CN115155606B - 一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法及其应用 - Google Patents
一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法及其应用 Download PDFInfo
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Abstract
本发明公开一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法及其应用,包括以下步骤:S1:处理玻璃衬底;S2:制备Bi2MoO6溶胶;S3:制备NiTiO3前驱体溶胶;S4:制备Bi2MoO6/NiTiO3异质结复合薄膜:S401:将S1处理后玻璃衬底置于Bi2MoO6溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;再重复该操作0‑4次,得到镀有Bi2MoO6薄膜的玻璃衬底;S402:将S401处理后玻璃衬底置于NiTiO3前驱体溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;再重复该操作0‑4次后,于550‑700℃恒温煅烧2h,冷却至25℃室温,即得。本发明利用溶胶‑凝胶法、提拉浸渍法、热处理在玻璃衬底镀上Bi2MoO6、NiTiO3薄膜,形成异质结光催化材料,改变电子的传递路径,使光生电子和空穴得到高效分离,提高光催化活性和稳定性。
Description
技术领域
本发明属于光催化材料领域,具体涉及一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法及其应用。
背景技术
随着工业化、城市化进程的加快,工业废水和生活污水的不合理排放,已对水体产生了严重的污染,但也会造成水中的各种污染物难以降解,对环境和人类都有很大的影响。因此,如何对水体进行有效的处理,以达到治理水体污染的目的,是目前国际上的一个重要课题。近几年,光催化技术已成为一种具有良好治理水体污染的新技术,备受国内外学者的重视。
Bi2MoO6是一种新的、具有光响应特性的光催化材料,已引起人们的广泛重视。Bi2MoO6是一种奥利维里斯层状结构,Bi2MoO6是Aurivillius系列中最简单的一种,它是一种倾斜的结构,该产品广泛应用于气体传感、离子导体、太阳能电池、光催化剂等领域。Bi2MoO6可以解决目前广泛使用的宽频光催化剂,可以在可见光环境中对有机物的污染进行降解,并具有良好的应用前景。目前,Bi2MoO6常见的制备方法:(1)溶剂热法:在10mL乙二醇中溶解3.373克硝酸铋,并在10mL乙二醇中溶解0.842g钼酸钠,搅拌均匀,然后加入40mL无水乙醇,搅拌均匀,置于聚四氟乙烯衬内的反应器内,在160℃下进行1h的反应,使反应器自然降温,然后进行清洗、干燥,然后在400℃的马弗炉中烘烤干燥的试样3h,得到Bi2MoO6;(2)水热法:通过高温、高压的水溶液,将一些不能溶于水的物质溶解,使其在一定程度上处于饱和状态,使其晶体生长;(3)高温固相法:指在较高的温度下,发生反应,形成结晶。比如羧酸盐都要在高温下进行,其固体的表面温度的范围要保持在1000℃-1500℃之间;(4)溶胶-凝胶法:铋源、钼酸盐在水或低碳醇溶剂中经溶液、溶胶、凝胶而固化。
在光催化方面,Bi2MoO6的研究取得了重大突破。Bi2MoO6是一种可以降解二氧化硫、一氧化碳等无机污染物的有效物质,甚至还能对某些有机物起到一定的作用。Bi2MoO6是一种常用的颜料,在环保、节能等方面实际应用中也有很好的效果,可用于办公家具、办公室装潢、玻璃等,能净化办公室的空气,抵御紫外线。但Bi2MoO6的禁带宽度为2.7-2.8eV,对可见光的响应光谱范围较窄,且Bi2MoO6在光激发作用下,产生的光生电子和光生空穴的复合效率较高,这些都限制了Bi2MoO6作为光催化剂对有机污染物的催化降解性能。
发明内容
针对现有技术的不足之处,本发明的目的在于提供一种Bi2MO6/NiTiO3异质结光催化薄膜材料的制备方法及其应用。
