Roles of graphitization degree and surface functional groups of N-doped activated biochar for phenol adsorption

Gao, Weiqi; Lin, Zixiang; Chen, Haoran; Yan, Shanshan; Zhu, Haonan; Zhang, Hong; Sun, Hongqi; Zhang, Shu; Zhang, Shoujun; Wu, Yinlong

doi:10.1016/j.jaap.2022.105700

Cited by 27 publications

(13 citation statements)

References 30 publications

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“…As previously reported [31], to begin with, the poplar wood (150-250 µm) and UF were fully mixed, and the mass ratios of UF were 10%, 30%, and 50%, respectively. The N-, O-, and S-tri-doped biochars were produced through slow pyrolysis of the aforementioned mixture with a tube furnace (YGDL-1200, Shanghai Yuzhi Electromechanical Equipment Co., Ltd., Shanghai, China) at 900 • C. A high pyrolysis temperature (900 • C) was chosen because biochar prepared at high temperatures possesses a high degree of graphitization, which is beneficial for TC adsorption [32].…”

Section: Preparation Of Biochar With Hybrid Doping Of N O and Ssupporting

confidence: 65%

Preparation of N-, O-, and S-Tri-Doped Biochar through One-Pot Pyrolysis of Poplar and Urea Formaldehyde and Its Enhanced Removal of Tetracycline from Wastewater

et al. 2022

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In this study, biochar was prepared via hybrid doping of N, O, and S by applying one-pot pyrolysis of poplar wood and S-containing urea formaldehyde at 900 °C. Different doping ratios were adopted, and the contents of O, N, and S were in the ranges of 2.78–5.56%, 2.16–4.92%, and 1.42–4.98%, respectively. This hybrid doping significantly enhanced the efficiency of the removal of tetracycline (40 mg/L) from wastewater to 71.84% in comparison with that attained by using normal poplar biochar (29.45%). The adsorption kinetics and isotherms indicated that the adsorption process was favorable and was dominated by chemisorption instead of physisorption; the dominant adsorption process may be justified by the existence of abundant functional groups. The adsorption capacity was barely related to the surface area (R2 = 0.478), while it was closely related to the concentration of graphitic N (R2 = 0.985) because graphitic N enhanced the π–π interactions. The adsorption capacity was also highly related to the proportion of oxidized N and oxidized S owing to hydrogen bonding, which may have overlapped with the contribution of O-containing functional groups. This study presents a simple hybrid doping method for biochar modification and provides fundamental insights into the specific effects of O-, N- and S-containing functional groups on the performance of biochar for tetracycline removal.

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Section: Preparation Of Biochar With Hybrid Doping Of N O and Ssupporting

confidence: 65%

Preparation of N-, O-, and S-Tri-Doped Biochar through One-Pot Pyrolysis of Poplar and Urea Formaldehyde and Its Enhanced Removal of Tetracycline from Wastewater

et al. 2022

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“…BMC500 ( ID/IG = 0.819) is also smaller than BMC700 ( ID/IG = 1.686). This shows that as the carbonization temperature increases, the carbon atomic crystals have more defects and will contain more defective sites and disordered states, and the adsorption performance will also improve. , BMC500 ( ID/IG = 0.819) is smaller than BC500 ( ID/IG = 1.321). This is because the G peak comes from the stretching vibration of the sp 2 carbon atoms, which represents the aromatic ring structure.…”

Section: Resultsmentioning

confidence: 99%

Adsorption Characteristics of Ball Milling-Modified Chinese Medicine Residue Biochar Toward Quercetin

Li,

Xie,

Chen

et al. 2024

ACS Omega

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Using traditional Chinese medicine residues as raw materials, different biochars (BC) were prepared through oxygen-limited pyrolysis at 300 °C, 500 °C, and 700 °C, and BC was ball-milled to produce ball-milled biochar (BMC). Using these adsorbents to adsorb the allelopathic autotoxic substance quercetin. The physical and chemical properties of various biochars derived from traditional Chinese medicine residues were characterized using the Brunauer−Emmett−Teller-N2 surface areas (BET), scanning electron microscopy (SEM), Fourier transform IR spectroscopy (FTIR), X-ray diffraction (XRD), and Raman spectroscopy (Raman). The study investigated the effects of the initial pH value, different humic acid concentrations, and multiple adsorption− desorption experiments on the removal of quercetin from the solution. The article discusses the adsorption mechanism of quercetin in solution by biochar from a traditional Chinese medicine residue, based on the results of adsorption kinetics and adsorption isotherm fitting. The findings indicate that increasing the pyrolysis temperature reduces the oxygen-containing functional groups of BC, enhances the aromaticity, and stabilizes the carbon structure. The pore structure of BMC becomes more complex after ball milling, which increases the number of oxygen-containing functional groups on the surface. Among the samples tested, BMC700 exhibits the best adsorption performance, with an adsorption capacity of 293.3 mg•g −1 at 318 K. The adsorption process of quercetin by BMC700 follows the pseudo-second-order kinetic model and the Freundlich adsorption isotherm model. The process is primarily a form of multimolecular layer adsorption. Its mechanism involves the pore-filling effect, hydrogen-bonding interaction, electrostatic interaction, and π−π coexistence, as well as the yoke effect. Additionally, they are highly recyclable and show promise in addressing continuous cropping issues.

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“…Therefore, N defect content plays a positive part in the adsorption of TC by decreasing the absorption energy. [31][32][33] The relevant model parameters are presented in Table 2. All three adsorption isotherm models simulated the adsorption process of the four BN samples adsorbed with TC better.…”

Section: Resultsmentioning

confidence: 99%

The engineering of defect-modified boron nitride ribbons: an effective adsorbent to rapid capture for tetracycline

Chen,

Tang,

Xie

et al. 2024

RSC Adv.

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Roles of graphitization degree and surface functional groups of N-doped activated biochar for phenol adsorption

Cited by 27 publications

References 30 publications

Preparation of N-, O-, and S-Tri-Doped Biochar through One-Pot Pyrolysis of Poplar and Urea Formaldehyde and Its Enhanced Removal of Tetracycline from Wastewater

Preparation of N-, O-, and S-Tri-Doped Biochar through One-Pot Pyrolysis of Poplar and Urea Formaldehyde and Its Enhanced Removal of Tetracycline from Wastewater

Adsorption Characteristics of Ball Milling-Modified Chinese Medicine Residue Biochar Toward Quercetin

The engineering of defect-modified boron nitride ribbons: an effective adsorbent to rapid capture for tetracycline

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