CN105854928A - 一种分子筛负载金属改性TiO2的光催化剂制备方法 - Google Patents
一种分子筛负载金属改性TiO2的光催化剂制备方法 Download PDFInfo
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- 239000002808 molecular sieve Substances 0.000 title claims abstract description 29
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 title claims abstract description 29
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical class O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000011941 photocatalyst Substances 0.000 title abstract description 7
- 229910052751 metal Inorganic materials 0.000 title abstract description 5
- 239000002184 metal Substances 0.000 title abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 19
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 8
- 229910015221 MoCl5 Inorganic materials 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract 2
- 239000003054 catalyst Substances 0.000 claims description 18
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 14
- 238000001354 calcination Methods 0.000 claims 2
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000006731 degradation reaction Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
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- 230000031700 light absorption Effects 0.000 abstract 1
- GICWIDZXWJGTCI-UHFFFAOYSA-I molybdenum pentachloride Chemical compound Cl[Mo](Cl)(Cl)(Cl)Cl GICWIDZXWJGTCI-UHFFFAOYSA-I 0.000 abstract 1
- 231100000719 pollutant Toxicity 0.000 abstract 1
- 230000001699 photocatalysis Effects 0.000 description 9
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- 230000000694 effects Effects 0.000 description 4
- 238000007146 photocatalysis Methods 0.000 description 4
- 239000003905 agrochemical Substances 0.000 description 3
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241001124076 Aphididae Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
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- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
- B01J29/48—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively containing arsenic, antimony, bismuth, vanadium, niobium tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
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- B01J35/39—Photocatalytic properties
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Abstract
本发明涉及一种分子筛负载金属改性TiO2的光催化剂制备方法,属于有机农药降解光催化剂的制备方法领域。所述分子筛负载金属改性TiO2的光催化剂的制备方法,包括以下步骤:将无水乙醇分成等量的两份,第一份在搅拌的情况下加入钛酸四正丁酯,继续搅拌,将第二份与Fe3(NO4)3·9H2O和MoCl5混合,将两份溶液进行混合,并加入一定量的HZSM‑5分子筛,烘干,研磨成细粉,得到双金属改性TiO2负载分子筛。本发明所述制备方法,具有工艺简单、产品性能高等特点,本发明所制备的Mo‑Fe‑TiO2/HZSM‑5,有较高的可见光吸收率,可以取代TiO2以太阳光作为光源催化降解有机农药污染物,并且光催化的稳定性和重复利用性较高。
Description
技术领域
本发明涉及一种分子筛负载金属改性TiO2的光催化剂制备方法,属于有机农药等降解光催化剂的制备方法领域。
背景技术
氧化乐果等有机磷农药用于防治棉花、水稻、果树和甘蔗等农作物上的蚜虫、螨虫等害虫,具有良好的效果。但由于用量大,毒性强,可造成环境污染甚至影响生态平衡并危及人畜安全,因此对其进行有效地处理是人们普遍关注的问题。其中利用光催化剂光催化降解有机磷农药的研究已广泛展开。
