CN106279007A - 一种银杯芳烃配合物单晶及其制备方法和应用 - Google Patents

一种银杯芳烃配合物单晶及其制备方法和应用 Download PDF

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CN106279007A
CN106279007A CN201610589191.9A CN201610589191A CN106279007A CN 106279007 A CN106279007 A CN 106279007A CN 201610589191 A CN201610589191 A CN 201610589191A CN 106279007 A CN106279007 A CN 106279007A
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刘雷雷
余彩霞
石云峰
邢云
陈静
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Abstract

本发明属配位化学和光催化领域,具体公开了一种银杯芳烃配合物单晶及其制备方法和应用。本发明配合物单晶通过将硝酸银、25,26,27,28‑四(吡啶‑3‑甲氧基)杯[4]芳烃与甲醇加入到硬质玻璃管中并封管水热法合成。其化学式为:[AgL0.5(NO3)],其中L=25,26,27,28‑四(吡啶‑3‑甲氧基)杯[4]芳烃;属于单斜晶系,空间群为C2/c,β=129.073(2)°,该配合物常温下具有稳定的光催化降解硝基苯性能,且催化活性好,具有很好的推广应用价值。

Description

一种银杯芳烃配合物单晶及其制备方法和应用
技术领域
本发明涉及配位化学和光催化领域,具体涉及一种具有催化光降解硝基苯的银配合物单晶及其制备方法和应用。
背景技术
硝基苯是一种剧毒化学品,是美国环保局、欧共体以及我国优先控制有毒有机污染物之一。此类化合物对人体及微生物的毒性极大,人体可通过吸入、食入、经皮肤吸收而产生毒性作用,主要引起高铁血红蛋白血症,可引起溶血及肝损害,还具有致癌、致畸、致突变等潜在毒性。该类化合物难溶于水,在水中具有极高的稳定性,为生物难降解化合物,所以造成水体污染会持续相当长的时间。由于其高度的稳定性和杀菌性,普通的生物、化学方法很难将其降解。因此含硝基化合物废水的处理一直是水处理研究中倍受关注的课题。
基于此,广大化学家开发了许多新颖的能够降解硝基苯的方法。其中,光催化降解硝基苯激起了人们的兴趣,因为此技术不仅能够有效地降解硝基苯,并且它的分解产物大多是无危害的无机物,不会造成二次污染。近年研究表明,功能配合物应用于光催化降解污染物,不仅能带宽带可调,可以增强功能配合物的吸光性能,而且可以有效分离光生电子和空缺。功能配合物的低维结构不仅可以增加材料的比表面积,同时可以提高物质的传输速率;功能配合物的金属离子和配体直接的相互作用可以有效改善分离光生电子-空缺,进而提高光催化反应活性。因此,利用配合物作为光催化剂是降解硝基苯的研究热点。目前光降解硝基苯的功能配合物没见相关文献报道。
发明内容
本发明目的在于提供一种稳定性好、催化光降解硝基苯活性好的银配合物单晶;另一目的是提供其制备方法和应用。
为实现本发明目的,本发明银配合物单晶通过下列方法制备获得:将硝酸银、25,26,27,28-四(吡啶-3-甲氧基)杯[4]芳烃与甲醇加入到硬质玻璃管中并封管,随后将玻璃管放入80-90℃烘箱中反应,然后以5℃/h的速率使玻璃管缓慢降温,温度降至室温后,即得到目标产物。
制备方法中硝酸银:25,26,27,28-四(吡啶-3-甲氧基)杯[4]芳烃的摩尔比例是2:1。
制备方法中甲醇加入量为4-5毫升。
