scholarly journals Adsorption of Zirconium Ions by X-Type Zeolite

2021 ◽  
Vol 11 (5) ◽  
pp. 13421-13431
Keyword(s):  
Filter Cake ◽  
Nonlinear Approximation ◽  
Fluorescence Analysis ◽  
Batch Mode ◽  
Adsorption Theory ◽  
Adsorption Data ◽  
Alumina Oxide ◽  
Type Zeolite ◽  
Equilibrium Concentrations ◽  
Solution Acidity

Dependence of zirconium adsorption value on agitation time, solution acidity, equilibrium concentrations of zirconium cations, and zeolite NaX particle size was investigated. The two most common adsorption theories Langmuir and Freundlich, were used to analyzing equilibrium adsorption data. Nonlinear approximation shows that the Freundlich adsorption theory provides higher R2 and lower χ2 for zirconium adsorption by NaX than the Langmuir adsorption theory. Experimental maximum adsorption values of NaX toward zirconium and strontium cations are 75 mg·g-1 and 156 mg·g-1, respectively. The desorption studies of zirconium ions from the surface of NaX by 1% oxalic acid and 10% HNO3 were performed. Degradation of the adsorbent in nitric acid was studied in a batch mode. The recovered suspended particles filter cake was investigated by X-ray fluorescence analysis. Alumina oxide (Al2O3) fraction decreases, and MgO is completely washed out from the adsorbent matrix in concentrated HNO3.

scholarly journals Ricinus CommunisPericarp Activated Carbon Used as an Adsorbent for the Removal of Ni(II) From Aqueous Solution

2008 ◽  
Vol 5 (4) ◽  
pp. 761-769 ◽  
Author(s):  
S. Madhavakrishnan ◽  
K. Manickavasagam ◽  
K. Rasappan ◽  
P. S. Syed Shabudeen ◽  
R. Venkatesh ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Activated Carbon ◽  
Contact Time ◽  
Metal Ion ◽  
Ricinus Communis ◽  
Ion Concentration ◽  
Batch Mode ◽  
Adsorption Data ◽  
Initial Ph

Activated carbon prepared from Ricinus communis Pericarp was used to remove Ni(II) from aqueous solution by adsorption. Batch mode adsorption experiments are carried out by varying contact time, metal-ion concentration, carbon concentration and pH to assess kinetic and equilibrium parameters. The adsorption data were modeled by using both Langmuir and Freundlich classical adsorption isotherms. The adsorption capacity (Qo) calculated from the Langmuir isotherm was 31.15 mg/g of activated carbon at initial pH of 5.0±0.2 for the particle size 125-250 µm.

Reduction of COD from Micro-Polluted Water through Adsorption of Activated Carbon-Attapulgite Composite Adsorbent

2010 ◽  
Vol 450 ◽  
pp. 445-448
Author(s):  
Zheng Wang ◽  
Zhao Qian Jing ◽  
Yu Kong ◽  
Wei Shen
Keyword(s):  
Activated Carbon ◽  
Oxygen Demand ◽  
Polluted Water ◽  
Adsorption Model ◽  
Batch Mode ◽  
Composite Adsorbent ◽  
Adsorption Data ◽  
Complete Study ◽  
Ph Range ◽  
Optimum Ph Range

The aim of this study was the assessment of reduction of chemical oxygen demand (COD) from micro-polluted water using activated carbon-attapulgite composite adsorbent prepared using activated carbon and natural attapulgite through compounding, granulation and calcination. The complete study was done in batch mode to investigate the effect of operating parameters. Adsorption of COD was found to be dependent on contact time, pH, temperature and initial COD concentration. Adsorption equilibrium attained within 80 minutes time. The optimum pH range for adsorption of organics was found to be 8. The sorption of organics decreased with rise of temperature because adsorption process was exothermic. The studied adsorption data fitted well to Langmuir adsorption model with the correlation coefficient 0.9947. The activated carbon-attapulgite composite adsorbent in this study shows very good promise for practical applicability on removal of COD from micro-polluted water.

