CN112044453A - 一种超薄Bi4O5I2纳米片催化剂及其制备方法与应用 - Google Patents
一种超薄Bi4O5I2纳米片催化剂及其制备方法与应用 Download PDFInfo
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Abstract
本发明公开了一种超薄Bi4O5I2纳米片催化剂及其制备方法与应用。该超薄Bi4O5I2纳米片催化剂通过简易的室温共结晶法制备,包括如下制备步骤:(1)在水中加入氨水,搅拌,得到溶液A;(2)将一定量的碘化钾或碘化钠加入到上述溶液A,搅拌一段时间,得到溶液B;(3)将铋盐溶于稀醋酸溶液,并逐滴加入溶液B中,搅拌过夜,得到悬浊液C;(4)悬浊液C经离心、水洗、干燥后即可得到所述催化剂。本发明在中性室温可见光照条件下对难降解有毒有害有机污染物就具有很高的去除效率及光稳定性,且具有很好的固液分离效果。
Description
技术领域
本发明属于水处理功能材料领域,具体涉及一种超薄Bi4O5I2纳米片催化剂及其制备方法与应用。
背景技术
近年来,新兴污染物不断出现,包括医药品和个人护理品、农药、内分泌干扰素等物质,这些物质进入水体,经不断积累和富集,对水环境造成了严重的污染,水中污染物经过层层食物链最终危害人类的生命健康。有研究表明这些有机污染物及其代谢产物不仅具有毒性而且大多具有持久性和顽固性,利用传统物理化学手段或生物降解等水处理技术难以将其有效去除。
多相光催化氧化技术是一种不需要外加氧化剂的新型绿色节能水处理技术。目前阻碍该技术应用的瓶颈问题主要是:太阳能的利用率低,太阳能中紫外部分仅占4%,而可见光部分占43%,常规TiO2光催化剂仅能吸收紫外光,为了拓宽催化剂的光吸收范围,可见光催化剂得到了长足的发展,但目前国内外研制的可见光催化剂要么光催化效率低,要么光催化稳定性差,易于发生光腐蚀,这严重限制了可见光催化剂在实际水处理中的应用。
光催化剂的表面性质对于光生电荷的分离转移、污染物及其降解中间产物等分子在催化剂表面的吸脱附起着非常关键的作用。原子或分子级厚度的二维片状纳米材料相比块体材料具有比表面积更大、活性位点更多、电荷分离更快的特性。因此,开发高效稳定的二维纳米可见光催化剂对于水处理实际应用意义重大。
发明内容
本发明的目的是提供一种高活性、稳定可循环利用的超薄Bi4O5I2纳米片催化剂及其制备方法与应用,该催化剂为超薄Bi4O5I2纳米片(厚度约5nm),通过简易的室温共结晶法制备,Bi4O5I2表面形成氧空位,促使表面光生电荷快速分离并迁移到表面发生反应,相比标准可见光催化剂N-TiO2和溶剂热法制备的Bi4O5I2薄片,其光催化效率分别提高了9.5和2.5倍。此外,实验证明超薄Bi4O5I2纳米片在光照下非常稳定,易于分离、可循环利用。解决目前可见光催化体系存在的催化活性差、太阳能转化效率低以及光稳定性差等问题。
本发明提供的超薄Bi4O5I2纳米片催化剂的制备方法,包括如下步骤:
(1)在水中加入氨水,搅拌,得到溶液A;
(2)将一定量的碘化钾或碘化钠加入到上述溶液A,搅拌一段时间,得到溶液B;
(3)将铋盐溶于稀醋酸溶液,并逐滴加入溶液B中,搅拌过夜,得到悬浊液C;
(4)悬浊液C经离心、水洗、干燥后得到所述超薄Bi4O5I2纳米片催化剂。
上述的制备方法,步骤(1)中,每148mL水中加入2~2.3ml的氨水,具体可为每148mL水中加入2.3ml氨水;所述搅拌的转速可为450~700转/分钟,具体可为450转/分钟。
上述的制备方法,步骤(2)中,所述碘化钾或碘化钠的摩尔量为0.4~0.6mmol,具体可为0.6mmol;所述搅拌的转速可为450~700转/分钟,具体可为450转/分钟,时间可为30~50分钟,具体可为40分钟。
上述的制备方法,步骤(3)中,所述铋盐稀醋酸溶液与所述溶液B的体积比为1:(10~18),具体可为1:15;所述铋盐稀醋酸溶液中,以五水合硝酸铋计,所述铋盐的质量体积浓度为0.02~0.03g/mL,具体可为0.025g/mL,所述铋盐可为硝酸铋(具体可以五水合硝酸铋的形式进行添加)或氯化铋。
