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Journal ArticleDOI

Continuous Phenol Removal Using a Liquid–Solid Circulating Fluidized Bed

27 Jul 2020-Energies (Multidisciplinary Digital Publishing Institute)-Vol. 13, Iss: 15, pp 3839
TL;DR: In this article, the morphological features and surface chemistry of the adsorbent were analyzed via SEM and FTIR techniques, and the results showed that the phenol removal using the activated-carbon glass beads followed the Langmuir model.
Abstract: A liquid-solid circulating fluidized bed (LSCFB) helps to overcome the shortcomings of conventional fluidized beds by using a particle separation and return system as an integral part of the overall reactor configuration. Batch adsorption experiments were carried out for the removal of phenol from a synthetically prepared solution using fresh activated-carbon-coated glass beads. The morphological features and surface chemistry of the adsorbent were analyzed via SEM and FTIR techniques. The adsorbent dosage, contact time and temperature were varied along with solution pH to assess their effects on the adsorbent performance for phenol removal. Isotherm modeling showed that the phenol removal using the activated-carbon glass beads followed the Langmuir model. Effectively, it was observed at an adsorbent loading of 2.5 g/150 mL of feed volume and a contact time of 3 h produced an 80% efficiency in the batch study. Furthermore, on scaling it up to the column, the desired 98% phenol-removal efficiency was obtained with an adsorbent dosage of 250 g and contact time of 25 min. Adsorbent regeneration using 5% (v/v) ethanol showed a 64% desorption of phenol from the sorbent within 20 min in the LSCFB.
Citations
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Journal ArticleDOI
TL;DR: In this paper, the authors used Hummers' method with minor modification and studied as a potential adsorbent for atrazine removal from simulated wastewater, and the spectroscopy and microscopic analysis confirmed the successful formation of graphene oxide (GO) with a multilayer structure resembling the crumpled sheets with random stacking.

28 citations

Journal ArticleDOI
TL;DR: In this paper , the authors focus on the progress of algae removing phenols by different mechanisms and the potential of algae biomass for further biofuel production, focusing on the environmental impact of several types of phenolic pollutants in wastewater and different strategies to improve bioremediation efficiency.

19 citations

Journal ArticleDOI
TL;DR: In this article, a liquid-solid fluidized bed with nutshell activated carbon was used to adsorb copper ions from wastewater, and the results showed that the adsorption saturations of the fluidized and packed bed were 0.694 and 0.660 g/g, respectively.

12 citations

Journal ArticleDOI
TL;DR: In this paper , a novel biocomposite of biosilica (BS)/silk fibroin (SF)/polyurethane foam (PUF) was prepared and studied for the adsorptive recovery of toxic copper (Cu 2 + ) and chromium (Cr 6+ ) ions from synthetic wastewater.
Abstract: Development of green, eco-friendly, and efficient adsorbents for wastewater treatment is highly researched to mitigate the alarming rate of water pollution. In this work, a novel biocomposite of biosilica (BS)/silk fibroin (SF)/polyurethane foam (PUF) was prepared and studied for the adsorptive recovery of toxic copper (Cu 2 + ) and chromium (Cr 6+ ) ions from synthetic wastewater. XRD and FTIR studies confirmed the formation of biocomposite with amorphous structure and –OH, –NH, C=O surface functionalities. SEM results confirmed the successful incorporation of SF and PUF into BS. The biocomposite possessed a specific surface area of 751.9 m 2 /g and a mean pore size of 7.21 nm. Further, effects of pH, adsorbent dose, contact time, and initial metal ion concentration on the adsorptive removal of Cu 2 + and Cr 6+ metal ions by the BS/SF/PUF biocomposite were studied in detail. Equilibrium and kinetic analysis showed that the metal ions sequestration by the BS/SF/PUF biocomposite followed the Freundlich isotherm and Elovich model, respectively. Maximum adsorption capacities of 331.69 mg/g and 201.56 mg/g were estimated for the Cu 2 + and Cr 6+ ions, respectively. A plausible mechanism for the adsorption of the metal ions onto BS/SF/PUF biocomposite is postulated. Reusability studies of the biocomposite using EDTA eluent showed that the biocomposite could be efficiently reused up to four consecutive adsorption/desorption cycles. Thus, this study provides comprehensive data for applying the BS/SF/PUF biocomposite to treat Cu 2 + and Cr 6+ metal ions polluted wastewater streams. • Amorphous BS/SF/PUF biocomposite was prepared through polymer blending. • Specific surface area and pore size of BS/SF/PUF were 751.9 m 2 /g and 7.21 nm. • High adsorptive removal efficiency of >80% for Cu 2+ and Cr 6+ heavy metal ions. • Freundlich isotherm & Elovich kinetic model best described adsorption operation. • BS/SF/PUF biocomposite was successfully reused up to 4 cycles through EDTA washing.

11 citations

Journal ArticleDOI
TL;DR: In this paper , coal gangue-based zeolite granules in a fluidized absorber were used to study the adsorption mechanism of methylene blue (MB) pollution in wastewater.

7 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the authors present a review of the state-of-the-art in isotherm modeling, its fundamental characteristics and mathematical derivations, as well as the key advance of the error functions, its utilization principles together with the comparisons of linearized and nonlinearized isotherms models have been highlighted and discussed.

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Journal ArticleDOI
TL;DR: In this article, a review of fixed-bed column studies for removal of various contaminants from synthetic wastewater is presented, in which adsorption of chromium metal is most exploitable.
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Journal ArticleDOI
Jiyun Song1, Weihua Zou1, Yangyang Bian1, Fengyun Su1, Runping Han1 
TL;DR: In this paper, the authors described adsorption of methylene blue (MB) by peanut husk in batch and fixed-bed column modes at 293 K. Nonlinear regressive method was used to obtain relative parameters of adaption models.

261 citations

Journal ArticleDOI
TL;DR: In this article, adsorption studies were made in treating the dye solutions of methylene blue (M-B) and Congo red (CR) textile dyes by using flyash.

219 citations

Journal ArticleDOI
TL;DR: In this paper, magnetite nanoparticles synthesized in the laboratory were used for the removal of Hexavalent chromium (Cr (VI)) from synthetically prepared wastewater using scanning electron microscopy equipped with energy dispersive X-Ray spectroscopy, X ray diffraction and thermogravimetric analyzer.

188 citations