CN106861763A - 一种In2S3‑TiO2/电纺纤维复合光催化剂的制备方法 - Google Patents
一种In2S3‑TiO2/电纺纤维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In2S3‑TiO2/电纺纤维复合光催化剂的制备方法,包括步骤:制备PVDF/SMA电纺纤维毡、制备TiO2/电纺纤维毡、制备In2S3‑TiO2/电纺纤维复合光催化剂。本发明的有益效果是:(1)该复合催化材料中有机相和无机相的相互作用能力增强,而使其产氢速率增加;(2)该复合催化材料在可见光照射下有较好的重复稳定性,且负载在电纺纤维表面的In2S3‑TiO2比表面积较高,达0.067~0.096m2/g,光源利用率高。
Description
技术领域
本发明属于复合纳米纤维领域,涉及一种In2S3-TiO2/电纺纤维复合光催化剂的制备方法。
背景技术
氢能是一种理想的新型含能体能源,氢不仅是一种优质燃料,还是工业生产中的重要原料和物料。氢能具有热值高、贮存使用安全环保、运输方便等诸多优点,被认为是新世纪最理想的绿色能源,受到全世界学者的普遍关注。利用光催化降解有机污染物也成为解决环境污染问题的理想方法。为找出能有效利用太阳能的光催化剂,国内外众多学者做出了大量研究,目前已经研制出在可见光下响应的粉体光催化材料,并取得了良好的光催化效果。但是粉体光催化剂仍然存在一些实际问题,第一,粉体光催化剂的光生电子-空穴对容易复合,光催化效率低;第二,粉体光催化剂在水中的比表面积小、分散性较差、易漂浮粘壁、不容易回收。因此,制备一种催化效率高、较稳定、可多次重复使用、可见光响应的光催化复合材料成为当前的研究热点。
TiO2和硫属半导体是常见的两类光催化剂,TiO2具有众多优点,无毒害,性质稳定、光催化效率高、耐酸碱性好,然而TiO2光吸收范围狭窄,太阳光利用率低,只能吸收紫外光,应用范围有限。相比于TiO2,硫属半导体通过掺杂、敏化、复合、交联等方式进行改性后,其性质变得稳定,光催化活性提高,其光吸收范围可扩展至可见光区域。
In2S3的禁带宽度为2eV,导带为-0.8eV,价带为1.2eV,能与可见光很好的匹配,并表现出很好的光电、光催化性能,在光电功能材料、电化学传感器及可见光制氢等领域具有潜在价值。TiO2是n型半导体,In2S3和TiO2复合,经光照,In2S3首先被光激发,产生的电子向TiO2迁移,同时In2S3的价带和TiO2的导带间存在电势差,TiO2价带的空穴向In2S3迁移,复合半导体促进了光生电子和空穴的分离,提高了光催化活性。
利用静电纺丝法制备纳米级的聚合物纺丝纤维,与催化材料相复合,可形成负载型复合光催化材料。静电纺丝纤维的比表面积较大,孔隙率高,有利于光催化剂的分散、不易团聚;透光率较高,提高光照利用率;柔韧性较好,有利于制备的复合光催化剂形状多样化,使之适合反应容器。将聚合物纺丝纤维的柔韧性和光催化剂的催化效果相结合,制备过程简单,工艺环保、催化效率高,有利于光催化剂的分散,提高其光照利用率。并且,纤维载体与光催化剂之间相互作用,能够提高光生电子-空穴的分离效果,增强光催化剂的稳定性,提高其光催化效率。
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In2S3-TiO2/电纺纤维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In2S3-TiO2/电纺纤维复合光催化剂的制备方法,其特征是:包括静电纺丝法和水热法,具体为以下步骤:
