A novel tetraethylenepentamine crosslinked chitosan oligosaccharide hydrogel for total adsorption of Cr(VI)

2019 ◽  
Vol 224 ◽  
pp. 115154 ◽  
Author(s):  
Jinfeng Mei ◽  
Hui Zhang ◽  
Zhongyu Li ◽  
Hongxiang Ou
2019 ◽  
Vol 3 (2) ◽  
pp. 27
Author(s):  
Emma Savitri ◽  
Natalia Suseno ◽  
Tokok Adiarto

Many mass-transfer applications have used chitosan membrane in separation processes. This research applied crosslinked chitosan membrane to sterillize bacterial growth media. Chitosan membranes having 79 % DD were produced by casting and drying chitosan solution. The images of the membrane were characterized by SEM and other characterizations such as permeability, permselectivity and tensile strength were investigated. The flux increased with longer submersion period but the rejection decreased. Otherwise, the flux decreased and rejection increased in line with an increase in curing temperature. Tensile strength increased with the increase of submersion period and curing temperature. The optimum conditions of crosslinking process are 2 hours of submersion periods and curing temperature at 90 oC.  It gives flux 5.8930 L/jam.m2, rejection 97.47 % and tensile strength 49640 kN/m2


1981 ◽  
Vol 46 (2) ◽  
pp. 340-353
Author(s):  
Pavel Zachař ◽  
Zdeněk Bastl ◽  
Jakub Adámek

Chemisorption of ethylene was studied on thin polycrystalline layers of nickel prepared by metal deposition in high vacuum and modified by preadsorbed oxygen. The volumetric method combined with the gas-phase analysis and the measurement of the electrical resistance changes of these layers were used. Already small amounts of preadsorbed oxygen of the order of 10-2 of the monolayer affect rather substantially the extent of ethylene chemisorption. The extent of the initial irreversible chemisorption and also the total adsorption of ethylene as a function of the amount of preadsorbed oxygen have a maximum at the surface oxygen concentration of 3 . 1013 molecule cm-2. The adsorption accompanied by the extensive dissociation of ethylene C-H bonds proceeds predominantly on nickel atoms with lower coordination (atoms on the microcrystal edges, corner atoms, etc.), where also oxygen chemisorption proceeds preferentially.


2021 ◽  
Vol 183 ◽  
pp. 2293-2304
Author(s):  
Nahum Andrés Medellín-Castillo ◽  
Elizabeth Diane Isaacs-Páez ◽  
Itzia Rodríguez-Méndez ◽  
Raul González-García ◽  
Gladis Judith Labrada-Delgado ◽  
...  

2021 ◽  
Author(s):  
Madhvi Garg ◽  
Navneet Bhullar ◽  
Bharat Bajaj ◽  
Dhiraj Sud

The present manuscript reports the ultrasound radiation induced synthesis of grafted chitosan hydrogels (CAAT and CAAG) using terephthalaldehyde/glutaraldehyde as crosslinking agents and its application for removal of synthetic dyes from...


Author(s):  
Abdelfattah Amari ◽  
Noureddine Elboughdiri ◽  
Djamel Ghernaout ◽  
Ramzi Hadj Lajimi ◽  
Ali M. Alshahrani ◽  
...  

Author(s):  
Pei-Wen Huang ◽  
Zhao-Wu Zeng ◽  
Wei Zheng ◽  
Hao Wang ◽  
Xiao-Hong Wei ◽  
...  

2018 ◽  
Vol 182 ◽  
pp. 225-234 ◽  
Author(s):  
Xiaoli Liu ◽  
Wenshui Xia ◽  
Qixing Jiang ◽  
Peipei Yu ◽  
Lin Yue

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