scholarly journals Comparison of adsorption of Cd(II) and Pb(II) ions on pure and chemically modified fly ashes

2016 ◽  
Vol 37 (2) ◽  
pp. 215-234 ◽  
Author(s):  
Eleonora Sočo ◽  
Jan Kalembkiewicz
Keyword(s):  
Fly Ash ◽  
Water Solution ◽  
Coal Fly Ash ◽  
Mixing Time ◽  
Sorption Process ◽  
Particle Model ◽  
X Ray Scattering ◽  
Equilibrium And Kinetics ◽  
Pseudo Second Order ◽  
Polluted Waters

Abstract The study investigates chemical modifications of coal fly ash (FA) treated with HCl or NH4HCO3 or NaOH or Na2edta, based on the research conducted to examine the behaviour of Cd(II) and Pb(II) ions adsorbed from water solution on treated fly ash. In laboratory tests, the equilibrium and kinetics were examined applying various temperatures (293 - 333 K) and pH (2 - 11) values. The maximum Cd(II) and Pb(II) ions adsorption capacity obtained at 293 K, pH 9 and mixing time 2 h from the Langmuir model can be grouped in the following order: FA-NaOH > FA-NH4HCO3 > FA > FA-Na2edta > FA-HCl. The morphology of fly ash grains was examined via small-angle X-ray scattering (SAXS) and images of scanning electron microscope (SEM). The adsorption kinetics data were well fitted by a pseudo-second-order rate model but showed a very poor fit for the pseudofirst order model. The intra-particle model also revealed that there are two separate stages in the sorption process, i.e. the external diffusion and the inter-particle diffusion. Thermodynamics parameters such as free energy, enthalpy and entropy were also determined. A laboratory test demonstrated that the modified coal fly ash worked well for the Cd(II) and Pb(II) ion uptake from polluted waters.

Adsorption of Copper(II) on Dithizone-Immobilized Coal Fly Ash

2020 ◽  
Vol 840 ◽  
pp. 48-56
Author(s):  
Violla Bestari Ayu Sabrina Putri ◽  
Dwi Siswanta ◽  
Mudasir Mudasir
Keyword(s):  
Fly Ash ◽  
Contact Time ◽  
Copper Ions ◽  
Coal Fly Ash ◽  
Organic Ligand ◽  
Optimum Conditions ◽  
Batch Mode ◽  
Copper Adsorption ◽  
Pseudo Second Order ◽  
Ft Ir

The adsorption of Cu (II) ions onto selective adsorbent of coal fly ash from Sugar Factory Madukismo, Yogyakarta, Indonesia modified with dithizone has been investigated in batch mode. Some parameters influencing immobilization of dithizone and adsorption of Cu (II) were optimized including an effect of pH, contact time and initial concentration of Cu (II) ions. The FT-IR and XRD analytical results show that the surface of coal fly ash can be modified by immobilization of selective organic ligand towards Cu (II) ions. The optimum conditions for adsorption of Cu (II) are achieved at pH 5, the optimum mass of DICFA and ACFA for copper adsorption were 0.2 g. Kinetics adsorption for copper ions follows pseudo-second-order kinetics with optimum adsorption contact time 60 min for DICFA and ACFA. Isotherms adsorption for Cu ion follow the Langmuir isotherms with chemisorption process and optimum concentration of Cu ion adsorption of 70 mg.L-1 for DICFA and ACFA.

Adsorption of Pb(II) from Aqueous Solutions on Dithizone-Immobilized Coal Fly Ash

