CN110449160B - 用于电催化净化有机废水的掺杂钴酸镧材料及其制备方法 - Google Patents
用于电催化净化有机废水的掺杂钴酸镧材料及其制备方法 Download PDFInfo
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- QGUAJWGNOXCYJF-UHFFFAOYSA-N cobalt dinitrate hexahydrate Chemical compound O.O.O.O.O.O.[Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O QGUAJWGNOXCYJF-UHFFFAOYSA-N 0.000 claims abstract description 9
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Abstract
本发明公开了用于电催化净化有机废水的掺杂钴酸镧材料及其制备方法,具体方法为:1)取六水合硝酸镧,硝酸锶,六水合硝酸钴,硝酸锰,一水合柠檬酸,溶于去离子水中;调节pH,超声震荡;再搅拌,得到粘稠的溶胶,干燥;2)研磨得到粉末状前驱体,煅烧,自然冷却至室温,得到用于电催化净化有机废水的掺杂钴酸镧材料;硝酸锶和硝酸锰不同时为0。本发明工艺简单,条件可控,通过煅烧温度和时间来调节粒子的尺度。制备出的材料是在钴酸镧的基础上进行了元素掺杂,从而诱使氧空位的形成来提供更多的反应活性位点,提高其催化降解效率。制备出的材料为阳极涂覆层的活性材料适用于有机废水的电催化氧化处理,效果实验证明对污染物的降解效率高。
Description
技术领域
本发明涉及一种用于有机废水净化的掺杂钴酸镧材料及其制备方法,属于电催化电极材料的制备领域。
背景技术
随着工业的迅速发展,有机废水的不断产生和大量排放带来了严重的环境问题,其成分复杂,主要包括芳香族化合物,杂环化合物,氮化物,硫化物,重金属等。传统的废水处理技术均存在一定的局限性,如生化法处理周期长,占地面积大;吸附法中吸附剂的再生与后续处理的问题;萃取法只是污染物的转移而非降解,且存在有机溶剂的二次污染。
电催化氧化技术由于其具有无二次污染,无额外药剂添加,适用范围广,处理效率高,能耗相对降低,易于操作等特点而日益受到污水处理领域的关注与青睐,它主要通过电极表面产生的活性自由基如·OH氧化污染物使其降解成小分子的中间产物或者完全矿化为CO2和H2O。该技术的关键之处是开发出具有优良催化活性,结构稳定,造价低廉的阳极,而其降解效果又决定于基底表面涂覆层的活性材料。常规电极材料受到某些问题的制约而难以大规模使用,其中形状尺寸稳定电极(DSA)如Ti/RuO和Ti/IrO2容易被吸附的氮气污染而中毒失去活性,Ti/PbO2-Sb面临有毒重金属铅的渗漏问题,硼掺杂金刚石电极(BDD)制备工艺复杂,成本高昂。钙钛矿作为一种半导体材料,由于其具备良好的催化活性,优异的结构稳定性和灵活的电子转移能力,在太阳能电池,催化,传感领域得到了广泛研究与应用,而将其作为阳极涂敷材料进行污水的电催化氧化处理尚未见报道。
发明内容
本发明的目的是克服现有阳极材料存在的结构不稳定,催化活性不高,制备成本高昂等不足,提供一种用于电催化净化有机废水的掺杂钴酸镧材料。
本发明的第二个目的是提供一种用于电催化净化有机废水的掺杂钴酸镧材料的制备方法。
本发明的技术方案概述如下:
用于电催化净化有机废水的掺杂钴酸镧材料的制备方法,包括如下步骤:
1)按比例,称取六水合硝酸镧0.025~0.05mol,硝酸锶0~0.025mol,六水合硝酸钴0.025~0.05mol,硝酸锰0~0.025mol,一水合柠檬酸0.15mol,溶于50ml去离子水中;滴加氨水,调节pH到8~10,于25~30℃下超声震荡30~45min;再在70~90℃、在800~1000rpm,搅拌8~10h,得到粘稠的溶胶,在100~120℃的条件下干燥10~12h;
2)将步骤1)获得的产物研磨得到粉末状前驱体,从常温,以5~8℃/min,升温至300~400℃,保持3~4h,再以8~10℃/min,继续升温至700~850℃,保持2~3h,自然冷却至室温,得到用于电催化净化有机废水的掺杂钴酸镧材料;硝酸锶和硝酸锰不同时为0。
本发明的优点是:
1.本发明的制备采取溶胶-凝胶法,工艺简单,条件可控,可通过煅烧温度和时间来调节粒子的尺度。
