CN111974424A - 一种制备磁性二溴五氧化四铋复合光催化材料的方法 - Google Patents
一种制备磁性二溴五氧化四铋复合光催化材料的方法 Download PDFInfo
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Abstract
一种制备磁性二溴五氧化四铋复合光催化材料的方法,其属于无机催化材料领域。本发明先用水热法制备了硬磁性材料锶铁氧体SrFe12O19,再通过微乳液法制备出了磁性二溴五氧化四铋复合光催化材料(Bi4O5Br2/SrFe12O19)。本发明方法制备工艺简单、使用设备少、能耗低。制备的Bi4O5Br2/SrFe12O19磁性能稳定、光催化活性高,在模拟太阳光氙灯照射下,用0.1g制备的复合磁性光催化剂降解100mL浓度为10mg/L的罗丹明B溶液,60min对罗丹明B的降解率达到99.3%,在外加磁场下对光催化剂的磁回收率为88.2%,重复使用3次后对罗丹明B的降解率为92.3%。本发明制备出的产品可广泛用于光催化降解有机污染物领域。
Description
技术领域
本发明涉及一种制备磁性二溴五氧化四铋(Bi4O5Br2/SrFe12O19)复合光催化材料的方法,属于无机环境光催化材料技术领域。
背景技术
二溴五氧化四铋(Bi4O5Br2)属于富氧型铋基卤氧化物,是一种新型纳米光催化材料。Bi4O5Br2内部的铋氧层([BiO]2+)和溴离子层(Br-)之间能形成内部电场,使产生的光生电子和空穴能得到有效的分离。Bi4O5Br2对可见光具有较强的响应能力,同时其电荷传输的阻力较小,进而有利于提高Bi4O5Br2的光催化活性。Bi4O5Br2的常用制备方法包括水化法、室温沉积法、超声辅助阴离子交换和煅烧法等。近年来,众多学者开展了元素掺杂和多相催化材料合成等方法来提高Bi4O5Br2的光催活性并收到成效。然而,光催化材料在光催化降解污染物时会分散于液体中,分离和回收困难制约着光催化材料的实际应用。复合磁性光催化材料通过外加磁场实现催化材料的回收再利用,能克服常规离心或过滤等回收方式能耗高、耗时长和工艺复杂的缺点。
锶铁氧体(SrFe12O19)属于硬磁性铁氧体,具有矫顽力高、剩余磁通密度大、生产成本低以及产品稳定性强等优势。目前,常见的SrFe12O19制备方法包括球磨法、热分解法、溶胶-凝胶法和超声沉淀法等。
目前,对Bi4O5Br2的研究主要集中在提高其光催化活性方面,而忽略了催化材料的回收和再利用。如“Journal of Photochemistry and Photobiology A:Chemistry”2017年第347卷中的“Synthesis of g-C3N4/Bi4O5Br2via reactable ionic liquid and itscooperation effect for the enhanced photocatalytic behavior towardsciprofloxacin degradation”(对比文件1),采用湿化学法制备出纯g-C3N4,然后再通过溶剂热法制备出g-C3N4/Bi4O5Br2复合光催化材料。该方法的不足之处在于:(1)制备的Bi4O5Br2催化活性不高,75min对罗丹明B的降解率仅为42%,复合物g-C3N4/Bi4O5Br2对罗丹明B的降解率为81%;(2)光催化材料回收(离心或抽滤)成本较高,且容易因回收不彻底造成二次污染。
又如发明专利“一种锶铁氧体负载的钒酸铋复合光催化剂的制备方法”(公开号:CN103480384A)(对比文件2),以焙烧法制备锶铁氧体,然后采用浸渍焙烧法制备锶铁氧体/钒酸铋复合磁性光催化材料。该方法的不足之处在于:(1)锶铁氧体是在800~1000℃焙烧2~4h制得,能耗高;(2)该方法制备的复合磁性光催化材料的光催化稳定性较差,回收后的光催化材料在5h内对亚甲基蓝的降解率由93%降低至60%。
