CN112495386A - 一种铈铜铁三元复合氧化物催化剂及制备方法和应用 - Google Patents
一种铈铜铁三元复合氧化物催化剂及制备方法和应用 Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 54
- 239000011206 ternary composite Substances 0.000 title claims abstract description 29
- DCJAPNLJBXPBCU-UHFFFAOYSA-N [Fe].[Cu].[Ce] Chemical compound [Fe].[Cu].[Ce] DCJAPNLJBXPBCU-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000010949 copper Substances 0.000 claims abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 7
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000035484 reaction time Effects 0.000 claims abstract description 4
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 3
- 239000002244 precipitate Substances 0.000 claims description 28
- 239000000243 solution Substances 0.000 claims description 20
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 claims description 19
- 229960000907 methylthioninium chloride Drugs 0.000 claims description 19
- 239000002351 wastewater Substances 0.000 claims description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000000227 grinding Methods 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 11
- 239000006228 supernatant Substances 0.000 claims description 10
- 239000003513 alkali Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000000870 ultraviolet spectroscopy Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 8
- 238000009210 therapy by ultrasound Methods 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 7
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 7
- 239000012498 ultrapure water Substances 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 150000000703 Cerium Chemical class 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 4
- 238000002835 absorbance Methods 0.000 claims description 2
- 239000002585 base Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 150000001879 copper Chemical class 0.000 claims description 2
- 150000002505 iron Chemical class 0.000 claims description 2
- 229910021529 ammonia Inorganic materials 0.000 claims 1
- 150000002823 nitrates Chemical class 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 11
- 230000003647 oxidation Effects 0.000 abstract description 9
- 238000007254 oxidation reaction Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 6
- 229910001868 water Inorganic materials 0.000 abstract description 6
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 8
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium nitrate Inorganic materials [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 description 7