本发明的技术方案概述如下:
一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法,包括以下步骤:
S1:处理玻璃衬底:将玻璃衬底置于蒸馏水中,超声处理10min,干燥后,再置于丙酮中,超声处理10min,干燥后,再将玻璃衬底置于由蒸馏水、氨水、双氧水按5:1:1的体积比组成的混合溶液中,超声处理30min,取出玻璃衬底再用无水乙醇冲洗2-3min,干燥后,备用;
S2:制备Bi2MoO6溶胶:
S201:向乙二醇中加入硝酸铋,搅拌均匀,再加入钼酸钠,剧烈搅拌30min,得A溶液;
S202:将冰醋酸、蒸馏水加入无水乙醇中,搅拌均匀,得B溶液;
S203:25℃室温下,向A溶液中缓慢滴加B溶液,控制滴加时间为0.5h,再磁力搅拌反应2h,静置陈化24-72h,得到黄色溶胶,即为Bi2MoO6溶胶;
所述乙二醇、硝酸铋、钼酸钠、冰醋酸、蒸馏水、无水乙醇的用量比例为100mL:(7.5-12.5)mmol:(15-25)mmol:(25-30)mL:(2-4)mL:40mL;
S3:制备NiTiO3前驱体溶胶:25℃室温下,将硝酸镍、钛酸四丁酯、乙二胺四乙酸二钠加入乙二醇中,搅拌均匀后,再缓慢滴加2mol/L硝酸溶液至pH为2.0-3.0,再磁力搅拌反应2h,静置陈化24-72h,得到绿色溶胶,即为NiTiO3前驱体溶胶;
所述硝酸镍、钛酸四丁酯、乙二胺四乙酸二钠、乙二醇的用量比例为(15-25)mmol:(15-25)mmol:(0.5-1)g:100mL;
S4:制备Bi2MoO6/NiTiO3异质结复合薄膜:
S401:将S1处理后玻璃衬底置于Bi2MoO6溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;
再重复该操作0-4次,得到镀有Bi2MoO6薄膜的玻璃衬底;
S402:将S401处理后玻璃衬底置于NiTiO3前驱体溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;
再重复该操作0-4次后,于550-700℃恒温煅烧2h,冷却至25℃室温,即得玻璃基Bi2MoO6/NiTiO3异质结光催化薄膜材料。
优选的是,所述氨水的质量分数为25%。
优选的是,所述双氧水的质量分数为35%。
优选的是,所述乙二醇、硝酸铋、钼酸钠、冰醋酸、蒸馏水、无水乙醇的用量比例为100mL:10mmol:20mmol:27mL:3mL:40mL;
优选的是,所述硝酸镍、钛酸四丁酯、乙二胺四乙酸二钠、乙二醇的用量比例为20mmol:20mmol:0.8g:100mL;
优选的是,所述Bi2MoO6和NiTiO3的镀膜总层数为6层。
所述的制备方法制出的Bi2MoO6/NiTiO3异质结光催化薄膜材料在三芳基甲烷染料催化降解中的应用。
优选的是,所述三芳基甲烷染料包括罗丹明B、罗丹明123、罗丹明6G中的一种或多种。
本发明的有益效果:
1、本发明利用溶胶-凝胶法制出纳米Bi2MoO6溶胶、NiTiO3前驱体溶胶,再通过提拉浸渍法、热处理在玻璃衬底镀上Bi2MoO6、NiTiO3薄膜,形成异质结光催化薄膜材料,改变电子的传递路径,使光生电子和光生空穴在异质结界面沿不同方向转移,使光生电子和光生空穴得到高效分离,相比于单一相催化剂薄膜,有效提高薄膜材料的光催化活性和光催化稳定性。此外,NiTiO3禁带宽度为2.18eV,与纳米Bi2MoO6复合,提高了其对太阳光的吸收率和有效利用率,对可见光的吸收光谱更广,进而提高可见光光催化活性。
2、本发明采用溶胶-凝胶法制出纳米Bi2MoO6溶胶、NiTiO3前驱体溶胶,在后期热处理过程,膜层结构出现体积收缩,出现大量贯通的微孔结构或开孔结构,进而赋予Bi2MoO6/NiTiO3异质结光催化薄膜材料一定的吸附性能,同时,增大比表面积,提高异质结光催化薄膜与三芳基甲烷染料污染物的接触机率,提高催化降解效率,进而进一步提高其对三芳基甲烷染料的去除率。
3、本发明异质结光催化薄膜材料内层是具有奥利维里斯层状结构的Bi2MoO6,具有较大比表面积和良好的吸附性能,外层是具有菱方晶系钙钛矿结构的NiTiO3,Ni2+与12个氧配位,形成最密立方堆积,Ti原子和Ni原子间隔地排列在八面体配位的阳离子层,具有较高的结构稳定性,因而,利用不同晶体结构的Bi2MoO6、NiTiO3复合,使异质结光催化薄膜材料兼具良好的吸附性能、层间稳定性及可见光光催化活性等优点。
