Engineered biochar via microwave CO2 and steam pyrolysis to treat carcinogenic Congo red dye

Yek, Peter Nai Yuh; Peng, Wanxi; Wong, Chee Chung; Liew, Rock Keey; Ho, Yee Ling; Mahari, Wan Adibah Wan; Azwar, Elfina; Yuan, Tong Qi; Tabatabaei, Meisam; Aghbashlo, Mortaza; Sonne, Christian; Lam, Su Shiung

doi:10.1016/j.jhazmat.2020.122636

Cited by 166 publications

(27 citation statements)

References 66 publications

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“…At the same time, however, for a pH of higher than 7, alkali conditions prevailed and the presence of OHions hindered the adsorption of dye onto the biochar by competing for the active sites on the biochar. The results obtained in this study [92] were similar to that of other study [91], as both studies concluded that higher levels of pH are not ideal for the adsorption of dye using biochar due to undesirable electro-static conditions that were developed. The adsorption of organic dyes using food waste biochar was conducted and the effect of different parameters were examined [93].…”

Section: Effect Of Operational Parameters On the Adsorption Of Dyes Bsupporting

confidence: 86%

“…They observed that the efficiency of removal of the dye increased from a pH of 2 to 7 and then decreased from a pH of 7 to 11, which was due to the fact that the active sites on the surface of the biochar combined with the abundantly present hydroxyl groups, which caused a decrease in efficiency. A similar study was conducted by other researchers [92] on the adsorption of Congo red dye using biochar, made from organic peel waste, and the effect of different operational parameters on its adsorption was examined. It was observed that when the pH was kept between the range of 2-3, acidic conditions prevailed and the presence of H + ions aided the adsorption of Congo red dye onto the active sites present on the biochar.…”

Section: Effect Of Operational Parameters On the Adsorption Of Dyes Bmentioning

confidence: 92%

“…Biochar as an adsorbent works under extremely specific conditions. Concentration of dye/biochar, temperature and solution pH play important roles in determining the efficiency of biochar [90][91][92][93][94][95]. Nickel modified biochar was capable of adsorbing methylene blue with an adsorption capacity of 479.49 mg/g at 20 • C from wastewater [96].…”

Section: Effect Of Operational Parameters On the Adsorption Of Dyes Bmentioning

confidence: 99%

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Biochar as an Eco-Friendly and Economical Adsorbent for the Removal of Colorants (Dyes) from Aqueous Environment: A Review

Srivatsav¹,

Bhargav²,

Shanmugasundaram³

et al. 2020

Water

180

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Dyes (colorants) are used in many industrial applications, and effluents of several industries contain toxic dyes. Dyes exhibit toxicity to humans, aquatic organisms, and the environment. Therefore, dyes containing wastewater must be properly treated before discharging to the surrounding water bodies. Among several water treatment technologies, adsorption is the most preferred technique to sequester dyes from water bodies. Many studies have reported the removal of dyes from wastewater using biochar produced from different biomass, e.g., algae and plant biomass, forest, and domestic residues, animal waste, sewage sludge, etc. The aim of this review is to provide an overview of the application of biochar as an eco-friendly and economical adsorbent to remove toxic colorants (dyes) from the aqueous environment. This review highlights the routes of biochar production, such as hydrothermal carbonization, pyrolysis, and hydrothermal liquefaction. Biochar as an adsorbent possesses numerous advantages, such as being eco-friendly, low-cost, and easy to use; various precursors are available in abundance to be converted into biochar, it also has recyclability potential and higher adsorption capacity than other conventional adsorbents. From the literature review, it is clear that biochar is a vital candidate for removal of dyes from wastewater with adsorption capacity of above 80%.

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Section: Effect Of Operational Parameters On the Adsorption Of Dyes Bsupporting

confidence: 86%

Section: Effect Of Operational Parameters On the Adsorption Of Dyes Bmentioning

confidence: 92%

Section: Effect Of Operational Parameters On the Adsorption Of Dyes Bmentioning

confidence: 99%

See 1 more Smart Citation

Biochar as an Eco-Friendly and Economical Adsorbent for the Removal of Colorants (Dyes) from Aqueous Environment: A Review

Srivatsav¹,

Bhargav²,

Shanmugasundaram³

et al. 2020

Water

180

View full text Add to dashboard Cite

show abstract

“…Pyrolysis is also a promising thermochemical valorization technique for producing biofuels from forest waste at moderate temperatures (typically between 300 and 1,300°C) (Aghbashlo et al, 2019;Yek et al, 2020) During this process, the feedstock's chemical structure faces fundamental changes (Foong et al, 2020;Ge et al, 2021). Generally, pyrolysis is known as the method with the ability to produce a variety of solid, liquid, and gaseous products depending on pyrolysis conditions (Aghbashlo et al, 2021a).…”

Section: Conversion Of Forest Biomass Into Liquid Biofuelsmentioning

confidence: 99%

An Overview on the Conversion of Forest Biomass into Bioenergy

Qian

Wang

et al. 2021

Front. Energy Res.

