scholarly journals Adsorption of Thymol onto Natural Clays of Morocco: Kinetic and Isotherm Studies

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Hamid Ziyat ◽  
Mohammed Naciri Bennani ◽  
Hassan Hajjaj ◽  
Omar Qabaqous ◽  
Said Arhzaf ◽  
...  
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
X Ray Diffraction ◽  
Order Model ◽  
Freundlich Model ◽  
Kinetics Of Adsorption ◽  
Adsorption Capacities ◽  
Pseudo Second Order ◽  
Natural Clays ◽  
Uv Visible ◽  
Kinetics Of

The present work aims to study the affinity of a component of the thyme essential oil “thymol” to natural Moroccan clay “Rhassoul” using the adsorption technique. The physicochemical characterizations of the purified and modified clay were carried out by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), DTA/TGA, and SEM-EDX. Thymol adsorption tests on the purified Rhassoul (Rh-P) and the modified one by CTAB (Rh-CTAB) were followed by UV-visible spectroscopy. They show that the adsorption isotherms can be described by the Freundlich model and that the kinetics of adsorption is in accordance with the pseudo-second-order model for the two clays. Adsorption capacities obtained were of the order of 6 mg/g for the purified Rhassoul and 16 mg/g for the modified Rhassoul by cetyltrimethylammonium bromide (CTAB). These values show that the modified Rhassoul has a better adsorption capacity compared to the purified Rhassoul.

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.

Synthesis, Adsorption Behavior of a Maleamic Acid Cross-Linked β- Cyclodextrin Polymer for Removal of Basic Fuchsin in Aqueous Solution

2014 ◽  
Vol 937 ◽  
pp. 9-16
Author(s):  
Xiao Mei Zhang ◽  
Hong Zhan Li ◽  
Man Li Cao ◽  
Chao Yue Chen
Keyword(s):  
Aqueous Solution ◽  
Adsorption Behavior ◽  
Basic Fuchsin ◽  
Order Model ◽  
Kinetics Of Adsorption ◽  
Langmuir Adsorption ◽  
Adsorption Capacities ◽  
Pseudo Second Order ◽  
Maleamic Acid ◽  
Kinetics Of

A crosslinked β-cyclodextrin (β-CD) polymer (PCD) was synthesized by using maleamic acid as a crosslinked agent, and its adsorption behavior for basic fuchsin in aqueous solution was investigated. The adsorption isotherms could be well fitted by the Langmuir adsorption equation. On the basis of the Langmuir analysis, the maximum adsorption capacities were determined to be 33.56 mg·g-1 at 308K. The kinetics of adsorption followed the pseudo-second-order model.

scholarly journals Enhanced removal of hexavalent chromium by different acid-modified biochar derived from corn straw: behavior and mechanism

2020 ◽  
Vol 81 (10) ◽  
pp. 2270-2280
Author(s):  
Yonggang Xu ◽  
Tianxia Bai ◽  
Yubo Yan ◽  
Yunfeng Zhao ◽  
Ling Yuan ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Hydrogen Ion ◽  
Corn Straw ◽  
Order Model ◽  
Freundlich Model ◽  
X Ray ◽  
Modified Biochar ◽  
Before And After ◽  
Pseudo Second Order ◽  
Kinetics Of

Abstract It is of great significance to remove Cr(VI) from water as a result of its high toxicity. Biochar from corn straw was modified by different acids (HNO3, H2SO4 and H3PO4) to remove Cr(VI) from aqueous solution. To estimate the removal mechanisms of Cr(VI) by the acid-modified biochars, batch experiments were performed in the light of contact time, Cr(VI) concentration, and pH, and the characteristics of acid-modified biochars before and after Cr(VI) adsorption were investigated by Fourier transform infrared spectra (FTIR) and X-ray photoelectron spectroscopy (XPS). The adsorption kinetics of Cr(VI) by acid-modified biochars were consistent with the pseudo-second-order model, and the adsorption isotherm obeyed the Freundlich model. Furthermore, the acid- modified biochars could supply more oxygen-containing functional groups (-COOH and -OH) as electron donor (e−) and hydrogen ion (H+) to enhance the reduction of Cr(VI) to Cr(III), resulting in enhanced removal of Cr(VI). HNO3-modified biochar exhibited the highest removal efficiency of Cr(VI). In general, the acid modifition of biochar was an effective method to increase the removal of Cr(VI).

scholarly journals Ecologically friendly chitosan-montmorillonite bio-nanocomposite as adsorbent for textile dyes from aqueous solutions