附图说明
图1为本发明Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法流程图。
具体实施方式
下面结合实施例对本发明做进一步的详细说明,以令本领域技术人员参照说明书文字能够据以实施。
本发明提供一实施例的Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法,包括以下步骤:
S1:处理玻璃衬底:将玻璃衬底置于蒸馏水中,超声处理10min,干燥后,再置于丙酮中,超声处理10min,干燥后,再将玻璃衬底置于由蒸馏水、质量分数为25%的氨水、质量分数为35%的双氧水按5:1:1的体积比组成的混合溶液中,超声处理30min,取出玻璃衬底再用无水乙醇冲洗2-3min,干燥后,备用;
S2:制备Bi2MoO6溶胶:
S201:向乙二醇中加入硝酸铋,搅拌均匀,再加入钼酸钠,剧烈搅拌30min,得A溶液;
S202:将冰醋酸、蒸馏水加入无水乙醇中,搅拌均匀,得B溶液;
S203:25℃室温下,向A溶液中缓慢滴加B溶液,控制滴加时间为0.5h,再磁力搅拌反应2h,静置陈化24-72h,得到黄色溶胶,即为Bi2MoO6溶胶;
所述乙二醇、硝酸铋、钼酸钠、冰醋酸、蒸馏水、无水乙醇的用量比例为100mL:(7.5-12.5)mmol:(15-25)mmol:(25-30)mL:(2-4)mL:40mL;
S3:制备NiTiO3前驱体溶胶:25℃室温下,将硝酸镍、钛酸四丁酯、乙二胺四乙酸二钠加入乙二醇中,搅拌均匀后,再缓慢滴加2mol/L硝酸溶液至pH为2.0-3.0,再磁力搅拌反应2h,静置陈化24-72h,得到绿色溶胶,即为NiTiO3前驱体溶胶;
所述硝酸镍、钛酸四丁酯、乙二胺四乙酸二钠、乙二醇的用量比例为(15-25)mmol:(15-25)mmol:(0.5-1)g:100mL;
S4:制备Bi2MoO6/NiTiO3异质结复合薄膜:
S401:将S1处理后玻璃衬底置于Bi2MoO6溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;
再重复该操作0-4次,得到镀有Bi2MoO6薄膜的玻璃衬底;
S402:将S401处理后玻璃衬底置于NiTiO3前驱体溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;
再重复该操作0-4次并控制Bi2MoO6和NiTiO3的镀膜总层数为6层,于550-700℃恒温煅烧2h,冷却至25℃室温,即得玻璃基Bi2MoO6/NiTiO3异质结光催化薄膜材料。
该实施例制出的Bi2MoO6/NiTiO3异质结光催化薄膜材料在三芳基甲烷染料催化降解中的应用;所述三芳基甲烷染料包括罗丹明B、罗丹明123、罗丹明6G中的一种或多种。
该实施例利用溶胶-凝胶法制出纳米Bi2MoO6溶胶、NiTiO3前驱体溶胶,再通过提拉浸渍法、热处理在玻璃衬底镀上Bi2MoO6、NiTiO3薄膜,形成异质结光催化薄膜材料,改变电子的传递路径,使光生电子和光生空穴在异质结界面沿不同方向转移,使光生电子和光生空穴得到高效分离,相比于单一相催化剂薄膜,有效提高薄膜材料的光催化活性和光催化稳定性。此外,NiTiO3禁带宽度为2.18eV,与纳米Bi2MoO6复合,提高了其对太阳光的吸收率和有效利用率,对可见光的吸收光谱更广,进而提高可见光光催化活性。
该实施例采用溶胶-凝胶法制出纳米Bi2MoO6溶胶、NiTiO3前驱体溶胶,在后期热处理过程,膜层结构出现体积收缩,出现大量贯通的微孔结构或开孔结构,进而赋予Bi2MO6/NiTiO3异质结光催化薄膜材料一定的吸附性能,同时,增大比表面积,提高异质结光催化薄膜与三芳基甲烷染料污染物的接触机率,提高催化降解效率,进而进一步提高其对三芳基甲烷染料的去除率。
