CN111122672A - 一种CuZnO/MWCNTS非酶咖啡酸传感器的制备 - Google Patents
一种CuZnO/MWCNTS非酶咖啡酸传感器的制备 Download PDFInfo
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Abstract
本发明属于电化学传感器领域,通过简便的一锅法合成CuZnO/MWCNTS,再用CuZnO/MWCNTS修饰玻碳电极作为传感器检测咖啡酸。用本发明制备的CuZnO/MWCNTS修饰电极传感器在用于咖啡酸的电化学检测时表现良好,优化后的传感器具有较低的检测限0.155μM(LOD=3Sb/S),线性范围宽,范围为1‑100μM;良好的再现性、重复性和稳定性,该传感器可用于检测咖啡和红酒中的咖啡酸。这一发现有助于开发用于监测饮食和环境安全的新型高性能传感器。
Description
技术领域
本发明属于电化学传感器领域,尤其是一种CuZnO/多壁碳纳米管(MWCNTS)复合材料的非酶传感器的制备方法。
背景技术
咖啡酸(3,4-二羟基肉桂酸)是一种植物来源的生物分子,广泛分布于饮料,农作物,蔬菜和水果中。作为植物来源的多酚,咖啡酸具有多种生物活性,如抗氧化剂,抗肿瘤,抗诱变,抗病毒,抗炎作用和染料助剂。因此,它被应用于食品、药品和保健品,它可以预防心脏病,减少炎症和人体细胞中的诱变率,并降低癌症和糖尿病的发病率。迄今为止,已经开发了几种传统方法来检测咖啡酸,然而,这些方法通常在集中式实验室中受到限制,需要耗时的样品处理并依赖于昂贵的仪器。与其他仪器相比,电化学方法具有灵敏度高,响应快,成本低的特点,本章采用电化学方法测定咖啡酸,该方法不仅可以检测实验室样品中的CA,还可以量化咖啡和红葡萄酒中咖啡酸的含量,回收率良好,表明其在食品分析中的实用性。
ZnO是一种n型半导体,由于它的宽带隙(3.37 eV)和高激子结合能(60 meV)备受广泛关注,并且ZnO纳米材料已被合成用于各种应用,如气体传感,染料敏化太阳能电池]和光催化剂。Cu纳米结构作为金属、氧化物、合金,它有着较低的成本和良好的氧化催化活性,对咖啡酸有着优异的催化活性。但与双金属催化剂相比,单金属的催化性能较差、灵敏度低。因此Cu和ZnO结合形成CuZnO可以提高它的催化性能。
碳纳米管是由六边形排列成的碳原子层的多个相同轴的管所构成,它的层与层之间的距离约0.3 nm且保持不变,因其独特的结构,优异的机械性能和化学性质,在催化、传感器等方面具有广泛的应用。碳纳米管没有活性基团,往往很难与聚合物以化学键结合,必须对碳纳米管进行表面修饰和功能化处理,酸化后的MWCNTS作为载体负载CuZnO,两者的结合产生协效作用,从而提高复合材料的电催化性能。
发明内容
基于上述原因,本发明提供了一种CuZnO/ MWCNTS复合材料的非酶传感器的制备方法,制备具体步骤如下:
(1)配制3 M H2SO4溶液,量取160 mL H2SO4于250mL三口烧瓶中,称取1g MWCMTs加入三口烧瓶中,室温下搅拌30min,转入离心管中离心20min后,分别用无水乙醇、去离水重复洗涤并离心数次直至溶液pH为中性,将产物转入蒸发皿,在80℃下烘箱中烘烤6h,得到酸化的MWCNTs;
(2)称取0.06mol的六水合硝酸锌和0.15mol的三水合硝酸铜,1gMWCNTS,并加入180mL去离子水混合均匀,标为溶液A,配置一定浓度的Na2Co3水溶液,标为溶液B,室温下,将A溶液缓慢滴加入B溶液,并将混合物搅拌2 h,放置过夜,将混合物过滤,用1 L温热去离子水洗涤,120℃干燥12h,350℃煅烧4h,得到CuZnO/MWCNTS。
进一步地,步骤(1)酸化使用的酸可以是浓HCl, H2SO4,对甲苯磺酸。
进一步地, 步骤(2)中六水合硝酸锌称取为0.05~0.1mol,三水合硝酸铜称取为0.1~0.2mol,MWCNTS称取量为0.5-1g,溶解于150~200的去离子水中。
进一步地,步骤(2)中Na2CO3:H2O=1:3,热的去离子水温度为80~100℃。
进一步地,CuZnO/MWCNT复合材料进行电化学测试时,电位范围为-0.3 V ~+0.8V,扫描速度100 mV/s,电解液为0.1 mol/L PBS+0.5mmol/L咖啡酸。
本发明的有益效果为:用本发明制备的一种CuZnO/MWCNTS非酶咖啡酸传感器具有制备简单,灵敏度高,有着良好的再现性、重复性和稳定性等优点。
附图说明
