CN106964389A - 钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂的制备方法 - Google Patents
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Abstract
本发明提供了一种钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂的制备方法，称取钒酸铋，在钒酸铋中加入氮掺杂石墨烯量子点，钒酸铋和氮掺杂石墨烯量子点的质量比为1：0.025~0.1，充分搅拌均匀后真空干燥过夜，将充分干燥的样品研磨后置于持续通入氩气的管式炉中170~190℃焙烧1~2h，获得钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂。本发明将钒酸铋与适量的氮掺杂石墨烯量子点复合可以更好地吸附有机染料，同时促进光生载流子的有效分离，提高其可见光催化性能，极大提高降解亚甲基蓝性能，可应用于环境有机污染物治理等领域。
Description
技术领域
本发明属于化工领域，涉及一种光催化剂，具体来说是一种钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂的制备方法。
背景技术
近年来，环境污染和能源危机日益加剧，光催化作为一种无污染、简单易行并可直接利用太阳能的技术备受广泛关注。半导体光催化材料的制备和应用研究虽已取得不小进展，但光催化材料的实际商业应用仍然面临着巨大挑战，主要由于传统半导体光催化剂能带隙过宽，一般只有在紫外光激发下才能显示光催化活性，而紫外光能量在太阳光总能量比例仅4%。因此，高效稳定可见光响应光催化剂的开发成为光催化领域的研究热点。
钒酸盐系光催化剂因其特殊结构及优异的物理化学性能，常被应用于电催化和锂电池领域，在环境治理方面也表现出优异的光催化性能。作为碳纳米材料的新成员，氮掺杂石墨烯量子点由于具有良好的水溶性、生物低毒性、稳定而明亮的荧光等特点，在这几年里吸引了广泛的研究热情。
发明内容
针对现有技术中的上述技术问题，本发明提供了一种钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂的制备方法，所述的这种钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂的制备方法要解决现有技术中的光催化剂的催化效果不佳的技术问题。
本发明提供了一种钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂的制备方法，称取钒酸铋，在钒酸铋中加入氮掺杂石墨烯量子点，钒酸铋和氮掺杂石墨烯量子点的质量比为1：0.025~0.1，充分搅拌均匀后真空干燥过夜，将充分干燥的样品研磨后置于持续通入氩气的管式炉中170~190℃焙烧1~2h，获得钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂。
进一步的，钒酸铋和氮掺杂石墨烯量子点的质量比为1：0.025。
进一步的，钒酸铋和氮掺杂石墨烯量子点的质量比为1：0.05。
进一步的，钒酸铋和氮掺杂石墨烯量子点的质量比为1：0.1。
进一步的，所述的氮掺杂石墨烯量子点的水溶液浓度为30~50g/L。
本发明还提供了上述的方法制备的钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂用于光催化降解有机染料亚甲基蓝。
本发明使用水热法制备BiVO4@NGQDs样品。本发明制备的钒酸铋/氮掺杂石墨烯量子点复合型可见光催化剂在可见光下具有高光催化活性，特别是在染料吸附和降解有机污染物亚甲基蓝方面，BiVO4@5wt%NGQDs催化活性最佳。钒酸铋与适量的氮掺杂石墨烯量子点复合可以更好地吸附有机染料，同时促进光生载流子的有效分离，提高其可见光催化性能。综合来看，钒酸铋/氮掺杂石墨烯量子点复合型可见光催化剂制备工艺简单可行，少量NGQDs添加即可极大提高降解亚甲基蓝性能，可应用于环境有机污染物治理等领域。
本发明和已有技术相比，其技术进步是显著的。以亚甲基蓝为目标污染物，在可见光激发下，本发明所制备的钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂具有高可见光催化降解亚甲基蓝活性。本发明采用直接掺杂法制备钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂，实验室制备工艺简单、成本低。
附图说明
图1为采用本发明的方法制备的钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂的透射电镜图。
