Novel flower-like magnetic core-shell covalent triazine polymer as a beneficial Direct Scarlet 4BS adsorbent and comprehensive study of the kinetics and isotherm adsorption
Nayereh S. Tadayoni, Mohammad Dinari, Ali Torbatian
Abstract
Covalent triazine polymers (CTPs) with unrivaled capabilities are promising candidates for the removal of organic dyes from textile effluents. In a facile method, a CTP shell was prepared by condensation of melamine and cyanuric chloride, on magnetic core nanoparticles and followed by modification with amine functional groups to give flower-like magnetic core-shell triazine covalent organic polymer (MNP@m-CTP). The structure, features, and morphology of the as-prepared MNP@m-CTP were confirmed by FT-IR, FE-SEM, TEM, TGA , XRD , and VSM . MNP@m-CTP was employed as an adsorbent in Direct Scarlet 4BS (DS-4BS) removal. The adsorbent efficiency was appraised considering the influence of main parameters, including adsorbent amount, reaction time, and pH. About 95% of the dye was acquitted from the water within 240 min at pH of 3, and the highest adsorption capacity was 215.28 mg/g for DS-4BS. The most suitable models for depicting the adsorption process were Dünwald-Wagner (DW), fractal-like pseudo-nth order (FL-PnO), and modified Pseudo-n order (M-PnO) kinetic and Konda multi-step isotherm. In addition, the MNP@m-CTP adsorbent was magnetically separable in line with the interpretation of the adsorbent mechanism behavior in dye adsorbing.