下面结合附图对本发明作进一步说明。
图1实施例1中为CuZnO/MWCNTS复合材料的XRD图。
图2为比较例中不同物质在0.1 M PBS (pH=7)含有0.5 mM咖啡酸的CV图。
具体实施方式
现在结合具体实施例对本发明作进一步说明,以下实施例旨在说明本发明而不是对本发明的进一步限定。
实施例1:
(1)配制3 M H2SO4溶液,量取160mL H2SO4于250mL三口烧瓶中,称取1g MWCMTs加入三口烧瓶中,室温下搅拌30min,转入离心管中离心20min,然后用无水乙醇重复洗涤并且用离心机进行离心,接着用蒸馏水洗涤并且用离心机离心数次直至溶液pH为中性。将产物转入蒸发皿,在80℃下烘箱中烘烤6h, 得到酸化MWCNTs。
(2)称取0.06mol的六水合硝酸锌和0.15mol的三水合硝酸铜,1g MWCNTS,并加入180mL去离子水混合均匀,标为溶液A。配置Na2Co3水溶液(Na2Co3:H2O=1:3),标为B。室温下,将A溶液缓慢滴加进B溶液,并将混合物搅拌2 h,放置过夜后,将混合物过滤,用1 L热的去离子水洗涤,120℃干燥12h,350℃煅烧4h,得到CuZnO/MWCNTS。
图1是MWCNTS、CuZnO、CuZnO/MWCNTS的XRD图谱,在曲线MWCNTS中,2θ= 25.74°处的宽衍射峰对应于(002)晶面。2θ为31.79°,35.55°, 38.70°, 56.79的弱衍射峰与CuZnO的(100),(111),(111)和(110)晶面很好地吻合。 对于曲线c,在2θ为25.74°,31.79°,35.55°,38.70°, 56.79处的一组衍射峰可以索引到(002),(100),(111),(111)和(110)的晶面。至于曲线CuZnO/MWCNTS,可以清楚地观察到与CuZnO类似的衍射峰, 这意味着成功制备了CuZnO/MWCNTS复合材料。
实施例2
将步骤(2)制备的CuZnO/MWCNTS复合材料对咖啡酸进行检测,在0.1M PBS电解液中,持续增加咖啡酸浓度(1-100 μM),扫描速度80 mV s-1,扫描参数设置在-1.6 V ~ +1.2 V,并进行I-V测试。
对比例1
将实施例2中CuZnO/MWCNTS复合材料与单个单物质CuZnO、MWCNTS相比较,CuZnO/MWCNTS修饰电极的循环伏安曲线峰电流最高,电流变化区间最大(图2),据此可以判断CuZnO/MWCNTS修饰电极可以用于咖啡酸的检测。
Claims (5)
1.一种CuZnO/MWCNTS非酶咖啡酸传感器的制备,其特征在于:
(1)配制3 M H2SO4溶液,量取160 mL H2SO4于250mL三口烧瓶中,称取1g MWCMTs加入三口烧瓶中,室温下搅拌30min,转入离心管中离心20min后,分别用无水乙醇、去离水重复洗涤并离心数次直至溶液pH为中性,将产物转入蒸发皿,在80℃下烘箱中烘烤6h,得到酸化的MWCNTs;
(2)称取0.06mol的六水合硝酸锌和0.15mol的三水合硝酸铜,1gMWCNTS,并加入180mL去离子水混合均匀,标为溶液A,配置一定浓度的Na2Co3水溶液,标为溶液B,室温下,将A溶液缓慢滴加入B溶液,并将混合物搅拌2 h,放置过夜,将混合物过滤,用1 L温热去离子水洗涤,120℃干燥12h,350℃煅烧4h,得到CuZnO/MWCNTS。
2.根据权利要求1所述的一种CuZnO/MWCNTS非酶咖啡酸传感器的制备,其特征在于步骤(1)酸化使用的酸可以是浓HCl, H2SO4,对甲苯磺酸。
3.根据权利要求1所述的一种CuZnO/MWCNTS非酶咖啡酸传感器的制备,其特征在于步骤(2)中六水合硝酸锌称取量为0.05~0.1mol,三水合硝酸铜称取量为0.1~0.2mol,MWCNTS称取量为0.5-1g,溶解于150~200的去离子水中;Na2Co3水溶液中Na2Co3:H2O=1:3。
4.根据权利要求1所述的一种CuZnO/MWCNTS非酶咖啡酸传感器的制备,其特征在于步骤(2)中Na2CO3:H2O=1:3,温热去离子水温度为80~100℃。
5.根据权利要求1所述的一种CuZnO/MWCNTS非酶咖啡酸传感器的制备,其特征在于:CuZnO/MWCNT复合材料进行电化学测试时,电位范围为-0.3V ~+0.8V,扫描速度100 mV/s,电解液为0.1M PBS+0.5M咖啡酸。
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