Correlations and adsorption mechanisms of aromatic compounds on biochars produced from various biomass at 700 °C

Yang, Kun; Jiang, Yanlong; Yang, Jingjing; Lin, Daohui

doi:10.1016/j.envpol.2017.10.035

Cited by 95 publications

(19 citation statements)

References 34 publications

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“…This indicated that magnetic modification affected the adsorption of bisphenol A by MBC, accelerated the adsorption rate of bisphenol A, and reduced the adsorption resistance of bisphenol A [50]. The fitting parameters of the intraparticle diffusion model of BC and MBC are k d1 < k d2 and I 1 < I 2 , indicating that the adsorption rate gradually decreases while the adsorption resistance gradually increases during the adsorption process [51]. At the same time, it can be seen from Figure 4b that the fitted curves have not passed through the origin, indicating that the diffusion in particles is not the only rate control step, and the adsorption rate is also affected by chemical forces, such as ion exchange and H-bond [52].…”

Section: Effects Of Timementioning

confidence: 99%

Adsorption Characteristics and Mechanism of Bisphenol A by Magnetic Biochar

Wang

Zhang

2020

IJERPH

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In this paper, biochar (BC) was prepared from discarded grapefruit peel and modified to prepare magnetic biochar (MBC). Physical and chemical properties of BC and MBC were characterized, and the results showed that the type of iron oxide loaded by MBC was γ-Fe2O3. Compared with BC, MBC has a larger specific surface area and pore volume, with more oxygen-containing functional groups on the surface. BC and MBC were used to adsorb and remove endocrine-disrupting chemical (EDC) bisphenol A (BPA) from simulated wastewater. The results showed that the adsorption kinetics and adsorption isotherm of BPA adsorption by BC and MBC were mainly in accordance with the pseudo-second-order kinetics model and the Langmuir model. This indicates that the adsorption of BPA on BC and MBC is mainly a chemically controlled monolayer adsorption. Adsorption thermodynamics show that BC and MBC adsorption of BPA is a spontaneous exothermic reaction, and lowering the temperature is conducive to the adsorption reaction. The effect of solution pH on the adsorption of BPA by both was significant. The optimum pH for BC and MBC to absorb BPA was 6 and 3, respectively. The concentration of Na+ in the range of 0–0.10 mol·L−1 can promote the adsorption of BPA to MBC. MBC loaded with γ-Fe2O3 not only has excellent magnetic separation ability, but can also reach about 80% of the initial adsorption capacity after four cycles of adsorption. By analyzing the adsorption mechanism, it was found that the H-bond and the π–π electron donor–acceptor interaction (EDA) were the main forces for BC and MBC to adsorb BPA.

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Section: Effects Of Timementioning

confidence: 99%

Adsorption Characteristics and Mechanism of Bisphenol A by Magnetic Biochar

Wang

Zhang

2020

IJERPH

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“…In this study, the particle size of NZVI in NZVI/BC is in the range of 40-180 nm (Figure 3b). However, BC is basically composed of micropores and mesopores with average diameter less than 10 nm 13,38,45 . The N2 adsorption-desorption isotherm and pore size distribution of BC in this study are shown in Figure S3.…”

Section: Resultsmentioning

confidence: 99%

“…The inner structure information of BC and NZVI materials was observed by C-TEM technique directly 38,39 . These samples were firstly embedded into embedding agent, i.e., spurr resin, which is a mixture of 10 g vinyl cyclohexene dioxide (ERL 4221), 8 g diglycidyl ether of polypropylene glycol (DER 736), 25 g nonenyl succinic anhydride (NSA) and 0.3 g 2-dimethylaminoethanol (DMAE), purchased from SPI-Chem Supplies.…”

