Comparison of characterization and adsorption of biochars produced from hydrothermal carbonization and pyrolysis

Jian, Xiumei; Zhuang, Xinshu; Li, Bosong; Xu, Xinhua; Wei, Zebin; Song, Yanpei; Jiang, Enchen

doi:10.1016/j.eti.2018.01.004

Cited by 137 publications

(62 citation statements)

References 43 publications

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“…Previous works have proven that hydrochars can be more effective adsorbents than thermal (pyrolytic) biochars due to their diverse structures and surface functional groups [54]. Looking at the characteristics of the hydrochars, the GS-220-40 was selected for further activation to achieve a well-developed porosity typical of a carbon-based adsorbent.…”

Section: Activated Carbons By Chemical Activation Of Hydrocharsmentioning

confidence: 99%

Low-Cost Activated Grape Seed-Derived Hydrochar through Hydrothermal Carbonization and Chemical Activation for Sulfamethoxazole Adsorption

et al. 2019

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Activated carbons were prepared by chemical activation with KOH, FeCl3 and H3PO4 of the chars obtained via hydrothermal carbonization of grape seeds. The hydrochars prepared at temperatures higher than 200 °C yielded quite similar proximate and ultimate analyses. However, heating value (24.5–31.4 MJ·kg−1) and energy density (1.04–1.33) significantly increased with carbonization temperatures between 180 and 300 °C. All the hydrochars showed negligible BET surface areas, while values between 100 and 845 m2·g−1 were measured by CO2 adsorption at 273 K. Activation of the hydrochars with KOH (activating agent to hydrochar ratio of 3:1 and 750 °C) led to highly porous carbons with around 2200 m2·g−1 BET surface area. Significantly lower values were obtained with FeCl3 (321–417 m2·g−1) and H3PO4 (590–654 m2·g−1), showing these last activated carbons important contributors to mesopores. The resulting materials were tested in the adsorption of sulfamethoxazole from aqueous solution. The adsorption capacity was determined by the porous texture rather than by the surface composition, and analyzed by FTIR and TPD. The adsorption equilibrium data (20 °C) fitted the Langmuir equation well. The KOH-activated carbons yielded fairly high saturation capacity reaching up to 650 mg·g−1.

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Section: Activated Carbons By Chemical Activation Of Hydrocharsmentioning

confidence: 99%

Low-Cost Activated Grape Seed-Derived Hydrochar through Hydrothermal Carbonization and Chemical Activation for Sulfamethoxazole Adsorption

et al. 2019

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“…A complete characterization of different BC has been carried out by Yang et al (2018), including proximate and ultimate analyses, pH, EC, N 2 adsorption and desorption isotherms, SEM, FT-IR, Raman and X-ray photoelectron (XPS) spectroscopies. Jian et al (2018) used rice husk as feedstock and systematically determined the effects of hydrothermal carbonization and pyrolysis on the properties of the resulting char by determining moisture content, volatile matter, ash, fixed carbon, CHNS, pH as well as performing FT-IR, SEM and BET analyses. HC produced by the hydrothermal carbonization of rice husk has been investigated with a similar analytical approach by Kalderis et al (2014).…”

Section: Introductionmentioning

confidence: 99%

Multianalytical characterization of biochar and hydrochar produced from waste biomasses for environmental and agricultural applications

et al. 2019

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“…Biochar is a low-density charred carbon material produced from the thermochemical conversion of biomass, 6 , 7 which has been applied to wastewater metal adsorption due to its considerable surface area, high porosity, surface functional groups, cation exchange capacity, and pH buffering ability. 8 Although, most of biochar has a net negative surface charge 9 and provides only a limited capacity to adsorb dichromate anions (HCrO 4 – , CrO 4 2– , and Cr 2 O 7 2 ). 10 Additionally, the powdered biochars are not easy to separate from wastewater, which limits the large-scale application of biochars in wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Influence of Synthesis Methods on the High-Efficiency Removal of Cr(VI) from Aqueous Solution by Fe-Modified Magnetic Biochars

Jian

Feng

et al. 2020

ACS Omega

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Fe-modified biochars have been widely used in removal of Cr(VI) from water due to the resulting modified surface functional groups and magnetization property. However, few studies have synthetically investigated modification methods and synthesis parameters on the improvement of the removal efficiency of Cr(VI) by Fe-modified biochars. Herein, 10 types of corn straw-based magnetic biochars were produced using pre-modification and post-modification methods with various modifier ratios, and the highest heating temperature (HHT). Cr(VI) removal results suggest that the removal efficiency of pre-modified biochars ranged from 50.7 to 98.6%, which was much higher than that of post-modified (6.6–21.6%) and unmodified biochars (0.4–7.6%). The effect of synthesis methods on Cr(VI) adsorption was in the following order: Fe-modification method > modifier ratio > HHT. The adsorption kinetics and isotherm results of three types of pre-modified biochars were well fitted with the pseudo-second-order model (R 2 > 0.99) and the Langmuir adsorption model (R 2 > 0.99), respectively, indicating the surface homogeneity of the pre-modified biochars and unilayer chemisorptions of Cr(VI). Characterization results show that iron oxides or zerovalent iron particles were successfully deposited onto the surface of biochars and magnetism was introduced. A good Pearson correlation (r = −0.9694) between the removal efficiency and pH value in modified biochar suggests that the lower pH value may offer more positive charges and promote electrostatic attraction. Therefore, the dominant mechanism for enhanced Cr(VI) adsorption on pre-modified biochar was electrostatic attraction, resulting from its distinguished acidity nature. Our findings provide new insights into the high-efficiency removal of Cr(VI) onto Fe-modified magnetic biochars and will benefit future design of more efficient magnetic biochars.

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Comparison of characterization and adsorption of biochars produced from hydrothermal carbonization and pyrolysis

Cited by 137 publications

References 43 publications

Low-Cost Activated Grape Seed-Derived Hydrochar through Hydrothermal Carbonization and Chemical Activation for Sulfamethoxazole Adsorption

Low-Cost Activated Grape Seed-Derived Hydrochar through Hydrothermal Carbonization and Chemical Activation for Sulfamethoxazole Adsorption

Multianalytical characterization of biochar and hydrochar produced from waste biomasses for environmental and agricultural applications

Influence of Synthesis Methods on the High-Efficiency Removal of Cr(VI) from Aqueous Solution by Fe-Modified Magnetic Biochars

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