发明内容
本发明的目的是针对Bi4O5Br2催化活性不高且难以回收再利用的问题,提出一种磁性Bi4O5Br2/SrFe12O19复合光催化材料的制备方法,制备方法简单、成本低。制备的磁性Bi4O5Br2/SrFe12O19复合光催化材料在模拟太阳光照射下具有较高的光催化活性,且便于通过外加磁场从液相体系中分离和回收,回收后的催化材料仍具有较高的光催化活性。该方法既简易、高效地实现了资源再利用,又避免了催化材料回收不全可能带来的二次污染。
本发明Bi4O5Br2/SrFe12O19的制备方法如下:
(1)SrFe12O19的制备
采用水热法制备SrFe12O19,分别称取2.1624g的FeCl3·6H2O和0.2666g的SrCl2·6H2O于烧杯中,接着向烧杯中加入20mL蒸馏水后超声振荡,直至固体完全溶解;在磁力搅拌的作用下向上述混合溶液中逐滴滴加浓度为5.2mol/L的NaOH溶液,调节溶液的pH至10后仍需继续搅拌10min;而后将混合溶液转移至100mL的聚四氟乙烯内胆中,将其密闭于不锈钢反应釜中后置于温度为200℃的烘箱中反应24h;反应结束后,抽滤,滤饼用稀盐酸浸泡1h后用蒸馏水反复洗涤,在65℃下干燥24h,研磨得到SrFe12O19。
(2)磁性Bi4O5Br2/SrFe12O19复合光催化材料的制备
称取0.56g的溴化1-辛基-3-甲基咪唑([Omim]Br)和0.2g的OP乳化剂(TX-100)于烧杯中,加入25mL去离子水,搅拌2h;称取质量分数为5%~15%的SrFe12O19加入到上述溶液中,继续搅拌1h,得到悬浊液A;称取1.94g的Bi(NO3)3·5H2O加入到5mL、1mol/L稀盐酸溶液中,超声至溶液清澈后滴加到悬浊液A中,搅拌10min后得到悬浊液B;向悬浊液B中缓慢滴加2M的NaOH溶液,调节pH至10.5,继续机械搅拌1h,得到悬浊液C;将悬浊液C倒入容量为100mL的聚四氟乙烯内胆中,放入反应釜后置于温度为160℃的烘箱中,连续反应12h,反应结束后自然冷却至室温,抽滤,滤饼用无水乙醇和蒸馏水多次洗涤后,置于温度为60℃的烘箱中干燥24h,研磨得到磁性Bi4O5Br2/SrFe12O19复合光催化材料。
本发明采用上述技术方案,主要有以下效果:
(1)本发明方法制备的磁性Bi4O5Br2/SrFe12O19复合光催化材料具有较高的光催化活性,在模拟太阳光氙灯照射下,0.1g制备的磁性Bi4O5Br2/SrFe12O19复合光催化材料,分散于100mL浓度为10mg/L的罗丹明B溶液中,光照60min后对罗丹明B的降解率达到99.3%(优于对比文件1制备的g-C3N4/Bi4O5Br2复合光催化材料)。
(2)本发明方法制备的磁性Bi4O5Br2/SrFe12O19复合光催化材料在外加磁场作用下的回收率高达88.2%,且3次重复使用后的降解率仍达到92.3%。
(3)本发明方法制备的磁性Bi4O5Br2/SrFe12O19复合光催化材料,制备操作方法简单,所需设备少,能耗低。
附图说明
图1为Bi4O5Br2、SrFe12O19和Bi4O5Br2/SrFe12O19的X射线衍射图谱。
图2为Bi4O5Br2/SrFe12O19的扫描电子显微镜图。
图3为SrFe12O19和Bi4O5Br2/SrFe12O19的磁滞回线图。
具体实施方式
下面结合具体实施方式,进一步说明本发明。
实施例1
一种制备磁性Bi4O5Br2/SrFe12O19复合催化材料的制备,具体步骤如下:
(1)SrFe12O19的制备
采用水热法制备SrFe12O19,分别称取2.1624g的FeCl3·6H2O和0.2666g的SrCl2·6H2O于烧杯中,接着向烧杯中加入20mL蒸馏水后超声振荡,直至固体完全溶解;在磁力搅拌的作用下向上述混合溶液中逐滴滴加浓度为5.2mol/L的NaOH溶液,调节溶液的pH至10后仍需继续搅拌10min;而后将混合溶液转移至100mL的聚四氟乙烯内胆中,将其密闭于不锈钢反应釜中后置于温度为200℃的烘箱中反应24h;反应结束后,抽滤,滤饼用稀盐酸浸泡1h后用蒸馏水反复洗涤,在65℃下干燥24h,研磨得到SrFe12O19。