该配合物作为催化剂在紫外光照射下,应用于降解硝基苯污染物。在用于光催化降解硝基苯的反应中具有较高的光反应催化活性,可使水中的硝基苯完全降解。
本发明配合物单晶的化学式为:[AgL0.5(NO3)],其中L=25,26,27,28-四(吡啶-3-甲氧基)杯[4]芳烃;属于单斜晶系,空间群为C2/c, β=129.073(2)°,
本发明优点在于:制备方法简单,收率较高,达67%以上。常温下具有稳定的光催化降解硝基苯性能,且催化活性好,紫外光照射下140分钟后硝基苯降解完全,且反复使用后仍具有较好的催化活性,具有很好的推广应用价值。
附图说明
图1为本发明银配合物晶体中银的配位环境图;
图2为本发明银配合物单晶结构图;
图3为本发明银配合物单晶粉末衍射图谱、单晶模拟粉末衍射图谱、光催化降解硝基苯后本发明银配合物单晶的粉末衍射图谱对比图;其中,1为单晶模拟,2为本发明银配合物单晶,3为第一次光催化降解硝基苯后本发明银配合物单晶的粉末衍射图谱;4为第三次光催化降解硝基苯后本发明银配合物单晶的粉末衍射图谱。
图4为本发明银配合物催化光降解硝基苯的吸光度变化图。
具体实施方式
下面通过实例对本发明做进一步的说明:
实施例1:合成银配合物单晶催化剂
将硝酸银(4mg,0.02mmol)和配体L(8mg,0.01mmol)溶解在甲醇(4mL)中,放入硬质玻璃管中并封管,烘箱中90℃恒温三天反应,然后以5℃/h的速率使玻璃管缓慢降温,降至室温,得到无色块状晶体,即为银配合物单晶催化剂。该无色块状晶体的分子式为:[AgL0.5(NO3)]。收率67%。
在显微镜下选取合适大小的单晶在室温下进行X–射线衍射实验。在BrukerSmartApex-II CCD衍射仪上,用经石墨单色器单色化的Mo–Kα射线 方式收集衍射数据。用Bruker SAINT程序进行数据还原。部分结构的衍射数据用SADABS程序进行吸收校正。晶体结构由直接法结合差值Fourier合成解出。全部非氢原子坐标及各向异性参数进行全矩阵最小二乘法修正,C–H原子位置按理论模式计算确定。配合物中金属银的配位环境图见图1;配合物的晶体结构图见图2;详细的晶体测定数据见表1。
表1配合物的主要晶体学数据
实施例2:本发明银配合物催化剂在光催化降解硝基苯中的具体应用
在60mL浓度约为5×10-4mol/L的硝基苯水溶液中加入20mg实施例1制得的无色块状晶体,在黑暗环境下搅拌30分钟。达到吸附-解吸平衡后,用氙灯350W紫外光进行顶部照射,光源离反应器顶面的距离为10厘米。用瓦里安紫外-可见光光谱仪检测,光照连续反应2小时20分钟,每隔20分钟手动进样一次进行检测,2小时20分钟后硝基苯降解完全,见图4。此外,本发明银配合物催化剂催化降解三次硝基苯后,仍然保持较好的稳定性,见图3。

Claims (3)

1.一种银杯芳烃配合物晶体,其特征在于,该配合物单晶的化学式为:[AgL0.5(NO3)],其中L=25,26,27,28-四(吡啶-3-甲氧基)杯[4]芳烃;属于单斜晶系,空间群为C2/c,β=129.073(2)°,其结构简式如下:
2.制备如权利要求1所述的银杯芳烃配合物晶体的方法,其特征在于,通过如下方法实现:将硝酸银、25,26,27,28-四(吡啶-3-甲氧基)杯[4]芳烃与甲醇加入到硬质玻璃管中并封管,随后将玻璃管放入80-90℃烘箱中反应,然后以5℃/h的速率使玻璃管缓慢降温,温度降至室温后,即得到目标产物;
硝酸银与25,26,27,28-四(吡啶-3-甲氧基)杯[4]芳烃的摩尔比是2:1;
甲醇加入量为4-5毫升。
3.如权利要求1所述的银杯芳烃配合物晶体的应用,其特征在于,紫外光照射下,将其应用于光催化降解硝基苯。
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