scholarly journals Removal of Cefdinir from Aqueous Solution Using Nanostructure Adsorbents of TiO2, SiO2 and TiO2/SiO2

2019 ◽  
Vol 33 (2) ◽  
pp. 235-248
Author(s):  
H. Banu Yener
Keyword(s):  
Rice Husk Ash ◽  
Control Mechanism ◽  
Reaction Model ◽  
Solution Temperature ◽  
Solution Ph ◽  
Freundlich Model ◽  
Adsorbent Surface ◽  
Adsorbate Concentration ◽  
Langmuir Isotherm Model ◽  
Spontaneous Occurrence

The adsorptive removal of cefdinir, an antibiotic, from aqueous solutions on TiO2, SiO2 and TiO2/SiO2 nanostructures was studied by batch experiments. The SiO2 particles were obtained from rice husk ash. Investigated were the effects of the solution pH, adsorbent dosage, initial adsorbate concentration, and solution temperature on both cefdinir uptake and removal. The studies suggest that the adsorption of cefdinir on the nanostructures was mainly due to the electrostatic interaction between the ionic adsorbate molecules and charged adsorbent surface sites. The adsorption isotherm data of TiO2 and SiO2 fit well to the Langmuir isotherm model and the Freundlich model for TiO2/SiO2. The thermodynamic studies indicated favorable and spontaneous occurrence of adsorption. The kinetic data of TiO2 fitted best with PSO reaction model equation, and was described well by Weber-Morris diffusion model with dominating control mechanism of intraparticle diffusion and limited contribution of internal film diffusion.

scholarly journals Nascent Rice Husk as an Adsorbent for Removing Cationic Dyes from Textile Wastewater

2020 ◽  
Vol 10 (10) ◽  
pp. 3437
Author(s):  
Jude Ofei Quansah ◽  
Thandar Hlaing ◽  
Fritz Ndumbe Lyonga ◽  
Phyo Phyo Kyi ◽  
Seung-Hee Hong ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Rice Husk ◽  
Textile Wastewater ◽  
Cationic Dyes ◽  
Adsorption Model ◽  
Order Model ◽  
Solution Ph ◽  
Freundlich Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

We assessed the applicability of rice husk (RH) to remove cationic dyes, i.e., methylene blue (MB) and crystal violet (CV), from water. RH thermally treated at 75 °C showed a higher adsorption capacity than that at high temperatures (300–700 °C). For a suitable CV-adsorption model, a pseudo-first-order model for MB adsorption was followed by the kinetics adsorption process; however, a pseudo-second-order model was then suggested. In the qt versus t1/2 plot, the MB line passed through the origin, but that of CV did not. The Langmuir isotherm model was better than the Freundlich model for both dye adsorptions; furthermore, the adsorption capacity for MB and CV was 24.48 mg/g and 25.46 mg/g, respectively. Thermodynamically, the adsorption of both MB and CV onto the RH was found to be spontaneous and endothermic. This adsorption increased insignificantly on increasing the solution pH from 4 to 10. With an increasing dosage of the RH, there was an increase in the removal percentages of MB and CV; however, adsorption capacity per unit mass of the RH was observed to decrease. Therefore, we conclude that utilizing RH as an available and affordable adsorbent is feasible to remove MB and CV from wastewater.

scholarly journals The nature and kinetics of 2,4-dimethylphenol adsorption in aqueous solution on biochar derived from Sargassum boveanum macroalgae

2020 ◽  
Vol 69 (5) ◽  
pp. 438-452 ◽  
Author(s):  
Mazen K. Nazal ◽  
Durga Rao ◽  
Nabeel Abuzaid
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Experimental Conditions ◽  
Freundlich Model ◽  
Adsorptive Removal ◽  
Adsorbate Concentration ◽  
Pseudo Second Order ◽  
Kinetics Of