ADSORPTION OF ACID ORANGE 7 BY CETYLPYRIDINIUM BROMIDE MODIFIED SUGARCANE BAGASSE

2016 ◽  
Vol 78 (1-2) ◽  
Author(s):  
Nik Ahmad Nizam Nik Malek ◽  
Nurain Mat Sihat ◽  
Mahmud A. S. Khalifa ◽  
Auni Afiqah Kamaru ◽  
Nor Suriani Sani
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Sugarcane Bagasse ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Acid Orange 7 ◽  
Cetylpyridinium Bromide ◽  
Batch Mode ◽  
Acid Orange ◽  
Adsorption Data

In the present study, the adsorption of acid orange 7 (AO7) dye from aqueous solution by sugarcane bagasse (SB) and cetylpyridinium bromide (CPBr) modified sugarcane bagasse (SBC) was examined. SBC was prepared by reacting SB with different concentrations (0.1, 1.0 and 4.0 mM) of cationic surfactant, CPBr. The SB and SBC were characterized using Fourier transform infrared (FTIR) spectroscopy. The adsorption experiments were carried out in a batch mode. The effect of initial AO7 concentrations (5-1000 mg/L), initial CPBr concentrations and pH of AO7 solution (2-9) on the adsorption capacity of SB and SBC were investigated. The experimental adsorption data were analyzed using Langmuir and Freundlich isotherm models. The adsorption of AO7 onto SB and SBC followed Freundlich and Langmuir isotherm models, respectively. The maximum uptake of AO7 was obtained by SBC4.0 (SB treated with 4.0 mMCPBr) with the adsorption capacity of 144.928 mg/g. The highest AO7 removal was found to be at pH 2 and 7 for SB and SBC, respectively. As a conclusion, sugarcane bagasse modified with CPBr can become an alternative adsorbent for the removal of anionic compounds in aqueous solution.

scholarly journals Application of Chemically Modified Industrial Slag to As(III) Adsorption from Wastewater: Kinetics and Mass Transfer Analysis

2021 ◽  
Vol 68 (2) ◽  
pp. 341-354
Author(s):  
Arijit Dutta Gupta ◽  
Vivek Jaiswal ◽  
Vivek Bhadauria ◽  
Harinder Singh
Keyword(s):  
Mass Transfer ◽  
Freundlich Isotherm ◽  
Maximum Adsorption Capacity ◽  
Transfer Coefficients ◽  
Uptake Capacity ◽  
Brick Kiln ◽  
Batch Mode ◽  
Chemically Modified ◽  
Adsorption Data ◽  
Pseudo Second Order

In the present study, brick kiln slag (BKS) has been utilized for low concentration As(III) adsorption in batch mode. BKS was modified with H2SO4 (SA) and NaOH (SB) for enhancing As(III) uptake capacity. Maximum adsorption capacity (13.7 mg/g) was observed for SA at 298 K, pH = 7.0, adsorbent dose = 0.3 g and time = 70 min which was 1.4 times higher than that of SB. Adsorption data modelled into Freundlich isotherm and pseudo-second-order kinetics. Mass transfer coefficients decreased with increase in As(III) concentration. Film diffusion significantly dominated the adsorption of As(III) ions irrespective of the initial concentration. Dimensionless Sherwood number (Sh) interrelated As(III) concentration (Co) as: Sh = 2.97(Co)–0.376, Sh = 4.12(Co)–0.215, Sh = 4.83(Co)–0.588 for H2SO4 modified, NaOH modified and native slag respectively. Low temperature (298 K) favoured As(III) adsorption (based on ΔG° value). Therefore, the modified slag can be used as an effective adsorbent for As(III) remediation from groundwater.

scholarly journals Adsorption of Ni(II), Cu(II) and Fe(III) from Aqueous Solutions Using Activated Carbon

2008 ◽  
Vol 5 (1) ◽  
pp. 1-9 ◽  
Author(s):  
A. Edwin Vasu
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Metal Ion ◽  
Transition Metal Ions ◽  
Batch Mode ◽  
Liquid Phase Adsorption ◽  
Physical Chemical ◽  
Standard Procedures ◽  
Adsorption Data ◽  
Pseudo Second Order

