱液,将前驱液转移至微波水热反应釜中,微波功率为300W,在180℃下反应1h,待反应结束温度降至室温后,将反应釜取出,静置去除上清液,将沉淀物分别用无水乙醇和去离子水清洗3次,并在80℃下干燥,得到白色Bi2WO6粉体;
步骤2:称取0.5gBi2WO6粉体溶于100mL去离子水中,超声分散30min得到Bi2WO6水溶液,称取0.015gAgNO3在暗态下溶于7.5mL去离子水中,再将在暗态下制备的AgNO3溶液在自然光下加入到Bi2WO6水溶液中,室温下搅拌30min得到混合溶液A;
步骤3:将混合溶液A置于XPA-3光化学反应仪中,在模拟太阳光下光照30min后得到混合溶液B,将溶液B分别用无水乙醇和去离子水清洗3次,并在80℃下干燥,得到Ag负载Bi2WO6粉体,即Ag/Bi2WO6光催化剂。
实施例6
步骤1:将3mmolNa2WO4·2H2O和6mmolBi(NO3)3·5H2O溶于45mL去离子水中,室温搅拌60min得到反应前驱液,将前驱液转移至微波水热反应釜中,微波功率为300W,在180℃下反应1h,待反应结束温度降至室温后,将反应釜取出,静置去除上清液,将沉淀物分别用无水乙醇和去离子水清洗3次,并在80℃下干燥,得到白色Bi2WO6粉体;
步骤2:称取0.5gBi2WO6粉体溶于100mL去离子水中,超声分散30min得到Bi2WO6水溶液,称取0.025gAgNO3在暗态下溶于12.5mL去离子水中,再将在暗态下制备的AgNO3溶液在自然光下加入到Bi2WO6水溶液中,室温下搅拌30min得到混合溶液A;
步骤3:将混合溶液A置于XPA-3光化学反应仪中,在模拟太阳光下光照30min后得到混合溶液B,将溶液B分别用无水乙醇和去离子水清洗3次,并在80℃下干燥,得到Ag负载Bi2WO6粉体,即Ag/Bi2WO6光催化剂。
图1是本发明制备的Ag/Bi2WO6光催化剂的XRD图,其中a~d分别为实施例1~实施例4制备的Ag/Bi2WO6光催化剂的XRD图。从图中可以看出,微波水热法制备的Bi2WO6(BWO)的衍射峰与正交相Bi2WO6标准卡片(JCPDS NO.79-2381)吻合,在衍射角2θ=28.24°、32.88°、47.12°、55.96°和58.54°处的衍射峰分别对应于Bi2WO6的(131)晶面、(002)晶面、(202)晶面、(133)晶面和(262)晶面。负载Ag后,样品的衍射峰没有发生明显变化,且未观察到其它杂质峰,说明在负载过程中没有引入其它杂质。
图2是本发明按照实施例2制备的Ag/Bi2WO6光催化剂的TEM图谱。从TEM图中可以看出,负载Ag后,Bi2WO6表面沉积有Ag纳米粒子,可测出Bi2WO6的晶面间距分别为0.272nm和0.273nm,分别对应于正交相Bi2WO6(JCPDS No.79-2381)的(200)晶面和(002)晶面,Ag颗粒的晶面间距为0.286nm,对应Ag(JCPDS No.04-0783)的(012)晶面,Ag纳米粒子的尺寸为10~15nm。从TEM照片可以证明Ag被成功负载在Bi2WO6上,形成Ag/Bi2WO6光催化剂。
图3是本发明制备的Ag/Bi2WO6光催化剂的UV-Vis DRS图,其中c、d分别为实施例3和实施例4制备的Ag/Bi2WO6光催化剂的UV-Vis DRS图。从图中可以看出,Bi2WO6的吸收边带在418nm附近,负载Ag后,吸收边带未发生明显偏移,但增加了可见光及近红外区(750~1500nm)光吸收,说明负载Ag后能增强Bi2WO6的可见光吸收,且可以将光吸收范围扩宽至近红外区。
图4是本发明制备的Ag/Bi2WO6光催化剂在模拟太阳光下降解罗丹明B的降解曲线,其中a~d分别为按照实施例1~实施例4制备的Ag/Bi2WO6光催化剂在模拟太阳光下降解罗丹明B的降解曲线,纵坐标C/C0为某时刻罗丹明B降解后的浓度与其初始浓度的比值。从图中可以看到,模拟太阳光照射下,Ag/Bi2WO6光催化剂的光催化活性高于纯相Bi2WO6。在模拟太阳光照射下负载3%和5%的Ag/Bi2WO6在模拟太阳光下照射30min对RhB的降解率分别为92%和93%,在可见光下Ag负载量为3%和5%的Ag/Bi2WO6在模拟太阳光下照射30min对RhB的降解率分别为89%和92%。Ag/Bi2WO6光催化剂的降解速率是纯相Bi2WO6的1.09~1.39倍,提高了纯相Bi2WO6的光催化性能,这是因为Ag沉积在Bi2WO6表面,作为载流子传输体,可以提高光生电荷的分离率,且负载Ag后,将光吸收范围扩宽至近红外区,使得Ag/Bi2WO6光催化剂在近红外光下具有光催化活性,提高了纯相Bi2WO6的光催化性能。
以上所述仅为本发明的一种实施方式,不是全部或唯一的实施方式,本领域普通技术人员通过阅读本发明说明书而对本发明技术方案采取的任何等效的变换,均为本发明的权利要求所涵盖。
Claims (6)
1.一种Ag/Bi2WO6光催化剂的制备方法,其特征在于,包括以下步骤:
步骤1:将3mmolNa2WO4·2H2O和6mmolBi(NO3)3·5H2O溶于45mL去离子水中,室温搅拌均匀得到反应前驱液,将前驱液转移至微波水热反应釜中,微波功率为300W,在180℃下反应1h,待反应结束温度降至室温后,将反应釜取出,静置去除上清液,将沉淀物分别用无水乙醇和去离子水清洗,并在80℃下干燥,得到白色Bi2WO6粉体;