Self Cite

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Biomass plays a crucial role in mitigating the concerns associated with increasing fossil fuel combustion. Among various types of biomass, forest biomass has attracted considerable attention given its abundance and variations. In this work, an overview is presented on different pathways available to convert forest biomass into bioenergy. Direct use of forest biomass could reduce carbon dioxide emissions associated with conventional energy production systems. However, there are certain drawbacks to the direct use of forest biomass, such as low energy conversion rate and soot emissions and residues. Also, lack of continuous access to biomass is a severe concern in the long-term sustainability of direct electricity generation by forest biomass. To solve this problem, co-combustion with coal, as well as pelletizing of biomass, are recommended. The co-combustion of forest biomass and coal could reduce carbon monoxide, nitrogen oxides, and sulfide emissions of the process. Forest biomass can also be converted into various liquid and gaseous biofuels through biochemical and thermochemical processes, which are reviewed and discussed herein. Despite the favorable features of forest biomass conversion processes to bioenergy, their long-term sustainability should be more extensively scrutinized by future studies using advanced sustainability assessment tools such as life cycle assessment, exergy, etc.

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“…Pyrolysis is of different types, mainly depending upon the use of raw material (biomass) and the fuel, quality and quantity of end products and the temperature during the process. More specifically, pyrolysis of biomass can be done using conventional (slow, fast, gasification, hydrothermal [22,23]), solar [24][25][26], microwave, catalytic [24,27,28], and vacuum [24,29] methods. However, in recent years, the microwave-assisted pyrolysis (MAP) process is being given more importance as it has considerable benefits over conventional pyrolysis, mainly due to its unique heating mechanism [30], energy efficiency, temperature and quality control [31].…”

Section: Introductionmentioning

confidence: 99%

Reviewing role of biochar in controlling soil erosion and considering future aspect of production using microwave pyrolysis process for the same

Wani

Narde

Huang

et al. 2021

Biomass Conv. Bioref.

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Microwave-assisted pyrolysis (MAP) is considered as one of the improved biochar production options given its cost efficiency, efficient heat transfer and better-quality control. Researchers have observed that biochar can be considered as an alternative erosion control material due to its high porosity, surface area, and surface functional groups. However, as per the available literature, contradictions exist regarding some erosion control mechanisms of biochar with respect to water holding capacity (WHC), bulk density, and aggregate formation. Further, there is a lack of exploration as to how biochar produced using MAP can be adopted for erosion control. The objective of this study is to critically review existing literature on the usage of biochar for erosion control in various types of soils. In addition, the use of the MAP technique for producing biochar for erosion control is explored. Based on the review, the available experimentation research is generally of short duration with the least consideration of the long-term ageing effects of biochar. The studies on erosion control using biochar have been mostly conducted in the shallower zone (i.e., within 20 cm). The effect of different types of biochars on various soils does not seem to have been investigated systematically. It has been observed that the mechanism of washing away biochar particles and nutrients is rarely taken into account while measuring erosion. Further, the comparative analysis of biochar types produced from various feedstocks, including their physiochemical properties, is rarely explored for their applications in soil erosion. This study aims to critically analyze available literature for the erosion suppressing mechanism of biochar, limitations and the feasibility of microwave-assisted biochar production for the purpose of soil erosion control.

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Engineered biochar via microwave CO2 and steam pyrolysis to treat carcinogenic Congo red dye

Cited by 166 publications

References 66 publications

Biochar as an Eco-Friendly and Economical Adsorbent for the Removal of Colorants (Dyes) from Aqueous Environment: A Review

Biochar as an Eco-Friendly and Economical Adsorbent for the Removal of Colorants (Dyes) from Aqueous Environment: A Review

An Overview on the Conversion of Forest Biomass into Bioenergy

Reviewing role of biochar in controlling soil erosion and considering future aspect of production using microwave pyrolysis process for the same

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