2017 ◽  
Vol 49 (4) ◽  
pp. 419-429
Author(s):  
Natasa Jovic-Jovicic ◽  
Predrag Bankovic ◽  
Zorica Mojovic ◽  
Bojana Nedic-Vasiljevic ◽  
Sanja Marinovic ◽  
...  
Keyword(s):  
Textile Dyes ◽  
Langmuir Model ◽  
Reactive Black 5 ◽  
Freundlich Model ◽  
Kinetics Of Adsorption ◽  
Order Of Kinetics ◽  
Pseudo Second Order ◽  
Ir Analysis ◽  
Acid Orange 10 ◽  
Kinetics Of

The bio-nanocomposite of montmorillonite and natural biopolymer chitosan (C-MM) was synthesized. Intercalation of chitosan in form of monolayer into the interlamellar space of montmorillonite was confirmed by XRD and IR analysis. The adsorption of textile dyes: Acid Yellow 99 (AY99), Acid Orange 10 (AO10) and Reactive Black 5 (RB5) onto C-MM was investigated. The adsorption was performed with the respect to adsorption time, pH and initial dye concentration. The kinetics of adsorption obeyed pseudo-second-order of kinetics and was the most efficient in acidic pH. Langmuir model best described the adsorption of AY99 and AO10 , while RB5 adsorption isotherm was best fitted with Freundlich model.

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 Adsorption of reactive blue BF-5G dye on MCM-41 synthesized from Chocolate clay

Cerâmica ◽  
2020 ◽  
Vol 66 (379) ◽  
pp. 269-276
Author(s):  
L. N. R. de Paula ◽  
G. M. de Paula ◽  
M. G. F. Rodrigues
Keyword(s):  
Adsorption Equilibrium ◽  
Acid Leaching ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Order Model ◽  
Freundlich Model ◽  
X Ray ◽  
Silica Source ◽  
Pseudo Second Order ◽  
Mcm 41

Abstract The efficiency of as-synthesized and calcined mesoporous silica, using clay as a silica source, to remove the reactive blue BF-5G dye was investigated. The materials were characterized by X-ray diffraction (XRD) analysis, energy-dispersive X-ray fluorescence (ED-XRF), and Fourier-transform infrared spectroscopy. The kinetic and adsorption isotherms were also studied. The XRD and ED-XRF results showed that the Chocolate clay is rich in SiO2 (69.4%) and has a large amount of other oxides, which can be eliminated by acid leaching. According to the characterization results, the MCM-41 synthesis was effective and produced a highly-ordered material. The kinetic study showed the adsorption corresponded predominantly to the pseudo-second order model. Adsorption equilibrium was reached after 3 h, and the data were better fitted to the Freundlich model. Furthermore, both samples obtained satisfactory removal results, being potential adsorbents having reduced cost due to the use of an alternative silica source.

Removal of Pb (II) by CS2 Modified Kenaf Powder

2014 ◽  
Vol 970 ◽  
pp. 7-11 ◽  
Author(s):  
Siti Raihan Zakaria ◽  
Megat Ahmad Kamal Megat Hanafiah ◽  
Siti Norhafiza Mohd Khazaai ◽  
Zurhana Mat Hussin ◽  
Wan Khaima Azira Wan Mat Khalir ◽  
...  
Keyword(s):  
Industrial Applications ◽  
Langmuir Model ◽  
Hibiscus Cannabinus ◽  
Order Model ◽  
Freundlich Model ◽  
Isotherm Study ◽  
Adsorption Capacities ◽  
Good Potential ◽  
Pseudo Second Order ◽  
Adsorbent Characterization

Kenaf (Hibiscus cannabinus) is a hardy crop that has wide industrial applications such as insulator, paper, carpet padding, bedding and a good adsorbent for oil. This study investigated the ability of carbon disulfide (CS2) modified kenaf (CMK) to remove toxic Pb (II) from waste water. Adsorbent characterization was carried out by Field Emission Scanning Electron Microscope and Energy Dispersive X-ray Spectroscope (FESEM-EDX) analysis. The adsorption kinetic data was well described by pseudo-second-order model and the adsorption isotherm study indicated that Langmuir model fitted well with the experimental data than the Freundlich model. Based on the Langmuir model, the maximum adsorption capacities of Pb (II) (qmax) was 63.3 mg g-1 .This study suggested that CMK has a good potential to be used as an adsorbent material for Pb (II) removal from aqueous solutions.

scholarly journals A comparative study on Fe(III)-chitosan and Fe(III)-chitosan-CTAB composites for As(V) removal from water: preparation, characterization and reaction mechanism

2022 ◽  
Author(s):  
Changjin Jiang ◽  
Ting Zhang ◽  
Shuhui Li ◽  
Zhaoguang Yang
Keyword(s):  
Order Model ◽  
Freundlich Model ◽  
Structure And Property ◽  
Adsorption Capacities ◽  
Wide Range ◽  
Naoh Solution ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Initial Adsorption ◽  
Adsorption Desorption

