Abstract
The corncob hydrochar is prepared by using a stainless autoclave at 230°C for 8 h. The products are characterized by elemental analyzer, Fourier Transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscope (SEM). The effects of hydrochar dosage, pH, adsorption time and phenol concentration on the adsorption performance of hydrochar are investigated by means of single-factor experimental analysis. Based on the experiments the adsorption thermodynamic and kinetics are tentatively discussed. The results show that abundant oxygen-containing functional groups are scattered on the surface of the corncob hydrochar. The adsorption kinetics of phenol on the hydrochar corresponds well with pseudo-second-order kinetic model. Thermodynamic studies indicate that Freundlich adsorption isotherm model is much better than Langmuir model in describing the adsorption of phenol on the corncob hydrochar at 25°C - 45°C. This study provides scientific basis for the development of cheap and efficient adsorbents for the removal of phenols derived from oilfield wastewater.
Highlights
A large amount of wastewater is produced during oilfield exploitation
Compared to the raw corncob, the hydrogen, nitrogen and oxygen contents of the corncob hydrochar is reduced by 0.11%, 0.08% and 12.4%, respectively
Experiments are performed to evaluate the use of hydrochars prepared from the hydrothermal carbonization of corncob as an adsorbent for phenols in aqueous solution
Summary
A large amount of wastewater is produced during oilfield exploitation. Phenols account for a large proportion of the total organic contaminants in the oilfield wastewater. Nowadays biochar-based adsorption technology attracts much attention in the field of wastewater treatment considering its relatively low-cost treatment and the recovery of VOCs in contrast to chemical and biological methods [1] [2] [3] [4] [5]. By adsorbing organic matter and large particles from wastewater, biochar-based adsorbents can achieve preferable removal of aqueous contaminants [6] [7] [8] [9]
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