Biochars derived from marine macroalgae as a mesoporous by-product of hydrothermal liquefaction process: Characterization and application in wastewater treatment

Parsa, Mehran; Nourani, Mohammad Reza; Baghdadi, Majid; Hosseinzadeh, Majid; Pejman, Mehdi

doi:10.1016/j.jwpe.2019.100942

Cited by 47 publications

(13 citation statements)

References 53 publications

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“…In contrast, U_char and UA_char show irregular aggregation consisting of numerous small cracks ( Fig. 1 (b,c)), due to the volatiles released during HTL [18] . UA_char has more lance-shaped structures, while there is less porous structure observed on the U_char surface.…”

Section: Resultsmentioning

confidence: 98%

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Waste-to-wealth application of wastewater treatment algae-derived hydrochar for Pb(II) adsorption

Tang

Cheng

et al. 2021

MethodsX

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Hydrochar, as an energy-lean solid waste, is generated from an advanced biofuel conversion technique hydrothermal liquefaction (HTL) and always leads to environmental pollution without appropriate disposal. In this study, HTL-derived hydrochar is recycled and prepared as adsorbent used for Pb(Ⅱ) removal from wastewater. As the original porous structure of hydrochar is masked by oily volatiles remained after HTL, two types of oil-removal pretreatment (Soxhlet extraction and CO 2 activation) are explored. The result shows that CO 2 activation significantly enhances the adsorption capacity of Pb(Ⅱ), and the maximum adsorption capacity is 12.88 mg g −1 , as evaluated using Langmuir adsorption model. Further, apart from oily volatiles, most inorganic compounds derived from wastewater-grown algae is enriched in hydrochar, causing a smaller surface area of hydrochar. An ash-removal alkali treatment following CO 2 activation is introduced to dramatically increase the adsorption capacity to 25.00 mg g −1 with an extremely low Pb(II) equilibrium concentration of 5.1×10 -4 mg L −1 , which is much lower than the maximum level of Pb concentration in drinking water (set by World Health Organization). This work introduces an approach to reuse HTL-hydrochar as an inexpensive adsorbent in Pb-contaminated water treatment, which not only provides another possible renewable adsorbent candidate applied in the field of lead adsorption, but also finds an alternative route to reduce solid waste effluent from HTL process.

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Section: Resultsmentioning

confidence: 98%

“…Recently, HTL-hydrochar was used as efficient adsorbent to remove organic pollutant (e.g. methylene blue dye) in the wastewater [18] . Besides organic contaminant, the adsorption performance of HTL-hydrochar on heavy metal pollutant, such as Pb(II), is worthy to investigate as well.…”

Section: Protocol Backgroundmentioning

confidence: 99%

Waste-to-wealth application of wastewater treatment algae-derived hydrochar for Pb(II) adsorption

Tang

Cheng

et al. 2021

MethodsX

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“…As shown in Fig. 6a/b, the percentage of MB removal decreases with an increase in initial MB concentration, which may be due to the saturation of adsorption sites on the hydrochar surface [75,76]. The reduction in removal efficiency is more significant for HC-Ulva than for HC-Srg: the removal efficiency of HC-Ulva was reduced from around 96% to a minimum of 72% and for HC-Srg from about 99 to 84%, which could be explained by the higher surface area of HC-Srg than HC-Ulva according to the BET results, as reported in Table 4.…”

Section: Effect Of Reaction Temperature On Adsorption Performance Of ...mentioning

confidence: 87%

Production of solid hydrochar from waste seaweed by hydrothermal carbonization: effect of process variables

Soroush

Ronsse

Verberckmoes

et al. 2022

Biomass Conv. Bioref.

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This study provides a comparison of hydrothermal carbonization (HTC) char, starting from two different species of waste seaweed, namely the green algae Ulva pertusa and the brown algae Sargassum horneri. The effect of reaction temperature (180 ~ 250 ℃), biomass residence time (1 ~ 6 h), and water mass ratio (1 ~ 10) on HTC yield (38 ~ 57%) was investigated. Surface area (5 ~ 52 m 2 g −1 ), methylene blue removal efficiency (71 ~ 99%), methylene blue adsorption capacity (11 ~ 88%), and hydrochar composition have been assessed. An increasing residence time and HTC temperature led to an increase in surface area up to a maximum of 51 m 2 g −1 , while the yield in HTC hydrochar decreased around 35% for both HC. The van Krevelen diagram was extended to compare the variation in elemental composition of the waste seaweed derived hydrochars. Results of the methylene blue adsorption experiments are best described by a Langmuir model with maximal adsorption capacity values of 112 ± 7.63 mg g −1 for the Sargassum based char, produced at 180 ℃, with water/biomass ratio of 5 and 4 h residence time.

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“…The previous list of biochar characteristics and the respective adsorption mechanisms they influence is not exhaustive, biochar is a highly complex medium. One way in which current literature mitigates the complexity of biochar is by using specific feedstock material (Mohammed et al, 2018;Parsa et al, 2019;Yazdani et al, 2019;Zhang et al, 2020). This makes the chemical and physical characteristics more homogenous throughout a batch of biochar produced at known pyrolysis conditions.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Removal of methylene blue from aqueous solutions by biochar prepared from the pyrolysis of mixed municipal discarded material

Hoslett

Ghazal

Mohamad

et al. 2020

Science of The Total Environment

130

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show abstract

Biochars derived from marine macroalgae as a mesoporous by-product of hydrothermal liquefaction process: Characterization and application in wastewater treatment

Cited by 47 publications

References 53 publications

Waste-to-wealth application of wastewater treatment algae-derived hydrochar for Pb(II) adsorption

Waste-to-wealth application of wastewater treatment algae-derived hydrochar for Pb(II) adsorption

Production of solid hydrochar from waste seaweed by hydrothermal carbonization: effect of process variables

Removal of methylene blue from aqueous solutions by biochar prepared from the pyrolysis of mixed municipal discarded material

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