The study envisages a novel, two-in-one, pH-based, discriminative solid-state dual colorimetric sensor for the selective and sequential sensing and recovery of industrially/environmentally relevant Co²⁺ and Fe³⁺ ions. The proposed solid-state optical sensor embraces a direct and uniform dispersion of 4′-phenyl-2,2′,6′,2″-terpyridine (PTPy) - a heterocyclic chromoionophore, onto the hexagonal array of honeycomb structured mesoporous silica monolith. The surface morphology, microstructural pattern, phase transition properties, elemental composition and pore features of the sensor material are examined using FE-SEM-EDAX, HR-TEM-SAED, p-XRD, XPS, FT-IR, TGA and BET/BJH analysis. The silica monolith reveals a high surface area and voluminous porosity that ensures a homogeneous dispersion of the chromoionophoric molecules, thus enabling ultra-fast sensing kinetics through easy ion diffusion to the chelating sites. The solid-state colorimetric sensor exhibits a linear response range in the concentration range of 0–100 μg/L, with 0.5 and 0.3 μg/L as detection limits for Co²⁺ and Fe³⁺, respectively. The proposed optical sensor is loaded with intelligent pH-based selective ion-sensing, easy operation, excellent aqueous compatibility, high chemical/thermal stability, brilliant ion-selectivity and sensitivity. The solid-state sensor exhibits good reusability for several cycles. It can serve as an efficient, low-cost sensor kit for continuous real-time environmental monitoring and an ion-concentrator for industrial applications' resource recovery.

该研究设想了一种新型、二合一、基于 pH 值的判别固态双比色传感器，用于选择性和顺序传感和回收工业/环境相关的 Co ²⁺和 Fe ³⁺离子。所提出的固态光学传感器包含 4'-苯基-2,2',6',2”-三联吡啶 (PTPy) - 一种杂环色离子载体，直接且均匀地分散在蜂窝结构的介孔二氧化硅整体的六边形阵列上。使用 FE-SEM-EDAX、HR-TEM-SAED、p-XRD、XPS、FT-IR、TGA 和 BET/BJH 检查传感器材料的表面形态、微观结构图案、相变特性、元素组成和孔特征分析。二氧化硅整体显示出高表面积和大孔隙率，确保发色离子载体分子的均匀分散，从而通过易于离子扩散到螯合位点实现超快速传感动力学。固态比色传感器在 0-100 μg/L 的浓度范围内表现出线性响应范围，分别为 0.5 和 0。²⁺和Fe ³⁺，分别。所提出的光学传感器装载了智能的基于 pH 的选择性离子传感，易于操作，优异的水相容性，高化学/热稳定性，出色的离子选择性和灵敏度。固态传感器在几个循环中表现出良好的可重复使用性。它可以用作高效、低成本的传感器套件，用于连续实时环境监测，也可以用作工业应用资源回收的离子浓缩器。