CN109320532B - 具有催化光降解偶氮染料功能的镉配合物及其制备方法和应用 - Google Patents
具有催化光降解偶氮染料功能的镉配合物及其制备方法和应用 Download PDFInfo
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Abstract
本发明属于配合物催化材料技术领域,具体涉及一种具有催化光降解偶氮染料功能的镉配合物及其制备方法和应用,所述的镉配合物为单核结构,其化学表达式为[Cd(Hpyz)2(phen)],式中H2pyz为5‑吡唑啉酮‑4‑甲酸乙酯,phen为邻菲罗啉。镉配合物是利用5‑吡唑啉酮‑4‑甲酸乙酯、邻菲罗啉和醋酸镉在溶剂热条件下合成,反应条件温和简单,产物稳定性高,有优良的催化活性。该镉配合物在常温下能高效地催化光降解亚甲基蓝(MB)和甲基橙(MO)两种偶氮染料,该催化剂可循环利用。
Description
技术领域
本发明属于配合物催化材料技术领域,具体涉及一种具有催化光降解偶氮染料功能的镉配合物及其制备方法和应用。
背景技术
水体污染是全世界人类面临的一个非常严肃的环境问题。特别是染料生产和使用的技术越来越成熟化对水体造成严重污染。据报道,全球每年的染料产量超过7×105吨,染料类别10000余种,其中大约10%的染料会从工业废水中排出(参见Chem.Eng.J.2008,144400-144406)。大多数染料含有偶氮基团,非常稳定且不可降解,因此常规的生物处理染料废水效果不佳,为了有效地从废水中去除染料,已经提出了许多物理和化学技术,包括离子交换、凝聚/絮凝、吸附、化学氧化、光催化等(参见RSC Adv.2015,5,98184-98193、Appl.Catal.B 2015,166,603–643和Appl.Catal.B 2016,19336-19346)。其中,光催化是基于原位生成具有高活性的·OH及O2 -,进一步将染料分解成CO2和H2O的一种理想的方法,具有反应条件温和、成本低和效率高的优点。
优良的光催化剂是催化光降解偶氮染料的关键因素,传统的半导体光催化剂(如金属氧化物、硫化物及其他金属盐)都可用于染料的降解(参见RSC Adv.2015,5,98184-98193、RSC Adv.2015,5,79556-79564和Catal.Commun.2015,61,62-66)。其中最受关注的就是金属氧化物TiO2,在紫外线下具有很强的氧化能力(参见Chem.Soc.Rev.2010,39,4206-4219),但是TiO2的禁带宽度较大(Eg=3.2eV),对太阳光谱中的紫外线利用率不超过4%,限制了它在降解染料中的应用(参见Chem.Rev.2007,107,2891-2959和Nanoscale2013,5,3601-3614)。CdS2、In2S3、Sb2S3、CoS2等硫化物是一类很好的半导体光催化剂(参见J.Am.Chem.Soc.2014,136,8895-8898和Appl.Catal.B 2016,186,19-29),但是这一类半导体光催化剂在降解染料的过程中容易形成二次污染,也限制了其在降解染料中的应用(参见Chem.Soc.Rev.2010,39,4206-4219)。与传统无机半导体光催化剂相比,配合物可以通过改变有机配体和中心金属离子对光学性能进行调控,且配合物的结构具有很高的稳定性,使其在催化光降解偶氮染料领域有巨大的发展前景。目前,一些配合物已经用于有机污染物的光降解(参见Appl.Catal.B 2016,186,19-29)、Cr6+光还原(参见RSC Adv.2015,5,32531-32535和J.Hazard.Mater.2015,286,187-194)、催化产氢产氧等(参见J.SolidStateChem.2016,233,194-198和Nat.Commun.2016,7,11580)。因此,开发新型具有催化光降解偶氮染料功能的金属配合物对于治理和保护水体环境具有重要意义。