An activated carbon was tested for its ability to remove transition metal ions from aqueous solutions. Physical, Chemical and liquid-phase adsorption characterizations of the carbon were done following standard procedures. Studies on the removal of Ni(II), Cu(II) and Fe(III) ions were attempted by varying adsorbate dose, pH of the metal ion solution and time in batch mode. The equilibrium adsorption data were fitted with Freundlich, Langmuir and Redlich-Peterson isotherms and the isotherm constants were evaluated. Time variation studies indicate that adsorptions follow pseudo-second order kinetics. pH was found to have a significant role to play in the adsorption. The processes were endothermic and the thermodynamic parameters were evaluated. Desorption studies indicate that ion-exchange mechanism is operating.

scholarly journals FAU—Type Zeolite Synthesis from Clays and Its Use for the Simultaneous Adsorption of Five Divalent Metals from Aqueous Solutions

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3738
Author(s):  
Ifeoma V. Joseph ◽  
Lubomira Tosheva ◽  
Gary Miller ◽  
Aidan M. Doyle
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Process ◽  
Divalent Cations ◽  
Mass Ratio ◽  
Kaolinite Clay ◽  
Synthesis Conditions ◽  
Adsorption Data ◽  
Competing Cations ◽  
Type Zeolite ◽  
Best Fit

In this research, a vermiculite-kaolinite clay (VK) was used to prepare faujasite zeolites via alkaline fusion and hydrothermal crystallisation. The optimal synthesis conditions were 1 h fusion with NaOH at 800 °C, addition of deionised water to the fused sample at a sample to deionised water mass ratio of 1:5, 68 h of non-agitated ageing of the suspension, and 24 h of hydrothermal treatment at 90 °C. The efficacy of the prepared faujasite was compared to raw clay and a reference zeolite material through adsorption experiments of aqueous solutions containing five divalent cations—Cd, Co, Cu, Pb, and Zn. The results showed that in the presence of competing cations at concentrations of 300 mg L−1 and adsorbent loading of 5 g L−1, within the first 10 min, about 99% of Pb, 60% of Cu, 58% of Cd, 28% of Zn, and 19% of Co were removed by the faujasite prepared from clay. Two to four parameter nonlinear adsorption isotherms were used to fit the adsorption data and it was found that overall, three and four parameter isotherms had the best fit for the adsorption process.

Removal of Phosphate from Wastewater Using Carbonized Filter Cake

2018 ◽  
Vol 879 ◽  
pp. 125-130
Author(s):  
Woravith Chansuvarn
Keyword(s):  
Contact Time ◽  
Filter Cake ◽  
Low Cost ◽  
Agricultural Waste ◽  
Fluorescence Analysis ◽  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Wastewater Sample ◽  
Adsorption Parameters ◽  
Phosphate Ion

The aim of this work was to study the potential of the agricultural waste byproduct as a low-cost adsorbent for removal of phosphate ion (PO43-) from synthetic wastewater. The simple preparation of carbonized filter cake (CFC) was performed at 550°C. CFC was also characterized using FTIR, X-ray fluorescence analysis. The adsorptive parameters of batch experiment, such as pH of solution, dosage and contact time were systematically studied in order to the optimization condition. The optimum conditions of pH, contact time and adsorbent dose were to be 6, 60 min, and 2 g/L, respectively. The Langmuir and Freundlich isotherms were used to calculate the adsorption parameters that was able to describe the equilibrium isotherm and adsorptive mechanism. The maximum monolayer adsorption capacity of CFC was estimated as 20.32 mg/g. The optimized condition was applied for phosphate removal from synthetic wastewater. The achieved phosphate removal efficiency from synthetic wastewater sample was to be 92.4%. Filter cake is a low-cost byproduct of sugar cane but it can also highly effective remove phosphate ion from aqueous solution. The modification of filter cake surface via chemical reaction as a new adsorbent in order to increase surface sites and high affinity with phosphate ion will also be further studied.

scholarly journals Adsorption feasibility in the cr(total) ions removal from waste printing developer

2013 ◽  
Vol 14 (1) ◽  
pp. 18-23
Keyword(s):  
Activated Carbon ◽  
Correlation Coefficients ◽  
Freundlich Isotherm ◽  
Experimental Tests ◽  
Batch Mode ◽  
Technical Feasibility ◽  
Good Efficiency ◽  
Adsorption Capacities ◽  
Adsorption Data