该实施例异质结光催化薄膜材料内层是具有奥利维里斯层状结构的Bi2MoO6,具有较大比表面积和良好的吸附性能,外层是具有菱方晶系钙钛矿结构的NiTiO3,Ni2+与12个氧配位,形成最密立方堆积,Ti原子和Ni原子间隔地排列在八面体配位的阳离子层,具有较高的结构稳定性,因而,利用不同晶体结构的Bi2MoO6、NiTiO3复合,使异质结光催化薄膜材料兼具良好的吸附性能、层间稳定性及可见光光催化活性等优点。
实施例1
一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法,包括以下步骤:
S1:处理玻璃衬底:将规格为5cm×5cm玻璃衬底置于蒸馏水中,超声处理10min,干燥后,再置于丙酮中,超声处理10min,干燥后,再将玻璃衬底置于由蒸馏水、质量分数为25%的氨水、质量分数为35%的双氧水按5:1:1的体积比组成的混合溶液中,超声处理30min,取出玻璃衬底再用无水乙醇冲洗2-3min,干燥后,备用;
S2:制备Bi2MoO6溶胶:
S201:向100mL乙二醇中加入7.5mmol硝酸铋,搅拌均匀,再加入15mmol钼酸钠,剧烈搅拌30min,得A溶液;
S202:将25mL冰醋酸、2mL蒸馏水加入40mL无水乙醇中,搅拌均匀,得B溶液;
S203:25℃室温下,向A溶液中缓慢滴加B溶液,控制滴加时间为0.5h,再磁力搅拌反应2h,静置陈化48h,得到黄色溶胶,即为Bi2MoO6溶胶;
S3:制备NiTiO3前驱体溶胶:25℃室温下,将15mmol硝酸镍、15mmol钛酸四丁酯、0.5g乙二胺四乙酸二钠加入100mL乙二醇中,搅拌均匀后,再缓慢滴加2mol/L硝酸溶液至pH为2.0,再磁力搅拌反应2h,静置陈化48h,得到绿色溶胶,即为NiTiO3前驱体溶胶;
S4:制备Bi2MoO6/NiTiO3异质结复合薄膜:
S401:将S1处理后玻璃衬底置于Bi2MoO6溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;
再重复该操作4次,得到镀有5层Bi2MoO6薄膜的玻璃衬底;
S402:将S401处理后玻璃衬底置于NiTiO3前驱体溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min后,于550℃恒温煅烧2h,冷却至25℃室温,即得玻璃基5Bi2MoO6/1NiTiO3异质结光催化薄膜材料。
实施例2
一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法,包括以下步骤:
S1:处理玻璃衬底:将规格为5cm×5cm玻璃衬底置于蒸馏水中,超声处理10min,干燥后,再置于丙酮中,超声处理10min,干燥后,再将玻璃衬底置于由蒸馏水、质量分数为25%的氨水、质量分数为35%的双氧水按5:1:1的体积比组成的混合溶液中,超声处理30min,取出玻璃衬底再用无水乙醇冲洗2.5min,干燥后,备用;
S2:制备Bi2MoO6溶胶:
S201:向100mL乙二醇中加入9mmol硝酸铋,搅拌均匀,再加入18mmol钼酸钠,剧烈搅拌30min,得A溶液;
S202:将26mL冰醋酸、4mL蒸馏水加入40mL无水乙醇中,搅拌均匀,得B溶液;
S203:25℃室温下,向A溶液中缓慢滴加B溶液,控制滴加时间为0.5h,再磁力搅拌反应2h,静置陈化48h,得到黄色溶胶,即为Bi2MoO6溶胶;
S3:制备NiTiO3前驱体溶胶:25℃室温下,将18mmol硝酸镍、18mmol钛酸四丁酯、0.75g乙二胺四乙酸二钠加入100mL乙二醇中,搅拌均匀后,再缓慢滴加2mol/L硝酸溶液至pH为2.5,再磁力搅拌反应2h,静置陈化48h,得到绿色溶胶,即为NiTiO3前驱体溶胶;
S4:制备Bi2MoO6/NiTiO3异质结复合薄膜:
S401:将S1处理后玻璃衬底置于Bi2MoO6溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;
再重复该操作3次,得到镀有4层Bi2MoO6薄膜的玻璃衬底;
S402:将S401处理后玻璃衬底置于NiTiO3前驱体溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;
再重复该操作1次后,于600℃恒温煅烧2h,冷却至25℃室温,即得玻璃基4Bi2MoO6/2NiTiO3异质结光催化薄膜材料。
