Phenol adsorption equilibrium and kinetics on zeolite X/activated carbon composite

Cheng, Wen; Gao, Wenbo; Cui, Xinyu; Hong, Jing; Li, Rui Feng

doi:10.1016/j.jtice.2016.02.004

Cited by 111 publications

(42 citation statements)

References 29 publications

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“…Conversely, phenol removal was slightly affected by changing the solution pH from 2.0 to 8.0. It was reported that phenol predominantly existed in its undissociated form within the pH region between 2.0 and 8.0; therefore, the adsorption of phenol was insignificantly influenced by the solution pH [3]. A similar trend was previously observed in the removal of phenol as a function of pH using activated carbon fibers and surface functionalized activated sericite [47,48].…”

Section: Effect Of Ph On Hg(ii)/phenol Adsorptionsupporting

confidence: 78%

“…The partly treated or untreated effluents from these industries greatly contaminate the receiving water bodies. Heavy metals and phenolic compounds, which are the most common water pollutants, are found to be highly toxic towards living organisms and are difficult to eliminate from water bodies or even from the biosystem once entered [3][4][5]. Mercury has received greater environmental concern due to its high toxicity, persistence in the environment, and high bioaccumulation [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Lalhmunsiama

Lee

Choi

et al. 2017

Metals

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Areca nut waste was utilized to obtain high surface area activated carbon (AC), and it was further functionalized with succinic anhydride under microwave irradiation. The surface morphology and surface functional groups of the materials were discussed with the help of scanning electron microscope(SEM) images and fourier transform infra-red (FT-IR) analysis. The specific surface area of the AC and functionalized-AC was obtained by the Brunauer-Emmett-Teller (BET) method, and found to be 367.303 and 308.032 m 2 /g, respectively. Batch experiments showed that higher pH favoured the removal of Hg(II), whereas the phenol removal was slightly affected by the changes in the solution pH. The kinetic data followed pseudo-first order kinetic model, and intra-particle diffusion played a significant role in the removal of both pollutants. The maximum sorption capacity of Hg(II) and phenol were evaluated using Langmuir adsorption isotherms, and found to be 11.23 and 5.37 mg/g, respectively. The removal of Hg(II) was significantly suppressed in the presence of chloride ions due to the formation of a HgCl 2 species. The phenol was specifically adsorbed, forming the donor-acceptor complexes or π-π electron interactions at the surface of the solid. Further, a fixed-bed column study was conducted for both Hg(II) and phenol. The loading capacity of the column was estimated using the nonlinear Thomas equation, and found to be 2.49 and 2.70 mg/g, respectively. Therefore, the study showed that functionalized AC obtained from areca nut waste could be employed as a sustainable adsorbent for the simultaneous removal of Hg(II) and phenol from polluted water.

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Section: Effect Of Ph On Hg(ii)/phenol Adsorptionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Lalhmunsiama

Lee

Choi

et al. 2017

Metals

View full text Add to dashboard Cite

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“…The values of q e for PE, ME, IPE, BPA and PPE on a given adsorbent were remarkably distinguished from each other, which increased from 0.271, 0.356, 0.454, 0.4 and 0.70 mmol g −1 on GO to 0.483, 0.841, 1.117, 1.56 and 2.054 mmol g −1 on RGO, respectively. Table 1 presents the existent adsorption capacity of PE and BPA in the presence of different adsorbents [31][32][33][34][35][36]. From Table 1, it was observed that RGO for the adsorption of PE and BPA had a relatively large adsorption capacity among the adsorbents.…”

Section: Effect Of Contact Timementioning

confidence: 99%

Adsorption Characteristics of Phenolic Compounds on Graphene Oxide and Reduced Graphene Oxide: A Batch Experiment Combined Theory Calculation

Wang

Min

et al. 2018

Applied Sciences

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A series of phenolic compounds containing 2-phenylphenol (PPE), bisphenol A (BPA), 4-isopropylphenol (IPE), 4-methylphenol (ME) and phenol (PE) were selected to investigate their major influence factors for their adsorption on graphene oxide (GO) and reduced graphene oxide (RGO) by studying their adsorption isotherms and kinetics. It was found that the adsorption of all tested phenols fitted well with the Freundlich model. In comparison, the adsorption ability of RGO with a stronger π-π interaction was superior to GO, which was confirmed by using naphthalene probe measurements. The thermodynamic characteristics, by studying the effect of the adsorption temperatures (298, 313 and 333 K), demonstrated that the adsorption process was spontaneous, exothermic and entropy-decreasing. The chemical structures of the phenols also affected their adsorption on GO and RGO. It was found that the adsorption capacities of phenols were, in order, PE (0.271 mmol g−1 on GO and 0.483 mmol g−1 on RGO) < ME (0.356 and 0.841 mmol g−1) < IPE (0.454 and 1.117 mmol g−1) < BPA (0.4 and 1.56 mmol g−1) < PPE (0.7 and 2.054 mmol g−1), which depended on the π-electron density of the benzene ring by means of a density functional theory (DFT) calculation. Undoubtedly, the reduction of GO and an increase in π-electron density on the chemical structures of phenols facilitated the adsorption.

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“…Photocatalytic reaction by TiO 2 can usually be described using first-order reaction kinetic equation (Eq. 7) [34,35].…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Facile synthesis of SiO2@TiO2 crystallite photocatalysts with enhanced interaction level and high light absorption efficiency

Dong

Jin

et al. 2017

Nanotechnol. Environ. Eng.

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SiO 2 @TiO 2 crystallite photocatalysts with TiO 2 crystallite core and porous amorphous SiO 2 /TiO 2 shell were synthesized as photocatalyst by one-pot hydrothermal process using tetrabutyl titanate (TBOT) complex and ethyl orthosilicate (TEOS) as Ti and Si sources, respectively. The synthesized SiO 2 @TiO 2 crystallite photocatalysts were characterized by transmission electron microscopy, X-ray diffraction pattern, UV-Vis diffuse reflectance spectrum and N 2 adsorption-desorption isotherm. The interaction between TiO 2 and SiO 2 , which is associated with photocatalytically active centers, is significantly improved through an enlargement in the interfacial area and the optimization of SiO 2 fraction. The SiO 2 modification does not lower the light absorption efficiency of TiO 2 crystallite core owning to the low reflectivity of porous SiO 2 /TiO 2 shell but endows the photocatalyst with easy separation behavior from aqueous solution. Furthermore, the reciprocal inhibition in volume shrinkage of TBOT complex-and TEOS-derived gel networks, as a consequence of mineralization asynchronism, increases the specific surface area and pore volume of the formed SiO 2 / TiO 2 shell. The enhanced photocatalytic activity of SiO 2 @TiO 2 crystallite photocatalysts by SiO 2 modification is mainly ascribed to an increase in the interaction level, the high light absorption efficiency of SiO 2 @TiO 2 crystallite photocatalysts and an enlargement in specific surface area of SiO 2 /TiO 2 shell.

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Phenol adsorption equilibrium and kinetics on zeolite X/activated carbon composite

Cited by 111 publications

References 29 publications

Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Adsorption Characteristics of Phenolic Compounds on Graphene Oxide and Reduced Graphene Oxide: A Batch Experiment Combined Theory Calculation

Facile synthesis of SiO2@TiO2 crystallite photocatalysts with enhanced interaction level and high light absorption efficiency

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