发明内容
本发明主要提供了一种具有催化光降解偶氮染料功能的镉配合物及其制备方法和应用,制备的镉配合物能高效地催化光降解亚甲基蓝(MB)和甲基橙(MO)两种偶氮染料,并可循环利用,为催化光降解有机染料提供了新选择。其技术方案如下:
一种具有催化光降解偶氮染料功能的镉配合物,其化学表达式为[Cd(Hpyz)2(phen)],式中H2pyz为5-吡唑啉酮-4-甲酸乙酯,phen为邻菲罗啉。所述镉配合物分子结构如下所示:
优选的,所述镉配合物的不对称结构单元由一个中心金属离子Cd2+、两个去质子化有机配体Hpyz-、一个邻菲罗啉配体phen组成,中心金属离子Cd2+采取六配位方式,配位原子分别为两个Hpyz-配体上的四个氧原子,以及phen上的两个氮原子。
上述具有催化光降解偶氮染料功能的镉配合物的制备方法,具体的为,将5-吡唑啉酮-4-甲酸乙酯和邻菲罗啉溶于乙醇、醋酸镉溶于蒸馏水,然后将两种溶液混合均匀,于密闭烘箱加热反应,反应结束后,冷却至室温,得具有催化光降解偶氮染料功能的镉配合物。
优选的,5-吡唑啉酮-4-甲酸乙酯、邻菲罗啉、醋酸镉的摩尔比为(1.5-2):1:1。
优选的,乙醇与蒸馏水的体积比为(1-2):1。
优选的,烘箱温度为80~90℃,反应时间为1~2天。
上述镉配合物在催化光降解偶氮染料中的应用,所述偶氮染料为亚甲基蓝MB和甲基橙MO。
采用上述方案,本发明具有以下优点:
本发明所述的具有催化光降解偶氮染料功能的镉配合物,合成方法简单高效、能耗低,为基于吡唑衍生物有机配体合成金属配合物提供了一定的依据。所述的具有催化光降解偶氮染料功能的镉配合物能高效地催化光降解亚甲基蓝(MB)和甲基橙(MO)两种偶氮染料,并可循环利用,为催化光降解有机染料提供了新选择。
附图说明
图1是本发明的具有催化光降解偶氮染料功能的镉配合物的镉属离子配位环境图;
图2是本发明的具有催化光降解偶氮染料功能的镉配合物催化光降解亚甲基蓝的紫外吸收光谱图;
图3是本发明的具有催化光降解偶氮染料功能的镉配合物催化光降解亚甲基蓝的浓度变化速率图;
图4是本发明的具有催化光降解偶氮染料功能的镉配合物催化光降解亚甲基蓝5次循环浓度变化速率图;
图5是本发明的具有催化光降解偶氮染料功能的镉配合物催化光降解亚甲基蓝的PXRD图;
图6是本发明的具有催化光降解偶氮染料功能的镉配合物催化光降解甲基橙的紫外吸收光谱图;
图7是本发明的具有催化光降解偶氮染料功能的镉配合物催化光降解甲基橙的浓度变化速率图;
图8是本发明的具有催化光降解偶氮染料功能的镉配合物催化光降解甲基橙5次循环浓度变化速率图;
图9是本发明的具有催化光降解偶氮染料功能的镉配合物催化光降解甲基橙的PXRD图。
具体实施方式
以下实施例中的实验方法如无特殊规定,均为常规方法,所涉及的实验试剂及材料如无特殊规定均为常规生化试剂和材料。
实施例1
本实施例具有催化光降解偶氮染料功能的镉配合物的制备方法如下:
称取5-吡唑啉酮-4-甲酸乙酯(0.15mmol,0.0231g)和邻菲罗啉(0.1mmol,0.0198g)溶于2mL乙醇,制得配体溶液。称取醋酸镉(0.1mmol,0.0270g)溶于1mL蒸馏水,将醋酸镉溶液倒入配体溶液中,混合均匀,于80℃烘箱反应1天;反应结束后,自然冷却至室温,过滤,洗涤,风干,得目标化合物。产率:63%。对产物进行红外表征,具体结果为:IR(KBr,cm-1):3218(w),1652(s),1629(s),1554(m),1517(m),1444(m),1315(m),1207(w),1133(s),1025(w),916(m),846(w),784(m),723(w),640(w),598(w)。