(1)将苯乙烯-马来酸酐交替共聚物(SMA)和聚偏氟乙烯(PVDF)加入到带搅拌和N2保护的三口烧瓶中,溶于三口烧瓶中的丙酮和DMAC,搅拌溶解24h,得到纺丝溶液;
(2)将步骤(1)得到的纺丝溶液在静电纺丝装置中制备PVDF/SMA电纺纤维毡;
(3)将步骤(2)得到的PVDF/SMA电纺纤维毡浸到硫酸氧钛水溶液中,浸泡24h,然后于水热反应釜中,120℃反应14h,自然冷却至室温,洗涤,干燥,得到TiO2/电纺纤维毡;
(4)将步骤(3)得到的TiO2/电纺纤维毡浸到硝酸铟水溶液中,加入硫代乙酰胺水溶液,浸泡24h,然后于水热反应釜中,120℃反应14h,自然冷却至室温,洗涤,干燥,得到In2S3-TiO2/电纺纤维复合光催化剂。
进一步地,步骤(1)中苯乙烯-马来酸酐交替共聚物和聚偏氟乙烯的质量比为1:8~10,苯乙烯-马来酸酐交替共聚物和聚偏氟乙烯的总质量与丙酮的体积比为0.25~0.3g/ml,苯乙烯-马来酸酐交替共聚物和聚偏氟乙烯的总质量与DMAC的体积比为0.2~0.25g/ml。
进一步地,步骤(2)中纺丝条件为纺丝电压16kv,接收装置与喷丝头之间的收丝距离为15~25cm,纺丝溶液流速为0.4ml/h。
进一步地,步骤(3)中硫酸氧钛水溶液浓度为0.25~0.5mol/L,与PVDF/SMA电纺纤维毡的质量比为200~30:1。
进一步地,步骤(4)中硝酸铟水溶液的浓度为0.25~0.5mol/L,硫代乙酰胺溶液的浓度为0.5~1mol/L,TiO2/电纺纤维毡与硝酸铟水溶液的质量体积比为0.5~2.0g/25ml,TiO2/电纺纤维毡与硫代乙酰胺水的质量体积比为0.5~2.0g/25ml。
进一步地,步骤(3)和(4)中水热反应产物放置于去离子水中超声波洗涤3次,60℃真空干燥12h。
由TGA测得PVDF/SMA电纺纤维毡最终质量损失为93%,In2S3-TiO2/电纺纤维复合材料的最终热失重率为58.37%,因此负载的催化剂质量分数经计算后约45.76%。
本发明的有益效果是:(1)该复合催化材料中有机相和无机相的相互作用能力增强,而使其产氢速率增加;(2)该复合催化材料在可见光照射下有较好的重复稳定性,且负载在电纺纤维表面的In2S3-TiO2比表面积较高,达0.067~0.096m2/g,光源利用率高。
附图说明
下面结合附图对本发明进一步说明。
图1为实施例1制备的In2S3-TiO2/电纺纤维复合材料的扫描电镜图;
图2为XRD图,(a)为实施例1制备的In2S3-TiO2/电纺纤维复合材料,(b)为PVDF/SMA电纺纤维;
图3为实施例1制备的In2S3-TiO2/电纺纤维复合材料的XPS分析图片;
图4为UV-Vis图谱,(a)为PVDF/SMA电纺纤维,(b)为实施例1制备的In2S3-TiO2/电纺纤维复合材料;
图5为氙灯模拟光催化降解甲基橙图谱,(a)为PVDF/SMA电纺纤维,(b)为DegussaP25,(c)为In2S3-TiO2异质结粉体,(d)为实施例1制备的In2S3-TiO2/电纺纤维复合材料;
图6为不同循环周期光催化产氢图,(a)为In2S3-TiO2异质结粉体,(b)为实施例1制备的In2S3-TiO2/电纺纤维复合材料。
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)将0.41g SMA和3.6g PVDF加入到带搅拌和N2保护的三口烧瓶中,溶于三口烧瓶中的14ml丙酮和20ml DMAC,搅拌溶解24h,得到纺丝溶液。
(2)将步骤(1)得到的纺丝溶液在静电纺丝装置中制备得到PVDF/SMA电纺纤维毡,纺丝电压16kv,接收装置与喷丝头之间的收丝距离为15~25cm,纺丝溶液流速为0.4ml/h。
