Preparation and Characterization of Activated Carbon from Hydrochar by Phosphoric Acid Activation and its Adsorption Performance in Prehydrolysis Liquor

Chen, Jiachuan; Zhang, Lei; Yang, Guihua; Wang, Qiang; Lucia, Lucian A.

doi:10.15376/biores.12.3.5928-5941

Cited by 51 publications

(32 citation statements)

References 27 publications

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“…In addition, with an effort to promote the adsorption capacity of hydrochars, several chemical agents have been applied to modify hydochar surface structure. Nitric acid (Güzel et al., 2017; Jin et al., 2018; Shim et al., 2001), sulfuric acid (Jiang et al., 2003), hydrogen peroxide (Huang et al., 2018; Wang et al., 2018a; Xue et al., 2012), potassium hydroxide (Sun et al., 2015), ozone (Valdés et al., 2002), and phosphoric acid (Chen et al., 2017) are the reagents frequently used to enhance oxygen content on the adsorbent surface. Although such a chemical modification process may also affect the surface area and pore size distribution of the adsorbent (Güzel et al., 2017), when a synthetic hydrochar is gone through such advanced oxidation processes at room temperature and converted to the so-called “oxidized-hydrochar,” enhancement in its adsorption performance in large part owing to the further increasing oxygenated moieties on the material surface can be expected (Xue et al., 2012).…”

Section: Introductionmentioning

confidence: 99%

Effect of nitric acid oxidation on the surface of hydrochars to sorb methylene blue: An adsorption mechanism comparison

Nguyen

Tran

Chao

et al. 2019

Adsorption Science & Technology

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The capacity and underlying mechanism of hydrochars derived from commercial D-glucose and wasted orange peels (designated as pristine-hydrochars) and further modified with nitric acid (designated as oxidized-hydrochars) to adsorb methylene blue were investigated. Both pristineand oxidized-hydrochars were characterized by scanning electron microscopy, Brunauer-Emmet-Teller-specific surface area, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and mass titration. The maximum methylene blue adsorption capacity at 30 C

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Section: Introductionmentioning

confidence: 99%

Effect of nitric acid oxidation on the surface of hydrochars to sorb methylene blue: An adsorption mechanism comparison

Nguyen

Tran

Chao

et al. 2019

Adsorption Science & Technology

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“…Notwithstanding that both chars (biochar and hydrochar) can be used for a similar purpose, they significantly differ from each other in terms of their physical and chemical properties [12] Hydrochar is quite hydrophobic, friable, and more energy dense while biochar is a pyrogenic black carbon which exhibits high porosity and attraction sites. In addition, the yield of hydrochar is about 70 to 80%, which is higher than biochar [13].…”

Section: Introductionmentioning

confidence: 88%

Preparation, characterization and cost analysis of activated biochar and hydrochar derived from agricultural waste: a comparative study

et al. 2019

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Utilization of low-cost, abundant and biomaterials is highly recommended for sustainable environment protection. This study presents a comparative analysis on the preparation, characterization and cost analysis of the novel activated biochar (BTS) and activated hydrochar (HTS). Teff (Eragrostis tef) straw was used as a precursor for producing BTS and HTS through pyrolysis and hydrothermal carbonization process, respectively. Both chars were further activated using 30 wt% H 3 PO 4 for 3 h activation time. The physicochemical properties of both chars were compared by different characterization techniques including BET, FTIR, XRD, SEM, and TGA. Briefly, BTS exhibited heterogeneous surface structures and comparatively larger specific surface area (627.7 m 2 /g) than that of HTS (43.8 m 2 /g) with the smooth coalesced carbon layer and dull surface edges. The XRD analysis revealed the amorphous character of HTS which is dominantly composed of AlPO 4 , whilst indicating BTS to be the crystalline structure with the very trivial amount of impurities. The oxygen-containing functional groups increased for HTS in comparison to BTS. Thermogravimetric analysis showed that HTS exhibited better thermal behaviors. Estimated costs incurred in the production of the HTS were found to be cheaper than compared to BTS. Overall, the experiment result suggested that Teff straw could have the potential for producing a low cost activated chars.

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“…Also, it includes wide range of amorphous carbonaceous materials that exhibit a high degree of porosity and extended inter particulate surface area [15]. The commonly used feedstocks for traditional activated carbon production are wood, coal, petroleum residues, peat, lignite and polymers, which are very expensive and non-renewable [16]. Therefore, the bio-based activated carbon is the expected renewable material.…”

Section: Figure 1 Hydrothermal Technology Classificationmentioning

confidence: 99%

Key Characteristics of Carbonized Corncob through Hydrothermal and Pyrolysis Conversion Techniques for Further Activation

Srilek¹,

Aggarangsi²

2019

IJEAT

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The eco-friendly technique which converted the low cost waste residues such as corncob to the valuable material such as solid fuel or advanced material is favorable. This study aims to enhance the knowledge limitation of key elements characteristics of carbonized corncob including fiber constituents, Brunauer-Emmett-Teller surface area and Fourier Transform Infrared spectroscopy as the precursor material for further activation to produce the bio-based activated carbon via the mild temperature hydrothermal technique with demonstrated scale reactor comparing to high temperature pyrolysis. The hydrothermal carbonization takes place in 10 liters reactor at 250 o C. The pyrolysis is operated at 480 o C. The Brunauer-Emmett-Teller surface area of corncob feedstock, hydrochar derived from hydrothermal and biochar derived from pyrolysis are 16.13, 11.53 and 7.66 m2 g -1 respectively. The oxygenated functional groups contents and high BET surface area of hydrochar are more predominant than biochar. Henceforth, the optimization for better degradation of fiber constituents will be the future work before the activation step

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Preparation and Characterization of Activated Carbon from Hydrochar by Phosphoric Acid Activation and its Adsorption Performance in Prehydrolysis Liquor

Cited by 51 publications

References 27 publications

Effect of nitric acid oxidation on the surface of hydrochars to sorb methylene blue: An adsorption mechanism comparison

Effect of nitric acid oxidation on the surface of hydrochars to sorb methylene blue: An adsorption mechanism comparison

Preparation, characterization and cost analysis of activated biochar and hydrochar derived from agricultural waste: a comparative study

Key Characteristics of Carbonized Corncob through Hydrothermal and Pyrolysis Conversion Techniques for Further Activation

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