Removal of nickel ions from aqueous solution by low energy-consuming sorption process involving thermosensitive copolymers with phosphonic acid groups

2013 ◽  
Vol 244-245 ◽  
pp. 507-515 ◽  
Author(s):  
Alain Graillot ◽  
Denis Bouyer ◽  
Sophie Monge ◽  
Jean-Jacques Robin ◽  
Catherine Faur
Keyword(s):  
Aqueous Solution ◽  
Phosphonic Acid ◽  
Sorption Process ◽  
Low Energy ◽  
Nickel Ions ◽  
Energy Consuming ◽  
Phosphonic Acid Groups ◽  
Thermosensitive Copolymers

Removal of metal ions from aqueous effluents involving new thermosensitive polymeric sorbent

2013 ◽  
Vol 67 (6) ◽  
pp. 1181-1187 ◽  
Author(s):  
A. Graillot ◽  
S. Djenadi ◽  
C. Faur ◽  
D. Bouyer ◽  
S. Monge ◽  
...  
Keyword(s):  
Water Solution ◽  
Sorption Properties ◽  
Molar Ratio ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Nickel Ions ◽  
Aqueous Effluents ◽  
Removal Of Metal Ions ◽  
Phosphonic Acid Groups ◽  
Thermosensitive Copolymers

In this work, new thermosensitive copolymers bearing phosphonated groups were synthesized and used to remove metal pollution. Sorption properties are brought by hydrolyzed (dimethoxyphosphoryl)methyl 2-methylacrylate (hMAPC1) monomer. N-n-propylacrylamide (NnPAAm) led to the thermoresponsive properties of the copolymers. Low lower critical solution temperature (LCST) values were observed, ranging between 20 and 25 °C depending on the molar ratio of each monomer in the copolymer. Sorption properties of these copolymers towards nickel ions were evaluated for increasing temperatures (10–40 °C), Ni ion concentrations of 20 mg L−1 and pH values between 3 and 7. Best results were observed for temperatures just lower than the LCST (20 °C), when the copolymer was fully soluble in water solution. For temperature higher than the LCST, phosphonic diacid groups accessibility was considerably reduced by the precipitation of the thermosensitive part of the copolymer leading to lower sorption properties. In these conditions, the highest Ni removal by the copolymer was observed for pH = 7, when there was almost no competition between the sorption of H+ and Ni2+ ions on the phosphonic acid groups. These optimal conditions enabled removal of about 70% of the nickel in the synthetic effluent.

scholarly journals Nickel Sorption onto Chitosan - Silica Hybrid Aerogel from Aqueous Solution

2021 ◽  
Vol 18 (9) ◽  
Author(s):  
Kelechi EBISIKE ◽  
Afamefuna Elvis OKORONKWO ◽  
Kenneth Kanayo ALANEME
Keyword(s):  
Aqueous Solution ◽  
Hydrochloric Acid ◽  
Agricultural Waste ◽  
Sorption Process ◽  
Ion Concentration ◽  
Nickel Ion ◽  
Nickel Ions ◽  
Sorption System ◽  
Silica Hybrid ◽  
Hybrid Aerogel

The utilization and efficiency of agricultural waste-derived chitosan-silica hybrid aerogel “(CS)hA” on nickel removal from aqueous solution was examined and optimum parameters for pH, contact time, and initial ion concentration were determined during batch sorption system studies. Metal recovery was performed on the adsorbent using separately dilute concentrations of hydrochloric acid, acetic acid, ammonia, and sodium hydroxide solutions as eluents. The results generated were analyzed from kinetic and isotherm studies. The maximum Ni2+ adsorption of 99.78 % was established at 60 min and pH 3 in this study. The batch studies revealed that the percentage of nickel ion removal by the adsorbent decreased along with an increase in the initial Ni2+ ions concentration. The pseudo-second-order, the best fit of the kinetic model, has the values of its correlation coefficient “R2” ranging from 0.9 to 1, whereas the Langmuir model which had the maximum monolayer adsorption capacity of 85.84 mg g-1, was the best isotherm in interpreting the sorption process and the calculated separation factor was higher than 0 but less than 1. Dilute hydrochloric acid (0.1 M) was the best eluent in removing bound nickel ions (55.63 %) from (CS)hA.