(3)将步骤(2)得到的0.45g PVDF/SMA电纺纤维毡浸到40ml 0.25mol/L的硫酸氧钛水溶液中,浸泡24h,放置到水热反应釜中,120℃反应14h,自然冷却至室温,洗涤,干燥,得到TiO2/电纺纤维毡。
(4)将步骤(3)得到的0.58g TiO2/电纺纤维浸到25ml 0.25mol/L浓度的硝酸铟水溶液中,加入25ml 0.5mol/L的硫代乙酰胺水溶液,浸泡24h,放置到水热反应釜中,120℃反应14h,自然冷却至室温,洗涤,干燥,得到In2S3-TiO2/电纺纤维复合光催化剂。利用同等条件制备In2S3-TiO2异质结粉体后备用。
实施例2
(1)将0.4g SMA和4.0g PVDF加入到带搅拌和N2保护的三口烧瓶中,溶于三口烧瓶中的15ml丙酮和22ml DMAC,搅拌溶解24h,得到纺丝溶液。
(2)将步骤(1)得到的纺丝溶液在静电纺丝装置中制备得到PVDF/SMA电纺纤维毡,纺丝电压16kv,接收装置与喷丝头之间的收丝距离为15~25cm,纺丝溶液流速为0.4ml/h。
(3)将步骤(2)得到的0.5g PVDF/SMA电纺纤维毡浸到50ml 0.5mol/L的硫酸氧钛水溶液中,浸泡24h,放置到水热反应釜中,120℃反应14h,自然冷却至室温,洗涤,干燥,得到TiO2/电纺纤维毡。
(4)将步骤(3)得到的0.74g TiO2/电纺纤维浸到25ml 0.5mol/L浓度的硝酸铟水溶液中,加入25ml 0.5mol/L的硫代乙酰胺水溶液,浸泡24h,放置到水热反应釜中,120℃反应14h,自然冷却至室温,洗涤,干燥,得到In2S3-TiO2/电纺纤维复合光催化剂。利用同等条件制备In2S3-TiO2异质结粉体后备用。
应用例一
In2S3-TiO2/电纺纤维复合材料光催化降解甲基橙
配置浓度为20.0mg/L的甲基橙水溶液250mL加入光化学反应仪中,为了能使催化剂较好地接受光照,将实施例制备的电纺纤维复合材料和含In2S3-TiO2异质结0.60g/L分别铺展在溶液中,使用氙灯模拟太阳光为光源照射,并磁力搅拌,用In2S3-TiO2/电纺纤维复合材料对浓度为20.0mg/L的甲基橙水溶液进行光催化降解。光催化降解后水溶液中甲基橙的浓度(C)用UV/VIS分光光度计在甲基橙的最大吸收波长λmax=465nm处测量,计算出(C/C0)%。由图5可知,In2S3-TiO2/电纺纤维复合材料降解甲基橙残余质量分数为3.2%,电纺纤维的降解残余质量为88.9%,In2S3-TiO2粉末的降解残余质量为38.8%,Degussa P25的降解残余质量为54.9%。由此可见In2S3-TiO2/电纺纤维复合材料的光催化降解甲基橙的效率远高于In2S3-TiO2异质结粉体,这是由于电纺纤维表面所负载的In2S3-TiO2异质结比表面积较大、光利用率较高。另外PVDF-SMA电纺纤维具有很强的吸附能力,使甲基橙容易吸附、迁移至复合材料的无机粒子表面,进行光催化降解甲基橙反应,并形成吸附-迁移-光催化降解的链条式反应。而In2S3-TiO2异质结粉体的吸附能力较弱,因此光降解效率低于表面反应。另外,In2S3-TiO2异质结粉体的降解速率明显高于Degussa P25,这是由于半导体异质结特殊的能带结构和载流子输送特性,使其呈现出较好的光催化活性。
应用例二
In2S3-TiO2/电纺纤维复合材料光催化水制氢
