scholarly journals Zeolites in Phenol Removal in the Presence of Cu(II) Ions—Comparison of Sorption Properties after Chitosan Modification

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 643 ◽  
Author(s):  
Lidia Bandura ◽  
Małgorzata Franus ◽  
Jarosław Madej ◽  
Dorota Kołodyńska ◽  
Zbigniew Hubicki
Keyword(s):  
Nitrogen Adsorption ◽  
Isotherm Models ◽  
Phenol Removal ◽  
Experimental Conditions ◽  
Kinetics Of Adsorption ◽  
Initial Concentration ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Adsorption Desorption ◽  
Kinetics Of

Nowadays, the contamination of water with phenol is a serious environmental problem. This compound occurs very often with heavy metal ions which makes purification of water even more difficult. This article presents the problem of the removal of phenol from aqueous solutions in the presence of Cu(II) ions on synthetic zeolite NaP1 and zeolite NaP1 modified with chitosan. The adsorbents were determined with the use of Fourier transform infrared spectroscopy (FT-IR), nitrogen adsorption/desorption isotherm, and scanning electron microscopy (SEM). The studies on isotherms and batch kinetics under diversified experimental conditions with respect to initial concentration, contact time, and pH were discussed. Both Cu(II) and phenol adsorption increases with the initial concentration. Different isotherm models correspond well with the data acquired through experiments. The kinetics of adsorption follows the pseudo-second order rate equation. The studies indicate that the obtained sorbents can be employed for efficient removal of phenol from wastewater in the presence of Cu(II) ions.

Adsorption Characters of Mn2+ onto Palygorskites Modified by 1, 10-Phenanthroline and Triethylamine

2010 ◽  
Vol 178 ◽  
pp. 8-16
Author(s):  
Liang Dong Feng ◽  
Bo Qing Chen ◽  
Ying Ying Shi ◽  
Ying Wei Guo ◽  
Jing Huang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Contact Time ◽  
Ph Value ◽  
Order Model ◽  
Kinetics Of Adsorption ◽  
Initial Concentration ◽  
Adsorption Capacities ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Kinetics Of

1, 10-phenanthroline and triethylamine modified palygorskites were prepared by microwave irradiation, and characterized with FT-IR technique. The effects of contact time, adsorbent dosage, and pH value of the initial solution on the adsorption characters of Mn2+ were investigated. The adsorption of Mn2+ from aqueous solutions using 1, 10-phenanthroline or triethylamine modified palygorskites were investigated. Experiment results indicated that 1,10-phenanthroline and triethylamine molecules have been successfully grafted to palygorskite. The adsorption was rapid during the first 5 minuts and equilibrium were attained within 60 minutes in the initial concentration of Mn2+ of 50 and 100 mg•L-1, and fast adsorption in the first 10 minutes and slowly increased with the contact time due to the adsorption of palygorskite. The 1, 10-phenanthroline modified palygorskites had higher adsorption capacity than triethylamine modified palygorskites. Compared with natural palggorskites, the Mn2+ ions adsorption capacities of palggorskite modified by 1, 10-phenanthroline or triethylamine were significantly improved. There were less difference in the adsorption capacity between different dasages of 1, 10-phenanthroline modified palygorskites, but the adsorption capacity of Mn2+ adsorbed onto triethylamine modified palygorskites decreased with increasing the dosages. A Lagergren pseudo-second order model best described the kinetics of adsorption of Mn2+ onto the modified palygorskites.

scholarly journals Adsorption/desorption performance of Pb2+ and Cd2+ with super adsorption capacity of PASP/CMS hydrogel

2021 ◽  
Author(s):  
Hao Wang ◽  
Baiyun Zhao ◽  
Li Wang
Keyword(s):  
Single Layer ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Polyaspartic Acid ◽  
Adsorption Effect ◽  
Initial Concentration ◽  
Aqueous Solution Polymerization ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Adsorption Desorption

