依据“需求-功能-结构”研究策略，针对多类型水体微量元素现场检测要求，首次将纳米材料同时作为吸附剂、电分离富集载体、薄层色谱固定相、光(电)催化剂、比色(荧光)探针；通过“表面、界面、晶面”协同调控、无机有机有序调控、微观参数定向调控材料成份及结构，共催化剂夹层，静电自组装，制备多亲性(即亲水性、疏水性、正电性、负电性兼备)、负载型、高光(电)催化活性、可见光响应、无毒二氧化钛基纳米复合材料薄层，富集，分离，光降解有机物，去除基体干扰，光(电)催化转化微量元素形态，检测水溶性、疏水性、阴阳离子型样品。. 创新性整合吸附富集、薄层色谱分离、电分离富集、可见光光(电)催化和便携式(比色或荧光)检测等五项技术，集成为便携式(可视化)、器件化、高灵敏、廉价、具有自主知识产权的水质现场全分析系统；可提供现场微量元素形态分析或多元素同时检测新方法、多功能化纳米材料可控制备新技术。

The research strategy of requirement-function-structure is used by this project. According to the special requirements of on-field detection of trace elements in various water samples, the titanium dioxide-based nanocomposites self-assembled thin layer (TNSTL) will be used for the first time as the adsorbent, the carrier of electric enrichment and separation, the stationary phase for thin layer chromatography, the photocatalysts photoelectroxatalyst, colorimetric (or fluorescent) probe. TNSTL with the characteristics of positive and negative charge, hydrophile, hydrophobe, high activity of photocatalysis or photoelectroxatalysis, visible light response, and non-toxicity will be used for the preconcentration, separation, photodegradation of organic compounds, removal of matrix interference, species transformation of trace elements, detection of all kinds of samples. TNSTL will be prepared by the synergistic regulation of surfaces, interfaces, and crystal surface, the orderly combination of inorganic and organic matters, the targeted regulation of specific structural parameters, the insertion of co-catalyst, and layer by layer self assembly.. The technologies of thin layer chromatography, electric separation and enrichment, visible light-induced photocatalysis and photoelectrocatalysis, and portable determination(colorimetric or fluorescent detection) will be integrated for the first time as a fully integrated trace elemental analysis system with high sensitivity, low cost, and independent intellectual property rights. A new method for the on-field elemental speciation analysiss or simultaneous detection of multiple elements and a new technology for the controllable preparation of multifunctional nanocomposites can be offered by this project.