实施例3
一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法,包括以下步骤:
S1:处理玻璃衬底:将规格为5cm×5cm玻璃衬底置于蒸馏水中,超声处理10min,干燥后,再置于丙酮中,超声处理10min,干燥后,再将玻璃衬底置于由蒸馏水、质量分数为25%的氨水、质量分数为35%的双氧水按5:1:1的体积比组成的混合溶液中,超声处理30min,取出玻璃衬底再用无水乙醇冲洗2.5min,干燥后,备用;
S2:制备Bi2MoO6溶胶:
S201:向100mL乙二醇中加入10mmol硝酸铋,搅拌均匀,再加入20mmol钼酸钠,剧烈搅拌30min,得A溶液;
S202:将27mL冰醋酸、3mL蒸馏水加入40mL无水乙醇中,搅拌均匀,得B溶液;
S203:25℃室温下,向A溶液中缓慢滴加B溶液,控制滴加时间为0.5h,再磁力搅拌反应2h,静置陈化72h,得到黄色溶胶,即为Bi2MoO6溶胶;
S3:制备NiTiO3前驱体溶胶:25℃室温下,将20mmol硝酸镍、20mmol钛酸四丁酯、0.8g乙二胺四乙酸二钠加入100mL乙二醇中,搅拌均匀后,再缓慢滴加2mol/L硝酸溶液至pH为2.5,再磁力搅拌反应2h,静置陈化72h,得到绿色溶胶,即为NiTiO3前驱体溶胶;
S4:制备Bi2MoO6/NiTiO3异质结复合薄膜:
S401:将S1处理后玻璃衬底置于Bi2MoO6溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;
再重复该操作2次,得到镀有3层Bi2MoO6薄膜的玻璃衬底;
S402:将S401处理后玻璃衬底置于NiTiO3前驱体溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;
再重复该操作2次后,于650℃恒温煅烧2h,冷却至25℃室温,即得玻璃基3Bi2MoO6/3NiTiO3异质结光催化薄膜材料。
实施例4
一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法,包括以下步骤:
S1:处理玻璃衬底:将规格为5cm×5cm玻璃衬底置于蒸馏水中,超声处理10min,干燥后,再置于丙酮中,超声处理10min,干燥后,再将玻璃衬底置于由蒸馏水、质量分数为25%的氨水、质量分数为35%的双氧水按5:1:1的体积比组成的混合溶液中,超声处理30min,取出玻璃衬底再用无水乙醇冲洗2-3min,干燥后,备用;
S2:制备Bi2MoO6溶胶:
S201:向100mL乙二醇中加入11mmol硝酸铋,搅拌均匀,再加入22mmol钼酸钠,剧烈搅拌30min,得A溶液;
S202:将28mL冰醋酸、3mL蒸馏水加入40mL无水乙醇中,搅拌均匀,得B溶液;
S203:25℃室温下,向A溶液中缓慢滴加B溶液,控制滴加时间为0.5h,再磁力搅拌反应2h,静置陈化72h,得到黄色溶胶,即为Bi2MoO6溶胶;
S3:制备NiTiO3前驱体溶胶:25℃室温下,将22.5mmol硝酸镍、22.5mmol钛酸四丁酯、0.9g乙二胺四乙酸二钠加入100mL乙二醇中,搅拌均匀后,再缓慢滴加2mol/L硝酸溶液至pH为2.5,再磁力搅拌反应2h,静置陈化72h,得到绿色溶胶,即为NiTiO3前驱体溶胶;
S4:制备Bi2MoO6/NiTiO3异质结复合薄膜:
S401:将S1处理后玻璃衬底置于Bi2MoO6溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;
再重复该操作1次,得到镀有Bi2MoO6薄膜的玻璃衬底;
S402:将S401处理后玻璃衬底置于NiTiO3前驱体溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;
再重复该操作3次后,于700℃恒温煅烧2h,冷却至25℃室温,即得玻璃基2Bi2MoO6/4NiTiO3异质结光催化薄膜材料。
实施例5
一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法,包括以下步骤:
