Adsorption Characteristics of Polyvinyl Alcohols in Solution on Expanded Graphite

Pang, Xiu-Yan

doi:10.1155/2012/461386

Cited by 7 publications

(7 citation statements)

References 17 publications

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“…Several works have proposed some methods for removing polyvinyl alcohol, including biodegradation , electrocoagulation , the Fenton process , photo‐Fenton oxidation , chemical oxidation , and adsorption . This latter adsorption technique has attracted the attention of several researchers because it is a versatile treatment technique practiced widely in fine chemical and process industries for wastewater and waste gas treatment.…”

Section: Introductionmentioning

confidence: 99%

Activated carbons prepared from Thymelaea hirsuta wood: Sustainable adsorbents for polyvinyl alcohol

Omri

Benzina

2015

Env Prog and Sustain Energy

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In this study, activated carbon as novel adsorbent was prepared from low cost and locally available source such as Thymelaea hirsuta wood. Characterization of the adsorbent was carried out and BET surface area of the adsorbent was found to be 1496 m2/g. Subsequently, the Thymelaea hirsuta wood activated carbon (TWAC) was applied for the removal of polyvinyl alcohol from aqueous solutions. It was found that adsorption efficiency significantly depend to the level of initial solution pH and polymer concentration, metal addition, temperature, and adsorption time. Among the various conventional isotherm models, Langmuir is more suitable for analyzing the explanation data. The process of removal of polyvinyl alcohol was better governed by second order kinetics with a rate constant of 0.0079 g mg−1 min at initial concentration 20 mg/L. The calculated thermodynamic parameters indicate the entropy‐driven and endothermic nature of polymer adsorption process. For desorption study, more than 86.2% of polyvinyl alcohol could be desorbed from the adsorbent. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 70–79, 2016

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Section: Introductionmentioning

confidence: 99%

Activated carbons prepared from Thymelaea hirsuta wood: Sustainable adsorbents for polyvinyl alcohol

Omri

Benzina

2015

Env Prog and Sustain Energy

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“…[41] Also, EG is easy to be obtained with the chemical method or electrical chemical method by oxidation and the intercalation reaction. [42] Thus, in this study, EG loaded with LaO (EG-LaO) was prepared and examined for phosphate removal.…”

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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“…Sun demonstrated that CF coated with a thin layer of PVA had improved dispersibility and suspending stability in water . Pang reported that PVA molecules absorbed parallel onto the EG surface in the physical adsorption process . Therefore, the hydrophilic nature of CNC combined with the water-soluble PVA molecules would facilitate the dispersion of the CF and EG, and the interactions of CNC with PVA and fibers have been reported in the literature. − …”

Section: Resultsmentioning

confidence: 94%

Aqueous Dispersion of Carbon Fibers and Expanded Graphite Stabilized from the Addition of Cellulose Nanocrystals to Produce Highly Conductive Cellulose Composites

Liu

Sun

et al. 2018

ACS Sustainable Chem. Eng.

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Conductive cellulose composites have received much attention as emerging materials due to their unique properties, such as biodegradability and flexibility. However, the achievable levels of conductivity of these cellulose composites are generally low due to the intrinsically nonconductive properties of cellulose. In this study, cellulose nanocrystals (CNC) were applied for preparation of a carbon fibers/expanded graphite (CF/EG) dispersion which was coated on cellulose paper to prepare highly conductive cellulose composites. Such composite materials were characterized based on transmission electron microscopy (TEM) and field emission scanning electron microscopy (FE-SEM) observation, FT-IR, XPS, and XRD and by determining the zeta potential, particle size, contact angle, and rheological behavior. It was found that the addition of CNC resulted in a significant improvement in the stability of the CF/EG dispersion. These results were explained by the following facts: (1) CNC improved the surface charge of the CF and EG due to the presence of negatively charged groups on the CNC surface, and (2) CNC increased the wettability of the CF and EG due to large availability of hydroxyl groups from CNC. The as-prepared CF/EG/CNC dispersion was then applied by coating cellulose paper surfaces, and the obtained papers presented superior conductivity and high flexibility.

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Adsorption Characteristics of Polyvinyl Alcohols in Solution on Expanded Graphite

Cited by 7 publications

References 17 publications

Activated carbons prepared from Thymelaea hirsuta wood: Sustainable adsorbents for polyvinyl alcohol

Activated carbons prepared from Thymelaea hirsuta wood: Sustainable adsorbents for polyvinyl alcohol

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

Aqueous Dispersion of Carbon Fibers and Expanded Graphite Stabilized from the Addition of Cellulose Nanocrystals to Produce Highly Conductive Cellulose Composites

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