CN113145109A - 一种室温催化剂在染料废水降解中的应用 - Google Patents
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Abstract
本发明公开了一种室温催化剂在染料废水降解中的应用,该室温催化剂化学式为Mn0.6Ce0.4O2,其制备特点是,以水为溶剂,在搅拌条件下加入六水合硝酸铈、高锰酸钾和盐酸,经过水热反应后离心洗涤干燥,通过低温煅烧即可制备出Mn0.6Ce0.4O2催化剂。该室温催化剂的制备方法环保,简单,成本低廉,产品纯净,在室温条件下能够很好去除染料废水中的残渣污染物,该催化剂具有良好的应用前景。
Description
技术领域
本发明涉及工业废水处理领域,具体涉及一种室温催化剂在染料废水降解中的应用。
背景技术
染料废水是主要的有害工业废水之一,严重影响了人类的生存与健康。通常,有机染料污染物含有稳定的多环芳烃。因此,传统的物理方法不能有效地降解这些染料污染物。染料污染物虽然可以通过光催化氧化技术、湿式空气氧化技术等化学方法完全分解,但是传统的光催化技术,需要利用人工光源设备来达到很强的光强度,这不可避免地增加了成本。传统的湿式空气氧化技术往往需要在高温、高压下进行,则消耗大量能源,设备成本增加。故急需一种在室温条件下可以高效降解染料废水的催化剂,既不需要消耗的化石能源,也不需要额外的光源设备。铈锰氧化物材料具有丰富的表面氧空位,被广泛应用于氧化挥发性有机物和CO等有毒气体的降解净化。但是在染料废水领域中应用较少。在已有的报道中,徐洁等人报道了离子液体二乙胺甲酸盐在亚甲蓝染料光降解方面的应用(申请公布号:CN108686703B),该文采用了典型的光催化技术,用离子液体二乙胺甲酸盐降解了亚甲基蓝,需要的额外的光源设备,成本较高。调研表明,目前尚未有铈锰氧化物在室温条件下催化降解染料废水的报道。
发明内容
本发明的目的是提供一种室温催化剂在染料废水降解中的应用,本发明通过一种简单的水热反应制备了Mn0.6Ce0.4O2催化剂,该催化剂在室温下,可以高效降解染料废水。
为实现上述目的,本发明提供的技术方案是:
一种室温催化剂在染料废水降解中的应用,通过氧化还原沉淀法和水热法相结合制备Mn0.6Ce0.4O2催化剂,所制备的Mn0.6Ce0.4O2催化剂用于降解染料废水中的残渣污染物。
其中Mn0.6Ce0.4O2催化剂的制备步骤为:
a)在搅拌条件下,向水中加入六水合硝酸铈;
b)向步骤a)的反应物溶液中加入高锰酸钾和盐酸,搅拌一段时间;
c)将步骤b)的混合溶液加入到聚四氟乙烯内衬中,在恒温水热条件下反应10-14小时;
d)将水热反应物经过离心、洗涤、干燥,并在330-370℃的温度下煅烧3-5小时,产物即为Mn0.6Ce0.4O2。
作为优选的方案,向步骤a)的反应物溶液中加入高锰酸钾和盐酸后,搅拌15-25min。
作为优选的方案,步骤c)中,恒温水热反应温度为100℃,在100℃恒温水热条件下反应12小时。
作为优选的方案,步骤d)中,经过离心、洗涤、干燥的水热反应物在350℃的温度下煅烧4小时,
作为优选的方案,六水合硝酸铈与高锰酸钾的加入质量比为(1.6-2.2):1。
作为优选的方案,步骤b)中,加入的高锰酸钾和浓盐酸的加入质量/体积比为(8-10):(15-25)g/ml。
作为优选的方案,所制备的Mn0.6Ce0.4O2催化剂用于降解含亚甲基蓝MB的染料废水。
与现有技术相比,本发明的有益效果是:
本发明制备的Mn0.6Ce0.4O2催化剂材料,其制作方法简易、成本低廉、重现性好,在室温下能够有效的降解含亚甲基蓝(MB)的染料废水。本发明的降解方法不需要加热,因此不消耗化石能源,成本低,本发明具有显著的应用前景。
附图说明
图1:实施例1制备的Mn0.6Ce0.4O2催化剂的X射线衍射(XRD)图。
图2:实施例1制备的Mn0.6Ce0.4O2催化剂的扫描电子显微镜(SEM)图。
图3:实施例2制备的Mn0.6Ce0.4O2催化剂对含亚甲基蓝MB的染料废水的降解图。
具体实施方式
以下通过实施例的形式对本发明的上述内容再作进一步的详细说明,但不应将此理解为本发明上述主题的范围仅限于以下的实施例,凡基于本发明上述内容所实现的技术均属于本发明的范围。
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,所用的试剂、方法和设备,如无特殊说明均为本技术领域常规试剂、方法和设备。
