Covalent organic frameworks (COFs) are known as emerging candidates for textile wastewater treatment due to their high porosity and regular channel structure. In the current paper, a Fluorene-based COF (FLU-COF) was synthesized by a facile method directing a crystalline framework. After a full characterization of the FLU-COF with different methods, its ability in removing Sky Blue A, widely used color in the textile industry, was investigated. Optimizing the parameters effective on the adsorption process by using the Central Composition Design, led to finding the optimal dye removal condition to be as pH 5; temperature: 45 °C; absorbent dosage: 0.005 g; and contact time: 60 min. In this condition, the removal efficiency has reached over 99% with a maximum adsorption capacity of 299 mg. g⁻¹. The adsorption isotherm is consistent with the Langmuir model representing monolayer adsorption. Also, the kinetic investigations show the pseudo-second-order kinetics which means that the chemical interactions play an important role in dye removal. This is of important interest to make a laboratory method into an in-field method. Thus, a low-cost, simple, and portable method was introduced for investigation of the removal of Sky Blue A. In this regard, the ability of FLU-COF in removing dyes from aqueous solutions was examined by the mobile phone colorimetry as an alternative to the time-consuming laboratory methods. The comparison between the obtained results from mobile phone colorimetry and the traditional UV–Vis spectroscopy showed the accuracy of the method.

共价有机骨架（COF）具有高孔隙率和规则的通道结构，因此被视为纺织废水处理的新兴候选者。在当前的论文中，通过引导晶体骨架的简便方法合成了芴基COF（FLU-COF）。在用不同方法对FLU-COF进行了全面表征后，研究了其去除天蓝色A（纺织工业中广泛使用的颜色）的能力。通过使用中央组成设计优化对吸附过程有效的参数，从而找到最佳的染料去除条件为pH 5；温度：45°C; 吸收剂量：0.005克；和接触时间：60分钟。在这种条件下，去除效率已超过99％，最大吸附容量为299 mg。g ^-1。吸附等温线与代表单层吸附的Langmuir模型一致。另外，动力学研究表明伪二级动力学，这意味着化学相互作用在染料去除中起重要作用。将实验室方法转变为现场方法具有重要意义。因此，引入了一种低成本，简单且便携式的方法来研究天蓝A的去除。在这方面，通过手机比色法检查了FLU-COF从水溶液中去除染料的能力。使用费时的实验室方法。从手机比色法获得的结果与传统的UV-Vis光谱法之间的比较表明了该方法的准确性。