量取250mL的去离子水于光化学反应仪中,加入Na2S/Na2SO3(Na2S为0.10mol/L,Na2SO3为0.32mol/L)复合体系作为牺牲剂。为了能使催化剂较好地接受光照,将实施例制备的电纺纤维复合材料和含In2S3-TiO2异质结粉体0.60g/L分别铺展在水中,在同等条件下利用In2S3-TiO2异质结粉体(0.60g/L)进行光催化制氢。使用氙灯模拟可见光为光源照射,并磁力搅拌,用排水法收集产生的气体,每两个小时测量一次。最后以N2作为载气,使用气相色谱仪分析收集到的气体。由图6可知,In2S3-TiO2/电纺纤维复合材料光催化剂和In2S3-TiO2异质结粉体产生氢气共三个周期,从第一至第三周期,In2S3-TiO2异质结粉体的产氢量基本不变,而同等条件下In2S3-TiO2/电纺纤维复合材料的产氢量明显增加,表明该催化剂在可见光照射下有较好的重复稳定性;且复合材料在第三个周期中产氢的量是In2S3-TiO2异质结粉体的1.49倍,这是由于负载于电纺纤维表面的In2S3-TiO2比表面积大、光源利用率高。
以上述依据本发明的理想实施例为启示,通过上述的说明内容,相关工作人员完全可以在不偏离本项发明技术思想的范围内,进行多样的变更以及修改。本项发明的技术性范围并不局限于说明书上的内容,必须要根据权利要求范围来确定其技术性范围。
Claims (6)
1.一种In2S3-TiO2/电纺纤维复合光催化剂的制备方法,其特征是:包括静电纺丝法和水热法,具体为以下步骤:
(1)将苯乙烯-马来酸酐交替共聚物(SMA)和聚偏氟乙烯(PVDF)加入到带搅拌和N2保护的三口烧瓶中,溶于三口烧瓶中的丙酮和DMAC,搅拌溶解24h,得到纺丝溶液;
(2)将步骤(1)得到的纺丝溶液在静电纺丝装置中制备PVDF/SMA电纺纤维毡;
(3)将步骤(2)得到的PVDF/SMA电纺纤维毡浸到硫酸氧钛水溶液中,浸泡24h,然后于水热反应釜中,120℃反应14h,自然冷却至室温,洗涤,干燥,得到TiO2/电纺纤维毡;
(4)将步骤(3)得到的TiO2/电纺纤维毡浸到硝酸铟水溶液中,加入硫代乙酰胺水溶液,浸泡24h,然后于水热反应釜中,120℃反应14h,自然冷却至室温,洗涤,干燥,得到In2S3-TiO2/电纺纤维复合光催化剂。
2.根据权利要求1所述的一种In2S3-TiO2/电纺纤维复合光催化剂的制备方法,其特征是:所述的步骤(1)中苯乙烯-马来酸酐交替共聚物和聚偏氟乙烯的质量比为1:8~10,苯乙烯-马来酸酐交替共聚物和聚偏氟乙烯的总质量与丙酮的体积比为0.25~0.3g/ml,苯乙烯-马来酸酐交替共聚物和聚偏氟乙烯的总质量与DMAC的体积比为0.2~0.25g/ml。
3.根据权利要求1所述的一种In2S3-TiO2/电纺纤维复合光催化剂的制备方法,其特征是:所述的步骤(2)中纺丝条件为纺丝电压16kv,接收装置与喷丝头之间的收丝距离为15~25cm,纺丝溶液流速为0.4ml/h。
4.根据权利要求1所述的一种In2S3-TiO2/电纺纤维复合光催化剂的制备方法,其特征是:所述的步骤(3)中硫酸氧钛水溶液浓度为0.25~0.5mol/L,与PVDF/SMA电纺纤维毡的质量比为200~30:1。
5.根据权利要求1所述的一种In2S3-TiO2/电纺纤维复合光催化剂的制备方法,其特征是:所述的步骤(4)中硝酸铟水溶液的浓度为0.25~0.5mol/L,硫代乙酰胺水的浓度为0.5~1mol/L,TiO2/电纺纤维毡与硝酸铟水溶液的质量体积比为0.5~2.0g/25ml,TiO2/电纺纤维毡与硫代乙酰胺水的质量体积比为0.5~2.0g/25ml。
6.根据权利要求1所述的一种In2S3-TiO2/电纺纤维复合光催化剂的制备方法,其特征是:所述的步骤(3)和(4)中水热反应产物放置于去离子水中超声波洗涤3次,60℃真空干燥12h。
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