上述的制备方法,步骤(3)中,所述搅拌过夜在温度25~35℃(如25℃)的条件下进行,转速可为450~700转/分钟,具体可为450转/分钟,时间可为10~16小时,具体可为15小时。
上述的制备方法,步骤(4)中,所述离心的转速可为5000~8000rpm条件下进行,具体可为8000rpm,时间可为3~6分钟,具体可为3分钟;所述水洗的次数可为5~8遍,具体可为6遍,洗至pH值中性为宜;所述干燥在常规空气条件下,温度可为50~70℃,具体可为60℃,时间可为8~10小时,具体可为8小时。
上述的制备方法,所述方法在步骤(4)中所述干燥之后还包括将所述催化剂研磨,得粉末的步骤。
由上述的制备方法制备得到的超薄Bi4O5I2催化剂,也在本发明的保护范围内,该催化剂是一种橙黄色的固体粉末;超薄Bi4O5I2纳米片的厚度约为5nm,表面存在大量氧空位;需在液体环境中与太阳光或人工光照联合使用(光照具体也可为波长大于400纳米的可见光),形成光催化体系。
超薄Bi4O5I2纳米片催化剂在下述1)-3)中的至少一种的应用,也在本发明的保护范围内:
1)高效处理不同类型有机污染物;
2)增强在有机污染物处理过程中耐光腐蚀、可重复循环利用能力;
3)提高有机污染物处理后Bi4O5I2的固液分离能力。
上述的应用中,所述有机污染物可为苯酚、双酚A、2-氯酚、磺胺甲恶唑、环丙沙星、双氯芬酸的任一种。
上述的应用中,所述有机污染物的浓度可为5~100mg/L。
本发明与现有光催化体系相比具有以下优势:
(1)本发明去除有机污染物的效率很高,相比标准可见光催化剂N-TiO2和溶剂热法制备的Bi4O5I2纳米片,其光催化效率分别提高了9.5和2.5倍。;
(2)本发明在去除有机污染物的过程中具有很好的稳定性,无明显结构变化;
(3)本发明制备方法简易,只需室温搅拌即可,且没有贵金属等掺杂,成本低廉,操作简单。
附图说明
图1为实施例1中制备得到的超薄Bi4O5I2纳米片的XRD谱图。
图2为实施例1中制备得到的超薄Bi4O5I2纳米片的扫描电镜的照片。
图3为实施例1中制备得到的超薄Bi4O5I2纳米片的电子自旋共振谱图。
图4为实施例1中制备得到的超薄Bi4O5I2纳米片对于2-氯酚的催化去除效果。
图5为实施例1中制备得到的超薄Bi4O5I2纳米片对于2-氯酚降解的循环反复利用活性评价图。
具体实施方式
下述实施例中所使用的实验方法如无特殊说明,均为常规方法。
下述实施例中所用的材料、试剂等,如无特殊说明,均可从商业途径得到。
实施例1、可见光催化剂的制备及应用实验
一、制备
按照如下步骤制备超薄Bi4O5I2纳米片催化剂:
(1)将2.3mL氨水加入到148mL超纯水中,搅拌(转速为450转/分钟),形成溶液A;
(2)将0.6mmol碘化钾或碘化钠加入到上述溶液A,搅拌40分钟(转速为450转/分钟),得到溶液B;
(3)将0.25g五水合硝酸铋(Bi(NO3)3·5H2O)溶入10mL稀醋酸溶液中,并将该溶液逐滴加入溶液B中,搅拌过夜(搅拌时间15小时,转速为450转/分钟),得到悬浊液C;
(4)将悬浊液C,8000rpm离心,并用超纯水清洗至中性(约洗涤6遍,每次离心时间3分钟),60℃烘箱干燥8小时,在玛瑙研钵中充分研磨成粉末,即得到目标材料—超薄Bi4O5I2纳米片催化剂。
对比例1、
按照如下步骤制备Bi4O5I2薄片(溶剂热法):
(1)将0.728g五水合硝酸铋(Bi(NO3)3·5H2O)和0.498g碘化钾(KI)在室温搅拌下顺序溶入35mL乙二醇中,形成溶液A;
(2)用2mol/L的氢氧化钠(NaOH)将溶液A的pH值调至9,形成混合物B;
(3)将混合物B转移到45mL高压釜,150℃热处理12小时;冷却至室温后,离心,用超纯水和无水乙醇交替洗涤数次,60℃烘箱干燥,得到固体C;将固体C在玛瑙研钵中充分研磨成粉末即得到Bi4O5I2薄片。
对比例2、
按照如下步骤制备氮掺杂纳米二氧化钛(N-TiO2):
