A comparative investigation on absorption performances of three expanded graphite-based complex materials for toluene

Li, Shande; Tian, Shuanghong; Feng, Yunfeng; Lei, Jiajia; Wang, Piaopiao

doi:10.1016/j.jhazmat.2010.07.052

Cited by 37 publications

(17 citation statements)

References 36 publications

(47 reference statements)

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“…It was also testified that the presences of three inhibitors had very little effects on AR97 removal by the only EG adsorption (Figure 5b). PDS activated by carbon material belonged to the heterogeneous activation, and EG was a kind of hydrophobic carbon material with macro and mesopores [58,59]. The static water contact angle was measured to evaluate hydrophobic character of the surface of EG2.…”

Section: Quenching Experiments and Radical Mechanismmentioning

confidence: 99%

Preparation and Catalytic Performance of Expanded Graphite for Oxidation of Organic Pollutant

Lan

2019

Catalysts

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A classic carbon material—expanded graphite (EG), was prepared and proposed for a new application as catalysts for activating peroxydisulfate (PDS). EG samples prepared at different expansion temperatures were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and other methods. It was observed that there existed a remarkable synergistic effect in the EG/PDS combined system to degrade Acid Red 97 (AR97). Unlike other carbon material catalysts, sp2 carbon structure may be the main active site in the catalytic reaction. The EG sample treated at 600 °C demonstrated the best catalytic activity for the activation of PDS. Degradation efficiency of AR97 increased with raising PDS dosage and EG loadings. The pH of aqueous solution played an important role in degradation and adsorption, and near-neutrality was the optimal pH in this research. It was assumed that the radical pathway played a dominant role in AR97 degradation and that oxidation of AR97 occurred in the pores and interface layer on the external surface of EG by SO4·− and ·OH, generated on or near the surface of EG. The radical oxidation mechanism was further confirmed by electron paramagnetic resonance spectroscopy. The EG sample could be regenerated by annealing, and the catalytic ability was almost fully recovered.

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Section: Quenching Experiments and Radical Mechanismmentioning

confidence: 99%

Preparation and Catalytic Performance of Expanded Graphite for Oxidation of Organic Pollutant

Lan

2019

Catalysts

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“…[25] Expanded graphite (EG) is a possible material with low density, non-toxicity, low cost, and high loading capacity. [34,35] EG has been widely used for the removal of organic pollutants such as oil, [36] organic dyes, [37] carbamazepine, [38] toluene, [39] methylene blue, [40] polyethylene glycol, [22], and methyl orange. [41] Also, EG is easy to be obtained with the chemical method or electrical chemical method by oxidation and the intercalation reaction.…”

Section: Introductionmentioning

confidence: 99%

Expanded graphite loaded with lanthanum oxide used as a novel adsorbent for phosphate removal from water: performance and mechanism study

Zhang

Gao

et al. 2014

Environmental Technology

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A novel adsorbent of expanded graphite (EG) loaded with lanthanum oxide (EG-LaO) was prepared for phosphate removal from water and characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. The effects of impregnation time, La3+ concentration, activation time, and activation temperature on the phosphate removal performance of the adsorbent were studied for optimization of preparation conditions. Isothermal adsorption studies suggested that the Langmuir model fits the experimental data well. Adsorption kinetics investigation showed that the pseudo-second-order model fits the experimental data quite well, indicating that the adsorption process is mainly a process of chemical adsorption, and chloride ions compete to react with the active sites of the adsorbent but do not prevent phosphate from adsorbing onto EG-LaO. The adsorption mechanism studies were performed by a pH dependence study of the adsorption amount. The results demonstrated that the probable mechanisms of phosphate adsorption on EG-LaO were electrostatic and Lewis acid-base interactions in addition to ion exchange.

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“…Our kinetically-driven phenomenon is to be clearly distinguished from electrosorption approaches, where decreased absorption of uncharged PHE to the surface of a carbonaceous electrode was described This phenomenon is to be distinguished from electrosorption approaches, where increased and decreased absorption of charged and uncharged chemicals to the surface of electrodes respectively was described [26]. EG is a carbonaceous material of exceptional sorption capacity [27]. It has a low apparent density in the range of 3 -10 kg m -3 [28], a high specific surface area typically ranging from 100 -200 m 2 g -1 [7] and a wide pore size distribution ranging from 2 nm -10 µm [29].…”

Section: Field Effects On Phe Interactions With Egmentioning

confidence: 99%

The power of power: Electrokinetic control of PAH interactions with exfoliated graphite

Qin

Moustafa

Harms

et al. 2015

Journal of Hazardous Materials

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A comparative investigation on absorption performances of three expanded graphite-based complex materials for toluene

Cited by 37 publications

References 36 publications

Preparation and Catalytic Performance of Expanded Graphite for Oxidation of Organic Pollutant

Preparation and Catalytic Performance of Expanded Graphite for Oxidation of Organic Pollutant

Expanded graphite loaded with lanthanum oxide used as a novel adsorbent for phosphate removal from water: performance and mechanism study

The power of power: Electrokinetic control of PAH interactions with exfoliated graphite

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