2.制备出的材料是在钴酸镧的基础上进行了元素掺杂,从而诱使氧空位的形成来提供更多的反应活性位点,可以大大提高其催化降解效率。
3.制备出的材料为阳极涂覆层的活性材料适用于有机废水的电催化氧化处理,其结构稳定,可长期循环使用,有害离子的渗漏率低,效果实验证明对污染物的降解效率高。
附图说明
图1为所制备LaCoO3的XRD图(A)和FT-IR图(B)。
图2为实施例2制备的产物的SEM图(A)以及阳极材料Ti/实施例2的产物的外观图(B)。
图3为实施例3制备的产物的的元素分布图(A)以及EDS(B),其中A(1)为La,A(2)为Sr,A(3)为Co,A(4)为Mn,A(5)为O,A(6)表示观察元素分布时所选定的实际区域。
具体实施方式
下面结合具体实施例对本发明作进一步的说明。
实施例1
用于电催化净化有机废水的钴酸镧材料的制备方法,包括如下步骤:
1)称取六水合硝酸镧0.05mol,六水合硝酸钴0.05mol,一水合柠檬酸0.15mol,溶于50ml去离子水中;滴加氨水,调节pH到9,于28℃下超声震荡40min;再在80℃、在900rpm,搅拌9h,得到粘稠的溶胶,在110℃的条件下干燥11h;
2)将步骤1)获得的产物研磨得到粉末状前驱体,从常温,以5℃/min,升温至300℃,保持3h,再以10℃/min,继续升温至700℃,保持2h,自然冷却至室温,得到粉末状的用于电催化净化有机废水的钴酸镧材料。
用于电催化净化有机废水的钴酸镧材料LaCoO3的XRD如图1A所示,其出峰位置与标准图谱吻合度较高,说明目标物质已经成功合成出来,同时没有观察到杂峰的出现,表明合成的材料纯度较高。从图1B的FT-IR可以看到煅烧后的材料相比于前驱体,其有机官能团对应的峰强大幅度减弱甚至消失,并且610cm-1出现的所特有的金属-氧伸缩振动峰进一步证明了钴酸镧的成功合成。将合成出的LaCoO3与导电剂乙炔黑,粘结剂聚四氟乙烯按照8:1:1的质量比涂敷在钛板上作为阳极,在t=60min,i=20mAcm-2,pH=7,T=25℃,初始COD为515.5mg/L的条件下,对COD的去除率达到了69.29%。
实施例2
用于电催化净化有机废水的掺杂钴酸镧材料的制备方法,包括如下步骤:
1)称取六水合硝酸镧0.05mol,六水合硝酸钴0.03mol,硝酸锰0.02mol,一水合柠檬酸0.15mol,溶于50ml去离子水中;滴加氨水,调节pH到9,于28℃下超声震荡40min;再在80℃、在900rpm,搅拌9h,得到粘稠的溶胶,在110℃的条件下干燥11h;
2)将步骤1)获得的产物研磨得到粉末状前驱体,从常温,以5℃/min,升温至300℃,保持3h,再以10℃/min,继续升温至700℃,保持2h,自然冷却至室温,得到粉末状的用于电催化净化有机废水的掺杂钴酸镧材料。
本实施例获得的产品的SEM图见附图2A所示,呈现出类球形状,颗粒尺寸分布在20-50nm,表面呈现出大量纳米尺寸的孔隙,颗粒间孔隙度高,有利于污染物的转移和附着降解。观察到的多孔微观结构可能是柠檬酸热分解过程中产生的气体,比如水蒸气(H2O),NOx和CO2。阳极材料的外观图也如图2B所示,将合成出的本实施例的产物与导电剂乙炔黑,粘结剂聚四氟乙烯按照8:1:1的质量比涂敷在钛板上作为阳极,在t=60min,i=20mAcm-2,pH=7,T=25℃,初始COD为515.5mg/L的条件下,对COD的去除率达到了81.37%。
实施例3
用于电催化净化有机废水的掺杂钴酸镧材料的制备方法,包括如下步骤:
1)称取六水合硝酸镧0.035mol,硝酸锶0.015mol,六水合硝酸钴0.03mol,硝酸锰0.02mol,一水合柠檬酸0.15mol,溶于50ml去离子水中;滴加氨水,调节pH到9,于25℃下超声震荡45min;再在70℃、在1000rpm,搅拌10h,得到粘稠的溶胶,在100℃的条件下干燥12h;
2)将步骤1)获得的产物研磨得到粉末状前驱体,从常温,以5℃/min,升温至300℃,保持3h,再以10℃/min,继续升温至700℃,保持2h,自然冷却至室温,得到粉末状的用于电催化净化有机废水的掺杂钴酸镧材料。
图3A为本实施例制备的产品的元素分布图,可见均匀的分散着Sr,La,Mn,Co,O五种元素,说明元素的成功掺杂。根据图3B即EDS图所给出的原子数目比,计算出本实施例的产物实际化学组成为Sr0.33La0.67Mn0.44Co0.56O2.62,与按照摩尔投料比计算出来的化学组成Sr0.3La0.7Mn0.4Co0.6O3-δ相差不大。将合成出的本实施例的产物与导电剂乙炔黑,粘结剂聚四氟乙烯按照8:1:1的质量比涂敷在钛板上作为阳极,在t=60min,i=20mAcm-2,pH=7,T=25℃,初始COD为515.5mg/L的条件下,对COD的去除率达到了83.95%。
