scholarly journals Chemical adsorption of oxytetracycline from aqueous solution by modified molecular sieves

2016 ◽  
Vol 75 (5) ◽  
pp. 1221-1232 ◽  
Author(s):  
Junmin Lv ◽  
Yulong Ma ◽  
Xuan Chang ◽  
Junzhuo Fang ◽  
Lingyan Cai ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Adsorption Kinetics ◽  
Molecular Sieves ◽  
Molecular Sieve ◽  
Adsorption Mechanism ◽  
Chemical Adsorption ◽  
Base Property ◽  
Adsorption Sites ◽  
Adsorbed Amount

The removal of oxytetracycline (OTC) from aqueous solution on modified molecular sieve via adsorption was investigated in the present work. The copper(II) modified molecular sieve had the much higher adsorbed amount than unmodified one. The bigger pore, the more adsorption sites benefitted for the adsorbed amount of OTC. The exchanged amount of copper(II) and the acid-base property of solution were important factors influencing the removal efficiency. The adsorption kinetics, the adsorption isotherm, the adsorption thermodynamics and the proposed adsorption mechanism were studied. The analysis of adsorption isotherm indicated it is a monolayer adsorption. The fitting with adsorption kinetics, pseudo-second-order model, deduced chemical adsorption is the main rate controlling step. And the new formation of Cu-O chemical bond and the changes at bands of N-H vibration and C-N vibration by Fourier transform infrared spectrometer further confirmed the proposal adsorption mechanism was the chemical complexation of copper(II) in modified 13X with NH2 group of OTC. As the real exchanged amount of copper(II) was 149.07 mg·g−1 and the solution pH 7.0, the adsorption capacity of modified 13X for OTC reached the maximum of 2,396 mg·g−1 (with the initial concentration of 1,000 mg·L−1).

The Adsorption on Nano-Fe3O4 of Malachite Green from Aqueous Solution

Nano LIFE ◽  
2015 ◽  
Vol 05 (03) ◽  
pp. 1542005 ◽  
Author(s):  
Lu Fan ◽  
Ling Li ◽  
Keke Sun ◽  
Lebao Mao ◽  
Keke Liang ◽  
...  
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Malachite Green ◽  
Adsorption Kinetics ◽  
Langmuir Isotherm ◽  
High Adsorption ◽  
Isotherm Adsorption ◽  
High Adsorption Capacity ◽  
Nano Fe3o4

The adsorption of malachite green from an aqueous solution of magnetic Fe 3 O 4 was studied in view of the adsorption isotherm, kinetics and regeneration of the sorbent. The adsorption isotherm of MG on nano- Fe 3 O 4 composite followed the Langmuir isotherm. Adsorption kinetics was determined from the experimental data. The nano- Fe 3 O 4 can be recycled for reuse after regeneration through acetonitrile. The high adsorption capacity and excellent reusability made Fe 3 O 4 attractive for the removal of MG from aqueous solution.

Methylene Blue Adsorption by Synthetic Nano-Carbon-Hydroxylapatite

2013 ◽  
Vol 664 ◽  
pp. 326-330 ◽  
Author(s):  
Xian Hui Ma ◽  
Liu Ming Wu ◽  
Xiao Yao Guo ◽  
Mei Hua Zhang ◽  
An Liang Ma
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Methylene Blue ◽  
Reaction Time ◽  
Adsorption Isotherm ◽  
Adsorption Mechanism ◽  
Order Model ◽  
Batch Mode ◽  
Pseudo Second Order ◽  
Nano Carbon

Synthetic nano-carbon-hydroxylapatite was used to remove methylene blue (MB) from aqueous solution. The influence of various parameters such as reaction time, initial dye concentration and pH on the adsorption was investigated in batch mode and the adsorption mechanism was briefly discussed. The experimental results show that the uptake of MB was rapid and equilibrium could be reached in 30 minutes, and the uptake of MB increased with increasing initial dye concentration and pH. The pseudo-second-order model fits well to the kinetics and Henry adsorption isotherm can be used to describe the experimental data. The adsorption mechanism can be explained mainly by electrostatic attraction.

Adsorption of Ni2+ in aqueous solution by KMnO4 modified biomass: investigation on adsorption kinetics and modification mechanism

2021 ◽  
pp. 1-12
Author(s):  
Yuxing Tong ◽  
Qunshan Yan ◽  
Song Gao ◽  
Bin Xiong ◽  
Xiangbing Tang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Kinetics

A novel approach for the removal of radiocesium from aqueous solution by ZSM-5 molecular sieve

2018 ◽  
Vol 139 ◽  
pp. 231-237 ◽  
Author(s):  
Xiaoqing Gao ◽  
Peng Zhang ◽  
Junqiang Yang ◽  
Xuejie Sun ◽  
Yi Fu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Molecular Sieve ◽  
Novel Approach

Preparation and Characterization of Ni-Containing Aluminophosphate Molecular Sieves

2011 ◽  
Vol 418-420 ◽  
pp. 617-620
Author(s):  
Ying Sun ◽  
Lan Ying Ge
Keyword(s):  
Oxidation State ◽  
Molecular Sieves ◽  
Molecular Sieve ◽  
Crystalline Form ◽  
Spectroscopic Techniques ◽  
Tetrahedral Coordination ◽  
Tetrahedral Geometry ◽  
Nickel Ions ◽  
Aluminophosphate Molecular Sieves

Aluminophosphate molecular sieve and Ni(II)-containing APO-5 materials were synthesized hydrothermally and characterized by various analytical and spectroscopic techniques. It indicates that the nickel ions with a divalent oxidation state can incorporate into the tetrahedral coordination in mesoporous aluminophosphate very well. The better crystallizing temperature is explored. A stronger crystalline form is obtained with the addition of HF. Further, microporous aluminophosphate molecular sieves and Ni(II) ions remain in a tetrahedral geometry even after calcination at 550 °C.

Removal of Anionic Metalloid/Metals by PEI-Modified Corynebacterium glutamicum

2013 ◽  
Vol 825 ◽  
pp. 568-571
Author(s):  
Namgyu Kim ◽  
Munsik Park ◽  
Jongmoon Park ◽  
Donghee Park
Keyword(s):  
Aqueous Solution ◽  
Binding Site ◽  
Corynebacterium Glutamicum ◽  
Adsorption Mechanism ◽  
Competitive Inhibition ◽  
Aqueous System ◽  
Reduction Mechanism ◽  
Removal Mechanism ◽  
Sulfate Ion ◽  
Industrial Fermentation

An anionic biosorbent was derived from an industrial fermentation biowate, Corynebacterium glutamicum, by being cross-linked with polyethylenimine (PEI). A fiber form of the biosorbent was used to examine its potentiality of removing anionic metals such as As (V), Cr (VI) and Mn (VII) in aqueous system. As (V) and Cr (VI) were efficiently removed by the biosorbent through anionic adsorption mechanism. Sulfate ion seriously inhibited adsorption of the anionic metals through competitive inhibition with respect to the binding site of the biosorbent. In the case of Mn (VII), its removal mechanism by the biosorbent was not anionic adsorption. Mn (VII) was completely removed in aqueous phase, meanwhile, Mn (II) appeared and increased in proportion to the Mn (VII) depletion. As a result, adsorption coupled reduction was chosen as the mechanism of Mn (VII) removal by the biosorbent. In conclusion, the anionic biosorbent could be used to remove various anionic metals from aqueous solution through anionic adsorption or reduction mechanism.

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