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(III) nitrate Inorganic materials [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 230000003197 catalytic effect Effects 0.000 description 5
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 239000000975 dye Substances 0.000 description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000000593 degrading effect Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 2
- QQZMWMKOWKGPQY-UHFFFAOYSA-N cerium(3+);trinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O QQZMWMKOWKGPQY-UHFFFAOYSA-N 0.000 description 2
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 231100000086 high toxicity Toxicity 0.000 description 2
- SZQUEWJRBJDHSM-UHFFFAOYSA-N iron(3+);trinitrate;nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O SZQUEWJRBJDHSM-UHFFFAOYSA-N 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- SUDAKAMJKXJTSA-UHFFFAOYSA-N O.O.O.[N+](=O)(O)[O-].[Cu] Chemical compound O.O.O.[N+](=O)(O)[O-].[Cu] SUDAKAMJKXJTSA-UHFFFAOYSA-N 0.000 description 1
- 238000009303 advanced oxidation process reaction Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000979 synthetic dye Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- BZVJOYBTLHNRDW-UHFFFAOYSA-N triphenylmethanamine Chemical compound C=1C=CC=CC=1C(C=1C=CC=CC=1)(N)C1=CC=CC=C1 BZVJOYBTLHNRDW-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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- 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
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/83—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with rare earths or actinides
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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Abstract
一种铈铜铁三元复合氧化物催化剂及制备方法和应用,涉及催化剂技术领域,解决了现有废水处理催化剂制备方法繁琐,有机试剂使用较多,应用时重复利用性低,且反应时间长,效率低的问题,催化剂中铈、铜、铁的摩尔比为1.5:1.5:7;分子式为CeCuFeOx;铈铜铁三元复合氧化物催化剂制备方法简单,原料廉价易得,合成过程周期短,有一定的工业价值;铈铜铁三元复合氧化物催化剂,在超声波氧化水处理技术中具有良好的稳定性和活性,有利于其进行实际应用。
Description
技术领域
本发明涉及一种催化剂,尤其涉及一种铈铜铁三元复合氧化物催化剂及制备方法和应用。
背景技术
随着合成染料的在工业领域的广泛使用,染料废水呈现不断增加趋势,工业染料废水具有色度高、毒性大、难降解性等特点。其中属于氨基三苯甲烷类染料的结晶紫,应用范围广,具有高毒、高残留及“三致”性。对于废水中这些难降解染料,常规水处理技术难以达到有效处理效果。近年来,高级氧化技术逐渐成为处理该类废水的有效技术。高级氧化过程中其主要作用的是具有强氧化性的·OH。其中,超声波氧化技术是一种清洁无二次污染、快速降解污染物的高级氧化技术,具有操作简单、条件温和、适用范围广、对设备要求低等优点。但是对于难降解的有机化合物,单独采用超声波氧化技术存在降解效率低、能耗高等问题,难以达到降解的目的,从而限制了其在废水处理中的广泛应用。
因此,开发研究新型的超声波强化技术成为发展的的必然趋势。在众多超声强化技术中,投加金属单质或其氧化物具有无需增设复杂设备、投加物易于分离回收和重复使用的优点,大量研究发现在超声体系中引入金属(金属单质、金属氧化物、金属羟基化物等)可以有效提高有机物的降解速率。
作为催化剂制备材料的常见金属有Ti、Mn、Fe、Cu、Zn、Ce、Al等。尤其是过渡金属元素和稀土金属元素资源丰富、价格低廉、催化活性较高。单金属及双金属催化剂应用于催化氧化水处理的报道较多,但存在制备方法繁琐,有机试剂使用较多,应用时重复利用性低,且反应时间长,效率低等缺陷。
