Impact of biochar produced from post-harvest residue on the adsorption behavior of diesel oil on loess soil

Abstract

The primary objective of this study was to investigate the effect of biochar, produced from wheat residue at different temperatures, on the adsorption of diesel oil by loess soil. Kinetic and equilibrium data were processed to understand the adsorption mechanism of diesel by biochar-affected loess soil; dynamic and thermodynamic adsorption experiments were conducted to characterize this adsorption. The surface features and chemical structure of biochar, modified at varying pyrolytic temperatures, were investigated using surface scanning electron microscopy and Fourier transform infrared analysis. The kinetic data showed that the adsorption of diesel oil onto loess soil could be described by a pseudo-second-order kinetic model, with the rate-controlling step being intraparticle diffusion. However, in the presence of biochar, boundary layer control and intraparticle diffusion were both involved in the adsorption. Besides, the adsorption equilibrium data were well described by the Freundlich isothermal model. The saturated adsorption capacity weakened as temperature increased, suggesting a spontaneous exothermic process. Thermodynamic parameter analysis showed that adsorption was mainly a physical process and was enhanced by chemical adsorption. The adsorption capacity of loess soil for diesel oil was weakened with increasing pH. The biochar produced by pyrolytic wheat residue increased the adsorption behavior of petroleum pollutants in loess soil.

Exploring the Adsorption of Pb on Microalgae-Derived Biochar: A Versatile Material for Environmental Remediation and Electroanalytical Applications

“…process of NBC is cationic-π interaction, similarly to other reports in literature showing pseudo-second order kinetics and Langmuir isotherm [47,48]. NBC sample showed also few changes in the IR bands after adsorption: the aromatic C=C peak at 1590 cm −1 reduced in height, while the peaks at 1310 cm −1 (C-O stretching of aromatic esters [49]) and at 1225 cm −1 (phenolic -OH stretching [50]) changed their shapes, further confirming the contribution of aromatic functional groups in the adsorption process [40,51]. MBC, instead, is more prone to adsorb Pb through complexation and co-precipitation processes.…”

Development of a new hydrophobic magnetic biochar for removing oil spills on the water surface

“…With the sorption of the surface hydrophobic layer, the intact pore structure associated with the presence of macropores can hold more oil. Moreover, hydrogen bonds are formed between polar components of the oil (especially resins and asphaltenes) and the biochar's oxygen-containing functional groups, including -COOH and -OH (Jiang et al 2016). The graphene content of biochar is electron rich and interacts with electron-deficient components of the oil, enhancing the π-π electron effect (Ahmad et al 2014).…”

High performance adsorption of diesel fuel by enhanced hydrophobicity biochar-based adsorbents: Equilibrium, kinetic study and experimental design

“…Type of oil Maximum capacity (mg/g) Crab-shell-derived biochar Diesel oil 93.9 [51] Maple biochar Crude oil 6200 [52] Post-harvest residue -derived biochar Diesel oil 23.7 [53] Pinewood biochar Toluene 700 [54] Biochar modi ed with lauric acid Crude oil 6400 [19] Lauric acid-modi ed palm leaves Used oil 1180 [55] B-BC/Fe…”

“…Based on the results, among similar reported adsorbents in literature, O-BC/Fe 3 O 4 and B-BC/Fe 3 O 4 adsorbents showed the greatest adsorption capacity.This can be related to the presence of carbon chains which can enhance hydrophobicity of the prepared adsorbents. Consequently, the synthesized adsorbents can appear to be promising adsorbents for removal of diesel fuel from water to reduce its dangerous effects[51][52][53][54][55].4. ConclusionsIn this study, we report a simple synthetic way to prepare economical biochar-based absorbents for adsorption of diesel fuel from water.…”