Abstract
Water containing heavy metal such as lead (Pb(II)) should be removed for supplying the pure water before discharge to water bodies. In this study, the Pb(II) monitoring and removal were evaluated by the ligand anchoring onto the mesoporous silica based conjugate materials. The material characterization was evaluated to understand the nature of the prepared hybrid type material affinity to the Pb(II) ion. The conjugate material was exhibited highly ordered structure and able to open high functionality for Pb(II) capturing. The material was enhanced the color upon addition of different concentrations of Pb(II) for defining the sensitivity based on the complexation mechanism by charge transfer elucidations. The effective pH range was 5.20 for significant color formation and the high removal efficiency of Pb(II). The low limit detection was measured and this value of 0.27 mu g/L was remarkable for ultra-trace Pb(II) monitoring in the on-site sample. The physico-chemical behavior was assayed according to the experimental parameter of optimum pH conditions, contact time, ion selectivity, isothermal equilibrium and regeneration ability. The adsorption isotherm data were well fitted to the Langmuir model as expected from the structural homogeneity of the conjugate material, and the maximum adsorption capacity was 179.82 mg/g, which was compared to the other forms of adsorbent material. The effect of foreign ion was evaluated, and the data revealed that this conjugate material was highly selective to Pb(II) ion at pH 5.20. The Pb(II) adsorbed material was regenerated with 0.10 M HCl and then reused after washing with water in several cycles without deterioration in its case cavities. The appropriate procedure was effectively captured the P(II) with a sustainable and environmentally friendly manner for production of clean water to safe-guard the public health. (C) 2019 Elsevier Ltd. All rights reserved.