CN110624565A - 一种硫化镉(CdS)掺杂钒酸铋(BiVO4)复合光催化剂的制备方法 - Google Patents
一种硫化镉(CdS)掺杂钒酸铋(BiVO4)复合光催化剂的制备方法 Download PDFInfo
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Abstract
本发明涉及一种硫化镉(CdS)掺杂钒酸铋(BiVO4)复合光催化剂的制备,包括步骤:CdS纳米棒的制备和硫化镉(CdS)掺杂钒酸铋(BiVO4)复合光催化剂的制备。本发明的有益效果是:该制备方法较为简单,制备条件容易控制,所制备的棒状硫化镉(CdS)掺杂钒酸铋(BiVO4)复合光催化剂具有无二次污染,光催化效率高等优点,具有一定的应用价值。
Description
技术领域
本发明属于纳米材料制备及应用技术领域,涉及一种硫化镉(CdS)掺杂钒酸铋(BiVO4)复合光催化剂的制备方法。
背景技术
在人类工业文明不断发展的现代社会,环境恶化和能源短缺已成为工业文明持续发展的重大挑战。随着科技的发展,人们发现光催化技术在处理水污染,产氢等领域显示出众多优势,因此,半导体光催化技术的出现,一定程度上给解决难题带来希望,也被认为是缓解环境恶化和能源短缺领域最具前景的技术。
Z-方式异质结由两个以上的半导体组成,可以促进电荷载体的空间分离,并在两侧分别进行还原和氧化反应,Z-方式异质结中的两个组分中,硫化镉(CdS)是最有希望的候选物之一,因为合适的带隙(2.25eV)和理想的CB位置用于H2产生和光捕获,由于CdS和BiVO4之间具有合适的带隙和带隙电位,因此可以预期BiVO4的CB上的光生电子可以快速地与CdS的VB上的光生空穴重新组合,实现新的Z-方式异质结,CdS / BiVO4复合光催化剂有益于光生电荷的分离。
在这里,我们展示了一种新的Z-方案异质结光催化剂,由两个可见光响应半导体组成,不使用电子介体,所制备的CdS纳米棒掺杂BiVO4纳米短棒(CdS / BiVO4)表现出更宽的光吸收区域和Z-方向电荷分离机制,用于在可见光下染料降解。
发明内容
本发明要解决的技术问题是:基于上述问题,本发明提供一种硫化镉(CdS)掺杂钒酸铋(BiVO4)复合光催化剂的制备方法。
本发明解决其技术问题所采用的一个技术方案是:一种硫化镉(CdS)掺杂钒酸铋(BiVO4)复合光催化剂的制备方法,包括以下步骤:
(1)CdS纳米棒的制备:采用简单的溶剂热法合成CdS纳米棒,步骤如下:将4.66 g Cd(NO3)2·4H2O与3.45 g硫脲同时溶于70 mL乙二胺中,在室温下搅拌30 min,然后将混合物转移到聚四氟乙烯内衬不锈钢高压釜中,在160 ℃下持续反应,当反应釜冷却至室温后,用去离子水和无水乙醇反复洗涤所得产物,并在60 ℃下干燥8 h。
(2)硫化镉(CdS)/钒酸铋(BiVO4)复合光催化剂的制备:通过简单的水热法合成,步骤如下:准确称取制备好的CdS加入到70mL去离子水中,超声30min,加入Bi(NO3)3·5H2O,搅拌30min,加入NH4VO3,调节pH为6,搅拌30min,混合物转移到聚四氟乙烯不锈钢高压釜中,在160℃下持续反应12 h,最后,离心分离,用水和乙醇依次清洗,所得产物60 ℃下干燥24小时。
进一步地,所述的步骤(1)CdS纳米棒的水热反应为160℃,反应时间为24 h;
进一步地,所述的步骤(2)中Bi(NO3)3·5H2O和NH4VO3的摩尔比为1:1;
进一步地,所述的步骤(2)中CdS纳米棒的质量为0.1 g,且BiVO4:CdS质量比分别为20wt%、30 wt%、40 wt%;
硫化镉(CdS)/钒酸铋(BiVO4)复合光催化剂的应用,用于光催化降解孔雀石绿(MG)溶液,按照下述步骤进行:
称取20 mg催化剂放入试管中,加入50 mL 20mg/L MG溶液,用带有420 nm滤光片的500W氙灯作为光源,进行光催化降解反应。暗反应时间为1 h,光照后,每10 min取次样,进行离心,进而测其吸光度。
本发明的有益效果是:该制备方法较为简单,制备条件容易控制,所制备的硫化镉(CdS)/钒酸铋(BiVO4)复合光催化剂具有无污染,催化效率高等优点,具有一定的应用价值。附图说明
下面结合附图对本发明进一步说明。
