CN108043400B - 一种Au-Bi2MoO6/硅藻土复合材料及其制备方法与应用 - Google Patents
一种Au-Bi2MoO6/硅藻土复合材料及其制备方法与应用 Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 33
- 229910002900 Bi2MoO6 Inorganic materials 0.000 title claims abstract description 29
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- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种Au‑Bi2MoO6/硅藻土复合材料及其制备方法与应用,本发明制备方法采用尿素作溶胶凝胶剂,可以在硅藻上同步生成Au‑Bi2MoO6,制备方法无废水产生,无强酸、强碱的使用,过程简便且无废水产生,绿色环保水平高。本发明制备的Au‑Bi2MoO6/硅藻土复合材料具有可见光催化性能,可应用于印染废水、含Cr(Ⅵ)废水的光催化净化。
Description
(一)技术领域
本发明涉及一种Au-Bi2MoO6/硅藻土复合材料及其制备方法与应用,具体涉及利用硅藻土作载体制备Au-Bi2MoO6/硅藻土复合材料,属于新型非金属矿物材料开发技术领域。
(二)背景技术
天然硅藻土是由生物硅藻遗骸沉积形成的硅质沉积岩,主要成分为无定型SiO2。因硅藻土具有质轻、多孔、化学稳定和含有大量表面羟基的特性,使其成为良好的吸附材料和催化剂载体材料。人们已经发现了硅藻土的实用价值,并把它用作光催化剂载体广泛应用于污水或空气净化。
目前,硅藻土基复合光催化材料相关研究多是以硅藻土作载体负载半导体TiO2、ZnO和CdS等,但由于TiO2、ZnO的禁带宽度较大,导致TiO2/硅藻土复合光催化材料或ZnO/硅藻土复合光催化材料只能对紫外光(λ<390nm)响应性较好,而太阳光中紫外光所占的比例还不足5%,导致不能充分利用太阳光资源。虽然CdS/硅藻土复合光催化材料能够在可见光下表现出一定的光催化能力,但因其在使用时可能会在水中释放有毒的镉离子,所以未被广泛应用。因此,开发高效环保可见光响应型硅藻土基光催化材料成为重要研究方向。
近年来,为充分利用绿色环保的太阳能资源,新型铋系Bi2MoO6半导体表现出优良的可见光响应特性,其禁带宽度为Eg=2.71eV,具有可见光催化效果和良好的化学稳定性,但由于Bi2MoO6颗粒无孔或少孔、比表面积小,使得其光催化反应速率受到吸附速率的制约,导致催化效率下降,因此需要多孔矿物硅藻土作载体制备Bi2MoO6/硅藻土复合型光催化材料。此外,由于单体系Bi2MoO6的光生载流子易于在其表面或内部复合,造成量子效率偏低,影响Bi2MoO6光催化降解效率。常采用贵金属与Bi2MoO6复合的方法来改善Bi2MoO6载流子复合率高的缺陷,经检索文献发现,目前对Bi2MoO6与Au复合多是通过两步反应工艺,即第一步先制得Bi2MoO6、第二步再与Au复合,见以下参考文献:①Jinhong Bi,Wei Fang,Li Li,etal.Ternary reduced-graphene-oxide/Bi2MoO6/Au nanocomposites with enhancedphotocatalytic activity under visible light.Journal of Alloys and Compounds,2015,649:28-34。通过两步反应制备Bi2MoO6/Au复合材料的方法会导致制备成本增高、工艺复杂,对工业化生产不利。
针对目前硅藻土基光催化材料可见光催化效率低、环保性差和制备Au-Bi2MoO6复合材料工艺复杂的不足,本发明提供一种 Au-Bi2MoO6/硅藻土复合材料及其制备方法,用于避免或改善以上不足。
(三)发明内容
为了克服上述问题,本发明提供一种Au-Bi2MoO6/硅藻土复合材料及其制备方法,以解决现有硅藻土复合光催化材料效率低、环保性差和制备Au-Bi2MoO6复合材料步骤复杂的不足。
为达到上述目的,本发明采用如下技术方案:
一种Au-Bi2MoO6/硅藻土复合材料,所述的Au-Bi2MoO6/硅藻土复合材料具体按如下方法进行制备:
(1)将硅藻土分散于去离子水中,随后加入质量浓度为1%的三水合四氯金酸溶液,搅拌混合得到混合液A;所述的硅藻土与去离子水、三水合四氯金酸溶液的质量比为1:4~6:0.5~0.6;
