CN112844361A - 一种Tb3+-B共掺杂改性TiO2光催化薄膜及其制备方法 - Google Patents
一种Tb3+-B共掺杂改性TiO2光催化薄膜及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种Tb3+‑B共掺杂改性TiO2光催化薄膜及其制备方法,属于光催化薄膜领域。本发明所述制备光催化薄膜的方法,包括如下步骤:(1)在钛酸四丁酯的乙醇溶液中加入聚乙稀吡咯烷酮,混合均匀,得到混合溶液;(2)在混合溶液中滴加硝酸溶液进行反应,形成溶胶液;(3)将六水合氯化铽的乙醇溶液加入溶胶液中,混匀;再加入EVA树脂的甲苯溶液,混匀,得到掺杂Tb3+的TiO2溶胶液;(4)将硼酸的乙醇溶液加入溶胶液中,混匀,得到掺杂Tb3+‑B的TiO2溶胶液;(5)将基材在掺杂Tb3+‑B的TiO2溶胶液浸渍,取出,干燥、煅烧、冷却得到光催化薄膜。本发明的改性TiO2薄膜制备方法简单,光催化能力强,而且具有抗菌防污的效果。
Description
技术领域
本发明涉及一种Tb3+-B共掺杂改性TiO2光催化薄膜及其制备方法,属于光催化薄膜领域。
背景技术
二氧化钛(TiO2)因其可见光透光率高、高折射率和化学稳定性好等优良特性在光催化降解有机物、防雾自清洁及染料敏化太阳能电池等方面展现出广阔的应用前景。但是TiO2的宽禁带、较高的载流子复合率等不足,限制了其光催化活性。
目前,国内外研究人员基于TiO2的改性的研究主要包括贵金属沉积、非金属离子改性、离子掺杂、半导体复合、表面光敏化等手段。但是这些改性方法都普遍存在价格昂贵、光催化效果存在不足、操作复杂、应用范围小等问题。
因此,如何制备一种性质稳定、绿色环保、应用广泛、制备方法简单、操作条件易控制、无二次污染、符合当代企业绿色发展的理念的改性TiO2光催化薄膜是目前亟需要解决的技术问题。
发明内容
为了解决上述至少一个问题,本发明提供了一种Tb3+-B共掺杂改性TiO2光催化薄膜及其制备方法,利用Tb3+-B的相互作用改善了TiO2光催化薄膜的催化性能,拓展了其应用范围。
本发明的第一个目的是提供一种制备Tb3+-B共掺杂改性TiO2光催化薄膜的方法,包括如下步骤:
(1)在钛酸四丁酯的乙醇溶液中加入聚乙稀吡咯烷酮,混合均匀,得到混合溶液;
(2)在步骤(1)的混合溶液中滴加硝酸溶液,混合均匀进行反应,形成溶胶液;
(3)将六水合氯化铽的乙醇溶液加入步骤(2)的溶胶液中,混合均匀;再加入EVA树脂的甲苯溶液,混合均匀,得到掺杂Tb3+的TiO2溶胶液;
(4)将硼酸的乙醇溶液加入步骤(3)的掺杂Tb3+的TiO2溶胶液中,混合均匀,得到掺杂Tb3+-B的TiO2溶胶液;
(5)将基材在步骤(4)的掺杂Tb3+-B的TiO2溶胶液浸渍,取出,干燥、煅烧、冷却得到Tb3+-B共掺杂改性TiO2光催化薄膜。
在本发明的一种实施方式中,步骤(1)所述的钛酸四丁酯的乙醇溶液中钛酸四丁酯和乙醇的质量比为1-2:4;进一步优选为1:4。
在本发明的一种实施方式中,步骤(1)所述的聚乙烯吡咯烷酮和钛酸四丁酯的质量比为1:18-22;进一步优选为1:20。
在本发明的一种实施方式中,步骤(1)所述的乙醇为无水乙醇。
在本发明的一种实施方式中,步骤(1)所述的混合均匀为常温(20-30℃),300-500rpm搅拌1-2h。
在本发明的一种实施方式中,步骤(2)所述的滴加速度为1-3mL/min,进一步优选为2mL/min。
在本发明的一种实施方式中,步骤(2)所述的混合溶液和硝酸溶液的体积比为10-14:1,进一步优选为12:1。
在本发明的一种实施方式中,步骤(2)所述的硝酸溶液为稀硝酸溶液,浓度为4-6mol/L,进一步优选为5mol/L。
在本发明的一种实施方式中,步骤(2)所述反应的条件为常温(20-30℃),300-500rpm搅拌2-5h。
