Kinetic studies of cobalt ion removal from aqueous solutions using fly ash-based geopolymer and zeolite NaX as sorbents

2016 ◽  
Vol 51 (18) ◽  
pp. 2868-2875 ◽  
Author(s):  
Mario Nikola Mužek ◽  
Sandra Svilović ◽  
Jelica Zelić
Keyword(s):  
Fly Ash ◽  
Aqueous Solutions ◽  
Kinetic Studies ◽  
Cobalt Ion ◽  
Zeolite Nax ◽  
Ion Removal

The kinetic studies of the cobalt ion removal from aqueous solutions by dolomite-based sorbent

2016 ◽  
Vol 13 (11) ◽  
pp. 2561-2568 ◽  
Author(s):  
A. I. Ivanets ◽  
I. L. Shashkova ◽  
N. V. Kitikova ◽  
Y. Morozov
Keyword(s):  
Aqueous Solutions ◽  
Kinetic Studies ◽  
Cobalt Ion ◽  
Ion Removal

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.

scholarly journals Use of fly ash and fly ash agglomerates for As(III) adsorption from aqueous solution

2014 ◽  
Vol 16 (1) ◽  
pp. 21-27 ◽  
Author(s):  
Justyna Ulatowska ◽  
Izabela Polowczyk ◽  
Wojciech Sawiński ◽  
Anna Bastrzyk ◽  
Tomasz Koźlecki ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Aqueous Solutions ◽  
Thermodynamic Parameters ◽  
Kinetic Studies ◽  
Second Order ◽  
Isotherm Models ◽  
Pseudo Second Order ◽  
Chemisorption Model

Abstract The objective of the present study is to assess the efficiency of fly ash and fly ash agglomerates to remove arsenic(III) from aqueous solution. The maximum static uptakes were achieved to be 13.5 and 5.7 mgAs(III)/adsorbent for nonagglomerated material and agglomerated one, respectively. Isotherm studies showed good fit with the Langmuir (fly ash) and the Freundlich (fly ash agglomerates) isotherm models. Kinetic studies indicated that the sorption of arsenic on fly ash and its agglomerates follows the pseudo-second-order (PSO) chemisorption model (R2 = 0.999). Thermodynamic parameters revealed an endothermic nature of As(III) adsorption on such adsorbents. The adsorption results confirmed that fly ash and its agglomerates can be used for As(III) removal from aqueous solutions. Fly ash can adsorb more arsenic(III) than agglomerates, which are easier to use, because this material is less dusty and easier to separate from solution.

Cobalt Ion Removal from Aqueous Solutions by Coal Fly Ash

2013 ◽  
Vol 864-867 ◽  
pp. 1732-1740
Author(s):  
Xiao Xu ◽  
Qiang Yang ◽  
Chao Yang Wang
Keyword(s):  
Fly Ash ◽  
Aqueous Solutions ◽  
Removal Rate ◽  
Coal Fly Ash ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Cobalt Ions ◽  
Freundlich Isotherms ◽  
Ion Removal ◽  
Low Concentrations

Cobalt ions, which are commonly found in low concentrations in industrial wastewater, are toxic, biocumulative, and hard to degrade. Therefore, the removal of these heavy metal ions from wastewater is highly important. The removal of Co (II) from aqueous solutions using untreated and alkali-modified coal fly ash was studied. The results for untreated fly ash show that the pseudo-second-order kinetic equation better fits the observed adsorption progress. The Langmuir and Freundlich isotherms could describe the reaction efficiently, and the maximum adsorption capacity for Co (II) was 237 mg·g-1at 20°C. Pretreating the fly ash with an alkali solution decreases the adsorption capability, possibly by destroying the zeolite structure. When the ratio of the fly ash dose and Co (II) concentration is between 40 and 60, the removal rate of Co (II) at a concentration of 20 mg·L-1reaches 99.95%.

scholarly journals ADSORPTION OF MERCURIC ION FROM AQUEOUS SOLUTIONS USING MODIFIED FLY ASH

2018 ◽  
Vol 56 (6) ◽  
pp. 688 ◽  
Author(s):  
Nguyen Thuy Chinh ◽  
Hoang Thai ◽  
Trang Do Mai Tran ◽  
Tuyet Thi Nguyen ◽  
Oanh Nhat Nguyen ◽  
...  
Keyword(s):  
Fly Ash ◽  
Aqueous Solutions ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Ion Adsorption ◽  
Ion Removal ◽  
Mercuric Ion ◽  
Adsorption Data ◽  
Naoh Solution ◽  
Modified Fly Ash

In this study, fly ash was treated with NaOH solution (FAN) before modifying with (3-mercaptopropyl) triethoxysilane - MPTMS (FAMPS). By using FTIR, FESEM, XRD, EDX, and BET techniques, the change in structure, composition and morphology of FAN and FAMPS was evaluated. The FTIR spectra of FAN and FAMPS showed that there is no chemical reaction between the MPTMS and FAN. After modification, the FAMPS has a rough surface with composition difference from the FAN. Mercuric ion adsorption behavior as well as adsorptionisotherm models (Langmuir and Freundlich) of the FAN and FAMPS were also investigated and discussed. Thanks to FAN modification, the mercuric ion removal percent of the FAMPS was higher than that of the FAN. Owing to the adsorption data, Freundlich isotherm modelwas fitted for the mercuric ion adsorption process.

scholarly journals Hydrothermal Synthesis of Sodalite-Type N-A-S-H from Fly Ash to Remove Ammonium and Phosphorus from Water

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2741
Author(s):  
Pengcheng Lv ◽  
Ruihong Meng ◽  
Zhongyang Mao ◽  
Min Deng
Keyword(s):  
Fly Ash ◽  
Adsorption Capacity ◽  
Removal Rate ◽  
Kinetic Studies ◽  
Solute Concentration ◽  
Raw Material ◽  
Sodium Aluminosilicate ◽  
Equilibrium Data ◽  
One Step ◽  
Ft Ir

In this study, the hydrated sodium aluminosilicate material was synthesized by one-step hydrothermal alkaline desilication using fly ash (FA) as raw material. The synthesized materials were characterized by XRD, XRF, FT-IR and SEM. The characterization results showed that the alkali-soluble desilication successfully had synthesized the sodium aluminosilicate crystalline (N-A-S-H) phase of sodalite-type (SOD), and the modified material had good ionic affinity and adsorption capacity. In order to figure out the suitability of SOD as an adsorbent for the removal of ammonium and phosphorus from wastewater, the effects of material dosing, contact time, ambient pH and initial solute concentration on the simultaneous removal of ammonium and phosphorus are investigated by intermittent adsorption tests. Under the optimal adsorption conditions, the removal rate of ammonium was 73.3%, the removal rate of phosphate was 85.8% and the unit adsorption capacity reached 9.15 mg/L and 2.14 mg/L, respectively. Adsorption kinetic studies showed that the adsorption of ammonium and phosphorus by SOD was consistent with a quasi-secondary kinetic model. The adsorption isotherm analysis showed that the equilibrium data were in good agreement with the Langmuir and Freundlich model. According to thermodynamic calculations, the adsorption of ammonium and phosphorus was found to be a heat-absorbing and spontaneous process. Therefore, the preparation of SOD by modified FA has good adsorption properties as adsorbent and has excellent potential for application in the removal of contaminants from wastewater.

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