Synthesis of hierarchical porous zinc oxide (ZnO) microspheres with highly efficient adsorption of Congo red

Lei, Chunsheng; Pi, Meng; Jiang, Chuanjia; Cheng, Bei; Yu, Jiaguo

doi:10.1016/j.jcis.2016.11.049

Cited by 292 publications

(93 citation statements)

References 67 publications

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“…2) and Freundlich (Eq. 3) models give the best fit [36][37][38][39][40][41][42], hence in this work only the two models were used to interpret the data. where q e is the equilibrium dye concentration on the adsorbent (mg g −1 ), c e is the equilibrium dye concentration in solution (mg dm −3 ), q max is the monolayer capacity of the adsorbent (mg g −1 ), and b is the Langmuir adsorption constant (dm 3 mg −1 ).…”

Section: Removal Of Phenol and Congo Redmentioning

confidence: 99%

Tailoring mesoporosity of poly(furfuryl alcohol)-based activated carbons and their ability to adsorb organic compounds from water

Lorenc-Grabowska

Rutkowski

2018

J Mater Cycles Waste Manag

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In this work it was shown that polymers can be recycled into a promising adsorbent for organic dyes and phenols waste removal. For this, a series of activated carbons (ACs) were produced from mixture of ferrocene or titanium acetylacetonate with poly(furfuryl alcohol) (PFA) by steam activation. The introduction of ferrocene as Fe precursor was found to be an efficient catalyst in mesoporosity development during carbonization and subsequent steam activation at 850 °C, whereas the polymer based only and titanium-doped ACs are typically microporous. The porous structure parameters were determined from nitrogen adsorption isotherms measured at 77 K. Scanning electron microscopy was applied to monitor the metal distribution of metal-loaded char and the surface morphology of activated carbons. The adsorption capacity was found to be dependent mainly on pore size distribution. In the case of phenol adsorption, the adsorption was defined by volume of pore with size 0.8-1.4 nm; whereas, for Congo red best fit was observed for volume of pore with size 2-5 nm.

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Section: Removal Of Phenol and Congo Redmentioning

confidence: 99%

Tailoring mesoporosity of poly(furfuryl alcohol)-based activated carbons and their ability to adsorb organic compounds from water

Lorenc-Grabowska

Rutkowski

2018

J Mater Cycles Waste Manag

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“…model that best described the adsorption kinetics), R is the gas constant (8.3145 J/mole.K), and K c is the equilibrium constant at temperature T. The activation energy can be determined from the slope of the linear plot of ln(k 2 ) vs 1/T by using (5). The values of ΔH and ΔS can be obtained from the slope and intercept of the linear plot of ln(K c =C ad,e /C e ) vs 1/T, respectively, according to (7). The calculated thermodynamic parameters were presented in Table III.…”

Section: B) Mass Transfer Modellingmentioning

confidence: 99%

“…In this regard, the hierarchical flower-like ZnO particles (FL-ZnO) were synthesized by the facile hydrothermal method without organic solvent and were characterized by XRD, SEM, and EDX analysis. In the literature, conventional crystalline ZnO structures have been widely utilized as adsorbents for the removal of many pollutants [3], [7], [8]; but there is a limited number of studies about the adsorption on hierarchical ZnO structures and lately, the wastewater treatment studies with hierarchical ZnO structures have triggered investigation enthusiasm. Therefore; in this work, the synthesized flower-like ZnO particles were evaluated as adsorbents in the adsorption of both the anionic (Sunset Yellow) and the cationic (Malachite Green) dyestuffs, and the equilibrium, kinetics, mass transfer, and thermodynamic studies were done.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Hierarchical Flower-Like ZnO Particles as Effective Adsorbent and Antibacterial Agent

Karagöz¹,

Mersin²,

Uzunoğlu³

et al. 2017

IJCEA

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Abstract-In present work, hierarchical flower-like ZnO particles (FL-ZnO) were synthesized by organic-free hydrothermal route. The hexagonal structure and the formation of flower-like structure of FL-ZnO were observed by XRD and SEM analysis, respectively. The adsorption capability of FL-ZnO for the anionic (Sunset Yellow) and cationic (Malachite Green) dyes was investigated in a batch process. The effects of initial pH, initial dye concentration, temperature, and adsorbent concentration on the studied adsorption processes were also evaluated and the results showed that the studied adsorption systems were noticeably dependent of initial pH in the experimental range. The adsorption mechanism was described by the equilibrium, kinetic, and mass transfer modelling. The results showed that the experimental equilibrium data for both dyestuff were fitted well to Langmuir isotherm model, the studied adsorption kinetics were in the best agreement with the pseudo second order model, both intraparticle and film diffusion were effective on the studied adsorption systems as to Weber-Morris model. Besides, the antibacterial activities of FL-ZnO for the gram negative Escherichia-coli (O157: H7) and the gram positive Listeria monocytogenes were tested.Index Terms-Adsorption, adsorbent, antibacterial activity, hierarchical flower-like ZnO, metal oxide materials.

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“…According to Merck ® safety information, CR may cause cancer and possible risk of damage to the human fetus (Merck Material Safety Data Sheet) [9]. CR is highly soluble in water, has high resistance to the temperature and sunlight, and is stable against the biological and chemical degradation [10].…”

Section: Introductionmentioning

confidence: 99%

“…Among these methods, adsorption is the most convenient and promising strategy due to the easy operation, high efficiency, low energy requirement, and easy recovery or reuse of the adsorbent [10,13]. Compared to other adsorbents for dye removal, magnetic materials possessed many advantages such as chemical stability, nontoxic synthesis, environmentally friendly, low cost and facile separation from the water solution [14,15].…”

Section: Introductionmentioning

confidence: 99%

One-pot synthesis of S-doped Fe2O3/C magnetic nanocomposite as an adsorbent for anionic dye removal: equilibrium and kinetic studies

Khoshsang

Ghaffarinejad

Kazemi³

et al. 2017

J Nanostruct Chem

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Novel S-doped Fe 2 O 3 /C nanocomposite was synthesized via a one-pot hydrothermal method and was used for the first time as an efficient adsorbent for Congo red dye (CR) removal from water solution. The obtained catalyst was characterized by various methods including Fourier transform infrared spectroscopy, energy dispersive X-ray spectrometry, vibration sample magnetometry, X-ray diffraction and field emission scanning electron microscopy. To improve the adsorption performance, some important parameters affecting dye removal were optimized such as adsorbent dosage, contact time, solution pH, initial dye concentration and ionic strength. At the optimum conditions, the maximum capacity of adsorption for this nanocomposite was 270.2 mg g −1 , which is better than other magnetic adsorbents for CR removal. The results of adsorption isotherm were matched with Langmuir model. Kinetic tests show that adsorption experimental data were best fitted by pseudo-first-order model. Graphical abstract

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Synthesis of hierarchical porous zinc oxide (ZnO) microspheres with highly efficient adsorption of Congo red

Cited by 292 publications

References 67 publications

Tailoring mesoporosity of poly(furfuryl alcohol)-based activated carbons and their ability to adsorb organic compounds from water

Tailoring mesoporosity of poly(furfuryl alcohol)-based activated carbons and their ability to adsorb organic compounds from water

Synthesis and Characterization of Hierarchical Flower-Like ZnO Particles as Effective Adsorbent and Antibacterial Agent

One-pot synthesis of S-doped Fe2O3/C magnetic nanocomposite as an adsorbent for anionic dye removal: equilibrium and kinetic studies

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