Preparation and characterization of CTAB-HACC bentonite and its ability to adsorb phenol from aqueous solution

2011 ◽  
Vol 64 (1) ◽  
pp. 286-292 ◽  
Author(s):  
Ruihua Huang ◽  
Dongsheng Zheng ◽  
Bingchao Yang ◽  
Bo Wang ◽  
Zengqiang Zhang
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Trimethyl Ammonium Chloride ◽  
Adsorption Efficiency ◽  
X Ray Diffraction ◽  
Phenol Solution ◽  
X Ray ◽  
Initial Ph ◽  
Lower Temperature

A novel type of adsorbent was prepared by modifying bentonite with N-2-hydroxypropyl trimethyl ammonium chloride chitosan (HACC) with cetyl trimethylammonium bromide (CTAB). The adsorbent was named CTAB-HACC bentonite. Its characteristics were investigated using thermogravimetric, Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction. The adsorption of phenol onto CTAB-HACC bentonite was evaluated by changing various parameters, such as contact time, adsorbent dosage, initial pH of the solution, and temperature. The maximum adsorption was observed at pH 12. Adsorption of phenol on CTAB-HACC bentonite favored at lower temperature and established the equilibrium in 30 min. The adsorption efficiency reached 82.1%, and the adsorption capacity was 7.12 mg/g from the phenol solution with a concentration of 500 mg/L at pH 12.0 and 20 °C.

Preparation and characterization of a new sawdust/MNP/PEI nanocomposite and its applications for removing Pb (II) ions from aqueous solution

2018 ◽  
Vol 78 (12) ◽  
pp. 2469-2480
Author(s):  
Avat Ghasemi ◽  
Mahmoud Reza Sohrabi ◽  
Fereshteh Motiee
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Adsorption Process ◽  
Aqueous Media ◽  
X Ray Diffraction ◽  
Phase Contact Time ◽  
X Ray ◽  
Langmuir Adsorption ◽  
Ft Ir

Abstract A new sawdust/magnetite nanoparticles/polyethyleneimine (SD/MNP/PEI) nanocomposite was synthesized by grafting polyethyleneimine (PEI) to magnetic sawdust. Features of SD/MNP/PEI were characterized using Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and scanning electron microscopy (SEM). SD/MNP/PEI was used as an adsorbent for the removal of lead (Pb (II)) from aqueous solution. The effects of independent variables including pH of solution, adsorbent dose and contact time were performed and adsorption isotherms were obtained. Experimental results show that priority effective variables were pH and the amount of nanocomposite, and it was found that the sorption capacity increases with the increasing phase contact time. The adsorption process followed the Langmuir adsorption isotherm. Although SD and SD/MNP do not show a high affinity for the adsorption of Pb (II) in aqueous media, polyethyleneimine cross-linked on SD/MNP showed 40 and 66% increases, respectively, in the adsorption of Pb (II) compared to the SD and SD/MNP. It was found that SD/MNP/PEI removes more efficiently lead ions from aqueous solutions than the SD, SD/MNP. Desorption of the lead from the SD/MNP/PEI was conducted. It was proved that SD/MNP/PEI has excellent properties and can be used as a sorbent of multi-use.

Structural and IR-spectroscopic characterization of magnesium acesulfamate

2016 ◽  
Vol 71 (1) ◽  
pp. 51-55 ◽  
Author(s):  
Oscar E. Piro ◽  
Gustavo A. Echeverría ◽  
Beatriz S. Parajón-Costa ◽  
Enrique J. Baran
Keyword(s):  
Crystal Structure ◽  
Aqueous Solution ◽  
Elemental Analysis ◽  
Spectroscopic Characterization ◽  
Magnesium Carbonate ◽  
X Ray Diffraction ◽  
Triclinic Space Group ◽  
X Ray ◽  
Ir Spectroscopic

AbstractMagnesium acesulfamate, Mg(C4H4NO4S)2·6H2O, was prepared by the reaction of acesulfamic acid and magnesium carbonate in aqueous solution, and characterized by elemental analysis. Its crystal structure was determined by single crystal X-ray diffraction methods. The substance crystallizes in the triclinic space group P1̅ with one molecule per unit cell. The FTIR spectrum of the compound was also recorded and is briefly discussed. Some comparisons with other simple acesulfamate and saccharinate salts are also made.