S1:处理玻璃衬底:将规格为5cm×5cm玻璃衬底置于蒸馏水中,超声处理10min,干燥后,再置于丙酮中,超声处理10min,干燥后,再将玻璃衬底置于由蒸馏水、质量分数为25%的氨水、质量分数为35%的双氧水按5:1:1的体积比组成的混合溶液中,超声处理30min,取出玻璃衬底再用无水乙醇冲洗3min,干燥后,备用;
S2:制备Bi2MoO6溶胶:
S201:向100mL乙二醇中加入12.5mmol硝酸铋,搅拌均匀,再加入25mmol钼酸钠,剧烈搅拌30min,得A溶液;
S202:将30mL冰醋酸、3mL蒸馏水加入40mL无水乙醇中,搅拌均匀,得B溶液;
S203:25℃室温下,向A溶液中缓慢滴加B溶液,控制滴加时间为0.5h,再磁力搅拌反应2h,静置陈化24h,得到黄色溶胶,即为Bi2MoO6溶胶;
S3:制备NiTiO3前驱体溶胶:25℃室温下,将25mmol硝酸镍、25mmol钛酸四丁酯、1g乙二胺四乙酸二钠加入100mL乙二醇中,搅拌均匀后,再缓慢滴加2mol/L硝酸溶液至pH为3.0,再磁力搅拌反应2h,静置陈化24h,得到绿色溶胶,即为NiTiO3前驱体溶胶;
S4:制备Bi2MoO6/NiTiO3异质结复合薄膜:
S401:将S1处理后玻璃衬底置于Bi2MoO6溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min,得到镀有1层Bi2MoO6薄膜的玻璃衬底;
S402:将S401处理后玻璃衬底置于NiTiO3前驱体溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;
再重复该操作4次后,于700℃恒温煅烧2h,冷却至25℃室温,即得玻璃基1Bi2MoO6/5NiTiO3异质结光催化薄膜材料。
对比例1与实施例1相同,区别在于:制备产物为玻璃基6Bi2MoO6光催化薄膜材料;
S1处理玻璃衬底、S2制备Bi2MoO6溶胶同实施例1;
S3:将S1处理后玻璃衬底置于Bi2MoO6溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;再重复该操作5次,于550℃恒温煅烧2h,冷却至25℃室温,即得玻璃基6Bi2MoO6光催化薄膜材料。
对比例2与实施例5相同,区别在于:制备产物为玻璃基6NiTiO3光催化薄膜材料;
S1:处理玻璃衬底:同实施例5;
S2:制备NiTiO3前驱体溶胶:同实施例5;
S3:将S1处理后玻璃衬底置于NiTiO3前驱体溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;再重复该操作5次后,于700℃恒温煅烧2h,冷却至25℃室温,即得玻璃基6NiTiO3光催化薄膜材料。
对实施例1-5及对比例1-2制出的光催化薄膜材料进行光降解率测定:
量筒测量100mL的50mg/L罗丹明B溶液,放入准备好的培养皿中,使镀有光催化薄膜的玻璃充分浸泡在培养皿的溶液中,首先在黑暗环境下静置处理30min,再打开500W氙灯光源,并用可见光滤光片使得420nm以上的可见光通过,并将培养皿置于距离光源5cm处,进行光催化反应。在光照处理第10min、20min、40min、60min、90min、100min,分别取样,用紫外可见分光光度计测量在波长为554nm时的吸收情况,并用吸收度来计算光降解率,其计算公式为:
式中:A0为光照前溶液的吸光度;A为光照t时刻的吸光度。
下表列出实施例1-5及对比例1-2制出的光催化薄膜材料的光降解率试验结果:
由上表可知,实施例1-5在Bi2MoO6和NiTiO3的界面上形成了高效的交错异质结,可以有效地促进光生载流子的分离,从而改善了Bi2MoO6/NiTiO3复合体的光催化性能,相比于Bi2MoO6、NiTiO3纯相,光催化降解性能被大大提升,其中,实施例3制出的3Bi2MoO6/3NiTiO3异质结光催化薄膜材料的可见光催化性能最优,在第100min,对罗丹明B的降解率达到96.04%;此外,NiTiO3纳米光纤的光投射特性较好,而Bi2MoO6纳米纤维的光散射特性较好,在光入射时,使入射光在Bi2MoO6、NiTiO3界层间发生反射、散射,使NiTiO3能捕捉并利用这部分可见光,实现可见光的最大化利用,进而提高光催化效率。