Abstract Many industries produce 2,4-dimethylphenol (DMP) compound in the wastewater which is persistent, toxic, and carcinogenic. Therefore, an adsorbent was prepared by carbonizing a dried Sargassum boveanum macroalgae. The prepared biosorbent was investigated for adsorptive removal of DMP from aqueous solution. After carbonization, the biochar derived from S. boveanum macroalgae (BCM) removed almost 100% of DMP adsorbate. Effects of contact time, solution pH, adsorbate concentration, adsorbent mass, and temperature have been studied. It has been found that, within the experimental conditions, the maximum adsorption capacity is 17 mg/g, rate of adsorption follows pseudo-second order kinetics and the adsorption isotherm experimental data fit the Freundlich model. The thermodynamic parameters were calculated and it has been found that the adsorption of DMP on BCM is endothermic and thermodynamically favorable, and in addition the surface of BCM adsorbent shows affinity to the DMP molecules. The BCM adsorbent has the capability to remove around 65% of DMP from high saline seawater contaminated with DMP. Moreover, the prepared BCM adsorbent was reusable for at least four times in seawater for removal of DMP contaminant.

scholarly journals Uptake of As(V) from Groundwater Using Fe-Mn Oxides Modified Kaolin Clay: Physicochemical Characterization and Adsorption Data Modeling

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1245 ◽  
Author(s):  
Rabelani Mudzielwana ◽  
Mugera Wilson Gitari ◽  
Patrick Ndungu
Keyword(s):  
Arsenic Removal ◽  
Physicochemical Characterization ◽  
Kaolin Clay ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Adsorbate Concentration ◽  
Adsorption Data ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Mn Oxides

The present study evaluated the effectiveness of Fe-Mn modified kaolin clay in the uptake of As(V) from the solution. The elemental composition was characterized using X-ray fluorescence (XRF), while the surface morphology was characterized using Scanning Electron Microscopy (SEM). The surface area, pore diameter, and pore volume were determined using Brunauer, Emmett, and Teller (BET) and Barrett-Joyner-Halenda (BJH) techniques. The efficiency of the Arsenic removal of the adsorbent was evaluated using batch experiments. The results showed that the percentage of As(V) removal is optimum at acidic pH and decreased as the solution pH becomes more alkaline. The adsorption kinetics data fitted better to pseudo-second-order compared to the pseudo-first-order of reaction kinetics. The adsorption isotherm data fitted to the Langmuir isotherm model showing a maximum adsorption capacity of 2.44 mg/g, adsorbate concentration range of 1–30 mg/L, and adsorbent dosage of 0.4 g/100 mL. The value of ∆G° of the thermodynamic parameter was found to be negative, while ∆H° and ∆S° were found to be positive. For the regeneration-reuse study, the percentage of removal was found to be >85% after the sixth cycle of reuse. The results obtained from this study showed that Fe-Mn modified kaolin (FMK) is suitable for use in the uptake of As(V) from groundwater.

Studies on Phosphate Removal from Aqueous Solution by Honeycomb-Cinder Slag

2012 ◽  
Vol 217-219 ◽  
pp. 862-865
Author(s):  
Li Jun Wang ◽  
Hua Yong Zhang ◽  
Lu Yi Zhang
Keyword(s):  
Aqueous Solution ◽  
Phosphate Removal ◽  
Solution Temperature ◽  
Phosphate Adsorption ◽  
Order Model ◽  
Solution Ph ◽  
Initial Ph ◽  
Desorption Study ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

The feasibility of using honeycomb-cinder slag as an adsorbent for phosphate removal from aqueous solution was investigated in batch experiments as a function of initial pH, contact time, adsorbent dose, and solution temperature. The results indicated that the solution pH significantly influenced the phosphate adsorption; 1440 min was enough to reach equilibrium for any concentration. Langmuir isotherm model gave well fit for phosphate adsorption, and the adsorption process followed pseudo second-order model. Desorption study exhibited that the phosphate adsorption on the honeycomb-cinder slag is not completely reversible. Results showed that honeycomb-cinder slag could be used as an adsorbent to uptake phosphate from wastewater.

Dual-temperature and pH responsive (ethylene glycol)-based nanogels via structural design

2014 ◽  
Vol 5 (8) ◽  
pp. 3061-3070 ◽  
Author(s):  
Yohei Kotsuchibashi ◽  
Ravin Narain
Keyword(s):  
Carboxylic Acid ◽  
Ethylene Glycol ◽  
Salt Concentration ◽  
Structural Design ◽  
Solution Temperature ◽  
Ph Responsive ◽  
Solution Ph ◽  
Critical Solution Temperature ◽  
Carboxylic Acid Groups ◽  
The Core

Dual-temperature and pH responsive (ethylene glycol)-based nanogels were synthesized. Both the core and the shell of the nanogels showed a lower critical solution temperature (LCST) and the LCST of the shell was strongly affected by the solution pH and salt concentration due to the presence of carboxylic acid groups at the nanogel surface.

