scholarly journals Effective Microporosity for Enhanced Adsorption Capacity of Cr (VI) from Dilute Aqueous Solution: Isotherm and Kinetics

2017 ◽  
Vol 19 (4) ◽  
pp. 1-12 ◽  
Author(s):  
Lloyd Mukosha ◽  
Maurice Onyango ◽  
Aoyi Ochieng ◽  
John Siame
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Dilute Aqueous Solution ◽  
Enhanced Adsorption

Preparation of crosslinked chitosan magnetic membrane for cations sorption from aqueous solution

2017 ◽  
Vol 75 (9) ◽  
pp. 2034-2046 ◽  
Author(s):  
Adnan Khan ◽  
Samina Begum ◽  
Nauman Ali ◽  
Sabir Khan ◽  
Sajjad Hussain ◽  
...  
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Magnetic Particles ◽  
Isotherm Models ◽  
Chitosan Membrane ◽  
Dilute Aqueous Solution ◽  
Chitosan Membranes ◽  
The Fourier Transform ◽  
Time Required

A chitosan magnetic membrane was prepared in order to confer magnetic properties to the membrane, which could be used for the removal of cations from aqueous solution. The crosslinked magnetic membrane was compared with pristine chitosan membrane in term of stability, morphology and cation adsorption capacity. The fabricated magnetic materials are thermally stable as shown by thermogravimetric curves. The membrane containing nickel magnetic particles (CHNiF-G) shows high thermal stability compared to the other membranes. The Fourier transform infrared spectroscopy showed successful preparation of chitosan magnetic membrane. Scanning electron microscopy micrographs showed the rough surface of the membrane with increased porosity. The prepared chitosan membranes were applied to cations of copper, nickel and lead in dilute aqueous solution. The chitosan membrane showed the following adsorption order for metallic cations: Cu2+ > Ni2+ > Pb2+, while CHNiF-G showed higher capacity, 3.51 mmol g−1 for copper, reflecting the improvement in adsorption capacity, since the amount of copper on pristine chitosan gave 1.40 mmol g−1. The time required for adsorption to reach to the equilibrium was 6 h for the selected cations using different chitosan membranes. The kinetic study showed that adsorption followed pseudo-second order kinetics. The most commonly used isotherm models, Freundlich, Langmuir and Temkin, were applied to experimental data using linear regression technique. However, The Temkin model fits better to experimental data.

scholarly journals Preparation, Characterization and Adsorption Potential of Grainy Halloysite-CNT Composites for Anthracene Removal from Aqueous Solution

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 890 ◽  
Author(s):  
Gabriela Kamińska ◽  
Mariusz Dudziak ◽  
Edyta Kudlek ◽  
Jolanta Bohdziewicz
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Process ◽  
Heating Temperature ◽  
Langmuir Model ◽  
Adsorption Potential ◽  
Adsorption Sites ◽  
Enhanced Adsorption

Grainy Hal-CNT composites were prepared from powder halloysite nanoclay (Hal) and carbon nanotubes (CNTs). The effect of the amount and type of CNTs, as well as calcination temperature on morphology and properties of Hal-CNT composites and their adsorption capacity of anthracene (ANT), were studied. The surface topography of granules was heterogenous, with cracks and channels created during granulation of powder clay and CNTs. In FTIR, spectra were exhibited only in the bands arising from halloysite, due to its dominance in the granules. The increase in the heating temperature to 550 °C resulted in mesoporosity/macroporosity of the granules, the lowest specific surface area (SSA) and poorest adsorption potential. Overall, SSA of all Hal-CNT composites were higher than raw Hal, and by itself, heated halloysite. The larger amount of CNTs enhanced adsorption kinetics due to the more external adsorption sites. The equilibrium was established with the contact time of approximately 30 min for the sample Hal-SWCNT 85:15, while the samples with loading 96:4, it was 60–90 min. Adsorption isotherms for ANT showed L1 type, which is representative for the sorbents with limited adsorption capacity. The Langmuir model described the adsorption process, suggesting a monolayer covering. The sample Hal-SWCNT 85:15 exhibited the highest adsorption capacity of ANT, due to its highest SSA and microporous character.

SBA-15 functionalised with high loading of amino or carboxylate groups as selective adsorbent for enhanced removal of toxic dyes from aqueous solution

2016 ◽  
Vol 40 (4) ◽  
pp. 3622-3634 ◽  
Author(s):  
Haribandhu Chaudhuri ◽  
Subhajit Dash ◽  
Ashis Sarkar
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
High Loading ◽  
Toxic Dyes ◽  
Carboxylate Groups ◽  
Selective Adsorbent ◽  
Enhanced Adsorption

Amino- or carboxylate-functionalised SBA-15 acts as a selective adsorbent and shows enhanced adsorption capacity for toxic dyes.

scholarly journals Correction: Efficient Removal of Co2+ from Aqueous Solution by 3-Aminopropyltriethoxysilane Functionalized Montmorillonite with Enhanced Adsorption Capacity

PLoS ONE ◽  
2016 ◽  
Vol 11 (9) ◽  
pp. e0164219
Author(s):  
Zhujian Huang ◽  
Pingxiao Wu ◽  
Beini Gong ◽  
Yaping Dai ◽  
Pen-Chi Chiang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Efficient Removal ◽  
Enhanced Adsorption

scholarly journals Efficient Removal of Co2+ from Aqueous Solution by 3-Aminopropyltriethoxysilane Functionalized Montmorillonite with Enhanced Adsorption Capacity

PLoS ONE ◽  
2016 ◽  
Vol 11 (7) ◽  
pp. e0159802 ◽  
Author(s):  
Zhujian Huang ◽  
Pingxiao Wu ◽  
Beini Gong ◽  
Yaping Dai ◽  
Pen-Chi Chiang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Efficient Removal ◽  
Enhanced Adsorption

Carbon dots decorated magnetic ZnFe 2 O 4 nanoparticles with enhanced adsorption capacity for the removal of dye from aqueous solution

2018 ◽  
Vol 433 ◽  
pp. 790-797 ◽  
Author(s):  
Weilong Shi ◽  
Feng Guo ◽  
Huibo Wang ◽  
Changan Liu ◽  
Yijun Fu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Carbon Dots ◽  
Enhanced Adsorption

Enhanced adsorption capacity and selectivity toward inorganic and organic mercury ions from aqueous solution by dye-affinity adsorbents

2018 ◽  
Vol 38 (s1) ◽  
pp. S54-S67 ◽  
Author(s):  
Norasikin Saman ◽  
Khairiraihanna Johari ◽  
Shiow-Tien Song ◽  
Helen Kong ◽  
Siew-Chin Cheu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Mercury Ions ◽  
Organic Mercury ◽  
Enhanced Adsorption ◽  
Inorganic And Organic

Graphene oxide enhanced adsorption capacity of chitosan/magnetite nanocomposite for Cr(VI) removal from aqueous solution

2018 ◽  
Vol 6 (2) ◽  
pp. 025018 ◽  
Author(s):  
Hoang V Tran ◽  
Tuong L Tran ◽  
Truong D Le ◽  
Thu D Le ◽  
Hang M T Nguyen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Enhanced Adsorption
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