尽管本发明的实施方案已公开如上,但其并不仅仅限于说明书和实施方式中所列运用,它完全可以被适用于各种适合本发明的领域,对于熟悉本领域的人员而言,可容易地实现另外的修改,因此在不背离权利要求及等同范围所限定的一般概念下,本发明并不限于特定的细节。
Claims (8)
1.一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法,其特征在于,包括以下步骤:
S1:处理玻璃衬底:将玻璃衬底置于蒸馏水中,超声处理10min,干燥后,再置于丙酮中,超声处理10min,干燥后,再将玻璃衬底置于由蒸馏水、氨水、双氧水按5:1:1的体积比组成的混合溶液中,超声处理30min,取出玻璃衬底再用无水乙醇冲洗2-3min,干燥后,备用;
S2:制备Bi2MoO6溶胶:
S201:向乙二醇中加入硝酸铋,搅拌均匀,再加入钼酸钠,剧烈搅拌30min,得A溶液;
S202:将冰醋酸、蒸馏水加入无水乙醇中,搅拌均匀,得B溶液;
S203:25℃室温下,向A溶液中缓慢滴加B溶液,控制滴加时间为0.5h,再磁力搅拌反应2h,静置陈化24-72h,得到黄色溶胶,即为Bi2MoO6溶胶;
所述乙二醇、硝酸铋、钼酸钠、冰醋酸、蒸馏水、无水乙醇的用量比例为100mL:(7.5-12.5)mmol:(15-25)mmol:(25-30)mL:(2-4)mL:40mL;
S3:制备NiTiO3前驱体溶胶:25℃室温下,将硝酸镍、钛酸四丁酯、乙二胺四乙酸二钠加入乙二醇中,搅拌均匀后,再缓慢滴加2mol/L硝酸溶液至pH为2.0-3.0,再磁力搅拌反应2h,静置陈化24-72h,得到绿色溶胶,即为NiTiO3前驱体溶胶;
所述硝酸镍、钛酸四丁酯、乙二胺四乙酸二钠、乙二醇的用量比例为(15-25)mmol:(15-25)mmol:(0.5-1)g:100mL;
S4:制备Bi2MoO6/NiTiO3异质结复合薄膜:
S401:将S1处理后玻璃衬底置于Bi2MoO6溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;
再重复该操作0-4次,得到镀有Bi2MoO6薄膜的玻璃衬底;
S402:将S401处理后玻璃衬底置于NiTiO3前驱体溶胶中浸渍10min,再以1mm/s的提拉速度缓慢将其取出液面,80℃干燥10min;
再重复该操作0-4次后,于550-700℃恒温煅烧2h,冷却至25℃室温,即得玻璃基Bi2MoO6/NiTiO3异质结光催化薄膜材料。
2.根据权利要求1所述一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法,其特征在于,所述氨水的质量分数为25%。
3.根据权利要求1所述一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法,其特征在于,所述双氧水的质量分数为35%。
4.根据权利要求1所述一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法,其特征在于,所述乙二醇、硝酸铋、钼酸钠、冰醋酸、蒸馏水、无水乙醇的用量比例为100mL:10mmol:20mmol:27mL:3mL:40mL。
5.根据权利要求1所述一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法,其特征在于,所述硝酸镍、钛酸四丁酯、乙二胺四乙酸二钠、乙二醇的用量比例为20mmol:20mmol:0.8g:100mL。
6.根据权利要求1所述一种Bi2MoO6/NiTiO3异质结光催化薄膜材料的制备方法,其特征在于,所述Bi2MoO6和NiTiO3的镀膜总层数为6层。
7.一种根据权利要求1-6任一项所述的制备方法制出的Bi2MoO6/NiTiO3异质结光催化薄膜材料在三芳基甲烷染料催化降解中的应用。
8.根据权利要求7所述的应用,其特征在于,所述三芳基甲烷染料包括罗丹明B、罗丹明123、罗丹明6G中的一种或多种。
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