Adsorption of 4-Chloro-2,5-Dimethoxy Nitrobenzene by Activated Pyrolytic Char from Pine Sawdust

2014 ◽  
Vol 884-885 ◽  
pp. 190-194
Author(s):  
Wei Xiao ◽  
Ran Di Zhang ◽  
Yu Bing Song ◽  
Run Ping Han ◽  
Yan Qiang Li
Keyword(s):  
Solution Temperature ◽  
Isotherm Models ◽  
Dihydrogen Phosphate ◽  
Solution Ph ◽  
Pine Sawdust ◽  
Major Mechanism ◽  
Nacl Concentration ◽  
Initial Ph ◽  
Higher Temperature ◽  
Pyrolytic Char

The adsorption studies of 4-chloro-2,5-dimethoxy nitrobenzene (CDNB) from aqueous solution on pyrolytic char activated by ammonium dihydrogen phosphate from pine sawdust have been performed. Several experimental parameters like initial pH, NaCl concentration, contact time solution temperature were evaluated. Solution pH within 2-7 is favor of adsorption and it is advantage of adsorption at higher temperature. Langmuir, Freundlich and Temkin isotherm models were used to fit the experimental data and Temkin model was better. The adsorption capacity was up to 33.8 mg·g1at 323 K. The process is spontaneous and endothermic and physical action is major mechanism.

Synthesis, Characterization and Adsorption Studies of a Graphene Oxide/Polyacrylic Acid Nanocomposite Hydrogel

2021 ◽  
Vol 19 (9) ◽  
pp. 46-54
Author(s):  
Makarim A. Mahdi ◽  
Aymen A.R. Jawad ◽  
Aseel M. Aljeboree ◽  
Layth S. Jasim ◽  
Ayad F. Alkaim
Keyword(s):  
Industrial Effluents ◽  
Langmuir Model ◽  
Isotherm Models ◽  
Nanocomposite Hydrogel ◽  
Adsorption System ◽  
Order Model ◽  
Solution Ph ◽  
Freundlich Model ◽  
Dye Sorption ◽  
Pseudo Second Order

The AAc/GO nanocomposite hydrogel was successfully employed as a polymeric Nano sorbent of the removal efficiency of M G dye from the model. The complication of the mechanism of the adsorption system was completely exposed by examining how solution pH affects adsorption, Ionic strength isotherm models, kinetic models, and thermodynamics. The adsorption of the MG dye was greatly dependent on the solution pH. The Freundlich model has been demonstrated to be the most accurate in describing the MG dye sorption, whilst the Langmuir model was shown to be the least accurate. Additionally, these integrated mechanisms fit nicely within the framework of a pseudo-second-order model. Additionally, the contact time at equilibrium short (ten minutes) required to MG removes demonstrates the AAc/GO nanocomposite hydrogel can be considered an efficient and potentially useful adsorbent for MG removal from industrial effluents.

Patulin adsorption of a superior microorganism strain with low flavour-affection of kiwi fruit juice

2016 ◽  
Vol 9 (2) ◽  
pp. 195-203 ◽  
Author(s):  
Y. Luo ◽  
Z.L. Wang ◽  
Y.H. Yuan ◽  
Z.K. Zhou ◽  
T.L. Yue
Keyword(s):  
Cell Morphology ◽  
Fruit Juice ◽  
Physicochemical Analysis ◽  
Adsorption Behaviour ◽  
Pseudo First Order Reaction ◽  
Kiwi Fruit ◽  
Sorption Behaviour ◽  
Adsorbent Surface ◽  
Langmuir Isotherm Model ◽  
Adsorption Capability