Hydrothermal Synthesis and Structural Characterization of Orthorhombic LiMnO2 with Low Stacking Faults

2015 ◽  
Vol 1120-1121 ◽  
pp. 174-178
Author(s):  
Li Zhu Zhao ◽  
G. Chen
Keyword(s):  
Aqueous Solution ◽  
Structural Characterization ◽  
Stacking Faults ◽  
Lithium Hydroxide ◽  
Orthorhombic Structure ◽  
X Ray Diffraction ◽  
Hydrothermal Technique ◽  
X Ray

LiMnO2 are synthesized by hydrothermal technique by using Mn(CH3COO)2.4H2O and MnO2 with the same mole ratio which are dissolved in aqueous solution with different concentration LiOH. Structural characterization based on X-ray diffraction and Raman spectroscopy reveals that LiMnO2 is in a well-order orthorhombic structure with lower stacking faults compared to the LiMnO2 prepared by other techniques. Experimental results show that the concentration of lithium hydroxide in aqueous solution affect the quality of LiMnO2.

Biosorption of Zn(II) from Aqueous Solution by Amusium pleuronectes Shell

2016 ◽  
Vol 675-676 ◽  
pp. 7-10
Author(s):  
K. Chantarasunthon ◽  
Kanyakorn Teanchai ◽  
Wichian Siriprom
Keyword(s):  
Aqueous Solution ◽  
Experimental Investigation ◽  
Contact Time ◽  
Physical Adsorption ◽  
Absorption Capacity ◽  
X Ray Diffraction ◽  
Batch Method ◽  
Solution Ph ◽  
X Ray ◽  
High Level

In this study, the experimental investigation and assessment the absorption capacity for Zn ion with Amusium Pleuronectes shell. The investigations were carried out by batch method and variables of the batch experiment include solution pH, Contact time, were determind. The mechanism of bisorption is chemisorption or/and physical adsorption was confirmed by X-ray Diffraction (XRD) and Energy Dispersive X-ray Fluorescence (EDXRF). The results showed that the Amusium Pleuronectes shell has a high level of absorption capacity for Zn (II) ions. Another that result of mechanism of biosorption suggests and confirm with the result of XRD and EDXRF.

Synthesis and Characterization of a Three-dimensional Porous Compound: [Cu(H2O)6][{Cu(H2O)2}2{Cu(H2O)4H4W12O42}] · 12H2O

2008 ◽  
Vol 63 (2) ◽  
pp. 187-192 ◽  
Author(s):  
Chun-jing Zhang ◽  
Ya-guang Chen ◽  
Dong-mei Shi ◽  
Hai-jun Pang
Keyword(s):  
Aqueous Solution ◽  
Magnetic Susceptibility ◽  
Elemental Analysis ◽  
3D Structure ◽  
Three Dimensional ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vis Spectroscopy

A novel transition metal polyoxotungstate, [Cu(H2O)6][{Cu(H2O)2}2{Cu(H2O)4H4W12O42}] · 12H2O (1), has been synthesized in aqueous solution and characterized by single-crystal X-ray diffraction, elemental analysis, IR and UV/vis spectroscopy, and TG analysis. The paradodecatungstate anions [H2W12O42]10− are linked by CuO6 octahedra, forming a three-dimensional (3D) structure. The magnetic susceptibility of compound 1 in the temperature range 2 - 300 K shows the presence of antiferromagnetic interactions within the uniform Cu2・ ・ ・Cu3 chains

scholarly journals Obtaining adsorbents from acid and acid-thermal activation of bentonite for chlorothalonil pesticide removal