实施例2
本实施例具有催化光降解偶氮染料功能的镉配合物的制备方法如下:
称取5-吡唑啉酮-4-甲酸乙酯(0.15mmol,0.0231g)和邻菲罗啉(0.1mmol,0.0198g)溶于2mL乙醇,制得配体溶液。称取醋酸镉(0.1mmol,0.0270g)溶于2mL蒸馏水,将醋酸镉溶液倒入配体溶液中,混合均匀,于80℃烘箱反应2天;反应结束后,冷却至室温,过滤,洗涤,风干,得目标化合物。产率:59%。对产物进行红外表征,具体结果为:IR(KBr,cm-1):3215(w),1650(s),1631(s),1557(m),1515(m),1441(m),1311(m),1202(w),1139(s),1028(w),911(m),848(w),785(m),718(w),643(w),596(w)。
红外测试结果表明,本实施例的产物与实施例1的产物相同。
实施例3
本实施例具有催化光降解偶氮染料功能的镉配合物的制备方法如下:
称取5-吡唑啉酮-4-甲酸乙酯(0.20mmol,0.0312g)和邻菲罗啉(0.1mmol,0.0198g)溶于2mL乙醇,制得配体溶液。称取醋酸镉(0.1mmol,0.0270g)溶于1mL蒸馏水,将醋酸镉溶液倒入配体溶液中,混合均匀,于90℃烘箱反应1天;反应结束后,冷却至室温,过滤,洗涤,风干,得目标化合物。产率:67%。对产物进行红外表征,具体结果为:IR(KBr,cm-1):3222(w),1655(s),1633(s),1550(m),1511(m),1447(m),1313(m),1205(w),1128(s),1029(w),907(m),837(w),785(m),719(w),644(w),606(w)。
红外测试结果表明,本实施例的产物与实施例1的产物相同。
实施例4
本实施例具有催化光降解偶氮染料功能的镉配合物的制备方法如下:
称取5-吡唑啉酮-4-甲酸乙酯(0.20mmol,0.0312g)和邻菲罗啉(0.1mmol,0.0198g)溶于2mL乙醇,制得配体溶液。称取醋酸镉(0.1mmol,0.0270g)溶于2mL蒸馏水,将醋酸镉溶液倒入配体溶液中,混合均匀,于90℃烘箱反应2天;反应结束后,冷却至室温,过滤,洗涤,风干,得目标化合物。产率:61%。对产物进行红外表征,具体结果为:IR(KBr,cm-1):3216(w),1655(s),1633(s),1553(m),1514(m),1447(m),1317(m),1203(w),1130(s),1026(w),916(m),849(w),781(m),720(w),643(w),602(w)。
红外测试结果表明,本实施例的产物与实施例1的产物相同。
实施例5
图1为实施例1制备的镉配合物的镉属离子配位环境图。
表1为Cd配合物的晶体学数据
Cd1-O1 | 2.227(2) | Cd1-O2A | 2.322(3) |
Cd1-O1A | 2.227(2) | Cd1-N3 | 2.359(2) |
Cd1-O2 | 2.322(3) | Cd1-N3A | 2.359(2) |
表3为Cd配合物的晶体键角(°)
O1-Cd1-O1A | 101.75(8) | O1-Cd1-N3 | 95.35(8) |
O1-Cd1-O2A | 87.98(8) | O1A-Cd1-N3A | 95.35(8) |
O1A-Cd1-O2 | 87.98(8) | O2-Cd1-N3 | 81.39(8) |
O1-Cd1-O2 | 86.66(8) | O2A-Cd1-N3A | 81.39(8) |
O1A-Cd1-O2A | 86.66(8) | O2-Cd1-N3A | 105.69(8) |