在本发明的一种实施方式中,步骤(3)所述的六水合氯化铽的乙醇溶液中六水合氯化铽和乙醇的质量比为0.4-1:20;进一步优选为0.8:20。
在本发明的一种实施方式中,步骤(3)所述的六水合氯化铽的乙醇溶液与步骤(2)的溶胶液的体积比为1-3:65,进一步优选为2:65。
在本发明的一种实施方式中,步骤(3)所述的六水合氯化铽的乙醇溶液和步骤(2)的溶胶液的混合条件为300-500rpm磁力搅拌0.5-1.5h。
在本发明的一种实施方式中,步骤(3)所述的EVA树脂的甲苯溶液中EVA树脂和甲苯的质量比为1-2:35,进一步优选为1.5:35。
在本发明的一种实施方式中,步骤(3)所述的六水合氯化铽的乙醇溶液和EVA树脂的苯甲溶液的质量比为1-3:15,进一步优选为2:15。
在本发明的一种实施方式中,步骤(3)所述加入EVA树脂的甲苯溶液的反应条件为300-500rpm磁力搅拌0.5-1.5h。
在本发明的一种实施方式中,步骤(4)所述的硼酸的乙醇溶液中硼酸和乙醇的体积比为0.5-1.5:20,进一步优选为1:20。
在本发明的一种实施方式中,步骤(4)所述硼酸的乙醇溶液和步骤(3)的掺杂Tb3+的TiO2溶胶液的体积比为0.5-1.5:5,进一步优选为1:5。
在本发明的一种实施方式中,步骤(4)所述的混合均匀是300-500rpm磁力搅拌0.5-1.5h。
在本发明的一种实施方式中,步骤(5)所述的浸渍的时间为20-40min,温度为20-30℃,进一步优选为常温25℃浸渍30min。
在本发明的一种实施方式中,步骤(5)所述的干燥是在80-90℃下干燥8-12h,进一步优选为85℃下干燥10h。
在本发明的一种实施方式中,步骤(5)所述的煅烧是500-600℃下煅烧1-3h,进一步优选为550℃下煅烧2h,
本发明的第二个目的是本发明所述的方法制备得到的Tb3+-B共掺杂改性TiO2光催化薄膜。
本发明的第三个目的是本发明所述的Tb3+-B共掺杂改性TiO2光催化薄膜在光催化降解有机物、防雾自清洁或染料敏化太阳能电池领域的应用。
在本发明的一种实施方式中,所述的降解的有机物包括甲基绿、罗丹明B。
本发明的有益效果:
(1)本发明制备的改性TiO2薄膜,当Tb3+-B共进入TiO2晶格后,会引起晶格膨胀,使晶胞体积增大,表面羟基和表面吸附的O2-是光催化作用中有机物的重要中间体,而在有较大晶格膨胀的晶体中,存在着较大的晶格畸变和应变能,为了补偿这种晶格应力,TiO2晶格表层的氧原子容易逃离晶格而起到空穴俘获作用,从而降低了TiO2晶格中空穴和电子重新复合的几率,和非金属B共掺杂后,引起的电子自补偿效应应使得杂质能级处于满填充状态,可以有效减少光生载流子的复合机会,提高了光量子产率,改性了TiO2的光催化性能,并赋予特殊性能。
(2)本发明制备的改性TiO2薄膜性质稳定、绿色环保、应用广泛,制备方法简单、操作条件易控制、无二次污染、符合当代企业绿色发展的理念。
(3)本发明制备的改性TiO2薄膜对于金黄色葡萄球菌、大肠杆菌、肺炎克雷伯菌的抑菌率在80%以上,去污比值P在1.1以上,白度比值在1.0以上;可见光透过率在82%以上,对甲基绿的降解率在55%以上,罗丹明B的降解率在60%以上。
具体实施方式
以下对本发明的优选实施例进行说明,应当理解实施例是为了更好地解释本发明,不用于限制本发明。
实施例1
一种制备Tb3+-B共掺杂改性TiO2光催化薄膜的方法,包括如下步骤:
(1)称取15g钛酸四丁酯,溶于60g无水乙醇中,常温(25℃)下500rpm磁力搅拌1.5h,得到钛酸四丁酯的乙醇溶液;之后在钛酸四丁酯的乙醇溶液中加入0.75g聚乙稀吡咯烷酮,500rpm磁力搅拌1.5h,得到混合溶液;
(2)在60mL步骤(1)的混合溶液中滴加(滴加速度为2mL/min)5mL硝酸溶液(浓度为5mol/L),混合均匀进行反应,500rpm磁力搅拌反应4h,形成溶胶液;