(2)将尿素溶解于去离子水中,得到混合液B;所述的尿素与去离子水的质量比为1:2.5~3;
(3)将Bi(NO3)3·5H2O搅拌溶于乙二醇和丙三醇的混合溶液中,得到混合液C;所述的Bi(NO3)3·5H2O与乙二醇、丙三醇的质量比为 1:4.3~4.72:0.5~1;
(4)将(NH4)6Mo7O24·4H2O溶解于去离子水中,得到混合液D;所述的(NH4)6Mo7O24·4H2O与去离子水的质量比为1:56~68;
(5)将步骤(1)所得混合液A缓慢加入到步骤(2)所得混合液B中,搅拌得到混合液E,随后将步骤(3)所得混合液C缓慢加入到所述的混合液E中,搅拌得到混合液F;所述混合液A中所投入的硅藻土与混合液B中所投入的尿素、混合液C中所投入的 Bi(NO3)3·5H2O质量比为1:0.8~0.9:0.2426~0.3881;
(6)将步骤(4)所得混合液D缓慢加入到步骤(5)所得混合液F中,搅拌得到混合液G,将混合液G置于96~97℃下反应得到溶胶状产物,再将所述的溶胶状产物干燥得到凝胶,将所得凝胶置于 400~550℃马弗炉中煅烧即可得到Au-Bi2MoO6/硅藻土复合材料;所述混合液F的加入量以所述混合液C中所投入的Bi(NO3)3·5H2O质量来计,所述的混合液D中投入的(NH4)6Mo7O24·4H2O与所述混合液C 中所投入的Bi(NO3)3·5H2O质量比为1:5.46~5.49。
进一步,步骤(6)中,所述的干燥温度为120℃。
进一步,步骤(6)中,所述的煅烧时间为3h。
本发明制备的Au-Bi2MoO6/硅藻土复合材料可替代TiO2、ZnO和 CdS等传统光催化剂,应用于印染废水、含Cr(Ⅵ)废水的光催化净化。
与现有技术相比,本发明的有益效果在于:
(1)本发明所述Au-Bi2MoO6/硅藻土复合材料具有可见光催化活性,能够利用可见光下高效催化降解有机污染物;
(2)本发明所述制备方法采用的凝胶-煅烧的方法,可在硅藻土上同步生成Au-Bi2MoO6,不需要两步分别制备Bi2MoO6和Au,工艺简便、流程短,易于工业化生产;
(3)本发明所述制备方法无废水产生,无强酸、强碱的使用,绿色环保水平高。
(四)附图说明
图1为本发明实施例3制备的Au-Bi2MoO6/硅藻土复合材料的 XRD图。
(五)具体实施方式
下面对照具体实施例和附图对本发明作进一步的说明,但本发明的保护范围并不仅限于此。
实施例1:
(1)称取1.3g硅藻土分散于6.5g去离子水中,随后加入0.65g 质量浓度为1%的三水合四氯金酸(HAuCl4·3H2O)溶液,搅拌混合得到混合液A;
(2)称取1.15g尿素溶解于3.1g去离子水中,得到混合液B;
(3)称取0.39g Bi(NO3)3·5H2O搅拌溶于1.755g乙二醇和0.3g 丙三醇的混合液中,得到混合液C;
(4)称取0.071g(NH4)6Mo7O24·4H2O溶解于4.26g去离子水中,得到混合液D;
(5)将步骤(1)所得混合液A缓慢加入到步骤(2)所得混合液B中,搅拌2min得到混合液E,随后将步骤(3)所得混合液C 缓慢加入到所述的混合液E中,搅拌3min得到混合液F;
(6)将步骤(4)所得混合液D缓慢加入到步骤(5)所得混合液F中,搅拌2min得到混合液G,将混合液G置于96℃水浴生成溶胶状,再置于120℃烘箱生成凝胶后,随后置于500℃马弗炉中煅烧 3h即可得到Au-Bi2MoO6/硅藻土复合材料。
实施例2:
(1)称取0.8g硅藻土分散于4.8g去离子水中,随后加入0.48g 质量浓度为1%的三水合四氯金酸(HAuCl4·3H2O)溶液,搅拌混合得到混合液A;
(2)称取0.64g尿素溶解于1.92g去离子水中,得到混合液B;
(3)称取0.3105g Bi(NO3)3·5H2O搅拌溶于1.4656g乙二醇和 0.1553g丙三醇的混合液中,得到混合液C;
(4)称取0.0569g(NH4)6Mo7O24·4H2O溶解于3.869g去离子水中,得到混合液D;
(5)将步骤(1)所得混合液A缓慢加入到步骤(2)所得混合液B中,搅拌3min得到混合液E,随后将步骤(3)所得混合液C 缓慢加入到所述的混合液E中,搅拌5min得到混合液F;
(6)将步骤(4)所得混合液D缓慢加入到步骤(5)所得混合液F中,搅拌1min得到混合液G,将混合液G置于97℃水浴生成溶胶状,再置于120℃烘箱生成凝胶后,随后置于400℃马弗炉中煅烧 3h即可得到Au-Bi2MoO6/硅藻土复合材料。