图2为采用本发明方法制备的钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂在黑暗条件下对亚甲基蓝（10ppm）的吸附-时间曲线及可见光照射下（>420 nm）对亚甲基蓝（10ppm）的光催化降解-时间曲线。
具体实施方式
以下用实施例对本发明作进一步说明，但不限于此。
实施例1：
BiVO4@2.5wt%NGQDs制备具体步骤：
（1）取1 g BiVO4加入0.625 ml浓度为40 g/L的NGQDs水溶液，充分搅拌均匀后真空干燥过夜；
（2）将充分干燥的样品研磨后置于持续通入氩气的管式炉中180℃焙烧1.5 h。
实施例2：
BiVO4@5wt%NGQDs制备具体步骤：本实施实例与实施例1基本相同，所不同的是 (1)步骤中取1.25 ml浓度为40 g/L的NGQDs水溶液。
实施例3：
BiVO4@10wt%NGQDs制备具体步骤：本实施实例与实施例1基本相同，所不同的是 (1)步骤中取2.5 ml浓度为40 g/L的NGQDs水溶液。
图1(a)为NGQDs透射电镜图，由图1(a)可知，量子点的直径尺寸均为1.5-4.0nm。图1(b)为NGQDs高分辨透射电镜图，由图1(b)，我们可以观察到按上述步骤制备的样品清晰的晶格条纹。图1(c)为BiVO4@5wt%NGQDs透射电镜图，图1(d)为BiVO4@5wt%NGQDs高分辨透射电镜图，由图1(c)和图1(d) 可知，按上述步骤制备的样品，NGQDs被成功地负载到BiVO4纳米粒子表面。
图2(a)为钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂，黑暗条件下对亚甲基蓝（10ppm）吸附-时间曲线图,图2(b)为钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂，可见光照射下（λ >420 nm）对亚甲基蓝（10ppm）光催化降解-时间曲线。由图2可知，本发明制备的钒酸铋/氮掺杂石墨烯量子点复合型可见光催化剂在可见光下具有高光催化活性，特别是在染料吸附和降解有机污染物亚甲基蓝方面，BiVO4@5wt%NGQDs催化活性最佳。
上述内容仅为本发明构思下的基本说明，而依据本发明的技术方案所做的任何等效变换，均应属本发明的保护范围。
Claims (6)
1.一种钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂的制备方法，其特征在于：称取钒酸铋，在钒酸铋中加入氮掺杂石墨烯量子点，钒酸铋和氮掺杂石墨烯量子点的质量比为1：0.025~0.1，充分搅拌均匀后真空干燥过夜，将充分干燥的样品研磨后置于持续通入氩气的管式炉中170~190℃焙烧1~2h，获得钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂。
2.根据权利要求1所述的一种钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂的制备方法，其特征在于：钒酸铋和氮掺杂石墨烯量子点的质量比为1：0.025。
3.根据权利要求1所述的一种钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂的制备方法，其特征在于：钒酸铋和氮掺杂石墨烯量子点的质量比为1：0.05。
4.根据权利要求1所述的一种钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂的制备方法，其特征在于：钒酸铋和氮掺杂石墨烯量子点的质量比为1：0.1。
5.根据权利要求1所述的一种钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂的制备方法，其特征在于：所述的氮掺杂石墨烯量子点的水溶液浓度为30~50g/L。
6.权利要求1所述的方法制备的钒酸铋与氮掺杂石墨烯量子点复合型可见光催化剂用于光催化降解有机染料亚甲基蓝。
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| CN108359462A (zh) * | 2018-04-18 | 2018-08-03 | 兰州大学 | 一种钒酸铋量子点及其制备方法、还原氧化石墨烯气凝胶材料及其制备方法以及光催化剂 |
| CN108579727A (zh) * | 2018-01-11 | 2018-09-28 | 湘潭大学 | 一种石墨烯量子点-钨酸铋复合光催化剂及其制备方法 |
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