本发明提供了一种室温催化剂在染料废水降解中的应用,通过氧化还原沉淀法和水热法相结合制备Mn0.6Ce0.4O2催化剂,所制备的Mn0.6Ce0.4O2催化剂用于降解染料废水中的残渣污染物。
实施例1
室温下,在烧杯中,将0.4118g的六水合硝酸铈加入盛有20mL水溶液的烧杯中,搅拌5分钟后,加入0.225g的高锰酸钾和0.5ml浓盐酸,搅拌20分钟,转移到聚四氟乙烯内衬中,100℃恒温水热反应12小时;洗涤、离心、干燥,产物放到马弗炉中,350℃恒温煅烧反应4小时,即得到Mn0.6Ce0.4O2。
实施例2
室温催化剂在染料废水降解中的应用测试过程如下:
将实施例1制得到的Mn0.6Ce0.4O2催化剂,用于降解含亚甲基蓝MB的染料废水。
称取样品50mg,加入100mlMB水溶液,其中MB浓度为4.5mg/L,先低温6℃搅拌30min,使染料在催化剂表面达到吸附/脱附平衡。然后放入35℃的水浴锅中进行催化反应,上清液用分光光度计检测。根据Lambert–Beer定律,有机物特征吸收峰强度的变化,可以定量计算其浓度变化。当吸光物质相同、厚度相同时,可以用吸光度的变化直接表示溶液浓度的变化。因为MB在663nm处有一个特征吸收峰,所以可以利用吸光度的变化来衡量溶液中MB的浓度变化。从图3可以看出,Mn0.6Ce0.4O2催化剂可以在仅室温搅拌的情况下,便可有效地降解MB。同时也表明通过Mn0.6Ce0.4O2催化剂来催化降解染料废水是切实可行的,成本低廉、操作简便、低温节能且无二次污染。
图1为实施例1制备的Mn0.6Ce0.4O2催化剂的X射线衍射(XRD)图。由图1可见,实施例1制备的产品分别与原始CeO2标准卡(JCPDS:34-0394)和MnO2标准卡(JCPDS:80-1098)相关,实施例1制备产品是纯相的Mn0.6Ce0.4O2催化剂。
图2为实施例1制备的Mn0.6Ce0.4O2催化剂的扫描电子显微镜(SEM)图。由图2可见,实施例1所制备的Mn0.6Ce0.4O2催化剂形貌为非晶态颗粒。
图3为实施例2制备的Mn0.6Ce0.4O2催化剂对含亚甲基蓝MB的染料废水的降解图。由图3可见Mn0.6Ce0.4O2催化剂在室温搅拌的情况下,就可以有效的催化降解亚甲基蓝。
以上所述,仅是本发明的较佳实施例,并非对本发明作任何形式上的限制,任何熟悉本专业的技术人员,在不脱离本发明技术方案范围内,依据本发明的技术实质,对以上实施例所作的任何简单的修改、等同替换与改进等,均仍属于本发明技术方案的保护范围之内。
Claims (8)
1.一种室温催化剂在染料废水降解中的应用,其特征在于:通过氧化还原沉淀法和水热法相结合制备Mn0.6Ce0.4O2催化剂,所制备的Mn0.6Ce0.4O2催化剂用于降解染料废水中的残渣污染物。
2.根据权利要求1所述的室温催化剂在染料废水降解中的应用,其特征在于:其中Mn0.6Ce0.4O2催化剂的制备步骤为:
a)在搅拌条件下,向水中加入六水合硝酸铈;
b)向步骤a)的反应物溶液中加入高锰酸钾和盐酸,搅拌一段时间;
c)将步骤b)的混合溶液加入到聚四氟乙烯内衬中,在恒温水热条件下反应10-14小时;
d)将水热反应物经过离心、洗涤、干燥,并在330-370℃的温度下煅烧3-5小时,产物即为Mn0.6Ce0.4O2。
3.根据权利要求2所述的室温催化剂在染料废水降解中的应用,其特征在于:向步骤a)的反应物溶液中加入高锰酸钾和盐酸后,搅拌15-25min。
4.根据权利要求2所述的室温催化剂在染料废水降解中的应用,其特征在于:步骤c)中,恒温水热反应温度为100℃,在100℃恒温水热条件下反应12小时。
5.根据权利要求2所述的室温催化剂在染料废水降解中的应用,其特征在于:步骤d)中,经过离心、洗涤、干燥的水热反应物在350℃的温度下煅烧4小时。
6.根据权利要求2所述的室温催化剂在染料废水降解中的应用,其特征在于:六水合硝酸铈与高锰酸钾的加入质量比为(1.6-2.2):1。
7.根据权利要求2所述的室温催化剂在染料废水降解中的应用,其特征在于:步骤b)中,加入的高锰酸钾和浓盐酸的加入质量/体积比为(8-10):(15-25)g/ml。
8.根据权利要求1所述的室温催化剂在染料废水降解中的应用,其特征在于:所制备的Mn0.6Ce0.4O2催化剂用于降解含亚甲基蓝MB的染料废水。
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