The removal of methyl orange from aqueous solution by biochar and activated carbon under microwave irradiation and in the presence of hydrogen peroxide

Veksha, Andrei; Pandya, Puja; Hill, Josephine M.

doi:10.1016/j.jece.2015.05.003

Cited by 27 publications

(10 citation statements)

References 33 publications

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“…In contrast, non-activated Char-800-HT did not remove organic compounds from SAGD water, suggesting that activation was a necessary step for the development of the pores responsible for adsorption. These results are consistent with a previous study [ 25 ], in which non-activated char was found to be ineffective for the removal of methyl orange from aqueous solutions. Regardless of the activation process, the maximum TOC removal by the prepared activated carbon samples was ~70%, which was similar to the removal by the commercial steam activated carbon from wood ( i.e.…”

Section: Resultssupporting

confidence: 93%

Activation of Aspen Wood with Carbon Dioxide and Phosphoric Acid for Removal of Total Organic Carbon from Oil Sands Produced Water: Increasing the Yield with Bio-Oil Recycling

2016

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Several samples of activated carbon were prepared by physical (CO2) and chemical (H3PO4) activation of aspen wood and tested for the adsorption of organic compounds from water generated during the recovery of bitumen using steam assisted gravity drainage. Total organic carbon removal by the carbon samples increased proportionally with total pore volume as determined from N2 adsorption isotherms at −196 °C. The activated carbon produced by CO2 activation had similar removal levels for total organic carbon from the water (up to 70%) to those samples activated with H3PO4, but lower yields, due to losses during pyrolysis and activation. A method to increase the yield when using CO2 activation was proposed and consisted of recycling bio-oil produced from previous runs to the aspen wood feed, followed by either KOH addition (0.48%) or air pretreatment (220 °C for 3 h) before pyrolysis and activation. By recycling the bio-oil, the yield of CO2 activated carbon (after air pretreatment of the mixture) was increased by a factor of 1.3. Due to the higher carbon yield, the corresponding total organic carbon removal, per mass of wood feed, increased by a factor of 1.2 thus improving the overall process efficiency.

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Section: Resultssupporting

confidence: 93%

Activation of Aspen Wood with Carbon Dioxide and Phosphoric Acid for Removal of Total Organic Carbon from Oil Sands Produced Water: Increasing the Yield with Bio-Oil Recycling

2016

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“…In this case, the activation parameters were more controllable due to the small amounts of stationary precursor. Other authors have prepared activated biochars using a laboratory-scale furnace for both steps: pyro-gasification and activation [43][44][45][46][47][48][49][50]. Although a pilot-scale activation furnace that would be readily applicable for industrial-scale production of activated biochar shows great promise, few studies have investigated the processing conditions for these technologies to date.…”

Section: Introductionmentioning

confidence: 99%

The influence of pilot-scale pyro-gasification and activation conditions on porosity development in activated biochars

Braghiroli

Bouafif

Hamza

et al. 2018

Biomass and Bioenergy

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Few studies have examined the influence of pyro-gasification and activation conditions on porosity development in activated biochars. In this context, this study investigates the effects of pyrogasification temperature (315, 399, and 454 °C), activation temperature (700, 800, and 900 °C), and activating agent (CO2 flow rate: 2, 3, and 5 L min -1 ) on porosity in materials made from wood residues (black spruce and white birch). Activated biochars were prepared in a two-step process: torrefaction/fast pyrolysis in a pilot-scale plant and activation using an in-house pilot-scale furnace.Results show that the physical properties of activated biochars improved over biochars and wood residues, with fivefold greater surface area for activated birch biochar over biochars, and threefold greater surface area for activated spruce biochars. Statistical analysis results reveal that pyrogasification and activation temperature, CO2 gas flow rate, and wood residue type significantly affected the porosity of activated biochars (at p < 0.05). The main findings are as follows: i) Torrefaction or pyrolysis pre-treatment step had less impact on the porosity of activated biochars, so lower energy expenditure is required to improve product quality, i.e., porosity; ii) Activation temperature was the major variable to optimize specific surface area; by increasing from 700 to 900 °C, the average surface area for activated biochars made from both wood residues increased to nearly 120 m 2 g -1 ; iii) pilot-scale technologies produced porous activated biochars comparable to laboratory-scale technologies which could boost incentives to use thermochemical biomass conversion, and increase the profitability with these diversified by-products in biorefinery industry.

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“…However, H 2 O 2 activation has been achieved primarily with O 3 , UV or the Fe(II)/Fe(III) redox couple (Sun, 2018), which adds to the total cost (CAPEX and OPEX) and system complexity. In fact, multiple carbon materials including activated carbon (Veksha, 2015), carbon nanotubes and biochar (Fang, 2014;Huang, 2016) (Fang, 2014). As for the H 2 O 2 activation by PCMs, it is inferred that the H 2 O 2 activation was related mainly to structural defects, as they are shown to raise the local electron J o u r n a l P r e -p r o o f density (Qiu, 2020).…”

Section: Electrochemical Generation Of H 2 O 2 and •Ohmentioning

confidence: 99%

Porous carbon monoliths for electrochemical removal of aqueous herbicides by “one-stop” catalysis of oxygen reduction and H2O2 activation

Dong

et al. 2021

Journal of Hazardous Materials

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The removal of methyl orange from aqueous solution by biochar and activated carbon under microwave irradiation and in the presence of hydrogen peroxide

Cited by 27 publications

References 33 publications

Activation of Aspen Wood with Carbon Dioxide and Phosphoric Acid for Removal of Total Organic Carbon from Oil Sands Produced Water: Increasing the Yield with Bio-Oil Recycling

Activation of Aspen Wood with Carbon Dioxide and Phosphoric Acid for Removal of Total Organic Carbon from Oil Sands Produced Water: Increasing the Yield with Bio-Oil Recycling

The influence of pilot-scale pyro-gasification and activation conditions on porosity development in activated biochars

Porous carbon monoliths for electrochemical removal of aqueous herbicides by “one-stop” catalysis of oxygen reduction and H2O2 activation

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