Abstract Super-absorbent polyaspartic acid/carboxymethyl salix psammophila powder (PASP/CMS) hydrogel was prepared by aqueous solution polymerization. PASP/CMS hydrogel was characterized by FT-IR, XRD, SEM and XPS. The results show that PASP/CMS hydrogel is prepared by graft copolymerization of the -COOH of polyaspartic acid (PASP) and the -CH2OH of carboxymethyl salix psammophila powder (CMS). The surface of that hydrogel becomes dense from loose porosity, and Pb2+ and Cd2+ are adsorbed onto the surface of hydrogel. The crystallinity of CMS is destroyed by the addition of PASP. The initial concentration of Pb2+ and Cd2+, pH, adsorption time and adsorption temperature on the adsorption effect were studied through experiments. And results showed that hydrogel has a good removal effect on Pb(II) and Cd(II) ions. Pseudo-second-order kinetic and Langmuir isotherm models are represented in the process, which are spontaneous, exothermic and decrease of randomness, and it's a single layer chemical adsorption. At the same time, the effect of desorption experimental parameters (HNO3 initial concentration, desorption time, and desorption temperature) on the experiment was studied and optimized.

scholarly journals Adsorption of nicotine from aqueous solutions on montmorillonite and acid-modified montmorillonite

2019 ◽  
Vol 51 (1) ◽  
pp. 93-100
Author(s):  
Irena Ilic ◽  
Natasa Jovic-Jovicic ◽  
Predrag Bankovic ◽  
Zorica Mojovic ◽  
Davor Loncarevic ◽  
...  
Keyword(s):  
Isotherm Model ◽  
Kinetics Of Adsorption ◽  
Nicotine Concentration ◽  
Ph Values ◽  
Modified Montmorillonite ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Kinetics Of ◽  
Ft Ir Spectroscopy

Montmorillonite (Mt) and acid modified montmorillonite (MtA) were tested as nicotine adsorbents. The samples were characterized using FT-IR spectroscopy and low temperature nitrogen physisorption. Nicotine adsorption was performed with respect to contact time, pH and initial nicotine concentration. The kinetics of adsorption obeyed the pseudo-second-order kinetics. The optimal pH values for nicotine adsorption were 6 and 9 for Mt and MtA, respectively. The isotherms related to adsorption on Mt at pH = 6 and 9 as well as for MtA at pH=6 were best fitted with Sips isotherm model, while adsorption onto MtA at pH=9 obeyed Langmuir isotherm model.

scholarly journals Statistical analysis on the removal of malachite green dye using active carbons of Achyranthes aspera and Allamanda blanchetii plants

2019 ◽  
Vol 14 (4) ◽  
pp. 808-824
Author(s):  
Sujitha Ravulapalli ◽  
Ravindhranath Kunta
Keyword(s):  
Malachite Green ◽  
Activated Carbons ◽  
Industrial Effluent ◽  
Isotherm Models ◽  
Active Carbons ◽  
Kinetics Of Adsorption ◽  
Achyranthes Aspera ◽  
Malachite Green Dye ◽  
Pseudo Second Order ◽  
Kinetics Of

Abstract Activated carbons were prepared from the stem parts of Achyranthes aspera and Allamanda blanchetii plants and were investigated as adsorbents for the removal of malachite green dye from contaminated water. Various extraction conditions such as pH, initial concentration of dye, adsorbent dosage, temperature, agitation time and presence of co-ions were optimized for the maximum possible extraction of the dye. For analyzing the combined effect of these parameters on the removal efficiency of the adsorbents, statistical optimization modelling was adopted. The adsorbents developed were characterized and the adsorption abilities were observed to be 40.0 mg/g and 53.0 mg/g for the active carbons of Achyranthes aspera and Allamanda blanchetii plants respectively. The mechanism of adsorption was studied using various isotherm models and it was found that the Freundlich model describes well the adsorption process. Thermodynamic studies revealed the endothermic and spontaneous nature of physisorption. The kinetics of adsorption were well defined by the pseudo-second-order model. Desorption and regeneration studies of the spent adsorbents indicated that the percentage of extraction has not come down below 80.0% even after five regenerations for both the adsorbents. The validity of the methods developed are tested with real dye-polluted industrial effluent samples.

Preparation and its Adsorption Characters of Pb2+ Ions-Imprinted Chitosan/Palygorskite Hybrid Materials

2011 ◽  
Vol 391-392 ◽  
pp. 1324-1329
Author(s):  
Ying Ying Shi ◽  
Qiang Hua Zhang ◽  
Liang Dong Feng ◽  
Qing Ping Xiong ◽  
Fei Liu
Keyword(s):  
Ph Value ◽  
Synthesis Process ◽  
Optimum Conditions ◽  
Order Model ◽  
Fast Kinetics ◽  
Kinetics Of Adsorption ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Ion Imprinting ◽  
Kinetics Of