In this article, the technical feasibility of various commercial adsorbents (activated carbon, clinoptilolite, and their mixture) for removal of Cr(total) ions from waste printing developer has been represent. Experimental tests were performed in laboratory batch mode. The adsorption data were analyzed using the Freundlich, Langmuir and Dubinin-Kaganer-Radushkevich (DKR) isotherm models. It was found that the Freundlich isotherm gave better results than the Langmiur and DKR models, with the corresponding correlation coefficients (R2): 0.981, 0.996 and 0.997 for mixture (NZ+AC), AC and NZ, respectively. The adsorption capacities of Cr(total) ions followed the order: (NZ+AC)>AC>NZ. The adsorption efficiencies of Cr(total) ions removal were 38.5 to 39.9%. Due to easy availability and good efficiency, the mixture of clinoptilolite and activated carbon is an ideal adsorbents for removal of Cr(total) ions from waste printing developer.

scholarly journals Removal of Phenol ando-Cresol by Adsorption onto Activated Carbon

2008 ◽  
Vol 5 (2) ◽  
pp. 224-232 ◽  
Author(s):  
A. Edwin Vasu
Keyword(s):  
Activated Carbon ◽  
Kinetic Studies ◽  
Batch Mode ◽  
Phenol Solution ◽  
Adsorption Capacities ◽  
Monolayer Adsorption ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Dilute Aqueous Solutions ◽  
Isotherm Equations

A commercial activated carbon was utilized for the adsorptive removal of phenol and o-cresol from dilute aqueous solutions. Batch mode adsorption studies were performed by varying parameters such as concentration of phenol solution, time, pH and temperature. The well known Freundlich, Langmuir and Redlich-Peterson isotherm equations were applied for the equilibrium adsorption data and the various isotherm parameters were evaluated. The Langmuir monolayer adsorption capacities were found to be 0.7877 and 0.5936 mmole/g, respectively, for phenol and o-cresol. Kinetic studies performed indicate that the sorption processes can be better represented by the pseudo-second order kinetics. The processes were found to be endothermic and the thermodynamic parameters were evaluated. Desorption studies performed indicate that the sorbed phenol molecules can be desorbed with dil. HCl.

scholarly journals REMOVAL OF HEAVY METALS FROM REFINERIES WASTEWATER

2021 ◽  
Vol 25 (Special) ◽  
pp. 3-97-3-107
Author(s):  
Zainab J. Shadhan ◽  
◽  
Mohammed N. Abbas ◽  
Keyword(s):  
Activated Carbon ◽  
Equilibrium Concentration ◽  
Adsorption Method ◽  
Batch Mode ◽  
Northern Iraq ◽  
Oil Refineries ◽  
A Value ◽  
Removal Of Heavy Metals ◽  
Acidic Function ◽  
Equilibrium Concentrations

In this study, the adsorption method was investigated for removing vanadium (V+5), nickel (Ni+2) and cadmium (Cd+2) ions from aqueous solutions contaminated with these metals, which simulate the polluting metals of the liquid wastewater of oil refineries in three Iraqi refineries, namely the Kirkuk refinery - Kirkuk governorate in northern Iraq, and the Doura refinery - Baghdad in central Iraq and Al-Shuaiba refinery in Basra Governorate, southern Iraq. Three types of pre-prepared common adsorbents were used, which are activated carbon, alumina, and white eggshells in a batch mode unit. The results obtained from the study showed that 5 was the best acidic function (pH) for removing vanadium and cadmium by using all adsorbent materials, while the acidic function with a value of 6 was the optimum in the case of nickel. Likewise, the equilibrium concentration with the activated carbon only reached 150 ppm for vanadium and cadmium and 100 ppm for elemental nickel. The nickel equilibrium concentration reached 90 and 75 ppm using alumina and white eggshells respectively. The equilibrium concentrations of vanadium were 100 for the rest of the substances. The results obtained also showed that increasing the agitation speed leads to enhancing the removal efficiency within less than 400 rpm and with a best contact time was 150 minute under ambient temperature and with an amount of adsorbent ranged between 0.3 - 0.7 g of different adsorbent.

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