2020 ◽  
Vol 15 (3) ◽  
pp. 812-825
Author(s):  
Nadia Boudouara ◽  
Réda Marouf ◽  
Jacques Schott
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Thermal Activation ◽  
X Ray Diffraction ◽  
Acid Attack ◽  
Experimental Conditions ◽  
X Ray ◽  
Pesticide Removal ◽  
Freundlich Equation ◽  
Pseudo Second Order

Abstract Bentonite samples collected from M'Zila of Mostaganem (Algeria) were treated in first protocol with sulfuric acid at concentrations 1, 3 and 6N. The second protocol concerns the acid attack of bentonite combined with thermal treatment at temperatures of 100 and 200 °C. The obtained adsorbents were characterized by different analyses techniques such as chemical composition, X-ray diffraction (XRD), specific surface area and pHPZC. The modified bentonites were used for removal of Chlorothalonil (Chl) from aqueous solution. The adsorption behavior of the pesticide was studied under different experimental conditions of pH, contact time, concentration of Chl and temperature of solution. The adsorption of Chl followed pseudo-second order kinetics and was described by the Freundlich equation. Thermodynamic study revealed that Chl adsorption was endothermic and physical in nature.

Characterization of Electrophoretically Deposited Chitosan Coatings on Ti13Zr13Nb Alloy for Biomedical Applications

2013 ◽  
Vol 203-204 ◽  
pp. 212-215 ◽  
Author(s):  
Bożena Łosiewicz ◽  
Grzegorz Dercz ◽  
Magdalena Szklarska ◽  
Wojciech Simka ◽  
Marta Łężniak ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Biomedical Applications ◽  
X Ray Diffraction ◽  
Bioactive Coatings ◽  
X Ray ◽  
Scanning Electron ◽  
Deposition Conditions

The chitosan (CH) coatings on a Ti13Zr13Nb alloy substrate were obtained by electrophoretic deposition (EPD). The EPD yield was investigated under different deposition conditions. The microstructure of the CH coatings obtained by cataphoresis was studied by scanning electron microscopy and the chemical composition was examined using EDAX. The functional groups and formed phases were analyzed using Fourier transform infrared spectroscopy and X-ray diffraction, respectively. It was found that the CH coating thickness and porosity can be controlled by time and voltage used for the EPD process. It was ascertained that the studied EPD of the natural biopolymer, chitosan, in aqueous solution is applicable for the surface modification of the Ti13Zr13Nb implants to develop novel bioactive coatings.

scholarly journals Investigation the Effects of Green-Synthesized Copper Nanoparticles on the Performance of Activated Carbon-Chitosan-Alginate for the Removal of Cr(VI) from Aqueous Solution

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2617
Author(s):  
Inas A. Ahmed ◽  
Hala S. Hussein ◽  
Ahmed H. Ragab ◽  
Najla AlMasoud ◽  
Ayman A. Ghfar
Keyword(s):  
Electron Microscopy ◽  
Activated Carbon ◽  
Contact Time ◽  
Sem Analysis ◽  
Adsorption Efficiency ◽  
X Ray Diffraction ◽  
X Ray ◽  
Chromium Vi ◽  
Transmission Electron ◽  
Freundlich Adsorption Isotherm

