纤维素纸基比色传感器的制备及可视化检测Mn^(2+)

Design of colorimetric sensors based on filter paper for visualized detection of Mn^(2+)

利用天然纤维素(如商业滤纸)作为支架,制备了一种新型的纤维素纸基比色传感器。首先通过表面溶胶-凝胶技术在纤维素滤纸表面沉积二氧化硅凝胶薄膜,后利用静电吸附作用将聚二甲基二烯丙基氯化铵(PDDA)及重金属离子络合指示剂4-(2-吡啶偶氮)间苯二酚钠盐(PAR-Na)交替组装到二氧化硅改性的纤维素滤纸上。所制得的纸基比色传感器用于Mn^(2+)的可视化比色检测,其具有较好的灵敏度。当传感器识别Mn^(2+)后,颜色由黄色变为紫红色,肉眼检测限为0.01 ppm。当加入1,10-邻菲咯啉和SCN^(-)作掩蔽剂时,传感器可选择性识别Mn^(2+)。此外,该纸基传感器还具有良好的时间稳定性。

In this work,a new colorimetric sensing material was fabricated employing natural cellulose(eg.commercial filter paper)as scaffolds.Firstly,a layer of SiO_(2)film was deposited on the surface of the cellulose filter paper by the surface sol-gel process.Then poly dimethyl diallyl ammonium chloride(PDDA)and 4-(2-Pyridylazo)resorcinol sodium salt(PAR-Na)were assembled onto the cellulose filter paper modified with SiO_(2)in turn via the effect of electrostatic adsorption.The resulted paper-based colorimetric sen-sor was used for visualized detection of Mn^(2+)exhibiting good sensitivity.After recognitionof Mn^(2+)the sensing materials turned pur-ple from yellow,and the naked-eye detection limit for Mn^(2+)was O.01 ppm.The sensor can selectively recognize Mn^(2+)through addi-tion of 1,10-phenanthroline and SCN as the masking agents.Meanwhile,the sensor also has good time stability.