(3)称取0.8g六水合氯化铽溶于20g无水乙醇中,常温(25℃)下500rpm磁力搅拌至完全溶解,得到六水合氯化铽的乙醇溶液;之后将2mL六水合氯化铽的乙醇溶液加入65mL步骤(2)的溶胶液中,500rpm磁力搅拌1h;再加入15mL EVA树脂的甲苯溶液(EVA和甲苯的质量比为1.5:35),500rpm磁力搅拌1h,得到掺杂Tb3+的TiO2溶胶液;
(4)称取1g硼酸溶于20g无水乙醇中,常温(25℃)下500rpm磁力搅拌至完全溶解,得到硼酸的乙醇溶液;之后将10mL硼酸的乙醇溶液加入50mL步骤(3)的掺杂Tb3+的TiO2溶胶液中,500rpm磁力搅拌1h,得到掺杂Tb3+-B的TiO2溶胶液;
(5)将基材在步骤(4)的掺杂Tb3+-B的TiO2溶胶液常温25℃浸渍30min,取出;在85℃下干燥10h、煅烧(550℃下煅烧2h)、冷却得到Tb3+-B共掺杂改性TiO2光催化薄膜。
实施例2
调整实施例1中的参数如表1所示,其他和实施例1保持一致,得到Tb3+-B共掺杂改性TiO2光催化薄膜。其中样品4是实施例1的光催化薄膜。
表1实施例2的参数设置
实施例3
将实施例2制备得到的Tb3+-B共掺杂改性TiO2光催化薄膜用于纺织品的抗菌除臭、去污整理,同时选择天然抗菌剂壳聚糖、无机金属纳米银抗菌剂、阴离子洗涤剂胰加漂T(209洗涤剂)、非离子洗涤剂(脂肪酰二乙醇胺)作为对照,具体的测试方法如下:
向无菌培养皿中加入9mL生理盐水、1mL活化的悬菌液(2.0×105CFU/mL)和琼脂培养基,分别加入样品1-11膜样片,以天然抗菌剂壳聚糖和无机金属纳米银抗菌剂作为对照组,震荡均匀后置于恒温恒湿(温度为37℃时间为24h)培养箱中,以5W的氙灯作为光源培养后,测试材料的抗菌性能,测试标准为GB/T37247-2018。
去污能力用去污比值P表示,抗污渍再沉积能529B用白度比值B值表示,按照国家标准GB/T 13174—2008《衣料用洗涤剂去污力和抗污渍再沉积能力的测定》;判定标准P≥1.0,表示测定洗涤剂的去污力优于标准洗衣粉;P<1,则表示去污力劣于标准洗衣粉;B≥1,表示测定洗涤剂的白度保持能力优于标准洗衣粉;B<1,则表示白度保持能力劣于标准洗衣粉。
测试结果如表2、表3所示。
表2实施例2的样品的抗菌性能测试结果
表3实施例2的样品的去污性能测试结果
样品 | 去污比值P | 白度比值B |
胰加漂T(209洗涤剂) | 0.8 | 0.9 |
脂肪酰二乙醇胺 | 0.7 | 0.7 |
1 | 1.1 | 0.8 |
2 | 1.1 | 0.8 |
3 | 1.2 | 1.0 |
4(实施例1) | 1.3 | 1.2 |
5 | 1.2 | 1.1 |
6 | 1.1 | 1.0 |
7 | 1.2 | 1.2 |
8 | 1.1 | 1.1 |
9 | 1.1 | 0.9 |
10 | 1.1 | 1.2 |
11 | 1.0 | 0.8 |
实施例4
将实施例2制备得到的样品(TiO2光催化薄膜)进行透光性能测试,测试方法为:
用双光束紫外可见分光光度计(TU-1900),波长扫描范围为300~700nm,测薄膜试样的透过率。
测试结果如表4所示:
表4实施例2的样品的透光性能测试结果
样品 | 可见光透过率(%) |
1 | 84 |
2 | 87 |
3 | 88 |
4(实施例1) | 91 |
5 | 85 |
6 | 82 |
7 | 87 |
8 | 76 |
9 | 67 |
10 | 64 |
11 | 76 |
从表4可以看出:离子掺杂量过高会引起介质中的分散性降低,破坏薄膜的稳定性,促进离子团聚,造成薄膜的透光性能下降。
实施例5
