CN112108162B - 一种0d/2d复合纳米材料及其制备方法和应用 - Google Patents
一种0d/2d复合纳米材料及其制备方法和应用 Download PDFInfo
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Abstract
本发明公开一种0D/2D复合纳米材料及其制备方法和应用,所述复合纳米材料包括Bi2WO6纳米片和位于Bi2WO6纳米片晶格内的Cs3Bi2I9纳米颗粒。本发明的Cs3Bi2I9纳米颗粒生长在Bi2WO6纳米片晶格中,可与Bi2WO6共享Bi原子。Bi原子的共享为Bi2WO6和Cs3Bi2I9两种半导体之间的电子传输提供了一个桥梁的作用,可降低半导体自身的光生电子和空穴的复合速率,从而提升光催化性能。
Description
技术领域
本发明属于钙钛矿材料技术领域,尤其涉及一种0D/2D复合纳米材料及其制备方法和应用。
背景技术
半导体材料通常包括过渡态金属的氧化物、硫化物、碳化物等物质,其导电能力介于导体和绝缘体之间,可用来制作半导体器件和集成电路的电子材料。在通常情况下,半导体的电导率随温度的升高而随之升高,这一点恰恰与金属导体相反。
金属卤化钙钛矿是一种刚刚兴起的半导体材料。近些年来,铅基卤化钙钛矿由于具有优异的光学性质(如:载流子寿命长、吸收可拓宽至可见光区、双极性电荷传输、能级易剪裁等诸多优点)而被广泛关注。然而,铅基卤化钙钛矿含有剧毒的铅,过度摄入会破坏人体的内分泌系统甚至是损害人生命健康,因此铅基卤化钙钛矿的商业应用受到较大的限制。因此,寻找一种能够等效代替铅的金属钙钛矿材料极为重要。
Bi2WO6作为一种新型的半导体材料,具有钙钛矿层状结构,具有良好的紫外和可见光响应的光催化性能。然而Bi2WO6的光吸收范围较窄,而且其光生载流子(光生电子和空穴)复合的几率较高,限制了其实际应用。针对Bi2WO6存在的缺陷,较多研究者通过构建复合材料的途径来改善Bi2WO6的光吸收性能和催化性能。如CN105833860A将碳量子点和Bi2WO6纳米片复合,CN105457663A在Bi2WO6纳米片表面生长纳米Ag3PO4。虽然相较单独的Bi2WO6,复合材料的性能有所改善,但CN105833860A的复合材料的光吸收范围在450nm以下,CN105457663A复合材料的光吸收范围在500nm以下,光谱响应范围较窄,将影响催化性能的提高。
发明内容
本发明旨在至少解决现有技术中存在的技术问题之一。为此,本发明的第一个目的是提出一种0D/2D复合纳米材料(以下称复合纳米材料),具有良好的光催化性能。
本发明的第二个目的是提供所述复合纳米材料的制备方法。
本发明的第三个目的是提供所述复合纳米材料的应用,具体为复合纳米材料在光催化还原二氧化碳中的应用。
本发明采取的技术方案如下:
一种复合纳米材料,包括Bi2WO6纳米片和位于Bi2WO6纳米片晶格内的Cs3Bi2I9纳米颗粒。
相对于现有技术,本发明的Cs3Bi2I9纳米颗粒生长在Bi2WO6纳米片晶格中,可与Bi2WO6共享Bi原子。Bi原子的共享为Bi2WO6和Cs3Bi2I9两种半导体之间的电子传输提供了一个桥梁的作用,可降低半导体自身的光生电子和空穴的复合速率,从而提升光催化性能。
所述复合纳米材料中,Bi2WO6纳米片和Cs3Bi2I9纳米颗粒共享Bi原子。
所述复合纳米材料中,Bi2WO6纳米片具有(001)晶面。当Bi2WO6沿着(001)晶面生长时,能够暴露出更多的配位不饱和的Bi原子,从而可在配位不饱和的Bi原子基础上原位形成Cs3Bi2I9,使Bi2WO6和Cs3Bi2I9共享Bi原子。
所述Cs3Bi2I9纳米颗粒粒径为5~10nm。
所述复合纳米材料的横向尺寸为30~100nm。
一种复合纳米材料的制备方法,包括如下步骤:将具有配位不饱和Bi原子的Bi2WO6纳米片与CsI在液相中混合,反应得到复合纳米材料。
具体地,所述复合纳米材料的制备方法包括如下步骤:
(1)制备具有配位不饱和Bi原子的Bi2WO6纳米片;
(2)将步骤(1)所制Bi2WO6纳米片与CsI溶液混合,反应得到复合纳米材料。
步骤(1)中,制备具有配位不饱和Bi原子的Bi2WO6纳米片的方法为:将Bi(NO3)3水溶液、Na2WO4水溶液和KI水溶液混合,反应得到具有配位不饱和Bi原子的Bi2WO6纳米片。
