Recent developments on algal biochar production and characterization

Yu, Kai; Lau, Beng Fye; Show, Pau Loke; Ong, Hwai Chyuan; Ling, Tau Chuan; Chen, Wei‐Hsin; Ng, Eng-Poh; Chang, Jo Shu

doi:10.1016/j.biortech.2017.08.009

Cited by 330 publications

(82 citation statements)

References 86 publications

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“…It is a typical behaviour of such biomass materials. According to the review by Yu et al (2017), the yield of biochar derived from macroalgae ranges from 8.1 to 62.4%, respectively (on a dry weight basis) [5]. Chaiwong et al (2012) also produced biochar from freshwater Cladophora glomerata and the yield at 550 • C (higher than in the present study) was equal to 31% [4].…”

Section: Yield Of Algal Biochar and Its Proximate Analysissupporting

confidence: 41%

“…This technique compares the chemical profiles of biochar produced under different conditions (e.g., temperature), and between the raw biomass and the resulting biochar [5]. It also determines functional groups on the biochar surface that can play a key role in metal biosorption [8].…”

Section: Ft-ir Spectra Of a Raw Alga And Produced Biocharsmentioning

confidence: 99%

“…The downside is that the waste generated during their processing plus the natural occurrence of invasive species pose a major environmental problem [1][2][3]. One of the solutions to manage abounding green tide algae is pyrolysis, which is a thermal decomposition of biomass under oxygen-limited conditions, typically at a temperature range within 300-700 • C, within which algal waste can be converted to a solid product such as biochar, liquid (bio-oil) and gas [1,[4][5][6]. This technique is relatively simple and inexpensive and allows considerable flexibility in both the type…”

Section: Introductionmentioning

confidence: 99%

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Biochar from A Freshwater Macroalga as A Potential Biosorbent for Wastewater Treatment

Michalak

Baśladyńska

Mokrzycki

et al. 2019

Water

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The multi-elemental composition, surface texture and morphology of biochar, produced by pyrolysis at 300, 350, 400 and 450 °C from freshwater macroalga Cladophora glomerata, as a biosorbent of toxic metals was examined with Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES), Scanning Electron Microscopy (SEM), and Fourier Transform Infrared Spectroscopy (FT-IR) techniques. It was found that the yield of pyrolysis was inversely proportional to temperature: for 300 °C it was 63%, whereas for 450 °C—47%. The proximate analysis revealed that also biochar’s moisture and volatile matter was inversely proportional to temperature. The content of ash increased with temperature. All biochars were characterized by a similar total pore area of about 20 m2 g−1. FT-IR analysis showed that all biochars peaked at 3500–3100 cm−1 which was attributed to O–H stretching of the hydroxyl groups, at 2850–2970 cm−1, stretching vibrations of C–H bonds in aliphatic CH2 and CH groups, at 1605 cm−1, stretching vibrations from C=C of aromatics, at 1420 cm−1, bending oscillations from CH2, at about 1111 cm−1, stretching vibrations of Si–O, at 618 cm−1, vibrations from Fe–O bonds, and at 475 cm−1—Si–O–Si deformation vibrations. The biosorption properties of biochar towards Cr(III) ions were examined in kinetic studies. The biosorption capacity of biochar increased with an increase of pyrolysis temperature: the highest was for biochar obtained at 450 °C—87.1 mg Cr(III) g−1 and the lowest at 300 °C—45.9 mg g−1. Cladophora biochar also demonstrated a good ability to simultaneously remove metal ions from a multi-metal system, e.g., wastewater. The removal efficiency for Cr(III) was 89.9%, for Cu(II) 97.1% and for Zn(II) 93.7%. The biochar derived from waste-freshwater macroalgae can be a potent and eco-friendly alternative adsorptive material.