(1)将3.0mL硝酸加入到100mL超纯水中,形成溶液A;
(2)15mL钛酸四丁酯逐滴加入到溶液A中,剧烈搅拌4小时(转速为600转/分钟)后,得到半透明溶胶B;
(3)半透明溶胶B中加入30mL正丙醇,搅拌至半透明溶胶完全变成透明溶液后,加入尿素(25%w/v),混合均匀后,转移至100℃烘箱中,干燥得到固体C;
(4)将固体C研磨均匀后,转移至马弗炉中焙烧,升温速率5℃/min,在450℃下焙烧2小时,自然降至室温后形成固体D;将固体D在玛瑙研钵中充分研磨成粉末,即得到N-TiO2。
二、表征
图1为实施例1中制备得到的超薄Bi4O5I2纳米片、溶剂热法制备得到的Bi4O5I2薄片的XRD对比谱图,由该图可以看出,本实施例制备得到的催化剂具备明显的Bi4O5I2的特征晶面峰。
图2为实施例1中制备得到的超薄Bi4O5I2纳米片、溶剂热法制备得到的Bi4O5I2薄片的扫描电镜对比图,证实超薄Bi4O5I2纳米片的厚度约为5nm。
图3为实施例1中制备得到的超薄Bi4O5I2纳米片的电子自旋共振谱图,证实超薄Bi4O5I2纳米片表面存在大量氧空位。
三、应用实验
将0.1g上述合成的催化剂投入60mL污染物溶液中,避光条件下搅拌30分钟,待污染物和催化剂之间达到吸附平衡后,开始照光(氙灯,加420nm截止滤光片)反应,在不同的时间点取样检测污染物的浓度及TOC浓度。
图4反映了该催化剂与溶剂法得到的Bi4O5I2薄片和N-TiO2在中性、可见光照条件下对于2-氯酚的去除效果对比图。从图中可以看出,超薄Bi4O5I2纳米片可见光催化剂对于2-氯酚的催化降解速率分别是Bi4O5I2薄片和N-TiO2的2.5和9.5倍。
待可见光催化反应结束后将催化剂滤出并用去离子水洗去表面吸附的污染物,在60℃下烘干后,重复上面的可见光催化反应步骤,考察超薄Bi4O5I2纳米片可见光催化剂的循环反复利用活性。图5展示了该催化剂对于催化降解2-氯酚的循环反复利用活性评价图。从图中可以看出,催化剂循环使用5次,催化效果无明显变化,可以应用于实际水体的处理。
Claims (6)
1.一种超薄Bi4O5I2纳米片催化剂的制备方法,包括如下步骤:
(1)在水中加入氨水,搅拌,得到溶液A,其浓度为2~2.3mL氨水/148mL水;
(2)将一定量的碘化钾或碘化钠加入到上述溶液A,搅拌一段时间,得到浓度为2.7~4.0mmol/L的含碘盐溶液B;
(3)将铋盐溶于稀醋酸溶液,以五水合硝酸铋计,得到浓度为0.02~0.03g/mL的铋盐稀醋酸溶液,并逐滴加入溶液B中,在温度25~35℃的条件下搅拌过夜,得到悬浊液C;
(4)将悬浊液C离心、水洗、空气烘箱干燥后即可得到所述超薄Bi4O5I2催化剂;
铋盐的溶解介质为稀醋酸;其原料的投加顺序为碘化钾或碘化钠加入到溶液A的顺序,以及溶于稀醋酸的铋盐溶液加入到溶液B的顺序。
2.根据权利要求1所述的制备方法,其特征在于:步骤(1)中,所述搅拌的转速为450~700转/分钟。
3.根据权利要求1或2所述的制备方法,其特征在于:步骤(2)中,所述碘化钾或碘化钠的摩尔量为0.4~0.6mmol;所述搅拌的转速为450~700转/分钟,时间为30~50分钟。
4.根据权利要求3所述的制备方法,其特征在于:步骤(3)中,所述铋盐稀醋酸溶液与所述溶液B的体积比为1:(10~18);所述铋盐稀醋酸溶液中,以五水合硝酸铋计,所述铋盐的质量体积浓度为0.02~0.03g/mL,所述铋盐为硝酸铋或氯化铋;所述搅拌过夜在温度25~35℃的条件下进行,转速为450~700转/分钟,时间为10~16小时。
5.根据权利要求4所述的制备方法,其特征在于:步骤(4)中,所述干燥在空气条件下,温度为50~70℃,时间为8~10小时。
6.权利要求5所述的制备方法制备得到的超薄Bi4O5I2纳米片催化剂,该催化剂的特征在于:超薄Bi4O5I2纳米片(厚度约5nm),表面存在大量氧空位,易于固液分离。
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