本发明的Bi2WO6在水溶液中制备而成。在水环境下,Bi2WO6纳米片更倾向于沿着(001)晶面生长,能够暴露出更多的配位不饱和的Bi原子。而且使用水作为溶剂还可省去对体系pH进行调节的操作,成本低廉、操作简单。同时由于表面暴露的配位不饱和的Bi原子会吸附在Bi2WO6表面,导致Bi2WO6纳米片发生聚集。因此本申请加入KI使表面暴露的配位不饱和的Bi原子表面形成负电荷,避免Bi2WO6纳米片发生聚集。
制备具有配位不饱和Bi原子的Bi2WO6纳米片过程中,反应温度为100~160℃,反应时间为16~30h。反应结束后进行固液分离,收集固体即为所需Bi2WO6纳米片。
所述Bi(NO3)3、Na2WO4、KI和步骤(2)中CsI的摩尔比为(0.5~2.5):(0.25~1.25):(0.025~0.125):(0.006~0.031)。
Bi(NO3)3水溶液浓度为0.05~0.1mol/mL。
Na2WO4水溶液浓度为0.025~0.05mol/mL。
KI水溶液浓度为0.0025~0.005mol/mL。
CsI溶液浓度为5~10mol/L。
步骤(2)中,所述反应温度为40~70℃,反应时间为1~7h。
步骤(2)中,Bi2WO6纳米片以Bi2WO6分散液形式与CsI溶液混合。Bi2WO6分散液和CsI溶液的溶剂均为极性溶剂,所述极性溶剂选自乙腈、乙醇中的至少一种。
步骤(2)中,所述反应结束后进行固液分离,收集固体、干燥,即得复合纳米材料。所述固液分离方法采用离心,离心转速为1000~6000rpm,离心时间为3~10min。所述干燥在50~70℃下进行,干燥时间为3~7h。
一种催化还原CO2的方法,包括如下步骤:以CO2为原料,以上述复合纳米材料为催化剂,在气固体系下进行光催化CO2还原实验,得到的产物为CO。
所述光照的波长λ≥400nm。
气固体系中CO2浓度为过渡饱和,所使用催化剂的质量为3mg。
相对于现有技术,本发明具有如下有益效果:
(1)本发明巧妙地利用了Bi2WO6表面暴露的且配位不饱和的Bi原子原位生长了Cs3Bi2I9钙钛矿量子点,降低了光生电子和空穴的复合速率,提高了光催化性能。
(2)本发明的复合纳米材料不含铅,安全性高。
(3)制备方法简单、反应条件温和、价格低廉。
附图说明
图1为Bi2WO6纳米片的XRD图。
图2为Cs3Bi2I9/Bi2WO6纳米片的紫外谱图。
图3为Bi2WO6纳米片的TEM图。
图4为Cs3Bi2I9/Bi2WO6的XRD图。
图5为Cs3Bi2I9/Bi2WO6的紫外光谱图。
图6为Cs3Bi2I9/Bi2WO6的TEM图。
图7为Cs3Bi2I9/Bi2WO6的XPS图谱。
图8为Cs3Bi2I9/Bi2WO6用于光催化CO2还原制备CO的效果测试图。
具体实施方式
以下结合具体的实施例进一步说明本发明的技术方案。
本发明提供一种复合纳米材料,其制备方法包括如下步骤:
1)将Bi(NO3)3·5H2O分散到超纯水中,形成浓度为0.05mol/mL的溶液A;
2)将Na2WO4·2H2O分散到超纯水中,形成溶液为0.025mol/mL的溶液B;
3)将KI分散到超纯水中,形成浓度为0.0025mol/mL溶液C;
4)将20mL溶液A在搅拌之下滴入等体积溶液B,加完之后快速搅拌30min,再加入等体积溶液C,加完之后搅拌反应1h,再进行离心,将离心得到的固体置于60℃下干燥5h,得到超薄的Bi2WO6纳米片。
5)将步骤4)所得所有Bi2WO6纳米片分散到乙腈中,形成悬浊液A1;
6)将CsI溶于乙腈中,配制CsI浓度为5mol/L的溶液B1;
7)将10mL悬浊液A1加热并保持在60℃,再边搅拌边滴加等体积的溶液B1,加完后搅拌5h,再进行离心(离心机转速为6000rpm,离心时间为10min),将离心得到的固体置于60℃下烘干5h,得到复合纳米材料(标记为Cs3Bi2I9/Bi2WO6)。
结构表征:
对步骤4)制得的Bi2WO6纳米片和步骤7)所得Cs3Bi2I9/Bi2WO6进行结构表征,结果如下:
1)Bi2WO6纳米片
Bi2WO6纳米片的XRD图如图1所示。由图1可知,Bi2WO6纳米片衍射峰的位置和Bi2WO6的标准卡片一一对应,印证的该材料的成功制备。除此之外,(200)晶面与(131)晶面的衍射峰强度之比接近1,表明Bi2WO6纳米片是沿着(001)晶面生长的。