将实施例2的样品用于光催化降解染料,参考文献(李霞,张梅梅.溶胶—凝胶法TiO2光催化膜的制备与研究[J].山东轻工业学院学报:自然科学版,2001(4):45-48.)制备普通TiO2光催化薄膜。将未掺杂的普通TiO2光催化薄膜作对照,分别选取甲基绿、罗丹明B作为染料,配制浓度为10mg/L的染液,之后将10mg光催化薄膜放入染液,之后在室温,紫外光(30W)下照射2h;并用紫外可见分光光度计测试UV-Vis并计算降解率。测试结果如表5所示。
表5实施例2的样品的染料降解率的测试结果
从表5可以看出:共掺杂的降解效果好于稀土单掺杂,降解效果最好的样品4在紫外光下的甲基绿的降解率为82%,罗丹明B的降解率为88%,分别为未掺杂TiO2光催化薄膜的2.56和2.37倍。
实施例6
将实施例2的样品用于光催化降解染料,参考文献(李霞,张梅梅.溶胶—凝胶法TiO2光催化膜的制备与研究[J].山东轻工业学院学报:自然科学版,2001(4):45-48.)制备普通TiO2光催化薄膜。将未掺杂的普通TiO2光催化薄膜作对照,分别选取甲基绿、罗丹明B作为染料,配制浓度为10mg/L的染液,之后将10mg光催化薄膜放入染液,之后在常温,可见光(100W)下照射2h;并用紫外可见分光光度计测试UV-Vis并计算降解率。测试结果如表6所示。
表6实施例2的样品的染料降解率的测试结果
从表6可以看出:共掺杂的降解效果好于稀土单掺杂,降解效果最好的样品4在可见光下的甲基绿的降解率为65%,罗丹明B的降解率为67%,分别为未掺杂TiO2光催化薄膜的4.46和3.94倍。
虽然本发明已以较佳实施例公开如上,但其并非用以限定本发明,任何熟悉此技术的人,在不脱离本发明的精神和范围内,都可做各种的改动与修饰,因此本发明的保护范围应该以权利要求书所界定的为准。
Claims (10)
1.一种制备Tb3+-B共掺杂改性TiO2光催化薄膜的方法,其特征在于,包括如下步骤:
(1)在钛酸四丁酯的乙醇溶液中加入聚乙稀吡咯烷酮,混合均匀,得到混合溶液;
(2)在步骤(1)的混合溶液中滴加硝酸溶液,混合均匀进行反应,形成溶胶液;
(3)将六水合氯化铽的乙醇溶液加入步骤(2)的溶胶液中,混合均匀;再加入EVA树脂的甲苯溶液,混合均匀,得到掺杂Tb3+的TiO2溶胶液;
(4)将硼酸的乙醇溶液加入步骤(3)的掺杂Tb3+的TiO2溶胶液中,混合均匀,得到掺杂Tb3 +-B的TiO2溶胶液;
(5)将基材在步骤(4)的掺杂Tb3+-B的TiO2溶胶液浸渍,取出,干燥、煅烧、冷却得到Tb3+-B共掺杂改性TiO2光催化薄膜。
2.根据权利要求1所述的方法,其特征在于,步骤(1)所述的钛酸四丁酯的乙醇溶液中钛酸四丁酯和乙醇的质量比为1-2:4。
3.根据权利要求1或2所述的方法,其特征在于,步骤(1)所述的聚乙烯吡咯烷酮和钛酸四丁酯的质量比为1:18-22。
4.根据权利要求1-3任一项所述的方法,其特征在于,步骤(3)所述的六水合氯化铽的乙醇溶液中六水合氯化铽和乙醇的质量比为0.4-1:20。
5.根据权利要求1-4任一项所述的方法,其特征在于,步骤(3)所述的六水合氯化铽的乙醇溶液与步骤(2)的溶胶液的体积比为1-3:65。
6.根据权利要求1-5任一项所述的方法,其特征在于,步骤(3)所述的EVA树脂的甲苯溶液中EVA树脂和甲苯的质量比为1-2:35。
7.根据权利要求1-6任一项所述的方法,其特征在于,步骤(3)所述的六水合氯化铽的乙醇溶液和EVA树脂的苯甲溶液的质量比为1-3:15。
8.根据权利要求1-7任一项所述的方法,其特征在于,步骤(4)所述硼酸的乙醇溶液和步骤(3)的掺杂Tb3+的TiO2溶胶液的体积比为0.5-1.5:5。
9.权利要求1-8任一项所述的方法制备得到的Tb3+-B共掺杂改性TiO2光催化薄膜。
10.权利要求9所述的Tb3+-B共掺杂改性TiO2光催化薄膜在光催化降解有机物、防雾自清洁或染料敏化太阳能电池领域的应用。
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