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Section: Yield Of Algal Biochar and Its Proximate Analysissupporting

confidence: 41%

Section: Ft-ir Spectra Of a Raw Alga And Produced Biocharsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Biochar from A Freshwater Macroalga as A Potential Biosorbent for Wastewater Treatment

Michalak

Baśladyńska

Mokrzycki

et al. 2019

Water

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“…Cha-01 had a high potential to remove pnitrophenols in wastewater treatment [ 18 ]. Other studies on the preparation of seaweeds carbon using as electrode materials and biobriquettes have been recorded [ 19 , 20 , 21 , 22 , 23 , 24 ]. However, the utilization of macroalgae for the preparation of photocatalysis and carrier material has not been reported elsewhere.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Macroalgae Biochar Nanomaterials with Highly Efficient Adsorption and Photodegradation Ability

et al. 2018

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In this study, carbonized kelp biochar (AKB) modified by KOH impregnation and photocatalytic Bi2MoO6/AKB composite (BKBC) nanomaterials were the first time successfully synthesized for efficient removal of dyes in aqueous solution. BET, XRD, FT-IR, and SEM were employed to characterize as-prepared samples. UV-vis and other test results indicated that the removal efficiency of methylene blue (MB) was 61.39% and 94.12% for BKBC and AKB, respectively, which was up to 13 times and 20 times higher in comparison with pure Bi2MoO6 (PBM). In addition, the equilibrium adsorption capacity of MB could reach up to 324.1 mg/g for AKB. This high dyes adsorption performance could be likely attributed to its high specific surface area (507.177 m2/g) and its abundant presence of various functional groups such as –OH and =C–H on AKB. Particularly, the existing of amorphous carbon and transition metal oxides, such as Fe2O3 and Mn5O8, could be beneficial for the photodegradation of MB for AKB. Meanwhile, experimental data indicated that adsorption kinetics complied with the pseudo-second order model well, and all of the tests had satisfactory results in terms of the highly efficient adsorption and photodegradation activity of AKB nanomaterials, which suggested its great potential in wastewater treatment.

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“…Development of carbon-based catalysts from marine algae biomass could simultaneously ease the burden of ocean pollution and solve the challenges of the high cost, and limited availability of precious metals. Algae such as Laver, Sargassum, etc., has been applied as a precursor for the preparation of heteroatom-doped carbon material because of its abundant protein and strong ion exchange capacity [17,18]. Monoatomic Fe electrocatalyst was prepared by using Laver as the precursor [19], and exhibited excellent catalytic activity and high stability compared with Pt/C catalyst.…”

Section: Introductionmentioning

confidence: 99%

Marine Algae-Derived Porous Carbons as Robust Electrocatalysts for ORR

Liu

Wang

et al. 2019

Catalysts

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Large quantities of marine algae are annually produced, and have been disposed or burned as solid waste. In this work, porous carbons were prepared from three kinds of marine algae (Enteromorpha, Laminaria, and Chlorella) by a two-step activation process. The as-prepared carbon materials were doped with cobalt (Co) and applied as catalysts for oxygen reduction reaction (ORR). Our results demonstrated that Co-doped porous carbon prepared from Enteromorpha sp. (denoted by Co-PKEC) displayed excellent catalytic performance for ORR. Co-PKEC obtained a half-wave potential of 0.810 V (vs. RHE) and a maximum current density of 4.41 mA/cm2, which was comparable to the commercial 10% Pt/C catalyst (E1/2 = 0.815 V, Jd = 4.40 mA/cm2). In addition, Co-PKEC had excellent long-term stability and methanol resistance. The catalytic ability of Co-PKEC was evaluated in a one-chamber glucose fuel cell. The maximum power density of the fuel cell equipped with the Co-PKEC cathode was 33.53 W/m2 under ambient conditions, which was higher than that of the fuel cell with a 10% Pt/C cathode. This study not only demonstrated an easy-to-implement approach to prepare robust electrochemical catalyst from marine algal biomass, but also provided an innovative strategy for simultaneous waste remediation and value-added material production.

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Recent developments on algal biochar production and characterization

Cited by 330 publications

References 86 publications

Biochar from A Freshwater Macroalga as A Potential Biosorbent for Wastewater Treatment

Biochar from A Freshwater Macroalga as A Potential Biosorbent for Wastewater Treatment

Preparation and Characterization of Macroalgae Biochar Nanomaterials with Highly Efficient Adsorption and Photodegradation Ability

Marine Algae-Derived Porous Carbons as Robust Electrocatalysts for ORR

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