O2-Cd1-O2A | 171.51(7) | O2A-Cd1-N3 | 105.69(8) |
O1A-Cd1-N3 | 159.29(8) | N3A-Cd1-N3 | 70.81(8) |
O1-Cd1-N3A | 159.29(8) |
实施例6
镉配合物催化光降解亚甲基蓝实验:
采用氙灯作为紫外光源,采用实施例1获得的具有催化光降解偶氮染料功能的镉配合物进行催化光降解亚甲基蓝的反应,亚甲基蓝的分子式如下所示:
取50mL浓度为5mg/L的亚甲基蓝水溶液于石英反应罐中,加入30mg实施例1获得的具有催化光降解偶氮染料功能的镉配合物,在黑暗环境下搅拌30min。达到吸附-解吸平衡后,取样一次。然后以氙灯作为紫外光源进行催化光降解反应,每隔20min取样一次,共取样10次,取出的悬浊液经10000r/min的转速离心4min后取上层清液测其紫外可见吸收光谱(图2)。结果表明,催化光降解200min后,镉配合物对亚甲基蓝的降解率为82.22%(图3)。PXRD测试结果显示,经过5次循环后,具有催化光降解偶氮染料功能的镉配合物结构没有发生明显变化(图4),且催化效果基本不发生变化(图5),说明该镉配合物具有高稳定性,可以高效催化光降解亚甲基蓝,并可循环利用。
实施例7
镉配合物催化光降解甲基橙实验:
采用氙灯作为紫外光源,采用实施例1获得的具有催化光降解偶氮染料功能的镉配合物进行催化光降解甲基橙的反应,甲基橙的分子式如下所示:
取50mL浓度为5mg/L的甲基橙水溶液于石英反应罐中,加入30mg实施例1获得的具有催化光降解偶氮染料功能的镉配合物,在黑暗环境下搅拌30min。达到吸附-解吸平衡后,取样一次。然后以氙灯作为紫外光源进行催化光降解反应,每隔20min取样一次,共取样10次,取出的悬浊液经10000r/min的转速离心4min后取上层清液测其紫外可见吸收光谱(图6)。结果表明,催化光降解200min后,镉配合物对甲基橙的降解率为93.60%(图7)。PXRD测试结果显示,经过5次循环后,具有催化光降解偶氮染料功能的镉配合物结构没有发生明显变化(图8),且催化效果基本不发生变化(图9),说明该镉配合物具有高稳定性,可以高效催化光降解甲基橙,并可循环利用。
对本领域的技术人员来说,可根据以上描述的技术方案以及构思,做出其它各种相应的改变以及形变,而所有的这些改变以及形变都应该属于本发明权利要求的保护范围之内。
Claims (8)
3.根据权利要求1所述的具有催化光降解偶氮染料功能的镉配合物,其特征在于:所述镉配合物的不对称结构单元由一个中心金属离子Cd2+、两个去质子化有机配体Hpyz-、一个邻菲罗啉配体phen组成,中心金属离子Cd2+采取六配位方式,配位原子分别为两个Hpyz-配体上的四个氧原子,以及phen上的两个氮原子。
4.一种如权利要求1所述的具有催化光降解偶氮染料功能的镉配合物的制备方法,其特征在于:将5-吡唑啉酮-4-甲酸乙酯和邻菲罗啉溶于乙醇、醋酸镉溶于蒸馏水,然后将两种溶液混合均匀,于密闭烘箱加热反应,反应结束后,冷却至室温,得具有催化光降解偶氮染料功能的镉配合物。
5.根据权利要求4所述的具有催化光降解偶氮染料功能的镉配合物的制备方法,其特征在于:5-吡唑啉酮-4-甲酸乙酯、邻菲罗啉、醋酸镉的摩尔比为(1.5-2):1:1。
6.根据权利要求4所述的具有催化光降解偶氮染料功能的镉配合物的制备方法,其特征在于:乙醇与蒸馏水的体积比为(1-2):1。
7.根据权利要求4所述的具有催化光降解偶氮染料功能的镉配合物的制备方法,其特征在于:烘箱温度为80~90℃,反应时间为1~2天。
8.权利要求1所述的镉配合物在催化光降解亚甲基蓝MB和甲基橙MO中的应用。
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