posted on 2021-10-08, 21:33authored byYu Wang, Jia Chen, Ming Guan, Hongdeng Qiu
An
iron–nickel bimetallic oxide porous graphene composite
material (Fe/Ni-PG) was prepared by a simple partial combustion method,
which can be used to effectively remove sulfonamides (SAs) from an
aqueous solution. The adsorption performance of Fe/Ni-PG, Fe-PG, and
Ni-PG on six kinds of SAs was compared, and the influence of time,
temperature, pH, and initial concentration of SAs on the adsorption
behavior of SAs of Fe/Ni-PG in an aqueous solution was studied. The
adsorption kinetics and thermodynamics exhibited that the Langmuir
model and pseudo-second-order kinetics model can describe the adsorption
isotherm and kinetics. The maximum adsorption capacities of sulfadiazine
(SD), sulfamerazine (SM), sulfamethazine (SDM), sulfathiazole (STZ),
sulfapyridine (SPD), and sulfisoxazole (SIZ) calculated by the Langmuir
model were 26.3, 50.3, 42.2, 27.3, 34.5, and 41.7 mg/g, respectively,
which exceeded those of most reported adsorbents. In the adsorption
process, hydrogen bonding, π–π electron donor–acceptor,
electrostatic interaction, and bimetallic synergies play a major role,
and the entire adsorption process is spontaneously endothermic. In
addition, the material has excellent stability, and the Fe/Ni-PG after
desorption is consistent with the raw material. This work provides
a favorable way for the removal of SAs in the environment.