The effluent release containing heavy metals as Ni2+ ions has drastic risks to both the natural environment and human health. In this research, the nano Fe3O4/chitosan-acrylamide hydrogel was prepared as a novel nano sorbent for dispersive solid-phase extraction of Ni2+ ions and applyed in for the water sample solution. The pH, amount and type of elution solvent, the extraction time and etc were optimized for the improving the efficiency of proposed method. Analytical parameters such as concentration factor, the limit of detection and relative standard deviation (%) were achieved as 33.3, 1.25 µg L− 1 and 1.8%, respectively. The capacity in equilibrium sorption was calculated 22.54 mg g− 1. Furthermore, to estimate adsorption mode, the model of Freundlich and Langmuir was fitted to empirical isotherm data. Besides, to check the basic process of the metal adsorption mechanism pseudo-first-order and pseudo-second-order and Roginsky-Zeldovich model were investigated and the resuls were fitted with the pseudo-second-order model. Finally, the nano Fe3O4/chitosan-acrylamide hydrogel exhibited high performance to removal the Ni2+ ions from water sample solution.

An effective adsorbent was synthesised from nanographene oxide for the removal of the alprazolam drug from the water sample solution. The dispersive solid‐phase extraction method was used with α‐pyridylamine grafted nanographene oxide to extract and analyse little amounts of alprazolam in biological materials. Before beginning the experimental analysis process, it is critical to use a simple and accessible sample preparation approach. In the current study, a technique for preconcentration and measurement of trace quantities of alprazolam in aqueous samples was introduced. The pH of extraction, the amount and type of elution solvent and the period of extraction were all tuned in the alprazolam analysis technique. Analytical parameters such as the concentration factor, the limit of detection of the technique and relative standard deviation (%) were achieved as 20, 8.0 µg L −1 and 2.4%, respectively.