Understanding structure-performance correlation of biochar materials in environmental remediation and electrochemical devices

Qin, Chencheng; Wang, Hou; Yuan, Xingzhong; Xiong, Tao; Zhang, Jingjing; Zhang, Jin

doi:10.1016/j.cej.2019.122977

Cited by 130 publications

(40 citation statements)

References 205 publications

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“…Comparable bands were observed for the modified biochar (Fig. 1d); however, other functional groups were noted after the addition of eggshells, indicating the structure integrity [27]. For instance, the bands at 1636-1796 1/cm, 1411 1/cm, and 708-873 1/cm could be assigned to carboxyl C=O, carbonate, and calcium carbonate, respectively, due to the eggshell component [28].…”

Section: Biochar Characterizationmentioning

confidence: 71%

Synthesis of sludge-derived biochar modified with eggshell waste for monoethylene glycol removal from aqueous solutions

et al. 2020

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In this study, the pyrolysis of sewage sludge was employed to prepare a biochar (BC) adsorbent that was modified using eggshell wastes, obtaining eggshell-modified biochar (EMBC). The adsorbent material was used for the removal of monoethylene glycol (MEG) from aqueous solutions under various adsorption conditions. Results showed that the specific surface area of EMBC (i.e., 3.95 m 2 /g) was approximately twofold higher than that of BC, implying that the application of eggshell waste would improve the surface adsorption performance. The optimum adsorption pH value was 7, achieving MEG removal efficiencies of 29.9% for BC and 89.9% for EMBC using adsorbent dosage = 2 g/L, initial MEG concentration = 100 mg/L, and 25 °C within 60 min. The adsorption mechanisms were illustrated regarding XRD, FTIR, and SEM, demonstrating that surface adsorption, pore-filling, precipitation, and complexation contributed to the adsorption process. The adsorption data fitted well to the Langmuir isotherm model with the maximum monolayer adsorption capacity of 12.20 mg/g, implying a reversible physisorption mechanism. Based on a techno-economic feasibility assessment, the preparation of BC and EMBC adsorbents for the treatment of 1 m 3 of wastewater-containing ethylene glycol would require capital costs of 4.80 and 6.50 US$, respectively. The selling of adsorbents and the economic benefit of tertiary treated water showed adequate annual profitability with payback periods of 12.97 and 6.79 years for the BC and EMBC scenarios, respectively. Hence, the study succeeded in preparing efficient and low-cost adsorbents that could be used for the tertiary treatment of petrochemical industrial wastewater containing toxic environmental pollutants.

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Section: Biochar Characterizationmentioning

confidence: 71%

Synthesis of sludge-derived biochar modified with eggshell waste for monoethylene glycol removal from aqueous solutions

et al. 2020

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“…Pyrolysis involving both carbonization and physical activation was a routine adapted to ensure the conversion of biomass to activated carbon. In addition, the purpose of carbonization was to reduce the volatile content and produce char characterized by higher amount of fixed carbon, 53 while the physical activation was proposed for pore development 17 . These processes led to the release of some volatile and a subsequent reduction in the density of GSC pellets, as depicted in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

Porous activated carbon monolith with nanosheet/nanofiber structure derived from the green stem of cassava for supercapacitor application

et al. 2020

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Carbonization and activation have been exploited as an economic and efficient approach toward the production of porous activated carbon monolith derived from green stem of cassava (GSC). In addition, ZnCl 2 was used as a chemical activator agent at various concentrations, therefore serving as a key factor in the development of porous carbon. The carbonization process (N 2) was integrated with physical activation (CO 2), and then N 2 sorption, scanning electron microscopy, X-ray diffraction, energy dispersive X-ray were examined to evaluate the specific surface area, pore structure characteristic, morphology structure, crystallinity, and the surface element, respectively. Furthermore, cyclic voltammetry was used to measure the electrochemical performance, through a two-electrode system in 1M H 2 SO 4. Therefore, the synthesized porous activated carbon exhibits a micropores-mesopores combination, and the optimized sample demonstrated nanosheet and nanofiber structures. The results show a high electrochemical behavior in 1M H 2 SO 4 electrolytes, by the electrodes, with specific capacitance, energy, and power densities of 164.58 F g −1 , 22.86 Wh kg −1 , and 82.38 W kg −1 , respectively. This route confirms the opportunity of using novel GSC in the production of porous carbon monolith with nanosheet/nanofiber structure for supercapacitor applications. K E Y W O R D S activated carbon, carbon porous, green stem of cassava, monolith, supercapacitor 1 | INTRODUCTION Green, renewable, and sustainable sources of energy systems are obtainable through the conversion of wind, water, and solar energy, 1 hence proper capture and storage is required for environmental friendly and economic application. 2 Meanwhile, supercapacitors possessing high power density, high charge-discharge rate, long cycle life, have the ability to store energy in the form of electric charges, 3 by providing a performance between capacitors and batteries. Conversely, the difference between both is that capacitors store and deliver energy incredibly quickly, while batteries have an ability to store high energy densities and also high voltages. 4 However, the main challenge of supercapacitor is related to the energy density entry through the narrow gap of batteries. Several electrode materials have been developed and suggested to improve energy density, power density, and cycle life of supercapacitor, 5 and three types were identified. These were then classified into carbonaceous

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“…Therefore, it would be economically beneficial to utilize biochar particles to develop innovative carbon nanofibrous felt for high-value applications. Because of biochar’s carbon-rich feature, it is particularly promising for use in energy storage and conversion applications [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. However, most of the reported biochar particles were in powder form rather than being incorporated in the matrix, which limits its application as a binder-free electrode.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Electrospinning and Electrospraying for the Preparation of a Precursor Membrane Containing Hydrothermally Generated Biochar Particles to Produce the Value-Added Product of Carbon Nanofibrous Felt

Liang

et al. 2021

Polymers

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Biochar is a byproduct generated from the hydrothermal liquefaction of biomass, such as corn stover, in an anaerobic environment. This work aims to convert biochar into a value-added product of carbon nanofibrous felt. First, the biochar-containing precursor membrane was prepared from simultaneous electrospinning and electrospraying. After thermal stabilization in air and carbonization in argon, the obtained precursor membrane was converted into a mechanically flexible and robust carbon nanofibrous felt. Electrochemical results revealed that the biochar-derived carbon nanofibrous felt might be a good candidate as a supercapacitor electrode with a good rate capability and high kinetic performance.

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Understanding structure-performance correlation of biochar materials in environmental remediation and electrochemical devices

Cited by 130 publications

References 205 publications

Synthesis of sludge-derived biochar modified with eggshell waste for monoethylene glycol removal from aqueous solutions

Synthesis of sludge-derived biochar modified with eggshell waste for monoethylene glycol removal from aqueous solutions

Porous activated carbon monolith with nanosheet/nanofiber structure derived from the green stem of cassava for supercapacitor application

Simultaneous Electrospinning and Electrospraying for the Preparation of a Precursor Membrane Containing Hydrothermally Generated Biochar Particles to Produce the Value-Added Product of Carbon Nanofibrous Felt

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