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BACKGROUND Magnetic chitosan was crosslinked with graphene oxide and a magnetic chitosan–graphene oxide composite was synthesized and characterized. The composite was used for the removal and extraction of aromatic amines like aniline, N,N‐dimethylaniline and N,N‐diethylaniline. RESULTS Experimental factors affecting the adsorption process such as solution pH, time of contact, amount of adsorbent, initial concentration of analyte and temperature of solution were studied. The maximum adsorption capacity was found to be 7.55 mg g−1 for aniline, 6.96 mg g−1 for N,N‐dimethylaniline and 6.86 mg g−1 for N,N‐diethylaniline using pH 7 at room temperature. Kinetic and adsorption isotherm models were applied to the data which showed the best fit of experimental data to pseudo‐second‐order kinetic model and Langmuir isotherm for all three analytes. CONCLUSIONS The adsorption process was found to be spontaneous and exothermic as revealed by thermodynamic study. The maximum recoveries for aniline, N,N‐dimethylaniline and N,N‐diethylaniline were 98.56%, 97.05% and 95.26%, respectively. Successful application of the adsorbent was found for spiked aqueous samples. © 2022 Society of Chemical Industry (SCI).

In the present work, alginate magnetic graphene oxide biocomposite was synthesized for the removal and extraction of aromatic amines (aniline, p-chloroaniline and p-nitroaniline) from water samples. The biocomposite were investigated for its physiochemical characteristics such as surface morphology, functional groups, phase determination and elemental composition. The results revealed that the functional groups of graphene oxide and alginate retained in biocomposite with magnetic properties. The biocomposite was applied to water samples for the removal and extraction of aniline, p-chloroaniline and p-nitroaniline through adsorption process. The adsorption process was studied under various experimental conditions like time, pH, concentration, dose and temperature and all the parameters were optimized. The maximum adsorption capacities at room temperature with an optimum pH = 4 for aniline = 18.39 mg/g, for CA = 17.13 mg/g and for NA = 15.24 mg/g. Kinetic and isotherms models showed that the experimental data is best fitted to pseudo second order kinetic model and the Langmuir isotherm model. Thermodynamic study suggested that the adsorption process is exothermic and spontaneous. Ethanol was found to be the best eluent for the extraction of all the three analytes suggested by the extraction study. The maximum percent recoveries from spiked water samples were calculated for aniline = 98.82%, PCA = 96.65% and PNA = 93.55% which showed that alginate magnetic graphene oxide biocomposite could be useful and ecofriendly adsorbent for the removal of organic pollutants in water treatment processes.