步骤2:取Bi2WO6粉体溶于去离子水中,超声分散均匀得到5mg/mL的Bi2WO6水溶液,取AgNO3在暗态下溶于去离子水中得到1.5~2.5mg/mL的AgNO3水溶液,再按AgNO3的加入量为Bi2WO6质量的3%和5%将暗态下制备的AgNO3水溶液在自然光下加入到Bi2WO6水溶液中,室温下搅拌得到混合溶液A;
步骤3:将混合溶液A置于XPA-3光化学反应仪中光照得到混合溶液B,将混合溶液B分别用无水乙醇和去离子水清洗,并在80℃下干燥,得到Ag负载Bi2WO6粉体,即Ag/Bi2WO6光催化剂。
2.根据权利要求1所述的Ag/Bi2WO6光催化剂的制备方法,其特征在于:所述步骤2中超声分散时间和室温搅拌时间均为30min。
3.根据权利要求1所述的Ag/Bi2WO6光催化剂的制备方法,其特征在于:所述步骤3中光照时间为30min,光照方式为模拟太阳光和可见光照射,光源分别为500W氙灯和500W氙灯加420nm滤光片,在模拟太阳光或可见光照射下,Bi2WO6价带激发产生的光生电子还原AgNO3为Ag沉积在Bi2WO6表面。
4.一种根据权利要求1所述的制备方法制成的Ag/Bi2WO6光催化剂,其特征在于:该催化剂由Ag和Bi2WO6组成,其中Ag/Bi2WO6为光照还原法制备,Bi2WO6为正交相,空间点群为Pca21(29),Ag为金属单质,且Ag沉积在Bi2WO6表面,为载流子传输体。
5.根据权利要求4所述的Ag/Bi2WO6光催化剂,其特征在于:所述的Ag/Bi2WO6光催化剂增加了近红外区750~1500nm光吸收,具有表面等离子共振效应。
6.根据权利要求4所述的Ag/Bi2WO6光催化剂,其特征在于:Ag/Bi2WO6在模拟太阳光照射下对罗丹明B的降解率是纯相Bi2WO6的1.09~1.39倍,光催化剂可用于降解有机污染物。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810542025.2A CN108745357A (zh) | 2018-05-30 | 2018-05-30 | 一种Ag/Bi2WO6光催化剂及其制备方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810542025.2A CN108745357A (zh) | 2018-05-30 | 2018-05-30 | 一种Ag/Bi2WO6光催化剂及其制备方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
CN108745357A true CN108745357A (zh) | 2018-11-06 |
Family
ID=64004368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201810542025.2A Pending CN108745357A (zh) | 2018-05-30 | 2018-05-30 | 一种Ag/Bi2WO6光催化剂及其制备方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN108745357A (zh) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112251831A (zh) * | 2020-11-09 | 2021-01-22 | 西安工程大学 | 一种杀菌自清洁光触媒纤维及其制备方法和应用 |
CN113788498A (zh) * | 2021-09-09 | 2021-12-14 | 同曦集团有限公司 | 一种兼具可见光催化空气净化与抗菌功能的材料及其制备方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102489298A (zh) * | 2011-12-15 | 2012-06-13 | 江南大学 | 一种贵金属负载型Bi2WO6可见光催化剂的制备方法 |
CN102553568A (zh) * | 2011-12-19 | 2012-07-11 | 陕西科技大学 | 采用高温微波水热法制备高光催化活性钨酸铋粉体的方法 |
-
2018
- 2018-05-30 CN CN201810542025.2A patent/CN108745357A/zh active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102489298A (zh) * | 2011-12-15 | 2012-06-13 | 江南大学 | 一种贵金属负载型Bi2WO6可见光催化剂的制备方法 |
CN102553568A (zh) * | 2011-12-19 | 2012-07-11 | 陕西科技大学 | 采用高温微波水热法制备高光催化活性钨酸铋粉体的方法 |
Non-Patent Citations (2)
Title |
---|
DANJUN WANG ET AL.: "Monodispersed Ag nanoparticles loaded on the surface of spherical Bi2WO6 nanoarchitectures with enhanced photocatalytic activities", 《JOURNAL OF MATERIALS CHEMISTRY》 * |
