Journal
ENVIRONMENTAL RESEARCH
Volume 184, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2020.109337
Keywords
Congo red; Eriochrome black T; Adsorption; Hyper-cross-linked resin; Vant Hoff plot
Funding
- KFUPM project [DF181029]
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A novel hyper-cross-linked polyamide resin (PSI-PA) has been synthesized for the ultrahigh removal of Congo red (CR) and Eriochrom Black T (EBT) from aqueous solution. The mesoporous resin, having a specific surface area (98.80 m(2) g(-1)), showed maximum adsorption capacity (Q(max)) of 522.18 mg g(-1) for CR (pH 9.0) and 460.34 mg g(-1) for EBT (pH 6) at room temperature. The adsorption of these dyes was rapid and the equilibrium was attained within 4 h. The kinetic data was well-fitted by pseudo-second-order rate equation. Analysis of the surface chemical composition of loaded PSI-PA by XPS revealed the appearance of a new peak at around 166.0 eV (S 2p), confirming the adsorption of the sulfur-based dyes onto the resin. Examination of experimental data of dyes adsorption by a variety of non-linear adsorption isotherms and kinetic models suggested that the Langmuir model exhibited the best fit with high correlation coefficients for both CR (R-2 = 0.9966) and EBT (R-2 = 0.9934). PSI-PA has been extensively characterized by FT-IR, solid state C-13 (CP-MAS) NMR, EDS, TGA and BET analysis. Moreover, PSI-PA exhibited 82% removal efficiency for dyes in simulated effluents, mani-festing its promise and utility for treating industrial effluent.
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