scholarly journals Determination Of Adsorption Performance Of Hydrothermally Synthesized Nanocomposite

2019 ◽  
Vol 2 (3) ◽  
pp. 1218-1223
Author(s):  
Hasan Sayğılı
Keyword(s):  
Adsorption Isotherms ◽  
Adsorption Mechanism ◽  
Organic Dyes ◽  
Hydrothermal Process ◽  
Freundlich Isotherm ◽  
One Pot ◽  
Isotherm Equation ◽  
Adsorption Capacities ◽  
Langmuir Isotherm Equation

In this study, a novel nanocomposite was synthesized by a simple one-pot hydrothermal process and used as an adsorbent for the removal of methylene blue (MB) and methyl orange (MO) dyes from the aqueous medium. Overall findings from batch experiments demonstrated that the prepared nanocomposite material (Fe/GBHC) had good adsorption capacity for MB and MO. The maximum adsorption capacities of the Fe/GBHC were observed to be 11 mg/g for MB and 8.9 mg/g for MO at neutral pH of the solutions and at 303 K. To obtain the adsorption mechanism of the Fe/GBHC, the experiments of adsorption isotherms were researched. The adsorption isotherms of both dyes could be described by the Langmuir isotherm equation rather than the Freundlich isotherm equation, with a high correlation coefficient values. The results showed that the prepared Fe/GBHC material by the hydrothermal method could have potential application in the removal of organic dyes from waste water.

Determination of adsorption isotherms by means of HPLC: Adsorption mechanism elucidation and separation optimization

2009 ◽  
pp. NA-NA ◽  
Author(s):  
Nicola Marchetti ◽  
Alberto Cavazzini ◽  
Luisa Pasti ◽  
Francesco Dondi
Keyword(s):  
Adsorption Isotherms ◽  
Adsorption Mechanism

Adsorption of Phosphorus by Lithium Silica Fume

2013 ◽  
Vol 368-370 ◽  
pp. 692-696
Author(s):  
Wei Lan Lin ◽  
Jin Chuan Gu ◽  
Yu Heng Wang ◽  
Wen Yuan Wang
Keyword(s):  
Silica Fume ◽  
Adsorption Kinetics ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Good Method ◽  
Order Equation ◽  
Isotherm Equation ◽  
Dosage Effects ◽  
Adsorption Capacities ◽  
Pseudo Second Order

adsorption is a good method to remove phosphorus. In the experiment, lithium silica fume is used as the adsorption material, adsorption isotherms ,kinetics and dosage effects were examined. It shows that the adsorption kinetics data are consistent with the pseudo-second-order equation and the adsorption is easy to happen. Freundlich isotherm equation is fit for description of the adsorption. The maximum adsorption capacities on lithium silica fume is 1.166 mg/g. When dosage get to 12 g/l and the concentration of phosphorus solution is 2 mg/l, the removal rate reach to 95% at 308k.

scholarly journals The influence of ozonation on the activated carbon adsorption of phenol and humic acid

2007 ◽  
Vol 9 (4) ◽  
pp. 107-110 ◽  
Author(s):  
Bożena Seredyńska-Sobecka ◽  
Maria Tomaszewska
Keyword(s):  
Activated Carbon ◽  
Humic Acid ◽  
Oxygen Demand ◽  
Freundlich Isotherm ◽  
Model Solution ◽  
Activated Carbon Adsorption ◽  
Phenol Adsorption ◽  
Isotherm Equation ◽  
Carbon Adsorption

The influence of ozonation on the activated carbon adsorption of phenol and humic acid To study the influence of ozonation on the activated carbon adsorption, a model solution containing approximately 8 mg/dm3 of humic acid and approximately 1 mg/dm3 of phenol has been ozonated, and then adsorption kintetics and adsorption isotherm experiments have been performed. The applied ozone doses ranged from 1 to 3 mg O3/dm3, and a contact time was 1 min. In the adsorption experiments, the commercial activated carbon CWZ-30 (Gryfskand Sp. z o.o., Hajnówka, Poland) has been used. Phenol adsorption under equilibrium conditions was determined by the Freundlich isotherm equation, and the modified Freudlich isotherm equation has been employed for the determination of humic acid equilibrium adsorption. The applied oxidation conditions resulted in color, chemical oxygen demand (COD), total organic carbon (TOC) and UV254 absorbance removal, by 4 - 13%, 3 - 6%, 3 - 7%, respectively. After ozonation, phenol concentration decreased by 6 - 23%. These changes in the model solution did not affect the humic acid adsorption, however, they deteriorated phenol adsorption.