宋丽花等: "反应温度对微波水热法合成Bi2WO6粉体及光催化性能影响的研究", 《无机化学学报》 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112251831A (zh) * | 2020-11-09 | 2021-01-22 | 西安工程大学 | 一种杀菌自清洁光触媒纤维及其制备方法和应用 |
CN113788498A (zh) * | 2021-09-09 | 2021-12-14 | 同曦集团有限公司 | 一种兼具可见光催化空气净化与抗菌功能的材料及其制备方法 |
CN113788498B (zh) * | 2021-09-09 | 2023-09-29 | 同曦集团有限公司 | 一种兼具可见光催化空气净化与抗菌功能的材料及其制备方法 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN106944074B (zh) | 一种可见光响应型复合光催化剂及其制备方法和应用 | |
CN102671683B (zh) | 一种纳米片自组装C掺杂(BiO)2CO3微球可见光催化剂的制备方法 | |
CN101347725B (zh) | 碳纳米管/二氧化钛纳米复合光催化剂及其用途 | |
CN106824213B (zh) | 一种钴氧化物掺杂的碱式碳酸铋/氯氧化铋光催化剂及其制备方法 | |
CN108479759B (zh) | 一种可见光响应型镧掺杂钨酸铋催化剂及其制备方法 | |
CN107308957B (zh) | 一种球状Bi2S3/Bi2WO6异质结光催化材料的制备方法 | |
CN102513079A (zh) | 具有高效光电活性的可控晶形二氧化钛与石墨烯复合材料及其制备方法 | |
CN109174082A (zh) | 一种制备BiVO4/MnO2复合光催化氧化剂的方法 | |
CN103599802A (zh) | 一种磷酸银/石墨烯纳米复合材料的制备方法 | |
CN106362742B (zh) | 一种Ag/ZnO纳米复合物及其制备方法和应用 | |
CN110479341A (zh) | 一种氢化改性钒酸铋/类石墨相氮化碳复合光催化剂及其制备方法 | |
CN103191725A (zh) | BiVO4/Bi2WO6复合半导体材料及其水热制备方法和其应用 | |
CN106423223B (zh) | 一种饼状多孔结构MoSe2@TiO2光催化剂及其制备方法 | |
CN109482168A (zh) | 一种木质素碳/纳米二氧化钛复合光催化剂及其制备方法和应用 | |
CN105797762A (zh) | 一种光催化陶粒及制备方法和应用 | |
Yu et al. | Construction of rutile/anatase TiO2 homojunction and metal-support interaction in Au/TiO2 for visible photocatalytic water splitting and degradation of methylene blue | |
Xie et al. | Boosting the sonophotocatalytic performance of BiOCl by Eu doping: DFT and an experimental study | |
CN103785429B (zh) | 一种磷酸银/石墨烯/二氧化钛纳米复合材料及制备方法 | |
CN108745357A (zh) | 一种Ag/Bi2WO6光催化剂及其制备方法 | |
Zou et al. | Oxalic acid modified hexagonal ZnIn2S4 combined with bismuth oxychloride to fabricate a hierarchical dual Z-scheme heterojunction: Accelerating charge transfer to improve photocatalytic activity | |
Wang et al. | Effect of SrTiO3 amount and ultrasonic disperse on the thickness of Bi2O3 nanosheets and the photocatalytic performance of the composite α-Bi2O3/SrTiO3 | |
CN109382088A (zh) | SnO2/α~Bi2O3/β~Bi2O3复合材料及其制备方法 | |
CN108940325A (zh) | 一种二元复合半导体光催化剂材料Ag2CrO4/BiOI及其制备与应用 | |
CN113101980A (zh) | 一种具有可见光催化活性的TiO2/UiO-66复合材料的制备方法和应用 | |
CN108554427B (zh) | 一种In2O3/BiOI半导体复合光催化剂及其制备方法和用途 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181106 |
|
RJ01 | Rejection of invention patent application after publication |