2020 ◽  
Vol 840 ◽  
pp. 57-63
Author(s):  
Dina Fitriana ◽  
Mudasir Mudasir ◽  
Dwi Siswanta
Keyword(s):  
Fly Ash ◽  
Adsorption Isotherm ◽  
Contact Time ◽  
Coal Fly Ash ◽  
Order Kinetic ◽  
Adsorbent Dosage ◽  
Activated Coal ◽  
Concentration Of Ions ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Adsorption of Pb(II) ions onto selective adsorbent of dithizone-immobilized coal fly ash (DCFA) from Holcim, Cilacap, Indonesia has been investigated in batch experiments. Prepared coal fly ash (CFA) modified by immobilization of dithizone previously were characterized by FT-IR and XRD. Several parameters influencing the adsorption of Pb(II) ions such as effect of pH, adsorbent dosage, contact time and initial concentration of ions on the efficiency of the adsorption were studied. The optimum condition of Pb(II) adsorption was found at pH 5, adsorbent dosage 0.1 g, contact time 60 min and initial Pb(II) ions concentration of 60 mg L–1. The adsorption kinetics of Pb(II) ions on DCFA was found to follow a pseudo-second-order kinetic model. The adsorption isotherm data were fitted to the Langmuir model. Kinetics and adsorption isotherm studies suggest that the capacity and affinity of the DCFA in adsorbing Pb(II) ions is significantly improved compared to those of non-immobilized activated coal fly ash (ACFA).

scholarly journals Enhanced sorption capacity of the metal-dye system from water effluents by using polish activated industrial waste

2020 ◽  
Author(s):  
Eleonora Sočo ◽  
Jan Kalembkiewicz
Keyword(s):  
Coal Fly Ash ◽  
Sorption Process ◽  
Sorption Kinetics ◽  
Coefficient Of Determination ◽  
Isotherm Models ◽  
Particle Model ◽  
Particle Diffusion ◽  
Hexadecyltrimethylammonium Bromide ◽  
Chi Square ◽  
Chi Square Test

Abstract The activated coal fly ash (FA) treated with NaOH and hexadecyltrimethylammonium bromide (HDTMABr) was used as adsorbent for removal of cadmium(II) ions and rhodamine B (RB) form an aqueous solution. Characterization of FA and FA-HDTMABr were done by using Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The sorption equilibrium in the system were analysed by isotherm models, such as Freundlich, Langmuir, generalized Langmiur-Freundlich, Redlich-Peterson, Jovanović, extended Jovanović, Tóth, Fumkin-Fowler-Guggenheim, Fowler-Guggenheim-Jovanović-Freundlich, Temkin, Dubinin-Radushkevich, Halsey, Brunauer Emmett and Teller. The evaluation of fitting of the isotherms studied experimentally points was carried out by means of the reduced chi-square test and the coefficient of determination. The maximum monolayer adsorption capacity of the FA-HDTMABr was found to be 744 mg·g−1 and 666 mg·g−1 for Cd(II) and RB, respectively. The PFO, PSO, Elovich mass transfer, liquid film diffusion and intra-particle diffusion models were analysed. Sorption kinetics data were well fitted by PSO model. The Elovich and intra-particle model also revealed that there are two separate stages in the sorption process, namely, the external diffusion and the inter-particle diffusion.

Removal of Heavy Metal from Wastewater Using Zeolite from Fly Ash

2012 ◽  
Vol 518-523 ◽  
pp. 2736-2739 ◽  
Author(s):  
Chang Nian Wu ◽  
Yu Chao Tang ◽  
Li Hua Tang
Keyword(s):  
Heavy Metal ◽  
Fly Ash ◽  
Heavy Metal Ions ◽  
Coal Fly Ash ◽  
Freundlich Isotherm ◽  
Zeolite Synthesis ◽  
Pseudo Second Order ◽  
Xrd Patterns ◽  
Isotherm Equations ◽  
Modified Forms

Coal fly ash (CFA) was modified by hydrothermal treatment using NaOH solutions for zeolite synthesis. The XRD patterns of zeolite and coal fly ash are presented. The synthesized zeolite was investigated for adsorption of heavy metal ions in aqueous solution. It was shown that fly ash and the modified forms could effectively absorb heavy metals. The adsorption isotherm could be described by Freundlich isotherm equations. The pseudo second-order kinetics would be better for fitting the dynamic adsorption of Cu2+ and Cd2+.

