Adsorption of estrone with few-layered boron nitride nanosheets: Kinetics, thermodynamics and mechanism

Chemosphere
Guohong LiuYujie Feng

Abstract

Boron nitride Nanosheets (BNNSs) was fabricated with a method of heating the mixture of boric acid and urea in N2 atmosphere and used to remove estrone (E1) from water. The obtained BNNSs exhibited a higher surface area of 896 m2/g, a large pore volume of 0.76 cm3/g, and only few layers (0.398 nm) with the boric acid and urea ratio of 1:80. The layer number of BNNSs decreased from 15 to 4 with the mole ratio of boric acid and urea decreasing from 1:20 to 1:80, which was identified by SEM, TEM, AFM and BET measurements. More importantly, BNNSs presented an outstanding adsorption performance for estrone with the adsorption capacity of 249.15 mg E1/g BNNSs. The adsorption process could be best fitted by pseudo second-order kinetic model and the equilibrium data at different temperatures were well fitted by Langmuir isotherm model. The thermodynamics analysis revealed that E1 adsorption on BNNSs was spontaneous (ΔG = -29.33 kJ mol-1), enthalpy-retarded (ΔH = 29.75 kJ mol-1), entropy-driven (ΔS = 198.26 J mol-1 K-1), and mostly chemical adsorption. The adsorption rates of E1 in water were sharply enhanced with thinner BNNSs as absorbents and removal efficiency by BN-60 regenerated after 6 times was above 95%, it was shown that the s...Continue Reading

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Citations

Sep 19, 2018·Nanoscale·Dmitry V ShtanskyDmitri V Golberg
Sep 11, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Archie NgLokesh P Padhye

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