The aim of this study was to isolate a microbial strain with higher patulin adsorption capability and lower flavour-affection on kiwi fruit juice, and study patulin adsorption behaviour effects on cell morphology and adsorption kinetics. Electronic-nose and physicochemical analysis methods were combined to evaluate the flavour and quality of treated kiwi fruit juice. The results showed that yeasts had a good performance on biomass, patulin adsorption and flavour maintenance. Besides, patulin adsorption behaviour and kinetic study of yeast strain N-10 was investigated, the results showed that patulin adsorption capability was influenced by cell morphology, its adsorption behaviour followed pseudo-first-order reaction kinetics, and equilibrium experiments fit the Langmuir isotherm model. The investigation revealed that patulin adsorption is a spontaneous endothermic physic-sorption behaviour. During adsorption, patulin moved from the liquid to the adsorbent surface and the capability of adsorbents was associated with their cell surface morphology. This study provides a basis for the selection of strains with improved patulin adsorption from kiwi fruit juice and provides the experimental foundation and theoretical basis for future studies of patulin adsorption in fruit juice, it has great potential application for the control of patulin in the juice processing industry.

scholarly journals Polymer Composite—A Potential Biomaterial for the Removal of Reactive Dye

2012 ◽  
Vol 9 (4) ◽  
pp. 1823-1834 ◽  
Author(s):  
P. N. Palanisamy ◽  
A. Agalya ◽  
P. Sivakumar
Keyword(s):  
Ion Exchange ◽  
Langmuir Isotherm ◽  
Isosteric Heat ◽  
Reactive Dye ◽  
Isotherm Model ◽  
Batch Adsorption ◽  
Solution Ph ◽  
Saw Dust ◽  
Exchange Adsorption ◽  
Langmuir Isotherm Model

Poly Pyrrle saw dust composite was prepared by reinforcement of natural wood saw dust (obtained fromEuphorbia Tirucalli Lwood) and Poly Pyrrole matrix phase. The present study investigates the adsorption behaviour of Poly Pyrrole Saw dust Composite towards reactive dye. The batch adsorption studies were carried out by varying solution pH, initial dye concentration, contact time and temperature. The kinetic study showed that adsorption of Reactive Red by PPC was best represented by pseudo-second order kinetics with ion exchange adsorption. The equilibrium data were analyzed by Freundlich and Langmuir isotherm model. The equilibrium isotherm data were fitted well with Langmuir isotherm model. The maximum monolayer adsorption capacities calculated by Langmuir model were 204.08 mg/g for Reactive Red at 303 K. The thermodynamic parameters suggest the spontaneous, endothermic nature of ion exchange adsorption with weak Vader walls force of attraction. Activation energy for the adsorption of Reactive by Poly Pyrrole Composite was 11.6387 kJ/mole, Isosteric Heat of adsorption was 48.5454 kJ/mole also supported the ion exchange adsorption process in which forces of attraction between dye molecules and PPC is weak.

scholarly journals Adsorption Studies of Cyanide (CN)- on Rice Husk Ash (RHA)

2011 ◽  
Vol 46 (1) ◽  
pp. 101-104 ◽  
Author(s):  
S Naeem ◽  
U Zafar ◽  
T Amann
Keyword(s):  
Rice Husk ◽  
Contact Time ◽  
Rice Husk Ash ◽  
Cyanide Solution ◽  
Adsorption System ◽  
Solution System ◽  
Adsorbate Concentration ◽  
Adsorption Data ◽  
Batch Technique ◽  
Different Temperatures

In this investigation, adsorption of cyanide has been studied by means of batch-technique. Percentage adsorption was determined for Rice Husk Ash (RHA)-Cyanide solution system as a function of i) contact time, ii) pH, iii) adsorbate concentration and iv) temperature. Adsorption data has been interpreted in terms of Freundlich and Langmuir equations. Thermodynamics parameters for the adsorption system have been determined at three different temperatures. The value of ΔH°=38.326KJ/mole and ΔG°=-6.117KJ/mole at 283°K suggest that the adsorption of cyanide on RHA is an endothermic and a spontaneous process.Key words: Cyanide; Rice husk ash (RHA); Adsorption Isotherms DOI: http://dx.doi.org/10.3329/bjsir.v46i1.3524 Bangladesh J. Sci. Ind. Res. 46(1), 101-104, 2011

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