Study on Modified Zeolite Synthesized from Coal Fly Ash in Adsorption and Desorption of Ammonia Nitrogen

2012 ◽  
Vol 573-574 ◽  
pp. 99-109
Author(s):  
Qi Jin Luo ◽  
Jian Yu Chen ◽  
Man Zhu ◽  
Zhi Hua Pang ◽  
Jun Luo ◽  
...  
Keyword(s):  
Fly Ash ◽  
Adsorption Equilibrium ◽  
Coal Fly Ash ◽  
Ammonia Nitrogen ◽  
Desorption Rate ◽  
Adsorption Dynamics ◽  
Adsorption And Desorption ◽  
Pseudo Second Order ◽  
Type Zeolite ◽  
P Type

The “Twelfth Five-Year” plan of China starts at the emission reduction task in controlling the total amount of ammonia nitrogen. Therefore, the method of how to remove ammonia nitrogen quickly and effectively will be the key point of wastewater treatment. In the current paper, One zeolite synthesized from coal fly ash (P-type zeolite, ZP) was prepared and then modified using lanthanum. The structure of the zeolite was characterized by means of SEM, X-ray, TG-DSC, and the like. The characteristics of ZP and lanthanum-modified ZP (LaZP) in the adsorption and desorption of ammonia nitrogen were simultaneously studied, wherein the results show that ZP and LaZP are featured with obvious crystal characteristics, lots of gap structures, and a strong characteristic peak of P-type zeolite shown in the XRD atlas. For the LaZP, the adsorption equilibrium can be carried out in 30 min. The data for the adsorption dynamics to the ammonia nitrogen are in line with the pseudo-second order kinetics equation, and the adsorption isotherme is well fitted to the Langmuir model. The regeneration test shows that the desorption rate of ammonia nitrogen is proportional to the concentration of NaCl when the pH is about 7. The desorption rate of LaZP to the ammonia nitrogen can reach 90% when the concentration of NaCl is 0.4 mol/l, and the desorption rate of ZP is 70%. Compared with ZP, the desorption speed of the LaZP is quicker, the adsorption equilibrium can be carried out in 6 h, and the adsorption equilibrium of ZP can be slowly carried out in 10 h. Moreover, the adsorption and desorption properties of the LaZP are greatly improved.

scholarly journals Kinetics and Thermodynamic Studies of Cu(II) Ion Adsorption Onto Synthetic Zeolite Synthesized from Coal Fly Ash: Effect of the Co-Ions to the Total Adsorption

2019 ◽  
Vol 35 (2) ◽  
pp. 700-704
Author(s):  
Ahmad Zakaria ◽  
Witri Djasmasari ◽  
Henny Rochaeni ◽  
Yustinus Purwamargapratala ◽  
Supriyono Supriyono
Keyword(s):  
Fly Ash ◽  
Adsorption Process ◽  
Coal Fly Ash ◽  
Synthetic Zeolite ◽  
Kinetics Model ◽  
Ion Adsorption ◽  
Thermodynamic Studies ◽  
Pseudo Second Order ◽  
Total Adsorption ◽  
Kinetics And Thermodynamic

Study of kinetics and thermodynamic of Cu(II) ion adsorption onto synthetic zeolite made of coal fly ash have been investigated. The aim of this research was to define the kinetics model and thermodynamic parameters such as Gibbs free energy (DG°), entropy (DS°), and enthalpy (DH°) of adsorption process of Cu(II) ion by synthetic zeolite made of coal fly ash. The effect of the presence of coexisting ion to the efficiency of Cu(II)adsorption had also been investigated. The experimental conditions were 5, 15, 30, 45, 60, 75, 90 minutes for the contact times and 27, 32, 37, 42°C for the temperature. The kinetics data were evaluated using a first-order and a pseudo second-order Lagergren equation. The results revealed that the kinetics data had good correlation with the pseudo second-order kinetics model. Thermodynamic studies indicated that the adsorption process was spontaneous with the increase in entropy and decrease in Gibbs energy. The coexisting Pb(II) or Mn(II) ions decreased the Cu(II) ion adsorption onto synthetic zeolite, but increased the total adsorption capacities.