Section: Characterization Of Bc and Nzvi Materialsmentioning

confidence: 99%

“…Therefore, C-TEM technique has been applied widely in characterizing of solid materials such as bulk heterojunction films 36,37 , biochar 38 , and activated carbons 39 in previous studies. In this study, therefore, C-TEM technique was firstly employed to directly identify the interior structures of NZVI/BC, especially the micro locations of NZVI in NZVI/BC particles, for exploring the underlying reduction mechanisms of NZVI/BC for contaminants reduction.…”

Section: Cross-sectional Tem (C-tem) Technique First Reported In 1974mentioning

confidence: 99%

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Re-recognizing Micro Locations of Nanoscale Zero-valent Iron in Biochar Using C-TEM technique

Yang

Zhang

et al. 2020

Preprint

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Biochar supported nanoscale zero-valent iron (NZVI/BC), prepared commonly by liquid reduction using sodium borohydride (NaBH4), exhibits better reduction performance for contaminants than bulk NZVI. The better reducing ability was attributed to attachment of nanoscale zero-valent iron (NZVI) on biochar (BC) surface or into interior pores of BC particles due to observations by scanning electron microscopy (SEM) and plan transmission electron microscopy (P-TEM) techniques in previous studies. In this study, cross-sectional TEM (C-TEM) technique was employed firstly to explore location of NZVI in NZVI/BC. It was observed that NZVI is isolated from BC particles, but not located on the surface or in the interior pores of BC particles. This observation was also supported by negligible adsorption and precipitation of Fe2+/Fe3+ and iron hydroxides on BC surface or into interior pores of BC particles respectively. Precipitation of Fe2+ and Fe3+, rather than adsorption, is responsible for the removal of Fe2+ and Fe3+ by BC. Moreover, precipitates of iron hydroxides cannot be reduced to NZVI by NaBH4. In addition to SEM or P-TEM, therefore, C-TEM is a potential technique which should be employed to characterize the interior morphology of NZVI/BC for better understanding the reduction mechanisms and performance of contaminants by NZVI/BC.

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“…Various biochars pyrolyzed at 700 °C were obtained for the removal of organic contaminants. Correlations between the adsorption behavior and the physicochemical properties of biochars were studied and analyzed, while the mechanism and driving forces responsible for adsorption were also explored [15]. Research on adsorption kinetics, isotherms, and thermodynamics, and the mechanism of adsorption of methylene blue (MB) has been conducted on biochar prepared from the co-pyrolysis of municipal sewage sludge and tea waste [16].…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of Charcoal Nanomaterial from Fishery Waste with Remarkable Adsorption Ability

et al. 2019

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In this study, modified activated fishbone charcoal (MAFC) was successfully prepared to remove emulsified oil from oily wastewater. Various characteristic techniques, including SEM, XRD, FTIR, and BET, were employed to investigate the morphology, texture, and surface properties of as-prepared samples. BET results demonstrated that the specific surface area of fishbone charcoal increased from 69.8 m2/g to 206.0 m2/g after treatment with K2CO3 as an activating agent, while the total pore volume of MAFC increased from 0.003 cm3/g to 0.3 cm3/g, accompanied by the formation of abundant pore structures. It was observed that 90.1% of emulsified oil (100 mg/L) was successfully removed by MAFC under our experimental conditions. The results of a kinetic and isotherm model analysis indicated that the adsorption experimental data were not only consistent with the Langmuir adsorption isotherm but were also well-described by the pseudo-second-order adsorption model. It is expected that this highly efficient and inexpensive MAFC can be a promising bio-adsorbent for removing organic pollutants from industrial wastewater.

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Correlations and adsorption mechanisms of aromatic compounds on biochars produced from various biomass at 700 °C

Cited by 95 publications

References 34 publications

Adsorption Characteristics and Mechanism of Bisphenol A by Magnetic Biochar

Adsorption Characteristics and Mechanism of Bisphenol A by Magnetic Biochar

Re-recognizing Micro Locations of Nanoscale Zero-valent Iron in Biochar Using C-TEM technique

Facile Preparation of Charcoal Nanomaterial from Fishery Waste with Remarkable Adsorption Ability

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