发明内容
为了解决上述问题,本发明提供了一种铈铜铁三元复合氧化物催化剂及制备方法和应用,提供一种制备简单、原料廉价、催化活性高的铈铜铁三元复合氧化物催化剂及制备方法,适用于催化超声波氧化水中该亚甲基蓝,可实现快速高效降解。为实现上述目的,本发明采取的技术方案为:一种铈铜铁三元复合氧化物催化剂,分子式为CeCuFeOx;催化剂中铈、铜、铁的摩尔比为1.5:1.5:7。
一种铈铜铁三元复合氧化物催化剂的制备方法,包括如下步骤:
1)按照铈、铜、铁为1.5:1.5:7的摩尔比称取总摩尔量为0.05 mol的四价铈盐、二价铜盐、三价铁盐,完全溶解于160 mL的超纯水中;
2)在搅拌条件下,向上述溶液中缓慢滴加2mol/L碱的水溶液溶液,使pH值调至9~10,继续搅拌1.5~2.5 h;
3)将所得沉淀物离心洗涤至pH为中性,在烘箱中100~120℃干燥20~48h;
4)将干燥后的沉淀物研磨后,置于马弗炉中400~500℃煅烧4~5h,自然冷却后得铈铜铁三元复合氧化物催化剂。
进一步地,步骤2)的碱的水溶液为氨水或氢氧化钠的水溶液。
进一步地,碱的水溶液的浓度为1.0~3.0 mol/L,优选为2 mol/L。
进一步地,步骤1)铈盐、铜盐、铁盐均为硝酸盐。
进一步地,步骤1)铁与铈、铜的摩尔比为0.01~0.05:0.001~0.005:0.001~0.005,优选为0.035:0.0025:0.0025。
进一步地,步骤2)反应时间为15~45 min,优选为30 min;反应温度为
20~30℃,优选为25℃。
进一步地,步骤3)烘箱的干燥时间优选为24h。
一种铈铜铁三元复合氧化物催化剂的应用,其过程在于以下步骤:
在100mL含亚甲基蓝初始浓度为15 mg/L的废水中,投加催化剂0.75g,超
声功率65w,调节初始pH值5,超声30 min后,在5000 r/min条件下离心15 min,取上清液于664 nm波长处用TU-1900型双光束紫外-可见分光光度计测其吸光度。
与现有技术相比,本发明具有以下有益效果:铈铜铁三元复合氧化物催化剂制备方法简单,原料廉价易得,合成过程周期短,有一定的工业价值;铈铜铁三元复合氧化物催化剂,在超声波氧化水处理技术中具有良好的稳定性和活性,有利于其进行实际应用。
具体实施方式
为了使本领域技术人员更好地理解本发明的技术方案,下面结合具体实施例对本发明作进一步的说明。
本发明所用的各种原料的规格及生产厂家的信息如表1所示。
表1 实施例所用原料规格及生产厂家的信息
试剂名称 | 分子式 | CAS | 规格 | 包装 | 厂商 |
六水硝酸铈 | Ce(NO<sub>3</sub>)<sub>3</sub>•6H<sub>2</sub>O | 10294-41-4 | 99.0% | 25 g | 国药集团化学试剂有限公司 |
三水硝酸铜 | Cu(NO<sub>3</sub>)<sub>2</sub>•3H<sub>2</sub>O | 10031-43-3 | 99.0% | 500 g | 西陇化工股份有限公司 |
九水硝酸铁 | Fe(NO<sub>3</sub>)<sub>3</sub>•9H<sub>2</sub>O | 7782-61-8 | 98.5% | 500 g | 国药集团化学试剂有限公司 |
氢氧化钠 | NaOH | XK13-201-00181 | 96.0% | 500 g | 北京化工试剂厂 |
氨水 | NH<sub>3</sub>·H<sub>2</sub>O | 1336-21-6 | 25~28% | 500mL | 北京化工试剂厂 |
下述实施例中,铁基金属复合氧化物的催化活性评价试验按照如下步骤进行:
模拟废水组成:废水体积100mL,含亚甲基蓝浓度为15mg/L。
超声波仪器:JY92-IIN型宁波新芝探头式超声破碎仪。
活性评价方法:在模拟废水中投加催化剂0.75g,超声频率24kHz,超声功率65w,调节初始pH值5,超声30min后,使用离心机以3000r/min的速度将反应后溶液离心10min,取上清液使用TU-1900型紫外可见分光光度计于664 nm波长处测定亚甲基蓝浓度,并计算去除率。
亚甲基蓝去除率的计算公式:采用紫外可见分光光度法检测结晶的浓度,在664nm波长下,通过吸光度-浓度绘制标准曲线从而计算亚甲基蓝去除率。
标准曲线:y = 0.2107x + 0.0072,R2=0.9997
实施例一
1.称取3.26g硝酸铈、14.42 g硝酸铁、1.85 g硝酸铜溶解于160mL超纯水中;
2.向上述溶液缓慢滴加2mol/L mol 碱的水溶液,使pH值调至9~10,继续搅拌2h;
3.所得沉淀物离心洗涤至pH为中性,在烘箱中100~120℃干燥10~15h;
4.将干燥后的沉淀物用玛瑙研钵研磨后,置于马弗炉中400~500℃煅烧4~6 h;
5.研磨后得到催化剂CeCuFeOx。
6.在100mL含亚甲基蓝初始浓度为15mg/L的废水中,投加催化剂0.75g,超声功率65w,调节初始pH值5,超声30min后,使用离心机以3000r/min的速度将反应后溶液离心10min,取上清液使用TU-1900型紫外可见分光光度计于664 nm波长处测定亚甲基蓝浓度,并计算去除率。
对比例一
1.称取12.34g硝酸铜溶解于160mL超纯水中;
2.向上述溶液缓慢滴加2mol/L mol 碱的水溶液,使pH值调至9~10,继续搅拌2h;
3.所得沉淀物离心洗涤至pH为中性,在烘箱中100~120℃干燥10~15h;
4.将干燥后的沉淀物用玛瑙研钵研磨后,置于马弗炉中400~500℃煅烧4~6 h;
5.研磨后得到催化剂CuO。
6.在100mL含亚甲基蓝初始浓度为15mg/L的废水中,投加催化剂0.75g,超声功率65w,调节初始pH值5,超声30min后,使用离心机以3000r/min的速度将反应后溶液离心10min,取上清液使用TU-1900型紫外可见分光光度计于664 nm波长处测定亚甲基蓝浓度,并计算去除率。