(2)磁性Bi4O5Br2/SrFe12O19复合光催化材料的制备
称取0.56g的[Omim]Br和0.2g的TX-100于烧杯中,加入25mL去离子水,搅拌2h;称取质量分数为5%的SrFe12O19加入到上述溶液中,继续搅拌1h,得到悬浊液A;称取1.94g的Bi(NO3)3·5H2O加入到5mL、1mol/L稀盐酸溶液(1M)中,超声至溶液清澈后滴加到悬浊液A中,搅拌10min后得到悬浊液B;向悬浊液B中缓慢滴加2M的NaOH溶液,调节pH至10.5,继续机械搅拌1h,得到悬浊液C;将悬浊液C倒入容量为100mL的聚四氟乙烯内胆中,放入反应釜后置于温度为160℃的烘箱中,连续反应12h,反应结束后自然冷却至室温,抽滤,滤饼用无水乙醇和蒸馏水多次洗涤后,置于温度为60℃的烘箱中干燥24h,研磨得到磁性Bi4O5Br2/SrFe12O19复合光催化材料。
实施例2
一种制备磁性Bi4O5Br2/SrFe12O19复合催化材料的制备,具体步骤如下:
(1)SrFe12O19的制备
同实施例1中(1)。
(2)磁性Bi4O5Br2/SrFe12O19复合光催化材料的制备
称取0.56g的[Omim]Br和0.2g的TX-100于烧杯中,加入25mL去离子水,搅拌2h;称取质量分数为10%的SrFe12O19加入到上述溶液中,继续搅拌1h,得到悬浊液A;称取1.94g的Bi(NO3)3·5H2O加入到5mL稀盐酸溶液(1M)中,超声至溶液清澈后滴加到悬浊液A中,搅拌10min后得到悬浊液B;向悬浊液B中缓慢滴加2M的NaOH溶液,调节pH至10.5,继续机械搅拌1h,得到悬浊液C;将悬浊液C倒入容量为100mL的聚四氟乙烯内胆中,放入反应釜后置于温度为160℃的烘箱中,连续反应12h,反应结束后自然冷却至室温,抽滤,滤饼用无水乙醇和蒸馏水多次洗涤后,置于温度为60℃的烘箱中干燥24h,研磨得到磁性Bi4O5Br2/SrFe12O19复合光催化材料。
实施例3
一种制备磁性Bi4O5Br2/SrFe12O19复合催化材料的制备,具体步骤如下:
(1)SrFe12O19的制备
同实施例1中(1)。
(2)磁性Bi4O5Br2/SrFe12O19复合光催化材料的制备
称取0.56g[Omim]Br和0.2g TX-100于烧杯中,加入25mL去离子水后搅拌2h,然后称取质量分数为15%的SrFe12O19加入到上述溶液中继续搅拌1h得到悬浊液A;称取1.94gBi(NO3)3·5H2O加入到5mL稀盐酸溶液(1M)中,超声至溶液清澈后滴加到悬浊液A中,搅拌10min后得到悬浊液B;向悬浊液B中缓慢滴加2M的NaOH溶液,调节PH至10.5后继续机械搅拌1h后获得悬浊液C;然后将悬浊液C悬浊液倒入容量为100mL的聚四氟乙烯内胆中,放入反应釜后置于温度为160℃的烘箱中连续反应12h,反应结束后冷却至室温;经抽滤获得的滤渣用无水乙醇和蒸馏水多次洗涤后置于温度为60℃的烘箱中干燥24h,研磨得到Bi4O5Br2/SrFe12O19复合光催化材料。
实验结果
实施例1制备的磁性Bi4O5Br2/SrFe12O19复合光催化材料催化降解活性最佳。为了方便对比,制备了Bi4O5Br2样品。Bi4O5Br2制备方法为实施例1步骤(2)中不加入SrFe12O19。
Bi4O5Br2的X射线衍射图谱如图1所示,所有衍射峰均能指标化为单斜系(monoclinic)的Bi4O5Br2(JCPDS No.:37-0699);图中2θ为24.42°、29.67°、31.93°、39.20°、43.73°和45.61°处出现的衍射峰分别与(112)、(11-3)、(020)、(40-4)、(32-3)和(422)晶面相对应,表明其结晶度良好,没有杂晶生成。
