Abstract
A series of porous-carbon adsorbents termed as HDPC (hydrochar-derived pyrolysis char) were prepared from corncob and used for the 1-butanol recovery from aqueous solution. The influences of pyrolysis temperature on properties of the adsorbents were systematically investigated. The results showed that hydrophobicity, surface area, and pore volume of HDPC samples increased with an increase in pyrolysis temperature. Furthermore, the adsorption mechanism of 1-butanol on the adsorbents was explored based on correlation of the samples properties with adsorption parameters extracted from the 1-butanol adsorption isotherms (KF and Qe12). Overall, the 1-butanol adsorption capacity increased with a decrease in polarity and an increase in aromaticity, surface area and pore volume of HDPC samples. However, at different pyrolysis temperature, the factors causing the increase of 1-butanol adsorption on the adsorbents are variable. The kinetic experiments revealed that the pores played a vital role in the 1-butonal adsorption process. The intraparticle diffusion model was used to predict the adsorption kinetic process. The simulation results showed that intraparticle diffusion was the main rate-controlling step in the 1-butanol adsorption process.
Highlights
Hydrochar is a charred material which is obtained by hydrothermal carbonization (HTC) of biomass at relatively low temperature (160–300 °C) in the presence of water under self-generated pressure[1,2]
The primary objective of this study is to investigate the main factors that affect 1-butanol adsorption and to explore the adsorption mechanism of 1-butanol on the hydrochar-derived pyrolysis char (HDPC) materials
The 1-butanol adsorption capacity is enhanced by high aromacity, hydrophobicity and porosity and low surface O-containing functional groups of samples
Summary
Hydrochar is a charred material which is obtained by hydrothermal carbonization (HTC) of biomass at relatively low temperature (160–300 °C) in the presence of water under self-generated pressure[1,2]. Yu et al have investigated how pyrolysis temperature effected on the properties of HTC materials, and the post-carbonized samples were used to selectively adsorb CO2 and N221. Zhu et al have researched the effects of activation temperature on characterization of HDPC samples and on the performance of HDPC samples in adsorbing tetracycline from aqueous solutions They demonstrated that the characteristics of HDPC samples generated at different carbonization temperatures determined the behavior or capacity of tetracycline adsorption[22]. A numbers of materials have been used for 1-butanol adsorption, including activated carbon, zeolites, ZIF-8, and polymers[30,31,32] Those studies revealed that hydrophobic adsorbents potentially show the desired high selectivity for 1-butanol over water. The primary objective of this study is to investigate the main factors that affect 1-butanol adsorption and to explore the adsorption mechanism of 1-butanol on the HDPC materials
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