Identification of the Chromate Sorption Mechanism Conversions in a Quartz–Montmorillonite–Ferrihydrite System

Author(s):  
Zhe Yang ◽  
Yu Ning ◽  
Chang He ◽  
Yumei Li ◽  
Sen Yang ◽  
...  
Keyword(s):  
Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3541
Author(s):  
Ion Ion ◽  
Daniela Bogdan ◽  
Monica Maria Mincu ◽  
Alina Catrinel Ion

In this manuscript an improved sorbent based on modified exfoliated carbon nanoplatelets, applied in the removal of ammonium from aqueous samples, is presented. This sorbent showed better efficiency in comparison with the previous one obtained in our group for ammonium removal, the values of the maximum sorption capacity being improved from 10 to 12.04 mg/g. In terms of kinetics and sorption characteristic parameters, their values were also improved. Based on these results, a sorption mechanism was proposed, taking into account ion-exchange and chemisorption processes at the surface of the oxidized exfoliated carbon nanoplatelets. Future applications for simultaneous removal of other positive charged contaminants from natural waters might be possible.


1995 ◽  
Vol 412 ◽  
Author(s):  
K. Noshita ◽  
T. Nishi ◽  
M. Matsuda ◽  
T. Izumida

AbstractCarbon-14 sorption by cementitious materials should be enhanced to ensure the long term safety of radioactive waste repositories. The sorption mechanism of inorganic C- 14 (CO32- was investigated using batch sorption experiments and zeta potential measurements. The results suggested that C-14 was adsorbed onto the cement surface by an electrostatic force, due to the reaction between SiO2 and CaO contained in the cementitious composition. That is, SiO2 was originally negatively charged (SiO-) in cement, but became positively charged through the interaction of Ca2+. These positive sites on the SiO2 surface adsorbed inorganic C-14. Ordinary Portland cement (OPC) did not contain enough SiO2 compared with its CaO content to produce sufficient numbers of C-14 adsorption sites. The C-14 distribution coefficient (Kd) was increased from 2,000 to 7,000 mL/g by adding SiO2 to OPC.


2018 ◽  
Vol 8 (7) ◽  
pp. 1181 ◽  
Author(s):  
Svetlana Kononova ◽  
Galina Gubanova ◽  
Eleonora Korytkova ◽  
Denis Sapegin ◽  
Katerina Setnickova ◽  
...  

Based on the results of research works reflected in the scientific literature, the main examples, methods and approaches to the development of polymer inorganic nanocomposite materials for target membranes are considered. The focus is on membranes for critical technologies with improved mechanical, thermal properties that have the necessary capabilities to solve the problems of a selective pervaporation. For the purpose of directional changes in the parameters of membranes, effects on their properties of the type, amount and conditions of nanoparticle incorporation into the polymer matrix were analyzed. An influence of nanoparticles on the structural and morphological characteristics of the nanocomposite film is considered, as well as possibilities of forming transport channels for separated liquids are analyzed. Particular attention is paid to a correlation of nanocomposite structure-transport properties of membranes, whose separation characteristics are usually considered within the framework of the diffusion-sorption mechanism.


1997 ◽  
Vol 34 (1) ◽  
pp. 58-62 ◽  
Author(s):  
Toshihiko OHNUKI ◽  
Naofumi KOZAI ◽  
Hiroshi ISOBE ◽  
Takashi MURAKAMI ◽  
Shunya YAMAMOTO ◽  
...  

2013 ◽  
Vol 71 (2) ◽  
pp. 623-630 ◽  
Author(s):  
Caixia Yan ◽  
Yi Yang ◽  
Min Liu ◽  
Minghua Nie ◽  
Lijun Gu ◽  
...  

Adsorption ◽  
2019 ◽  
Vol 25 (4) ◽  
pp. 865-880 ◽  
Author(s):  
Filip Ciesielczyk ◽  
Sonia Żółtowska-Aksamitowska ◽  
Katarzyna Jankowska ◽  
Joanna Zembrzuska ◽  
Jakub Zdarta ◽  
...  

2019 ◽  
Vol 237 ◽  
pp. 552-559 ◽  
Author(s):  
Jie Li ◽  
Yu-Rong Liu ◽  
Li-Mei Zhang ◽  
Ji-Zheng He

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