Hydrochars from bamboo sawdust through acid assisted and two-stage hydrothermal carbonization for removal of two organics from aqueous solution

Li, Yin; Meas, Arun; Shan, Shengdao; Yang, Renqiang; Gai, Xikun; Wang, Hongpeng; Tsend, Nyamkhand

doi:10.1016/j.biortech.2018.03.108

Cited by 86 publications

(28 citation statements)

References 41 publications

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“…It should be noted that to remove contaminants in liquid media, a large surface area is not necessarily a determinant factor. Hydrochars have very low surface areas ranging between 0.5 to 30 m 2 /g but despite of this, they can remove different substances like congo red, 2-napthol, pyrene, acetaminophen and other organic micropollutants or heavy metals [ 124 , 125 , 126 , 127 , 128 ]. The most probable explanation to why hydrochars are good adsorbents for polar substances are the aryl and alkyl moieties of the amorphous carbon structures [ 126 ].…”

Section: Characterization Of Activated Carbonsmentioning

confidence: 99%

Biobased Functional Carbon Materials: Production, Characterization, and Applications—A Review

Correa

Kruse

2018

Materials

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Even though research on porous carbon materials from biomass dates back to at least hundred years, it is still an extremely relevant topic. These materials can be found in applications that range from those that are widely known, such as water treatment, to others that are newer and indispensable for the transition towards environmentally friendly technologies, such as lithium- and sodium-ion batteries. This review summarizes some of the most relevant research that has been published concerning production technologies, insights on the chemical reaction mechanisms, characterization techniques, as well as some examples of the applications and the properties that the carbon materials must fulfil to be used in those applications.

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Section: Characterization Of Activated Carbonsmentioning

confidence: 99%

Biobased Functional Carbon Materials: Production, Characterization, and Applications—A Review

Correa

Kruse

2018

Materials

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“…The adsorption isotherm plots and model fitting curves of the three organics on RHHs are displayed in Fig. 5, and the Langmuir and Freundlich parameters as well as the correlation coefficients were calculated and summarized in Additional file 1: Table S2 calculated maximum adsorption amount of 322.6 mg/g) (Li et al 2018), rice straw hydrochars (with maximum adsorption value of 174.9 mg/g) (Li et al 2019b) and sewage sludge-based activated carbon (with calculated adsorption capacity of 111.9 mg/g) (Gu et al 2013). 2-Naphthol has a high octanol-water partition coefficient of log K ow = 2.7 (Gu et al 2013), which indicates its higher hydrophobicity.…”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

Rice husk hydrochars from metal chloride-assisted hydrothermal carbonization as biosorbents of organics from aqueous solution

Yin

Hagos

Chen

et al. 2021

Bioresour. Bioprocess.

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Hydrochar a carbon-rich material resulting from hydrothermal carbonization of biomass, has received substantial attention because of its potential application in various areas such as carbon sequestration, bioenergy production and environmental amelioration. A series of hydrochars were prepared by metal chloride-assisted hydrothermal carbonization of rice husk and characterized by elemental analysis, zeta potential, X-ray diffraction, Brunauer–Emmett–Teller measurements, Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy and scanning electron microscopy. The results reveal that the prepared hydrochars have carbon contents ranging from 45.01 to 58.71%, BET specific areas between 13.23 and 45.97 m2/g, and rich O-containing functional groups on the surfaces. The metal chlorides added in the feedwater could improve the degree of carbonization and show significant effects on the physical, chemical and adsorption properties of the hydrochars. The adsorption of the selected organics on the hydrochars is a spontaneous and physisorption-dominated process. The hydrochars possess larger adsorption capacities for 2-naphthol than for berberine hydrochloride and Congo red, and the modeling maximum adsorption capacities of 2-naphthol are in the range of 170.1–2680 mg/g. The adsorption equilibrium could be accomplished in 10, 40 and 30 min for 2-naphthol, berberine hydrochloride and Congo red, respectively. These results suggest metal chloride-assisted hydrothermal carbonization a promising method for converting biomass waste into effective adsorbents for wastewater treatment.

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“…When studied for water purification purposes, it seems reasonable to compare the adsorption performance and the physicochemical features of biochar with those of activated carbon, which is by far the most widely used regulated adsorbent that is commercially available. However, the overview of the literature currently available on biochar indicates that this is not the approach followed by authors, as biochar is synthesized and tested for the removal of selected single [ 28 , 29 ] or mixed [ 30 , 31 ] compounds.…”

Section: Activated Carbon and Biochar: The Different Approach To Characterizationmentioning

confidence: 99%

Characterization Techniques as Supporting Tools for the Interpretation of Biochar Adsorption Efficiency in Water Treatment: A Critical Review

et al. 2021

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Over the past decade, biochar (BC) has received significant attention in many environmental applications, including water purification, since it is available as a low-cost by-product of the energetic valorisation of biomass. Biochar has many intrinsic characteristics, including its porous structure, which is similar to that of activated carbon (AC), which is the most widely used sorbent in water treatment. The physicochemical and performance characteristics of BCs are usually non-homogenously investigated, with several studies only evaluating limited parameters, depending on the individual perspective of the author. Within this review, we have taken an innovative approach to critically survey the methodologies that are generally used to characterize BCs and ACs to propose a comprehensive and ready-to-use database of protocols. Discussion about the parameters of chars that are usually correlated with adsorption performance in water purification is proposed, and we will also consider the physicochemical properties of pollutants (i.e., Kow). Uniquely, an adsorption efficiency index BC/AC is presented and discussed, which is accompanied by an economic perspective. According to our survey, non-homogeneous characterization approaches limit the understanding of the correlations between the pollutants to be removed and the physicochemical features of BCs. Moreover, the investigations of BC as an adsorption medium necessitate dedicated parallel studies to compare BC characteristics and performances with those of ACs.

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Hydrochars from bamboo sawdust through acid assisted and two-stage hydrothermal carbonization for removal of two organics from aqueous solution

Cited by 86 publications

References 41 publications

Biobased Functional Carbon Materials: Production, Characterization, and Applications—A Review

Biobased Functional Carbon Materials: Production, Characterization, and Applications—A Review

Rice husk hydrochars from metal chloride-assisted hydrothermal carbonization as biosorbents of organics from aqueous solution

Characterization Techniques as Supporting Tools for the Interpretation of Biochar Adsorption Efficiency in Water Treatment: A Critical Review

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