In the present investigation, green nano-zerovalent copper (GnZVCu), activated carbon (AC), chitosan (CS) and alginate (ALG) nanocomposites were produced and used for the elimination of chromium (VI) from a polluted solution. The nanocomposites GnZVCu/AC-CS-alginate and AC-CS-alginate were prepared. Analysis and characterization were performed by the following techniques: X-ray diffraction, energy dispersive X-ray spectroscopy, scanning electron microscopy, transmission electron microscopy and Fourier transform infrared spectroscopy. The SEM analysis revealed that the nanocomposites are extremely mesoporous, which leads to the greatest adsorption of Cr+6 (i.e., 97.5% and 95%) for GnZVCu/AC-CS-alginate and AC-CS-alginate, respectively. The adsorption efficiency was enhanced by coupling GnZVCu with AC-CS-alginate with a contact time of 40 min. The maximum elimination of Cr+6 with the two nanocomposites was achieved at pH 2. The isotherm model, Freundlich adsorption isotherm and kinetics model and P.S.O.R kinetic models were discovered to be better suited to describe the exclusion of Cr+6 by the nanocomposites. The results suggested that the synthesized nanocomposites are promising for the segregation of Cr+6 from polluted solutions, specially the GnZVCu/AC-CS-alginate nanocomposite.

scholarly journals Preparation and characterization of self-reinforced paper using NaOH/thiourea aqueous solution at room temperature

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 8191-8201
Author(s):  
Fuqiang Hu ◽  
Yucheng Hu ◽  
Lingling Zhang ◽  
Meixue Gan ◽  
Shangjun Liu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Room Temperature ◽  
Paper Strength ◽  
X Ray Diffraction ◽  
Fixed Temperature ◽  
Crystallinity Degree ◽  
X Ray ◽  
Scanning Electron

The aim of this paper was to enhance paper strength in NaOH/thiourea aqueous solution at room temperature. Paper from cotton pulp was saturated with room temperature NaOH/thiourea aqueous solution and placed at a fixed temperature (8, 15, and 20 °C) for a period of time (1 h, 2 h, 4 h, and 6 h). The morphology, X-ray diffraction (XRD), mechanical properties, and density of paper were characterized. The results indicated the paper was self-reinforced. Scanning electron microscopy (SEM) photographs indicated that the structure of the treated papers was increasingly compact with decreasing temperature. The XRD results showed that the crystallinity degree of the paper decreased from 80.0% to 60.0%. The stress at break of the treated papers increased by more than fivefold. The wet tensile strength of the treated papers increased remarkably.

scholarly journals ADSORPTION OF PHENOL POLLUTANTS FROM AQUEOUS SOLUTION USING Ca-BENTONITE/CHITOSAN COMPOSITE

2015 ◽  
Vol 22 (2) ◽  
pp. 233 ◽  
Author(s):  
Poedji Loekitowati Hariani ◽  
Fatma Fatma ◽  
Fahma Riyanti ◽  
Hesti Ratnasari
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Contact Time ◽  
Batch Adsorption ◽  
Shrimp Waste ◽  
Initial Concentration ◽  
X Ray ◽  
Chitosan Composite ◽  
Scanning Electron

Phenolic compounds areorganic pollutants that are toxic and carcinogenic.The presence of phenol in the environmentcan be adverse to humanand the environmentalsystem. One methodthat iseffective toreduce thephenolisadsorption. In this study, the adsorption of phenol in aqueous solution using Ca-bentonite/chitosan composite was investigated. Chitosan is the deacetylation product of chitin from shrimp waste. Characterization of Ca-bentonite/chitosan composite was done by using Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy-Energy Dispersive X Ray Spectroscopy (SEM-EDX). Batch adsorption studies were performed to evaluate the effects of some parameters such as initial concentration of phenol, composite weight, pH and contact time. The results showed that FTIR spectra of Ca-bentonite/chitosan composite presented the characteristic of peak of Ca-bentonite and chitosan that confirmed the successful synthesis of composite. The SEM-EDX characterizationresultsshowedCa-bentonite surfacecoverage by chitosanand the presence ofcarbonandnitrogenelementsinCa-bentonite/chitosancompositeindicated that chitosan had bonded with bentonite. The optimum condition of adsorption of Ca-bentonite/chitosan to phenol was obtained at 125 mg.L-1 of concentration in which the weight of composite was 1.0 g, the pH of solution was 7, the contact time was 30 minutes, and the capacity of adsorption was 12.496 mg.g-1.

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