二氧化钛(TiO2)作为一种应用广泛的宽带隙半导体材料,因其具有催化活性高、化学稳定性好、对人体无毒害、成本低廉等优点,被大量应用于有机农药降解等领域,被认为是最重要的光催化剂。但是宽带隙(3.2eV)导致TiO2对太阳光的利用率较低,很大程度上限制了TiO2在光催化方面的应用。
对TiO2进行掺杂改性,拓宽其光响应波长范围、增强其光催化活性,已经成为近年来的研究热点。TiO2的改性主要目的在于拓宽其光响应波长范围,最好能在可见光区也有良好的光催化活性。研究者们在这方面做了大量工作,掺杂元素包括贵金属、过渡金属、稀土元素以及碳、氮等非金属元素。这些研究均表明对TiO2掺杂后其吸收有较为明显的红移或紫移动,而且在可见光区的吸收也明显增强。但是,这一类的掺杂材料多为粉粒状,难以回收,在实际应用中容易浪费,而且易团聚,影响光催化效果。CN103537272A将TiO2负载到工业污泥、粘土、木屑、氢氧化钙原材料制成多孔状陶粒表面上,制成负载TiO2陶粒光催化剂,可同收性增强,但TiO2分散率较低,未到达纳米级别,催化性能并未明显提升,催化剂的重复利用性还有待提高。
总体来看,近几十年来,研究者们在TiO2光催化材料领域的研究已经取得了许多重要的成果,而且许多也已经用于实践。然而,这些技术及相关材料或多或少都存在一些问题。针对于此,本发明公布了一种低成本的分子筛负载金属改性TiO2的光催化剂制备方法。
发明内容
本发明的目的在于提供一种分子筛负载金属改性TiO2的光催化剂制备方法。
发明概述:
本发明所公开的分子筛负载金属改性TiO2的光催化剂制备方法,通过Mo和Fe共掺杂改性TiO2,并负载到HZSM-5分子筛上制备而成。本发明的原料廉价,工艺简单,所制备的光催化剂材料粒径均匀,比表面积大,光催化活性高,重复利用性较高,在红外-紫外-可见光区均有相当高的催化降解能力。
发明详述:
本发明所述的分子筛负载金属改性TiO2的光催化剂制备方法,包括如下步骤:
(1)取一定量的Fe3(NO4)3·9H2O,搅拌下按照摩尔比(1∶5)加入MoCl5和一定量的无水乙醇,分别配制成Mo-Fe/Ti摩尔百分含量为0.01%、0.05%、0.10%、0.50%的溶液A;
(2)取一定量的钛酸四正丁酯和浓盐酸溶解到无水乙醇中,搅拌均匀,制得溶液B;
(3)搅拌下将溶液A滴加到溶液B中,继续搅拌直至形成凝胶;
(4)按TiO2负载量1%-40%的要求,在溶胶中加入定量的HZSM-5分子筛,继续搅拌直至形成凝胶;
(5)凝胶在85℃下烘干12h,研磨成细粉;
(6)750℃马弗炉中烧3h,样品冷却后,研磨成粉末。
本发明所述的分子筛负载金属改性TiO2的光催化剂可用于有机农药等废水的催化降解,技术特点如下:
(1)本发明的光催化剂是Mo和Fe掺杂的改性TiO2,在红外-紫外-可见光区都具有相当高的光催化活性。
(2)本发明的载体分子筛是一种微小孔洞的材料,可以达到纳米级别,能提供独一无二的纳米微孔反应场。
(3)本发明将改性TiO2负载到分子筛孔道中,使用过程活性组分流失较少,催化剂的重复利用性较高。
与现有技术相比本发明的有益效果在于:本发明的分子筛负载金属改性TiO2的光催化剂将金属共掺杂改性和负载结合到一起,将TiO2进行了金属改性,拓宽了传统TiO2光催化材料的光响应波长范围,提高了其光催化活性,并将其负载到分子筛上,解决了光催化在应用中难回收和重复利用性低等问题。
具体实施方式
以下结合具体实施例对本发明进一步描述,这些实施例只为清楚公开本发明,但本发明的保护范围并不仅限于此。
实施例1
(1)取10ml的Fe3(NO4)3·9H2O,搅拌下同摩尔加入MoCl5和30ml无水乙醇,分别配制成Mo-Fe/Ti摩尔百分含量为0.05%的溶液;
(2)取10mL的钛酸四正丁酯和0.5mL的浓盐酸溶解到30mL无水乙醇中,搅拌均匀,制得溶液;
(3)搅拌下将步骤(1)溶液滴加到步骤(2)溶液中,继续搅拌直至形成凝胶;
(4)按TiO2负载量20%的要求,在溶胶中加入定量的HZSM-5分子筛,继续搅拌直至形成凝胶;
(5)凝胶在85℃下烘干12h,研磨成细粉;
(6)750℃马弗炉中烧3h,样品冷却后,研磨成粉末,最终得到双金属改性TiO2负载分子筛的光催化剂。
实施例2
(1)取10ml的Fe3(NO4)3·9H2O,搅拌下摩尔比1∶2加入MoCl5和50ml无水乙醇,分别配制成Mo-Fe/Ti摩尔百分比为1∶2∶100的溶液;
(2)取10mL的钛酸四正丁酯和0.5mL的浓盐酸溶解到50mL无水乙醇中,搅拌均匀,制得溶液;
(3)搅拌下将步骤(1)溶液滴加到步骤(2)溶液中,继续搅拌直至形成凝胶;
(4)按TiO2负载量30%的要求,在溶胶中加入定量的HZSM-5分子筛,继续搅拌直至形成凝胶;
(5)凝胶在85℃下烘干10h,研磨成细粉;
(6)800℃马弗炉中烧4h,样品冷却后,研磨成粉末,最终得到双金属改性TiO2负载分子筛的光催化剂。
本发明所述的实施例1~2仅仅是对本发明的优选实施方式进行的描述,并非对本发明构思和范围进行限定,在不脱离本发明设计思想的前提下,本领域中工程技术对本发明的技术方案作出的各种修改和改进,均应落入本发明的保护范围。
Claims (5)
1.分子筛负载金属改性TiO2的光催化剂的制备方法,包括以下步骤:
将无水乙醇分成等量的两份,第一份在搅拌的情况下加入钛酸四正丁酯,继续搅拌,将第二份与Fe3(NO4)3·9H2O和MoCl5混合,将两份溶液进行混合,并加入一定量的HZSM-5分子筛,烘干,研磨成细粉,得到双金属改性TiO2负载分子筛。
2.根据权利要求1所述的分子筛负载金属改性TiO2的光催化剂的制备方法,其特征在于所述Mo/Fe/Ti摩尔用量比为1∶(1-3)∶(10-100)。
3.根据权利要求1所述的分子筛负载金属改性TiO2的光催化剂的制备方法,其特征在于所述TiO2/HZSM-5摩尔用量比为20%。
4.根据权利要求1所述的分子筛负载金属改性TiO2的光催化剂的制备方法,其特征在于所述分子筛的选取可以为3A、4A、5A、3X-APG性等。
5.根据权利要求1所述的分子筛负载金属改性TiO2的光催化剂的制备方法,其特征在于所述的灼烧温度为750℃,灼烧时间为3h。
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CN106824255A (zh) * | 2017-03-28 | 2017-06-13 | 沈阳理工大学 | 一种具有光催化功能的分子筛的制备方法 |
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