对比例二
1.称取21.73g硝酸铈溶解于160 mL超纯水中;
2.向上述溶液缓慢滴加2mol/L mol 碱的水溶液,使pH值调至9~10,继续搅拌2h;
3.所得沉淀物离心洗涤至pH为中性,在烘箱中100~120℃干燥10~15h;
4.将干燥后的沉淀物用玛瑙研钵研磨后,置于马弗炉中400~500℃煅烧4~6 h;
5.研磨后得到催化剂CeO2。
6.在100mL含亚甲基蓝初始浓度为15mg/L的废水中,投加催化剂0.75g,超声功率65w,调节初始pH值5,超声30min后,使用离心机以3000r/min的速度将反应后溶液离心10min,取上清液使用TU-1900型紫外可见分光光度计于664 nm波长处测定亚甲基蓝浓度,并计算去除率。
对比例三
1.称取5.55g硝酸铜、14.42 g硝酸铁溶解于160mL超纯水中;
2.向上述溶液缓慢滴加2mol/L mol 碱的水溶液,使pH值调至9~10,继续搅拌2h;
3.所得沉淀物离心洗涤至pH为中性,在烘箱中100~120℃干燥10~15h;
4.将干燥后的沉淀物用玛瑙研钵研磨后,置于马弗炉中400~500℃煅烧4~6 h;
5.研磨后得到催化剂CuFeOx。
6.在100mL含亚甲基蓝初始浓度为15mg/L的废水中,投加催化剂0.75g,超声功率65w,调节初始pH值5,超声30min后,使用离心机以3000r/min的速度将反应后溶液离心10min,取上清液使用TU-1900型紫外可见分光光度计于664 nm波长处测定亚甲基蓝浓度,并计算去除率。
对比例四
1.称取9.78g硝酸铈、14.42 g硝酸铁溶解于160mL超纯水中;
2.向上述溶液缓慢滴加2mol/L mol 碱的水溶液,使pH值调至9~10,继续搅拌2h;
3.所得沉淀物离心洗涤至pH为中性,在烘箱中100~120℃干燥10~15h;
4.将干燥后的沉淀物用玛瑙研钵研磨后,置于马弗炉中400~500℃煅烧4~6 h;
5.研磨后得到催化剂CeFeOx。
6.在100mL含亚甲基蓝初始浓度为15mg/L的废水中,投加催化剂0.75g,超声功率65w,调节初始pH值5,超声30min后,使用离心机以3000r/min的速度将反应后溶液离心10min,取上清液使用TU-1900型紫外可见分光光度计于664 nm波长处测定亚甲基蓝浓度,并计算去除率。
催化剂活性评价结果见表2。
表2 催化剂活性评价结果
编号 | 催化剂 | 去除率/% |
对比例1 | CuO | 31.49 |
对比例2 | CeO<sub>2</sub> | 20.08 |
对比例3 | CuFeO<sub>x</sub> | 78.13 |
对比例4 | CeFeO<sub>x</sub> | 85.58 |
实施例1 | CeCuFeO<sub>x</sub> | 88.11 |
从上表可以看出,本发明中所述铈铜铁三元复合氧化物,以铁为活性组分,相比于不含铁元素的单金属氧化物、双金属氧化物,加入铁元素后,复合物表现出更高的催化活性。本发明中的三元复合氧化物催化剂与超声波氧化技术联用后,超声催化降解亚甲基蓝的效率最高,可达88.11%,而单独超声降解亚甲基蓝的去除率低于10%。并且,本发明的三元复合氧化物催化剂制备工艺简单,操作方便,且难降解有机污染物去除效率高,在实际应用中,可大大节省成本。
利用本发明所述的技术方案,或本领域的技术人员在本发明技术方案的启发下,设计出类似的技术方案,而达到上述技术效果的,均是落入本发明的保护范围。
Claims (10)
1.一种铈铜铁三元复合氧化物催化剂,其特征是分子式为CeCuFeOx;催化剂中铈、铜、铁的摩尔比为1.5:1.5:7。
2.一种如权利要求1所述的铈铜铁三元复合氧化物催化剂的制备方法,其特征在于,包括如下步骤:
1)按照铈、铜、铁为1.5:1.5:7的摩尔比称取总摩尔量为0.05 mol的四价铈盐、二价铜盐、三价铁盐,完全溶解于160 mL的超纯水中;
2)在搅拌条件下,向上述溶液中缓慢滴加2mol/L碱的水溶液溶液,使pH值调至9~10,继续搅拌1.5~2.5 h;
3)将所得沉淀物离心洗涤至pH为中性,在烘箱中100~120℃干燥20~48h;
4)将干燥后的沉淀物研磨后,置于马弗炉中400~500℃煅烧4~5h,自然冷却后得铈铜铁三元复合氧化物催化剂。
3.根据权利要求2所述的铈铜铁三元复合氧化物催化剂的制备方法,其特征是步骤2)的碱的水溶液为氨水或氢氧化钠的水溶液。
4.根据权利要求3所述的铈铜铁三元复合氧化物催化剂的制备方法,其特征是碱的水溶液的浓度为1.0~3.0 mol/L。
5.根据权利要求2所述的铈铜铁三元复合氧化物催化剂的制备方法,其特征是步骤1)铈盐、铜盐、铁盐均为硝酸盐。
6.根据权利要求2所述的铈铜铁三元复合氧化物催化剂的制备方法,其特征是步骤1)铁与铈、铜的摩尔比为0.01~0.05:0.001~0.005:0.001~0.005。
7.根据权利要求2所述的铈铜铁三元复合氧化物催化剂的制备方法,其特征是步骤2)反应时间为15~45 min,反应温度为20~30℃。
8.根据权利要求2所述的铈铜铁三元复合氧化物催化剂的制备方法,其特征是步骤3)烘箱的干燥时间设置为24h。
9.一种如权利要求1-8任意一项所述的铈铜铁三元复合氧化物催化剂的应用,其特征在于铈铜铁三元复合氧化物催化剂用于废水处理。
10.根据权利要求9所述的铈铜铁三元复合氧化物催化剂的应用,其特征在于,包括以下步骤:
在100mL含亚甲基蓝初始浓度为15 mg/L的废水中,投加催化剂0.75g,超
声功率65w,调节初始pH值5,超声30 min后,在5000 r/min条件下离心15 min,取上清液于664 nm波长处用TU-1900型双光束紫外-可见分光光度计测其吸光度。
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