图1是本发明实施例1制备得到的硫化镉(CdS)/钒酸铋(BiVO4)复合光催化剂的扫描电镜图;
图2是本发明实施例1制备得到的硫化镉(CdS)/钒酸铋(BiVO4)复合光催化剂的X射线衍射图;
图3是本发明实施例1制备得到的硫化镉(CdS)/钒酸铋(BiVO4)复合光催化剂降解孔雀石绿(MG)的活性图。
具体实施方式
现在结合具体实施例对本发明作进一步说明,以下实施例旨在说明本发明而不是对本发明的进一步限定。
实施例1
(1)CdS纳米棒的制备:采用简单的溶剂热法合成CdS纳米棒,步骤如下:将4.66 g Cd(NO3)2·4H2O与3.45 g硫脲同时溶于70 mL乙二胺中,在室温下搅拌30 min,然后将混合物转移到聚四氟乙烯内衬不锈钢高压釜中,在160 ℃下持续反应,当反应釜冷却至室温后,用去离子水和无水乙醇反复洗涤所得产物,并在60 ℃下干燥8 h。
(2)硫化镉(CdS)/钒酸铋(BiVO4)复合光催化剂的制备:通过简单的水热法合成,步骤如下:准确称取制备好的CdS加入到70mL去离子水中,超声30min,加入Bi(NO3)3·5H2O,搅拌30min,加入NH4VO3,调节pH为6,搅拌30min,混合物转移到聚四氟乙烯不锈钢高压釜中,在160℃下持续反应12 h,最后,离心分离,用水和乙醇依次清洗,所得产物60 ℃下干燥24小时。
扫描电镜图如图1所示,从图可以看出,本实施方式制备的硫化镉(CdS)掺杂碘氧化铋(BiOI)复合光催化剂的形貌为碘氧化铋微板表面包覆棒状CdS,且分布较为均匀。
X射线衍射图谱如图2所示,由图可知,制备的硫化镉(CdS)掺杂钒酸铋(BiVO4)复合光催化剂XRD衍射图中可看到在24.81˚,26.51˚,28.18˚,36.62˚和43.68˚是CdS的特征衍射峰。BiVO4可以指定为单斜相(JCPDS No. 14-0688)具有良好的结晶度。因此,可以证明CdS与BiOI复合在一起,并且未改变自身晶型,这与电镜的结果一致。
(4)光催化降解孔雀石绿(MG)
分别称取20 mg不同催化剂放入试管中,加入50 mL 20mg/L孔雀石绿(MG)溶液,用带有420 nm滤光片的500 W氙灯作为光源,进行光催化降解反应。暗反应时间为1 h ,光照以后,每隔10 min取次样,并在5000 rpm 条件下高速离心,取上层清液用紫外可见分光光度计测其浓度变化。由图3可见,在50分钟内甲基蓝降解率以达到94%,可见所制备的CdS@ BiVO4复合光催化剂具有较高的光催化活性。
Claims (4)
1.硫化镉(CdS)掺杂钒酸铋(BiVO4)复合光催化剂的制备方法,其特征在于,包括以下步骤:
(1)CdS纳米棒的制备:采用简单的溶剂热法合成CdS纳米棒,步骤如下:将4.66 g Cd(NO3)2·4H2O与3.45 g硫脲同时溶于70 mL乙二胺中,在室温下搅拌30 min,然后将混合物转移到聚四氟乙烯内衬不锈钢高压釜中,在160 ℃下持续反应,当反应釜冷却至室温后,用去离子水和无水乙醇反复洗涤所得产物,并在60 ℃下干燥8 h;
(2)硫化镉(CdS)/钒酸铋(BiVO4)复合光催化剂的制备:通过简单的水热法合成,步骤如下:准确称取制备好的CdS加入到70mL去离子水中,超声30min,加入Bi(NO3)3·5H2O,搅拌30min,加入NH4VO3,调节pH为6,搅拌30min,混合物转移到聚四氟乙烯不锈钢高压釜中,在160℃下持续反应12 h,最后,离心分离,用水和乙醇依次清洗,所得产物60 ℃下干燥24小时。
2.根据权利要求1所述的一种硫化镉(CdS)掺杂钒酸铋(BiVO4)复合光催化剂的制备方法,其特征是:所述的步骤(1)CdS纳米棒的水热反应为160℃,反应时间为24 h。
3.根据权利要求1所述的一种硫化镉(CdS)掺杂钒酸铋(BiVO4)复合光催化剂的制备方法,其特征是:所述的步骤(2)中 Bi(NO3)3·5H2O和NH4VO3的摩尔比为1:1。
4.根据权利要求1所述的一种硫化镉(CdS)掺杂钒酸铋(BiVO4)复合光催化剂的制备方法,其特征是:所述的步骤(2)中CdS纳米棒的质量为0.1 g,且BiVO4:CdS质量比分别为20wt%、30 wt%、40 wt%。
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