Sorption interactions in system «hydroxyapatite—aqueous solution of CuSO4»

2021 ◽  
pp. 13-20
Author(s):  
T.V. Smotrina ◽  
◽  
O.V. Stoyanov ◽  
Keyword(s):  
Aqueous Solution ◽  
Kinetic Equation ◽  
Chemical Interaction ◽  
Nmr Relaxation ◽  
Diffusion Region ◽  
Order Kinetic ◽  
Pseudo Second Order ◽  
Synthetic Hydroxyapatite ◽  
Process Speed ◽  
Order Kinetic Equation

Regularities of adsorption of copper (II) ions by synthetic hydroxyapatite have been examined. It is shown that sorption of metal ions occurs mainly in the mixed diffusion region, the chemical interaction described by the pseudo-second order kinetic equation has a significant effect on the process speed. It was found out that that the adsorption isotherm was described by the Langmuir monomolecular adsorption equation in the best way. Interaction specificity of hydroxyapatite with water was studied by NMR relaxation spectroscopy method

scholarly journals Adsorption Process and Properties Analyses of a Pure Magadiite and a Modified Magadiite on Rhodamine-B from an Aqueous Solution

Processes ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 565
Author(s):  
Mingliang Ge ◽  
Zhuangzhuang Xi ◽  
Caiping Zhu ◽  
Guodong Liang ◽  
Yinye Yang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Rhodamine B ◽  
Cetyltrimethylammonium Bromide ◽  
Low Cost ◽  
Order Kinetic ◽  
Exchange Method ◽  
Layer Adsorption ◽  
Adsorption Processes ◽  
Pseudo Second Order ◽  
Order Kinetic Equation

The result of an adsorption experiment indicated that the pure magadiite (MAG) and the modified MAG via cetyltrimethylammonium-bromide (CTAB-MAG) possessed pronounced affinity to the Rhodamine-B (Rh-B) dye molecules. CTAB-MAG was synthesized with an ion-exchange method between MAG and cetyltrimethylammonium-bromide (CTAB) in an aqueous solution. The adsorption capacities of CTAB-MAG and MAG on Rh-B were 67.19 mg/g and 48.13 mg/g, respectively; while the pH and the time were 7 and 60 min, respectively; however, the initial concentration of Rh-B was 100 mg/L, and adsorbent dosage was 1 g/L. Whereas, the adsorption capacity of CTAB-MAG was increased by 40% over MAG which indicated that CTAB-MAG can be used as an efficient low-cost adsorbent. Adsorption kinetics were consistent with the pseudo-second-order kinetic equation; the adsorption processes were dominated by film diffusion process which belonged to monomolecular layer adsorption.

Adsorption Kinetics of Direct Red 4BS Using Stove Ash

2013 ◽  
Vol 726-731 ◽  
pp. 2833-2836
Author(s):  
Bo Yu ◽  
Wei Ming Wang ◽  
Di Ma ◽  
Zai Sheng Cai
Keyword(s):  
Kinetic Equation ◽  
Kinetic Parameters ◽  
Adsorption Kinetics ◽  
Waste Material ◽  
Order Kinetic ◽  
Initial Concentration ◽  
Adsorption Reaction ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Order Kinetic Equation

A waste material, stove ash, was applied to adsorbthe Direct Red 4BS. The dye amount absorbed by ash was improved with increasingthe dye initial concentration from 3g/Lto 7g/L. Dye was adsorbed within 2minutes and the equilibrium was achieved after 5 minutes. The kinetic of adsorptionreaction was also studied. The results showed that adsorption reaction was congruentwith Lagergren pseudo-second order kinetic equation, and different initial dyeconcentrations had their specific kinetic parameters.

Adsorption of Cu2+ from Aqueous Solution by Crosslinked Carboxymethyl Tamarind

2013 ◽  
Vol 781-784 ◽  
pp. 2100-2105 ◽  
Author(s):  
Chun Mei Niu ◽  
Shao Ying Li ◽  
Fang Lan
Keyword(s):  
Aqueous Solution ◽  
Kinetic Equation ◽  
Adsorption Capacity ◽  
Langmuir Isotherm ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Adsorption Capacities ◽  
Tamarind Kernel ◽  
Regeneration Study ◽  
Order Kinetic Equation

Crosslinked carboxymethyl tamarind (CCMTKP) with degree of substitution (DS) 0.42, 0.64 and 0.88 were prepared through reaction of sodium monochloroacetic acid (SMCA), epichlorohydrin (ECH) and tamarind kernel polysaccharide (TKP) and used to adsorb Cu2+ from aqueous solution. The appropriate range for pH was 2-6. The adsorption capacity rapidly reached equilibrium within 15 min and adsorption followed second-order kinetic equation. The adsorption of Cu2+ is well followed as the Langmuir isotherm and the maximum adsorption capacity (Qm) was 68.03 mg/g. The regeneration study indicates that CCMTKP could be used repeatedly without significantly changing their adsorption capacities.

