Fabrication of metal ion detection materials generally involved problems such as high cost and complicated processes of pretreatment and operation. Herein, a novel colorimetric test paper for metal ions detection was developed based on functionalized cellulose fibers. Acetoacetyl groups were introduced on cellulose fibers by a surface esterification process. The obtained cellulose acetoacetate (CAA) fibers were made into CAA paper via a paper-making process. The CAA paper possessed robust mechanical property, thermal stability selectivity and rapid response to Fe³⁺ and Cu²⁺ ions, with an obvious naked-eye color change within 5 s. The mechanism of this visual recognition for metal ions due to that the acetoacetyl groups coordination chelated with metal ion to form six-membered ring structure, further leading to the color change of the materials. It provided a facile and universal method to prepare efficient and portable cellulose-based test paper, which has great potential in metal ion detection field.

金属离子检测材料的制备普遍存在成本高、预处理和操作工艺复杂等问题。在此，基于功能化纤维素纤维开发了一种用于金属离子检测的新型比色试纸。通过表面酯化过程在纤维素纤维上引入乙酰乙酰基。将得到的乙酰乙酸纤维素（CAA）纤维通过造纸工艺制成CAA纸。CAA 纸具有强大的机械性能、热稳定性选择性和对 Fe ³⁺和 Cu ^{2+ 的}快速响应离子，在 5 s 内肉眼颜色变化明显。这种视觉识别金属离子的机制是乙酰乙酰基与金属离子配位螯合形成六元环结构，进一步导致材料的颜色变化。为制备高效、便携的纤维素基试纸提供了一种简便、通用的方法，在金属离子检测领域具有巨大潜力。