Functional group penetration thickness and intraparticle diffusivity of electrospun poly(acrylonitrile) ion-exchange fibers

2017 ◽  
Vol 295 (10) ◽  
pp. 2069-2075
Author(s):  
Tabish Nawaz ◽  
Manisha Jassal ◽  
Sukalyan Sengupta ◽  
Sankha Bhowmick
Keyword(s):  
Ion Exchange ◽  
Functional Group ◽  
Intraparticle Diffusivity ◽  
Poly Acrylonitrile

Adsorptive interactions between metaldehyde and sulfonic functional group in ion exchange resin

2020 ◽  
Vol 313 ◽  
pp. 113555
Author(s):  
Mohammednoor Altarawneh ◽  
Daniela Waters ◽  
Bee-Min Goh ◽  
Zhong-Tao Jiang ◽  
Mohanad El-Harbawi ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Functional Group ◽  
Exchange Resin ◽  
Ion Exchange Resin

Combined bio-regeneration and ion-exchange system for perchlorate removal

2014 ◽  
Vol 69 (9) ◽  
pp. 1956-1960 ◽  
Author(s):  
B. U. Bae
Keyword(s):  
Ion Exchange ◽  
Suspended Solids ◽  
Functional Group ◽  
Direct Reduction ◽  
Anaerobic Conditions ◽  
Exchange System ◽  
Perchlorate Ion ◽  
Solids Concentration ◽  
Regeneration Efficiency ◽  
Reducing Bacteria

In order to prove that perchlorate-laden resins could be bio-regenerated through direct contact with perchlorate-reducing bacteria (PRB), a combined bio-regeneration and ion-exchange (IX) system was operated. Two kinds of perchlorate-laden resins, nitrate-selective A520E and perchlorate-selective A530E, were successfully regenerated by PRB cultivated under anaerobic conditions. The bio-regeneration efficiency of perchlorate-laden resins increased with the amount of flow passed through the IX column. When the fully exhausted resin was bio-regenerated for 10 days at the flow rate of 2 BV (bed volume)/min and mixed liquor suspended solids concentration of 80 mg/L, almost 100% of IX capacity was recovered. A520E resin had higher bio-regeneration efficiency than A530E under all conditions, probably due to the fact that the perchlorate ion is more strongly bonded to the functional group of perchlorate-selective A530E resin. Measurement of perchlorate concentrations in the column effluents also revealed that the amount of perchlorate eluted from A520E resin was higher than that from A530E resin. Since only 10–20% of perchlorate was eluted from the resin during 10 days of bio-regeneration, the main mechanism of bio-regeneration appears to be the direct reduction of perchlorate by PRB on the resin.

scholarly journals ADSORPTION OF Ca(II), Pb(II) AND Ag(I) ON SULFONATO-SILICA HYBRID PREPARED FROM RICE HULL ASH

2011 ◽  
Vol 11 (3) ◽  
pp. 273-278 ◽  
Author(s):  
Siti Sulastri ◽  
Nuryono Nuryono ◽  
Indriana Kartini ◽  
Eko Sri Kunarti
Keyword(s):  
Aqueous Solution ◽  
Ion Exchange ◽  
Functional Group ◽  
Sodium Hydroxide Solution ◽  
Exchange Capacity ◽  
Rice Hull ◽  
Rice Hull Ash ◽  
Ion Exchange Capacity ◽  
X Ray ◽  
Silica Hybrid

In this research, adsorption of Ca(II), Pb(II) and Ag(I) in aqueous solution onto sulfonato-silica hybrid (SSH) prepared from rice hull ash (RHA) has been studied. The preparation of SSH adsorbent was carried out by oxidation of mercapto-silica hybrid (MSH) with hydrogen peroxide (H2O2) solution 33%. MSH was prepared, via sol-gel process, by adding 3 M hydrochloric acid solution to mixture of sodium silicate (Na2SiO3) solution and 3(trimethoxysilyl)-1-propanthiol (MPTS) to reach pH of 7.0. Solution of Na2SiO3 was generated from destruction of RHA with sodium hydroxide solution followed with heating at 500 °C for 30 min. The SSH produced was characterized with Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) analyzer, energy dispersive X-ray (EDX) spectroscopy and determination of ion-exchange capacity for sodium ion (Na+). The adsorption of Ag(I) and Ca(II) were conducted in a batch system in various concentrations for one hour. The adsorbent ion was calculated based on difference of concentrations before and after adsorption process determined using atomic absorbance spectrophotometric (AAS) method. The adsorption character was evaluated using model of isotherm Langmuir and Freundlich adsorption to calculate the capacity, constants and energy of adsorption. Result of characterization by EDX and FTIR showed qualitatively that SSH has been successfully synthesized which were indicated by appearance of characteristic absorbance of functional group namely silanol (Si-OH), siloxane (Si-O-Si), methylene (-CH2-) and disappearance of mercapto group (SH). The XRD data showed amorphous structure of SSH, similar to silica gel (SG) and MSH. The study of adsorption thermodynamics showed that oxidation of MSH into SSH increases the ion-exchange capacity for Na+ from 0.123 to 0.575 mmol/g. The change in functional group from silanol to mercapto and from mercapto to sulfonato increases the adsorption capacity of Ca(II). However, the capacity order of adsorbents for both ions of Pb(II) and Ag(I) in aqueous solution is MSH > SG > SSH.

Sign in / Sign up

Export Citation Format

Share Document