SrFe12O19的X射线衍射图谱如图1所示,所有衍射峰均能指标化为六边形的SrFe12O19(JCPDS No.:33-1340),晶胞参数为α=β=90°,γ=120°;图中2θ为32.35°、33.15°、34.18°、35.39°、49.48°和53.91°处出现的衍射峰分别与(107)(104)(114)(201)(024)(300)晶面相对应;利用谢乐公式计算得到SrFe12O19样品的平均晶粒尺寸为76.3nm。
Bi4O5Br2/SrFe12O19的X射线衍射图谱如图1所示,Bi4O5Br2/SrFe12O19复合光催化材料的主要衍射峰与Bi4O5Br2基本一致,但在33.40°和35.78°处出现了SrFe12O19衍射峰,表明SrFe12O19与Bi4O5Br2成功复合。
Bi4O5Br2/SrFe12O19的扫描电镜图如图2所示,Bi4O5Br2的主要形貌为不规则的纳米片状,SrFe12O19为六边形片状,且Bi4O5Br2纳米片不规则地负载在SrFe12O19六边形片层上,表明Bi4O5Br2与SrFe12O19成功复合。
SrFe12O19和Bi4O5Br2/SrFe12O19的磁性参数测试如图3所示,SrFe12O19的饱和磁化强度为46.5emu/g,矫顽力为826.57G,表明SrFe12O19为硬磁性材料。Bi4O5Br2/SrFe12O19的饱和磁化强度为2.8emu/g,仍然能够被有效磁回收。
光催化结果表明,在模拟太阳光氙灯照射下,0.1g制备的磁性复合光催化材料降解100mL浓度为10mg/L的罗丹明B溶液,60min的降解率达到99.3%,在外加磁场下对光催化材料的磁回收率为88.2%,重复使用3次后的降解率为92.3%,说明采用本发明制备的磁性Bi4O5Br2/SrFe12O19复合光催化材料具有较高的光催化活性和稳定的磁回收性能。
Claims (2)
1.一种制备磁性二溴五氧化四铋复合光催化材料的方法,其特征在于包括以下步骤:
(1)锶铁氧体的制备
采用水热法制备SrFe12O19,分别称取2.1624g的FeCl3·6H2O和0.2666g的SrCl2·6H2O于烧杯中,接着向烧杯中加入20mL蒸馏水后超声振荡,直至固体完全溶解;在磁力搅拌的作用下向上述混合溶液中逐滴滴加浓度为5.2mol/L的NaOH溶液,调节溶液的pH至10后仍需继续搅拌10min;而后将混合溶液转移至100mL的聚四氟乙烯内胆中,将其密闭于不锈钢反应釜中后置于温度为200℃的烘箱中反应24h;反应结束后,抽滤,滤饼用稀盐酸浸泡1h后用蒸馏水反复洗涤,在65℃下干燥24h,研磨得到SrFe12O19;
(2)磁性二溴五氧化四铋复合光催化材料的制备
称取0.56g的溴化1-辛基-3-甲基咪唑和0.2g的OP乳化剂于烧杯中,加入25mL去离子水,搅拌2h;称取质量分数为5%~15%的SrFe12O19加入到上述溶液中,继续搅拌1h,得到悬浊液A;称取1.94g的Bi(NO3)3·5H2O加入到5mL、浓度为1mol/L的稀盐酸溶液中,超声至溶液清澈后滴加到悬浊液A中,搅拌10min后得到悬浊液B;向悬浊液B中缓慢滴加2M的NaOH溶液,调节pH至10.5,继续机械搅拌1h,得到悬浊液C;将悬浊液C倒入容量为100mL的聚四氟乙烯内胆中,放入反应釜后置于温度为160℃的烘箱中,连续反应12h,反应结束后自然冷却至室温,抽滤,滤饼用无水乙醇和蒸馏水多次洗涤后,置于温度为60℃的烘箱中干燥24h,研磨得到磁性Bi4O5Br2/SrFe12O19复合光催化材料。
2.根据权利要求1所述的磁性二溴五氧化四铋复合光催化材料的制备方法,其特征在于以微乳液法制备,实现了磁性基体锶铁氧体与活性组分二溴五氧化四铋的有效复合。
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