实施例4
用于电催化净化有机废水的掺杂钴酸镧材料的制备方法,包括如下步骤:
1)按比例,称取六水合硝酸镧0.025mol,硝酸锶0.025mol,六水合硝酸钴0.05mol,一水合柠檬酸0.15mol,溶于50ml去离子水中;滴加氨水,调节pH到8,于30℃下超声震荡30min;再在90℃、在800rpm,搅拌8h,得到粘稠的溶胶,在100℃的条件下干燥12h;
2)将步骤1)获得的产物研磨得到粉末状前驱体,从常温,以5℃/min,升温至300℃,保持4h,再以8℃/min,继续升温至700℃,保持3h,自然冷却至室温,得到用于电催化净化有机废水的掺杂钴酸镧材料;
将合成出的本实施例的产物与导电剂乙炔黑,粘结剂聚四氟乙烯按照8:1:1的质量比涂敷在钛板上作为阳极,在t=60min,i=20mAcm-2,pH=7,T=25℃,初始COD为515.5mg/L的条件下,对COD的去除率达到了75.36%。
实施例5
用于电催化净化有机废水的掺杂钴酸镧材料的制备方法,包括如下步骤:
1)按比例,称取六水合硝酸镧0.04mol,硝酸锶0.01mol,六水合硝酸钴0.025mol,硝酸锰0.025mol,一水合柠檬酸0.15mol,溶于50ml去离子水中;滴加氨水,调节pH到10,于25℃下超声震荡45min;再在70℃、在1000rpm,搅拌10h,得到粘稠的溶胶,在120℃的条件下干燥10h;
2)将步骤1)获得的产物研磨得到粉末状前驱体,从常温,以8℃/min,升温至400℃,保持3h,再以10℃/min,继续升温至850℃,保持2h,自然冷却至室温,得到用于电催化净化有机废水的掺杂钴酸镧材料;
将合成出的本实施例的产物与导电剂乙炔黑,粘结剂聚四氟乙烯按照8:1:1的质量比涂敷在钛板上作为阳极,在t=60min,i=20mAcm-2,pH=7,T=25℃,初始COD为515.5mg/L的条件下,对COD的去除率达到了78.64%。
实施例6
用于电催化净化有机废水的掺杂钴酸镧材料的制备方法,包括如下步骤:
1)按比例,称取六水合硝酸镧0.025mol,硝酸锶0.025mol,六水合硝酸钴0.04mol,硝酸锰0.01mol,一水合柠檬酸0.15mol,溶于50ml去离子水中;滴加氨水,调节pH到9,于28℃下超声震荡40min;再在80℃、在900rpm,搅拌9h,得到粘稠的溶胶,在110℃的条件下干燥11h;
2)将步骤1)获得的产物研磨得到粉末状前驱体,从常温,以7℃/min,升温至350℃,保持3.5h,再以9℃/min,继续升温至800℃,保持2.5h,自然冷却至室温,得到用于电催化净化有机废水的掺杂钴酸镧材料;
将合成出的本实施例的产物与导电剂乙炔黑,粘结剂聚四氟乙烯按照8:1:1的质量比涂敷在钛板上作为阳极,在t=60min,i=20mAcm-2,pH=7,T=25℃,初始COD为515.5mg/L的条件下,对COD的去除率达到了80.69%。
Claims (1)
1.用于电催化净化有机废水的掺杂钴酸镧材料的制备方法,其特征是包括如下步骤:
1)按比例,称取六水合硝酸镧0.025~0.05mol,硝酸锶0~0.025mol,六水合硝酸钴0.025~0.05mol,硝酸锰0.01、0.02或0.025mol,一水合柠檬酸0.15mol,溶于50ml去离子水中;滴加氨水,调节pH到8~10,于25~30℃下超声震荡30~45min;再在70~90℃、在800~1000rpm,搅拌8~10h,得到粘稠的溶胶,在100~120℃的条件下干燥10~12h;
2)将步骤1)获得的产物研磨得到粉末状前驱体,从常温,以5~8℃/min,升温至300~400℃,保持3~4h,再以8~10℃/min,继续升温至700~850℃,保持2~3h,自然冷却至室温,得到用于电催化净化有机废水的掺杂钴酸镧材料;
所述电催化净化有机废水的步骤为:将用于电催化净化有机废水的掺杂钴酸镧材料与导电剂乙炔黑,粘结剂聚四氟乙烯按照8:1:1的质量比涂敷在钛板上作为阳极,电催化净化有机废水。
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