Abstract Fe(III)-chitosan and Fe(III)-chitosan-CTAB composites were prepared using an ionotropic gelation method. Various techniques were used to analyze the morphology, structure, and property of the adsorbents, including SEM, EDS, FT-IR, XPS, and zeta potential. Compared with Fe(III)-chitosan, Fe(III)-chitosan-CTAB was more effective for As(V) adsorption at a wide range of pH (3–8). The adsorption of As(V) onto Fe(III)-chitosan and Fe(III)-chitosan-CTAB could reach equilibrium in 20 min, and their maximum adsorption capacities were 33.85 and 31.69 mg g‒1, respectively. The adsorption kinetics was best described by the pseudo-second-order model (R2=0.998 and 0.992), whereas the adsorption isotherms was fitted well by the Freundlich model (R2=0.963 and 0.987). The presence of H2PO4− significantly inhibited the adsorption of As(V) onto Fe(III)-chitosan and Fe(III)-chitosan-CTAB, and humic acid also led to a slight decrease in As(V) adsorption by Fe(III)-chitosan-CTAB. Over 94% of As(V) at the initial concentration of no more than 5 mg L−1 was removed from real water by the two adsorbents. 1% (w/v) NaOH solution was determined to be the most suitable desorption agent. Fe(III)-chitosan and Fe(III)-chitosan-CTAB still maintained their initial adsorption capacities after five adsorption-desorption cycles. Based on different characterization results, both electrostatic attraction and surface complexation mechanisms played important roles in As(V) adsorption on Fe(III)-chitosan and Fe(III)-chitosan-CTAB.

scholarly journals Microstructural characterization and adsorption properties of alkali-activated materials based on metakaolin

2016 ◽  
Vol 48 (2) ◽  
pp. 209-220 ◽  
Author(s):  
Katarina Trivunac ◽  
Ljiljana Kljajevic ◽  
Snezana Nenadovic ◽  
Jelena Gulicovski ◽  
Miljana Mirkovic ◽  
...  
Keyword(s):  
Microstructural Characterization ◽  
Adsorption Properties ◽  
X Ray Diffraction ◽  
Kinetics Of Adsorption ◽  
Freundlich Adsorption Isotherm ◽  
Pseudo Second Order ◽  
Removal Efficiencies ◽  
The Difference ◽  
Kinetics Of ◽  
Alkali Activated

The microstructural characterization and adsorption properties of metakaolin (MK) and alkali-activated metakaolin, known as geopolymer materials (GP) were investigated. The structure and properties of the metakaolin and obtained geopolymer were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. Furthermore, based on the analysis of adsorption efficiency, microstructure and mineral structure, the difference between geopolymer and metakaolin on the performance of immobilizing heavy metals have been discussed. The kinetics of adsorption can be represented by pseudo-second order equation. The results of lead ions adsorption experiments were best fitted by Freundlich adsorption isotherm for both investigated adsorbents. The highest removal efficiencies of alkali-activated material based on metakaolin was found 97.5% at pH 4 and metakaolin removal efficiencies was found 92% at pH 5.5.

scholarly journals COMPARISION OF PURE MEMBRANES OF 13X AND 5A ZEOLITE FOR REMOVAL OF ACRIDINE ORANGE DYE FROM AQUEOUS SOLUTIONS

2018 ◽  
Vol 15 (29) ◽  
pp. 251-256
Author(s):  
D. C. COELLO-FIALLOS ◽  
S. M. ESPIN-LAGOS ◽  
C. VACACELA GOMEZ ◽  
A. TAVOLARO ◽  
L. S. CAPUTI
Keyword(s):  
Aqueous Solutions ◽  
Acridine Orange ◽  
Easy Method ◽  
Kinetics Of Adsorption ◽  
5A Zeolite ◽  
Pseudo Second Order ◽  
High Reduction ◽  
Uv Visible ◽  
Kinetics Of ◽  
Good Agreement

This work has been performed to test pure membranes of two zeolites as effective adsorbents for the removal of the cationic dye acridine orange (AO) from aqueous solution. The membranes were made through fast and easy method without additional reagents. Membrane made by 5A and 13X zeolites were called m-5A and m-13X, respectively. Adsorption of AO was studied in a batch system in conjunction with UV-visible analyses to determine de efficiency of m-13X and m-5A. Both membranes exhibited good adsorption performance. The influence of contact time on the amount of dye adsorbed onto membranes was investigated, showing high reduction in the first hours of contact. The adsorption efficiency after 18h was 85 % for m-13X, and 55% for m-5A. The kinetics of adsorption showed good agreement with the pseudo-second order model, giving an adsorbed amount of 1,73 and 2,36 mg/g for m-5A and m-13X, respectively. This study shows that m13X is a more effective adsorbent than m-5A for removal of AO from aqueous solutions.

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