By using Palygorskite as matrix and introducing the surface ion-imprinting concept to the synthesis process, a Palygorskite-supported organic–inorganic hybrid polymer for selective separation of Pb2+ from aqueous solutio was prepared. The prepared polymer was characterized with techniques of SEM, XRD and FT-IR. The effects of contact time, pH value and temperature of the initial solution on the adsorption characters of Pb2+ were investigated. Under the optimum conditions, the ions-imprinted polymer offered a fast kinetics for the adsorption of Pb2+ and the maximum capacity was 4.51 mg/g. And the pseudo-second order model bestly described the kinetics of adsorption of Pb2+ onto the as-prepared materials.

scholarly journals Study of the Interaction of Heavy Metals (Cu(II), Zn(II)) Ions with a Clay Soil of the Region of Naima-Tiaret-Algeria

2020 ◽  
Vol 15 (3) ◽  
pp. 765-785
Author(s):  
Taibi Mohamed ◽  
Elaziouti Abdelkader ◽  
Laouedj Nadjia ◽  
Dellal Abdelkader
Keyword(s):  
Heavy Metals ◽  
Ion Exchange ◽  
Adsorption Process ◽  
Layer Structure ◽  
Retention Mechanism ◽  
Basal Spacing ◽  
Kinetics Of Adsorption ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Kinetics Of

The RM (RM stands for the pristine clay) collected from sites in the Naima-Tiaret-Algeria and its purified phase TM (TM stands for the treated clay) were characterized using XRF, XRD, FT−IR, SEM−EDX, and DC electrical conductivity techniques. The as-prepared clays were used as potential adsorbents for the removal of Cu2+ and Zn2+ metals ions. Highly purified clay TM, exhibiting a basal, spacing of 25.83 Å and CEC of 51 meq/100 g, was obtained. The type of interstratified I/M in the studied sites is S=1, based on the calculation method of Watanabe. The percentage of illite type S=1 is between 80−85% illite. The adsorption equilibrium was established in 60 min with the capacities of 28.57 and 24.39 mg/g for Cu2+ onto RM, 32.25 and 4.95 mg/g for Zn2+ in the presence of TM. D-R isotherm model was more suitable with the adsorption process than Freundlich and Langmuir models suggesting the ion exchange nature of the retention mechanism in most cases (E > 8 kJ/mol). Pseudo second-order model best described the kinetics of adsorption process. The adsorption mechanism was mainly monitored by ion exchange mechanism between exchangeable interlayer cations (Na) in the interstratified I/M and Cu2+ or Zn2+ metals from aqueous matrix. Further, the release of H+ ions from the edge of the layer structure in acidic environments promote the adsorption of heavy metals onto the surfaces interstratified I/M clay soils via electrostatic attraction. Copyright © 2020 BCREC Group. All rights reserved 

scholarly journals Biosorption of Nickel (II) from Aqueous Solutions onto Pistachio Hull Waste as a Low-Cost Biosorbent

2019 ◽  
Vol 5 (2) ◽  
pp. 447 ◽  
Author(s):  
Majid Zamani Beidokhti ◽  
Seyed Taghi (Omid) Naeeni ◽  
Mohammad Sajjad AbdiGhahroudi
Keyword(s):  
Heavy Metals ◽  
Low Cost ◽  
Agricultural Waste ◽  
Process Time ◽  
Kinetics Of Adsorption ◽  
Initial Concentration ◽  
Hull Waste ◽  
Removal Of Heavy Metals ◽  
Pseudo Second Order ◽  
Kinetics Of

There are many different industrial wastewater containing heavy metals that contribute to environmental pollution and raw agricultural waste is an effective adsorbent for the removal of heavy metals. The adsorption behavior of pistachio hull powder (PHP) as a low-cost adsorbent, with respect to nickel (II) ions, has been studied in order to consider its application to the purification of metal finishing wastewater. In this work, adsorption of nickel on pistachio hull has been studied by batch techniques. The adsorption depends on the process time, the pH of the solution, initial concentration of metals and the adsorbent concentration in the suspension. The kinetics of adsorption were relatively fast, reaching equilibrium for less than 60 minutes. Kinetic and isotherm modeling studies demonstrated that the experimental data best fit a pseudo-second order and Freundlich model, respectively. The maximum Langmuir adsorption capacity was 14 mg/g. The optimum pH required for maximum adsorption was found to be 4-6. The initial concentration of the adsorbate and the concentration of pistachio hull strongly affect the process. No influence of particle size was evidenced. A degree of adsorption higher than 75% can be achieved for nickel (II) ions.

