Ultrasound and microwave-assisted preparation of Fe-activated carbon as an effective low-cost adsorbent for dyes wastewater treatment

Cheng, Song; Zhang, Libo; Xia, Hongying; Peng, Jinhui; Shu, Jianhua; Li, Chunyang

doi:10.1039/c6ra14082c

Cited by 47 publications

(16 citation statements)

References 56 publications

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“…Instead land application, adsorption is considered to be a simple and effective technique for the removal of nutrients from the wastewater. To remove organic contaminations from wastewater, some commonly used adsorbents are activated carbon[ 8 , 9 ], clay minerals [ 10 , 11 ], chemical amendment[ 12 , 13 ], biochar[ 14 , 15 ], and zeolites[ 16 – 18 ]. Among those adsorbents, zeolites are widely applied for the purpose of reusing the effluent water, reducing pollution of water resources, reducing gas emissions through modifying the physiochemical properties of manure and decreasing water consumption[ 19 – 21 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the adsorption of nitrogen and phosphorus from biogas slurry by NaCl-modified zeolite

Cheng

et al. 2017

PLoS ONE

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A NaCl-modified zeolite was used to simultaneously remove nitrogen and phosphate from biogas slurry. The effect of pH, contact time and dosage of absorbants on the removal efficiency of nitrogen and phosphate were studied. The results showed that the highest removal efficiency of NH4+-N (92.13%) and PO43−-P (90.3%) were achieved at pH 8. While the zeolite doses ranged from 0.5 to 5 g/100 ml, NH4+-N and PO43−-P removal efficiencies ranged from 5.19% to 94.94% and 72.16% to 91.63% respectively. The adsorption isotherms of N and P removal with NaCl-modified zeolite were well described by Langmuir models, suggesting the homogeneous sorption mechanisms. While through intra-particle diffusion model to analyze the influence of contact time, it showed that the adsorption process of NH4+-N and PO43−-P followed the second step of intra-particle diffusion model. The surface diffusion adsorption step was very fast which was finished in a short time.

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Section: Introductionmentioning

confidence: 99%

Study on the adsorption of nitrogen and phosphorus from biogas slurry by NaCl-modified zeolite

Cheng

et al. 2017

PLoS ONE

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“…In addition, another important parameter of Langmuir model can be employed to estimate the feasibility of adsorption on adsorbent and was defined as dimensionless factor R L , it was expressed as follow:RL=11+kLC0 where C0 was the initial concentration of Ag + . The value of R L was considered relevant with the degree of adsorption: it was unfavorable with R L more than 1; it was favorable with 0 < R L < 1; it was linear with R L = 1 and it was irreversible with R L = 0 [28]. In the paper, the calculated values of R L for Ag + onto TSC-CC resin were in range of 0.0177 to 0.0406 indicating that TSC-CC resin was suitable for the adsorption of Ag + .…”

Section: Resultsmentioning

confidence: 99%

Selective Adsorption of Ag+ on a New Cyanuric-Thiosemicarbazide Chelating Resin with High Capacity from Acid Solutions

et al. 2017

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Abstract:A new cyanuric-thiosemicarbazid (TSC-CC) chelating resin was synthesized and employed to selectively adsorb Ag + from acid solutions. The effects of acid concentration, initial concentration of Ag + , contact time and coexisting ions were investigated. The optimal acid concentration was 0.5 mol/L. The adsorption capacity of Ag + reached 872.63 mg/g at acid concentration of 0.5 mol/L. The adsorption isotherm was fitted well with the Langmuir isotherm model and the kinetic data preferably followed the pseudo-second order model. The chelating resin showed a good selectivity for the Ag + adsorption from acid solutions. Fourier transform infrared (FT-IR), X-ray diffraction (XRD), Scanning electron microscopy/energy dispersive spectrometer (SEM-EDS) and X-ray photoelectron spectroscopy (XPS) were used to study the adsorption mechanism. The chelating and ionic interaction was mainly adsorption mechanism. The adsorbent presents a great potential in selective recovery Ag + from acid solutions due to the advantage of high adsorption capacity and adapting strongly acidic condition. The recyclability indicated that the (TSC-CC) resin had a good stability and can be recycled as a promising agent for removal of Ag + .

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“…Let A, A * denote a Leonard pair on V. We can determine whether A, A * is self-dua By [ i= denote a standard ordering of the eigenvalues of A. Then A, A * is self-du is a standard ordering of the eigenvalues of A * (see [7,Proposition 8.7]).…”

Section: Introductionmentioning

confidence: 99%

“…The conventional techniques include coagulation [4], hyperfiltration [5], chemical oxidation [6], filter binding assay [7], biosorption [8], and ozonation [9]. However, these approaches lack the expected degree of effectiveness technologically as well as economically.…”

Section: Introductionmentioning

confidence: 99%

Waste phenolic resin derived activated carbon by microwave-assisted KOH activation and application to dye wastewater treatment

Cheng

Xia

et al. 2019

Green Processing and Synthesis

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The waste phenolic resin was utilized as the raw material to prepare activated carbon (AC) used KOH as the activating agent via microwave heating. The phenolic resin was carbonized at 500°C and then performed with a KOH/Char ratio of 4 and microwave power of 700 W for a duration of 15 min. The physic-chemical characteristics of the AC were characterized by N2 adsorption instrument, FTIR, SEM and TEM. The BET surface area and pore volume of AC were found to be 4269 m2/g and 2.396 ml/g, respectively. The activation process to generate such a phenomenally high surface area of the AC has little reported in open literatures and could pave way for preparation adsorbents that are far superior to the currently marketed adsorbents. The methylene blue (MB) was used as the model to assess its suitability to dye wastewater treatment. Towards this, the MB adsorption isotherms were conducted at three different temperatures and tested with different adsorption isotherm models. The adsorption isotherms could be modeled using Langmuir isotherm. While the kinetics could be used the pseudo-second order kinetics to describe. Thermodynamic results demonstrated that the adsorption process was a spontaneous, as well as an endothermic.

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Ultrasound and microwave-assisted preparation of Fe-activated carbon as an effective low-cost adsorbent for dyes wastewater treatment

Abstract: A and B are Langmuir isotherm and pseudo-second-order model. We conclude that MB adsorption capacity of Fe-activated carbon is bigger than raw activated carbon, indicating that Fe-activated carbon has better MB removal efficiency.

Cited by 47 publications

References 56 publications

Study on the adsorption of nitrogen and phosphorus from biogas slurry by NaCl-modified zeolite

Study on the adsorption of nitrogen and phosphorus from biogas slurry by NaCl-modified zeolite

Selective Adsorption of Ag+ on a New Cyanuric-Thiosemicarbazide Chelating Resin with High Capacity from Acid Solutions

Waste phenolic resin derived activated carbon by microwave-assisted KOH activation and application to dye wastewater treatment

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