Bi2WO6纳米片的紫外光谱图如图2所示。由图2可知,Bi2WO6的吸收边在410nm左右,吸收主要集中在紫外区。
Bi2WO6纳米片的TEM图如图3所示。由图3可知,本实施例制备的Bi2WO6呈纳米片状,且纳米片的横向尺寸为30~100nm。
2)Cs3Bi2I9/Bi2WO6
Cs3Bi2I9/Bi2WO6的XRD图如图4所示。由图4可知,Cs3Bi2I9/Bi2WO6出现了Cs3Bi2I9的衍射峰,印证了在Bi2WO6表面原位生长上了Cs3Bi2I9。
Cs3Bi2I9/Bi2WO6的紫外可见吸收谱图如图5所示。图5显示,在Bi2WO6表面原位生长上了Cs3Bi2I9之后,吸收边拓宽至600nm。
Cs3Bi2I9/Bi2WO6的TEM如图6所示。图6显示,纳米片状结构上生长了丰富的纳米颗粒,即Cs3Bi2I9纳米颗粒生长在Bi2WO6纳米片表面,Cs3Bi2I9纳米颗粒粒径为5~10nm。除此之外,Bi2WO6纳米片还保持的原有的形貌,横向尺寸为30~100nm。
Cs3Bi2I9/Bi2WO6的XPS如图7所示。由图7可以观测到Cs的3d和I的3d峰,印证了在Bi2WO6表面原位生长上了Cs3Bi2I9。
综上所述,本发明的复合纳米材料中,Cs3Bi2I9在Bi2WO6纳米片上成功生长,然而在制备过程中,本发明是直接将Bi2WO6悬浊液和CsI溶液混合进行反应,没有加入额外Bi原子,表明上述步骤4)制得的Bi2WO6纳米片中存在配位不饱和的Bi原子,因此能够利用该配位不饱和的Bi原子原位在Bi2WO6晶格中生长出Cs3Bi2I9,Bi2WO6和Cs3Bi2I9两种半导体是共用Bi原子的。
催化性能测试
本发明还将上述制备得到的Cs3Bi2I9/Bi2WO6应用于光催化还原CO2生成一氧化碳。
具体地,将3mg催化剂置于25mL单口平的底部,然后将高纯二氧化碳和水蒸气同时通入到光催化体系中,保证CO2是过饱和的。光源采用300W Xe,采用400nm的滤光片,在反应过程中保持反应体系为25℃。
Cs3Bi2I9/Bi2WO6用于光催化还原CO2制备CO的测试效果如图8所示。由图8可知,Cs3Bi2I9/Bi2WO6对于光催化还原CO2制备CO的反应具有较好的催化活性。
然而,对于单纯的Bi2WO6而言,其导带位置比二氧化碳还原的电位更正,从热力学方面讲,是不具备还原二氧化碳的能力的。本发明通过在Bi2WO6晶格中原位生长Cs3Bi2I9钙钛矿量子点,克服了单纯的Bi2WO6的缺陷,提高了催化活性。
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。
Claims (7)
1.一种0D/2D复合纳米材料,其特征在于:包括Bi2WO6纳米片和位于Bi2WO6纳米片晶格内的Cs3Bi2I9纳米颗粒;
所述Bi2WO6纳米片和Cs3Bi2I9纳米颗粒共享Bi原子。
2.根据权利要求1所述0D/2D复合纳米材料,其特征在于:所述Bi2WO6纳米片具有(001)晶面。
3.根据权利要求1所述0D/2D复合纳米材料,其特征在于:所述复合纳米材料的横向尺寸为30~100nm。
4.一种0D/2D复合纳米材料的制备方法,其特征在于,包括以下步骤:
(1)将Bi(NO3)3水溶液、Na2WO4水溶液和KI水溶液混合,反应得到具有配位不饱和Bi原子的Bi2WO6纳米片;
(2)将步骤(1)所制Bi2WO6纳米片与CsI溶液混合,反应得到0D/2D复合纳米材料。
5.根据权利要求4所述的制备方法,其特征在于:制备具有配位不饱和Bi原子的Bi2WO6纳米片过程中,反应温度为100~160℃。
6.根据权利要求4所述的制备方法,其特征在于:所述Bi(NO3)3、Na2WO4、KI和步骤(2)中CsI的摩尔比为(0.5~2.5):(0.25~1.25):(0.025~0.125):(0.006~0.031)。
7.一种催化还原CO2的方法,其特征在于:包括如下步骤:
以CO2为原料,以权利要求1~4任意一项所述0D/2D复合纳米材料为催化剂,在光照条件下进行CO2还原,得到产物CO。
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