scholarly journals Kinetics of adsorption of methylene blue onto activated kolanut pod

2021 ◽  
Vol 12 (2) ◽  
pp. 156-162
Author(s):  
A.S. Muhammad ◽  
M.A. Abdurrahman
Keyword(s):  
Contact Time ◽  
Adsorption Process ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Kinetics Of Adsorption ◽  
Initial Concentration ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Calculated Amount

A batch adsorption process was carried out by optimizing, the effect of contact time (10min to 180min) and initial concentration (5mg/l to150mg/l). The adsorbent was characterized using FTIR spectra and SEM, and the result obtained showed shifting and disappearance of peaks after adsorption. The results of the adsorption kinetics, which includes the correlation coefficient 0.9771 and the agreement between the amount adsorbed experimentally (1.472mg/g) and the calculated amount absorbed(1.196mg/g) revealed that MB was adsorbed satisfactory according to the pseudo second-order kinetic model.

scholarly journals Biosorption of praseodymium (III) using Terminalia arjuna bark powder in batch systems: isotherm and kinetic studies

2017 ◽  
Vol 77 (3) ◽  
pp. 727-738 ◽  
Author(s):  
Krishna Kumari Swain ◽  
Pravat Manjari Mishra ◽  
Aparna Prabha Devi
Keyword(s):  
Kinetic Studies ◽  
Second Order ◽  
Advanced Materials ◽  
Isotherm Models ◽  
Terminalia Arjuna ◽  
Biosorption Process ◽  
Batch Systems ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Kinetics Of

Abstract The high demand for rare earth elements (REEs) used in various advanced materials implies demand for increased production of REEs or the recycling of solutions to recover the REEs they contain. In this study, the biosorption of Pr(III) from aqueous solution by bark powder of Terminalia arjuna was examined in a batch system as a function of metal concentration, biosorbent dosage, pH and contact time. Results showed that T. arjuna bark powder has a high affinity for adsorbing Pr(III): more than 90% at pH 6.63. The adsorption of Pr(III) by T. arjuna bark powder was investigated by the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models. The kinetics of the biosorption process was tested with pseudo-first-order and pseudo-second-order models, and the results showed that the biosorption process was better fitted to the pseudo-second-order model. From Fourier transform infrared spectroscopy (FT-IR) analysis, it is confirmed that the biomolecules of T. arjuna bark powder are involved in the biosorption process of Pr(III) metal ions.

scholarly journals Adsorption of REEs from Aqueous Solution by EDTA-Chitosan Modified with Zeolite Imidazole Framework (ZIF-8)

2021 ◽  
Vol 22 (7) ◽  
pp. 3447
Author(s):  
Sihan Feng ◽  
Xiaoyu Du ◽  
Munkhpurev Bat-Amgalan ◽  
Haixin Zhang ◽  
Naoto Miyamoto ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Growth Method ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Multiple Cycles ◽  
Adsorption Desorption

Chitosan (CS) modified with ethylenediamine tetraacetic acid (EDTA) was further modified with the zeolite imidazole framework (ZIF-8) by in situ growth method and was employed as adsorbent for the removal of rare-earth elements (REEs). The material (EDTA–CS@ZIF-8) and ZIF-8 and CS were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and nitrogen adsorption/desorption experiments (N2- Brunauer–Emmet–Teller (BET)). The effects of adsorbent dosage, temperature, the pH of the aqueous solution, contact time on the adsorption of REEs (La(III), Eu(III), and Yb(III)) by EDTA–CS@ZIF-8 were studied. Typical adsorption isotherms (Langmuir, Freundlich, and Dubinin–Radushkevich (D-R)) were determined for the adsorption process, and the maximal adsorption capacity was estimated as 256.4 mg g−1 for La(III), 270.3 mg g−1 for Eu(III), and 294.1 mg g−1 for Yb(III). The adsorption kinetics results were consistent with the pseudo-second-order equation, indicating that the adsorption process was mainly chemical adsorption. The influence of competing ions on REE adsorption was also investigated. After multiple cycles of adsorption/desorption behavior, EDTA–CS@ZIF-8 still maintained high adsorption capacity for REEs. As a result, EDTA–CS@ZIF-8 possessed good adsorption properties such as stability and reusability, which have potential application in wastewater treatment.

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