实施例3:
(1)称取1.8g硅藻土分散于7.2g去离子水中,随后加入0.9g 质量浓度为1%的三水合四氯金酸(HAuCl4·3H2O)溶液,搅拌混合得到混合液A;
(2)称取1.62g尿素溶解于4.05g去离子水中,得到混合液B;
(3)称取0.4367g Bi(NO3)3·5H2O搅拌溶于1.8778g乙二醇和 0.4367g丙三醇的混合液中,得到混合液C;
(4)称取0.0795g(NH4)6Mo7O24·4H2O溶解于4.452g去离子水中,得到混合液D;
(5)将步骤(1)所得混合液A缓慢加入到步骤(2)所得混合液B中,搅拌1min得到混合液E,随后将步骤(3)所得混合液C 缓慢加入到所述的混合液E中,搅拌1min得到混合液F;
(6)将步骤(4)所得混合液D缓慢加入到步骤(5)所得混合液F中,搅拌2min得到混合液G,将混合液G置于96℃水浴生成溶胶状,再置于120℃烘箱生成凝胶后,随后置于550℃马弗炉中煅烧 3h即可得到Au-Bi2MoO6/硅藻土复合材料。
性能测试实验:
复合材料光催化性能测试是在光化学反应仪(BL-GHX-V)中进行的,首先在石英反应管中加入50ml初始浓度10mg/L的亚甲基蓝(MB)溶液,称取0.05g实施例1~3之一制备的Au-Bi2MoO6/硅藻土复合材料加入到上述50mlMB溶液中,暗吸附0.5h后,开启1000W 氙灯模拟自然光照8h,通过紫外可见分光光度计测试溶液中剩余亚甲基蓝(MB)浓度,计算亚甲基蓝降解率(%)。实验结果如表1和表2所示。
表1实施例1~3样品的检测剩余亚甲基蓝(MB)浓度
样品 | 实施例1 | 实施例2 | 实施例3 |
亚甲基蓝(MB)浓度 | 0.79 | 0.68 | 0.44 |
表2实施例1~3样品的检测分析结果
样品 | 实施例1 | 实施例2 | 实施例3 |
MB降解率(%) | 92.1 | 93.2 | 95.6 |
通过表2中实施例1~3样品的MB降解率检测分析结果可知,实施例1~3样品在模拟自然光照射8h下对MB降解率大于90%,说明实施例1~3样品对模拟印染废水的可见光催化性能较好。
Claims (4)
1.一种Au-Bi2MoO6/硅藻土复合材料,其特征在于:所述的Au-Bi2MoO6/硅藻土复合材料按如下方法制备得到:
(1)将硅藻土分散于去离子水中,随后加入质量浓度为1%~3%的三水合四氯金酸溶液,搅拌混合得到混合液A;所述的硅藻土与去离子水、三水合四氯金酸溶液的质量比为1:4~6:0.5~0.6;
(2)将尿素溶解于去离子水中,得到混合液B;所述的尿素与去离子水的质量比为1:2.5~3;
(3)将Bi(NO3)3·5H2O搅拌溶于乙二醇和丙三醇的混合溶液中,得到混合液C;所述的Bi(NO3)3·5H2O与乙二醇、丙三醇的质量比为1:4.3~4.72:0.5~1;
(4)将(NH4)6Mo7O24·4H2O溶解于去离子水中,得到混合液D;所述的(NH4)6Mo7O24·4H2O与去离子水的质量比为1:56~68;
(5)将步骤(1)所得混合液A缓慢加入到步骤(2)所得混合液B中,搅拌得到混合液E,随后将步骤(3)所得混合液C缓慢加入到所述的混合液E中,搅拌得到混合液F;所述混合液A中所投入的硅藻土与混合液B中所投入的尿素、混合液C中所投入的Bi(NO3)3·5H2O质量比为1:0.8~0.9:0.2426~0.3881;
(6)将步骤(4)所得混合液D缓慢加入到步骤(5)所得混合液F中,搅拌得到混合液G,将混合液G置于96~97℃下反应得到溶胶状产物,再将所述的溶胶状产物干燥得到凝胶,将所得凝胶置于400~550℃马弗炉中煅烧即可得到Au-Bi2MoO6/硅藻土复合材料;所述混合液F的加入量以所述混合液C中所投入的Bi(NO3)3·5H2O质量来计,所述的混合液D中投入的(NH4)6Mo7O24·4H2O与所述混合液C中所投入的Bi(NO3)3·5H2O质量比为1:5.46~5.49。
2.如权利要求1所述的Au-Bi2MoO6/硅藻土复合材料,其特征在于:步骤(6)中,所述的干燥温度为120℃。
3.如权利要求1所述的Au-Bi2MoO6/硅藻土复合材料,其特征在于:步骤(6)中,所述的煅烧时间为3h。
4.一种如权利要求1所述的Au-Bi2MoO6/硅藻土复合材料作为光催化剂用于印染废水、含Cr(Ⅵ)废水的光催化净化的应用。
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