Characterization and application of chars produced from pinewood pyrolysis and hydrothermal treatment

By Zhengang Liu, Fu-Shen Zhang, Jian-Zhi Wu. 2010

512 citations recorded by the source corpus.

Two types of pinewood chars, hydrothermal char (H300) and pyrolytic char (P700) from biomass-toenergy conversion were characterized and used as adsorbent for the copper removal from aqueous solution. The result showed that the pinewood underwent a deeper carbonization during pyrolysis process and more activated sites available and stable carbon-oxygen complex existed after hydrothermal treatment. Comparing with raw pinewood, hydrothermal treatment increased 95% total oxygen-containing groups ( carboxylic, lactone and phenolic group) while 56% oxygen-containing groups decreased after pyrolysis process. SEM analysis indicated that both hydrothermal and pyrolytic processes developed rough surface with new cavities on the chars, and the BET surface area were 21 and 29 m(2)/g for H300 and P700, respectively. Although H300 had lower surface area, its adsorption capacity for copper was much higher than P700 since ion-exchange reaction was the predominant removal mechanism by H300, while physical adsorption dominated by P700. The adsorption data could be well described by Langmuir isotherm model for copper onto both H300 and P700. (C) 2009 Elsevier Ltd. All rights reserved.

Subfields: Biomedical Engineering, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/90f06bad51e993c19cc6fcd20dc77d155e5cd2d7

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Citations in the corpus

Production of high surface area mesoporous activated carbons from waste biomass using hydrogen peroxide-mediated hydrothermal treatment for adsorption applications (2015, background): “Higher Cu adsorption on the former was attributed to the presence of higher OFG content, thereby demonstrating the importance of OFGs in adsorption of cationic species [55].”
Application of biochar for the removal of pollutants from aqueous solutions. (2015, unknown): “Biochars produced by HTC even reported to have better removal efficiency than slow pyrolysis in some case (Liu et al., 2010; Elaigwu et al., 2013).”
Influence of Pyrolysis Temperature on Cadmium and Zinc Sorption Capacity of Sugar Cane Straw–Derived Biochar (2013, background): “This effect could be the result of a melting and fusion process of the lignin and other small molecule compounds, such as pectin and inorganic compounds, as described by Liu et al. (2010) for pinewood biochar produced at 300 °C and 700 °C. Melo et al. (2013).”
Hydrothermal conversion of biomass waste to activated carbon with high porosity: a review. (2016, background): “reported the formation of OFG in the pinewood derived hydrochar which is found to be almost 340% higher compared to the pyrolytic char, and when employed as an adsorbent, and also showed 62% higher uptake of copper ions [2].”
A review of biochar as a low-cost adsorbent for aqueous heavy metal removal (2016, background): “For example, biochars converted from switch grass (300 C) and pine wood (700 C) can both effectively remove aqueous uranium (U) and Cu through diffusive surface adsorption process (Kumar et al., 2011; Liu et al., 2010).”
Surface characterization of rice husk bio-char produced by liquefaction and application for cationic dye (Malachite green) adsorption (2015, background): “Recently, liquefaction, a low temperature (250–350 C) and high pressure (5–20 MPa) process with solvent participation (including hydrothermal liquefaction which use water as the solvent), which was commonly used for bio-oil (main product) production, has been taken into account for potential effecti”