Simultaneous sorption of As, B, Cr, Mo and Se from coal fly ash leachates by Al3+-pillared bentonite clay: implication for the construction of activated geo-synthetic clay liner

2017 ◽  
Vol 12 (1) ◽  
pp. 186-201 ◽  
Author(s):  
Vhahangwele Masindi ◽  
W. Mugera Gitari ◽  
Hlanganani Tutu
Keyword(s):  
Fly Ash ◽  
Adsorption Isotherm ◽  
Coal Fly Ash ◽  
Bentonite Clay ◽  
Order Kinetic ◽  
Modified Bentonite ◽  
Adsorption Affinity ◽  
Freundlich Adsorption Isotherm ◽  
Order Kinetic Model ◽  
Pseudo Second Order

The present study reports the optimum conditions for intercalating the Al3+ species to bentonite clay matrices and evaluate the potential of using Al3+-modified bentonite clay (Alum-Bent) for removal of oxyanionic species of As, B, Cr, Mo and Se from coal fly ash (FA) leachates. Removal of oxyanionic species was done in batch experimental procedures. Parameters optimized were: contact time, adsorbent dosage, concentration and pH. The adsorption affinity of Al3+-bentonite clay for oxyanionic species varied as follows: B ≈ Se > Mo > Cr ≈ As respectively. The adsorption data fitted better to Langmuir adsorption isotherm than Freundlich adsorption isotherm hence confirming mono-site adsorption. The adsorption kinetics fitted well pseudo-second-order kinetic model hence confirming chemisorption. The fact that most of the oxyanion were adsorbed at pH ≥ pHpzc indicated that both electrostatic and chemical interactions occurred with the clay surface and interlayers. The Al3+-modified bentonite clay successfully removed oxyanion species from generated coal FA leachates. This study shows that Al3+-modified bentonite clay is an effective adsorbent for oxyanion species in coal FA leachates and could be applied as a reactive barrier in coal FA retention ponds.

scholarly journals ADSORPTION OF REACTIVE BLACK 5 FROM AQUEOUS SOLUTION BY ZEOLITE FROM COAL FLY ASH: EQUILIBRIUM AND KINETIC STUDIES

2011 ◽  
Vol 08 (16) ◽  
pp. 17-24
Author(s):  
Patricia CUNICO ◽  
Denise Alves FUNGARO ◽  
Carina Pitwak MAGDALENA
Keyword(s):  
Fly Ash ◽  
Aqueous Solutions ◽  
Coal Fly Ash ◽  
Kinetic Studies ◽  
Reactive Black 5 ◽  
Order Kinetic ◽  
Zeolitic Material ◽  
Isotherm Adsorption ◽  
Coal Fly Ashes ◽  
Pseudo Second Order

Zeolite synthesized from coal fly ash (ZC) and coal fly ashes (CC) were used as adsorbents to remove Reactive Black 5 (RP5) dye from aqueous solutions. The equilibrium time was reached after 420 min. The kinetics studies indicated that the adsorption followed the pseudo-second order kinetic and that surface adsorption and intraparticle diffusion were involved in the adsorption mechanism. The isotherm adsorption data fit accordingly to the Langmuir model for both adsorbents. The maximum adsorption capacities were 0.685 mg g-1 for RP5/ZC system and 0.577 mg g-1 for RP5/CC system. The efficiencies of adsorption were found to be between 47.7-88.1% for ZC and 65.4-99.6% for CC. The results indicate that zeolitic material is suitable as adsorbent for adsorption of reactive azodye from aqueous solutions.

Removal of Methylene Blue from Wastewater Using Zeolite from Fly Ash

2012 ◽  
Vol 610-613 ◽  
pp. 1286-1289
Author(s):  
Chang Nian Wu ◽  
Qi Ling ◽  
Li Wang ◽  
Wei Hua Li ◽  
Yu Chao Tang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Fly Ash ◽  
Coal Fly Ash ◽  
Freundlich Isotherm ◽  
Dynamic Adsorption ◽  
Zeolite Synthesis ◽  
Pseudo Second Order ◽  
Xrd Patterns ◽  
Isotherm Equations ◽  
Modified Forms

Coal fly ash (CFA) was modified by hydrothermal treatment using NaOH solutions for zeolite synthesis. The XRD patterns of zeolite and coal fly ash are presented. The synthesized zeolite was investigated for adsorption of methylene blue（MB）in aqueous solution. It was shown that fly ash and the modified forms could effectively absorb MB. The adsorption isotherm could be described by Freundlich isotherm equations. The pseudo second-order kinetics would be better for fitting the dynamic adsorption of MB.

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