scholarly journals Simultaneous adsorption of Cd2+ , Ni2+ and Pb2+ on peat

2019 ◽  
pp. 269-277 ◽  
Author(s):  
Ulis L. Söukand ◽  
Pille Kängsepp ◽  
Renata Söukand ◽  
Toomas Tenno
Keyword(s):  
Langmuir Isotherm ◽  
Adsorption Mechanism ◽  
Filter Material ◽  
Adsorption Efficiency ◽  
Isotherm Equation ◽  
Metal Solution ◽  
Molar Basis ◽  
Removal Of Heavy Metals ◽  
Langmuir Isotherm Equation ◽  
Ternary Metal

The aim of the present work was to investigate iflocally available untreated peat could beused as filter material for the removal of heavy metals from leachate. The aqueoussolutions containing Cd2+, Ni2+ and Pb2+ ions in single-metal and multi-metal solutionswere used to study the adsorption of metals on peat. The peat was obtained fromSouthern Estonia. The decomposition rate of the peat was H6-H7 on the von Post scale.In order to assess the adsorption mechanism, the amounts of Ca2+ and Mg2+ ions desorbedfrom untreated peat were measured and compared to the adsorption efficiency of Cd2+,Ni2+ and Pb2+ ions from solution on the peat. The desorption of other cations, such asAl3+, K+, Na+, Fe3+, Zn2+ etc. were negligible during all experiments. Adsorption batchisotherm studies were carried out by using IO experimental series with the initialconcentration of 10 - 300 mg/I. The samples were analyzed by using the axial ICP-AES.Results of the single- as well as multi-metal adsorptions show that peat can be effectivelyused. Adsorption of metals on molar basis was found in the indicated order: Pb2+ > Cd2+> Ni2+. The removal of single metal ions from ternary-metal solution was less than itsremoval from single-metal solution. However, the total adsorption capacity of metalsfrom multi-metal solution to peat increased. The Langmuir isotherm equation constantswere calculated and isotherms were drawn by using the program of calculating hyperbolefunctions. Correlations for Ni2+ and Cd2+ with the Langmuir isotherm equation was foundto be good, whereas for Pb2+ the plot (amount absorbed vs. the equilibrium aqueousconcentration) was linear.

Preparation and Chelating Properties of Polystyrene Modified Ethoxycarbonyl Thiourea Resin

2011 ◽  
Vol 239-242 ◽  
pp. 781-785 ◽  
Author(s):  
Shuai Wang ◽  
Hong Zhong ◽  
Liu Yin Xia ◽  
Zhong Nan Wang ◽  
Qian Zhang
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Maximum Adsorption Capacity ◽  
Polymer Grafting ◽  
Isotherm Equation ◽  
Adsorption Capacities ◽  
Adsorption Data ◽  
Separation Factors ◽  
Langmuir Isotherm Equation ◽  
Freundlich Adsorption Isotherm

A novel polystyrene modified ethoxycarbonyl thiourea resin(PSETU) was synthesized by polymer grafting of aminated polystyrene and ethoxycarbonyl isothiocyanate. The adsorption capacities of PSETU follow the order: Au(III) > Cu(II) > Zn(II) > Ni(II) > Fe(III) > Ca(II) ≈ Mg(II). The adsorption capacity for Au(III) increases with the increase of contact time, temperature and initial concentration of Au(III). The adsorption data fit Boyd’s diffusion equation of liquid film, Langmuir adsorption isotherm and Freundlich adsorption isotherm. The maximum adsorption capacity of PSETU calculated by Langmuir isotherm equation is 3.485 mmol/g, and the separation factors of PSETU for Au(III)-base metal ions are above 380. According to XPS results, the functional atoms of PSETU coordinate with Au(III) during the adsorption process.