Membrane ion channels and ionic hydration energies

1980 ◽  
Vol 211 (1182) ◽  
pp. 51-62 ◽  
Keyword(s):  
Aqueous Solution ◽  
Ion Channels ◽  
Binding Sites ◽  
Low Energy ◽  
Electrostatic Energy ◽  
Ionic Hydration ◽  
Ionic Size ◽  
Hydration Energies ◽  
Ordered Water

The difficulty of modelling ion channels in membranes due to the low electrostatic energy of small ions in aqueous solution is discussed. Models based upon ordered water cage structures are shown to provide suitable low energy binding sites which are selective both for unhydrated ionic size and valence. The barriers for motion of ions within these channels are shown to be low.

Preparation of perfluorocarbon polymers containing phosphonic acid groups

1997 ◽  
Vol 82 (1) ◽  
pp. 13-19 ◽  
Author(s):  
Stefan V. Kotov ◽  
Scot D. Pedersen ◽  
Weiming Qiu ◽  
Zai-Ming Qiu ◽  
Donald J. Burton
Keyword(s):  
Phosphonic Acid ◽  
Phosphonic Acid Groups

scholarly journals Adsorption of aquatic Cd2+ using a combination of bacteria and modified carbon fiber

2017 ◽  
Vol 36 (3-4) ◽  
pp. 857-871 ◽  
Author(s):  
Chao Xue ◽  
Peishi Qi ◽  
Yunzhi Liu
Keyword(s):  
Aqueous Solution ◽  
Composite Material ◽  
Carbon Fiber ◽  
Active Sites ◽  
Ph Value ◽  
Removal Rate ◽  
Sorption Process ◽  
Acid Sites ◽  
Heterogeneous Distribution ◽  
Carbon Fiber Material

Batch experiments were conducted to investigate the capacity and mechanisms for adsorbing Cd2+ from aqueous solutions by the composite material. The composite material was manufactured with Plesiomonas shigelloides strain H5 and modified polyacrylonitrile-based carbon fiber. Experimental results showed that the surface areas of modified polyacrylonitrile-based carbon fiber increased by 58.54% and pore width increased by 40.19% compared with unmodified polyacrylonitrile-based carbon fiber. Boehm’s titration results show the surface acid sites of composite material were increased by 712% compared with unmodified polyacrylonitrile-based carbon fiber. The field emission scanning electron microscope results show P. shigelloides H5 can be grown on the surface of modified polyacrylonitrile-based carbon fiber closely. The equilibrium removal rate and sorption quantity of composite material were 71.56% and 7.126 mg g−1, respectively. With the pH value of aqueous solution increased, the removal rate of Cd2+ ions was also increased, but the change of temperature and ionic strength had no significant effect on the removal rate. Furthermore, the results showed the whole sorption process was a good fit to Lagergren pseudo-second-order model and Freundlich isotherms model. Therefore, the results infer that there was a heterogeneous distribution of active sites, and then the sorption process was chemical adsorption and multilayer adsorption. In a word, microbial composite carbon fiber material can adsorb Cd2+ ions from aqueous solution effectively, which might be helpful in wastewater treatment in the future.

scholarly journals Low Energy Consuming Modified Composite Cements and their Properties

2011 ◽  
Vol 5 (2) ◽  
pp. 227-230 ◽  
Author(s):  
Myroslav Sanytsky ◽  
◽  
Khrystyna Sobol ◽  
Mychailo Shcturmay ◽  
Olga Khymko ◽  
...  
Keyword(s):  
Low Energy ◽  
Energy Consuming ◽  
Composite Cements
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