Adsorption Characteristics of Phenol in Aqueous Solution by Pinus massoniana Biochar

2013 ◽  
Vol 295-298 ◽  
pp. 1154-1160 ◽  
Author(s):  
Guo Zhi Deng ◽  
Xue Yuan Wang ◽  
Xian Yang Shi ◽  
Qian Qian Hong
Keyword(s):  
Aqueous Solution ◽  
Ph Value ◽  
Pinus Massoniana ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Adsorbent Dosage ◽  
Salt Ions ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order

The objective of this paper is to investigate the feasibility of phenol adsorption from aqueous solution by Pinus massoniana biochar. Adsorption conditions, including contact time, initial phenol concentration, adsorbent dosage, strength of salt ions and pH, have been investigated by batch experiments. Equilibrium can be reached in 24 h for phenol from 50 to 250 mg• L-1. The optimum pH value for this kind of biochar is 5.0. The amount of phenol adsorbed per unit decreases with the increase in adsorbent dosage. The existence of salt ions makes negligible influence on the equilibrium adsorption capacity. The experimental data is analyzed by the Freundlich and Langmuir isotherm models. Equilibrium data fits well to the Freundlich model. Adsorption kinetics models are deduced and the pseudo-second-order kinetic model provides a good correlation for the adsorbent process. The results show that the Pinus massoniana biochar can be utilized as an effective adsorption material for the removal of phenol from aqueous solution.

The Study on Formaldehyde Emission of Composite Floor and Activated Carbon Adsorption on Formaldehyde

2011 ◽  
Vol 243-249 ◽  
pp. 4956-4959
Author(s):  
Jian Chao Hao ◽  
Hui Fen Liu ◽  
Dong Ling Wei ◽  
Li Jun Shi ◽  
Jun Li Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Kinetic Equation ◽  
Formaldehyde Emission ◽  
Order Kinetic ◽  
Activated Carbon Adsorption ◽  
High Quality ◽  
Carbon Adsorption ◽  
Airtight Chamber ◽  
The Relationship ◽  
Order Kinetic Equation

The relationship between formaldehyde emission and time was researched and a mathematical model was developed which describes the variation of formaldehyde with time in the airtight chamber. It was found that high quality composite floor was in line with 0-order kinetic equation and low quality composite floor was in line with 1-order kinetic equation. Besides, the effect of activated carbon adsorption on formaldehyde was studied and the result showed that activated carbon had poor adsorption on formaldehyde for weak van der waals force.

Adsorption of Chromium (VI) from Aqueous Solution by Agricultural Waste Derived Activated Carbon

2013 ◽  
Vol 726-731 ◽  
pp. 2100-2106 ◽  
Author(s):  
Hua Zhang ◽  
Xue Hong Zhang ◽  
Yi Nian Zhu ◽  
Shou Rui Yuan
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Agricultural Waste ◽  
Order Kinetic ◽  
Chromium Vi ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Grapefruit Peel ◽  
Pseudo Second Order ◽  
C 30

Activated carbon prepared from grapefruit peel, an agricultural solid waste by-product, has been used for the adsorption of Cr(VI) from aqueous solution. The effects of adsorbent dosage, pH and temperature on adsorption of Cr(VI) were investigated. The maximum adsorption yield was obtained at the initial pH of 3. The dynamical data fit very well with the pseudo-second-order kinetic model and the calculated adsorption capacities (23.98, 24.33 and 24.81 mg/g) were in good agreement with experiment results at 20°C, 30°C and 40 °C for the 100 mg/L Cr(VI) solution. The Freundlich model (R2 values were 0.9198-0.9871) fitted adsorption data better than the Langmuir model. The calculated parameters confirmed the favorable adsorption of Cr(VI) on the activated carbon prepared from grapefruit peel.

scholarly journals Simultaneous removal of cationic and anionic dyes from aqueous solution by double functional groups modified bagasse

2020 ◽  
Vol 82 (10) ◽  
pp. 2159-2167
Author(s):  
Ru-yi Zhou ◽  
Jun-xia Yu ◽  
Ru-an Chi
Keyword(s):  
Aqueous Solution ◽  
Functional Groups ◽  
Order Kinetic ◽  
Anionic Dyes ◽  
Adsorption Capacities ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Amine Groups ◽  
Modified Adsorbents ◽  
Zeta Potential Analysis

Abstract Double functional groups modified bagasse (DFMBs), a series of new zwitterionic groups of carboxyl and amine modified adsorbents, were prepared through grafting tetraethylenepentamine (TEPA) onto the pyromellitic dianhydride (PMDA) modified bagasse using the DCC/DMAP method. DFMBs' ability to simultaneously remove basic magenta (BM, cationic dye) and Congo red (CR, anionic dye) from aqueous solution in single and binary dye systems was investigated. FTIR spectra and Zeta potential analysis results showed that PMDA and TEPA were successfully grafted onto the surface of bagasse, and the ratio of the amount of carboxyl groups and amine groups was controlled by the addition of a dosage of TEPA. Adsorption results showed that adsorption capacities of DFMBs for BM decreased while that for CR increased with the increase of the amount of TEPA in both single and binary dye systems, and BM or CR was absorbed on the modified biosorbents was mainly through electrostatic attraction and hydrogen bond. The adsorption for BM and CR could reach equilibrium within 300 min, both processes were fitted well by the pseudo-second-order kinetic model. The cationic and anionic dyes removal experiment in the binary system showed that DMFBs could be chosen as adsorbents to treat wastewater containing different ratios of cationic and anionic dyes.

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