One-Pot Hydrothermal Synthesis of g-C3N4/BiPO4 Nanocomposites with Significant Photocatalytic Activity

2020 ◽  
Vol 20 (5) ◽  
pp. 3047-3052 ◽  
Author(s):  
Zhen-Zhao Pei ◽  
Pei Wang ◽  
Chao-Yang Li ◽  
Xiao-Liang Li ◽  
Yong-Wu He ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Diffuse Reflectance ◽  
Organic Dyes ◽  
Hydrothermal Process ◽  
Simulated Sunlight ◽  
X Ray Diffraction ◽  
One Pot ◽  
Sunlight Irradiation ◽  
X Ray ◽  
Scanning Electron

The g-C3N4/BiPO4 composites have been successfully synthesized via a one-pot hydrothermal process, which can be used to degrade the organic dyes (rhodamine B and methylene blue) under simulated sunlight irradiation. X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis diffuse reflectance spectra and Fourier transform infrared (FTIR) spectroscopy have been employed to characterize the samples. The g-C3N4/BiPO4 composites exhibited higher photocatalytic activity than pure BiPO4. And the optimum photocatalyst shows the outstanding photocatalytic activity, which exhibited 99.0% and 86.6% decolorization rate of RhB and MB, respectively.

scholarly journals Cadmium Adsorption on HDTMA Modified Montmorillionite

2009 ◽  
Vol 6 (1) ◽  
pp. 8 ◽  
Author(s):  
Mohd. Elmuntasir I. Ahmed
Keyword(s):  
Exchange Capacity ◽  
Batch Adsorption ◽  
Cadmium Removal ◽  
Surface Precipitation ◽  
Isotherm Equation ◽  
Modified Montmorillonite ◽  
Adsorption Capacities ◽  
Langmuir Isotherm Equation ◽  
High Concentrations ◽  
Monolayer Coverage

In this paper the possibility of cadmium removal from aqueous solutions by adsorption onto modified montmorillonite clay is investigated. Batch adsorption experiments performed revealed an enhanced removal of cadmium using HDTMA modified montmorillonite to 100% of its exchange capacity. Modified montmorillonite adsorption capacity increases at higher pHs suggesting adsorption occurs as a result of surface precipitation and HDTMA complex formation due to the fact that the original negatively charged montmorillonite is now covered by a cationic layer of HDTMA. Adsorption isotherms generated followed a Langmuir isotherm equation possibly indicating a monolayer coverage. Adsorption capacities of up to 49 mg/g and removals greater than 90% were achieved. Anionic selectivity of the HDTMA modified monmorillonite is particularly advantageous in water treatment applications where high concentrations of less adsorbable species are present, and the lack of organoclay affinity for these species may allow the available capacity to be utilized selectively by the targeted species. 

Determination of the degree of adsorption and the heat of adsorption for 1-butylamine and ammonia on NaHY zeolites

1984 ◽  
Vol 49 (12) ◽  
pp. 2739-2743 ◽  
Author(s):  
Miloslav Křivánek ◽  
Pavel Jírů
Keyword(s):  
Lewis Acid ◽  
Adsorption Isotherms ◽  
Heat Of Adsorption ◽  
Brønsted And Lewis Acid

The degree and heat of adsorption of 1-butylamine and ammonia were measured on samples of NaHY zeolites activated at 400-600°C. The adsorption isotherms and calorimetric curves were compared for the two bases, and the amount of Bronsted and Lewis acid centres was determined from the calorimetric curves.

scholarly journals Dual-emission ratio fluorescence for selective and sensitive detection of ferric ions and ascorbic acid based on one-pot synthesis of glutathione protected gold nanoclusters

RSC Advances ◽  
2021 ◽  
Vol 11 (28) ◽  
pp. 17283-17290
Author(s):  
Shuai Zhang ◽  
Cong Zhang ◽  
Xiaodong Shao ◽  
Rentian Guan ◽  
Yingying Hu ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Gold Nanoclusters ◽  
Sensitive Detection ◽  
Dual Fluorescence ◽  
Ferric Ions ◽  
Fluorometric Method ◽  
One Pot ◽  
Dual Emission ◽  
One Pot Synthesis

A fluorometric method was proposed for the determination of Fe3+ and ascorbic acid (AA) based on blue and red dual fluorescence emissions of glutathione (GSH) stabilized-gold nanoclusters (AuNCs).

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