Materials of conferences and seminars

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Browsing Materials of conferences and seminars by Subject "activated carbon"

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    The Effect of Chemical Activating Agents on the Morphology and Structure of Bio-Derived Activated Carbon
    (The 8th International Conference on Nanomaterials and Advanced Energy Storage Systems; Nazarbayev University; National Laboratory Astana; Institute of Batteries, 2020-08) Issatayev, Nurbolat; Nurpeissova, Arailym; Kalimuldina, Gulnur; Bakenov, Zhumabay
    Recently, activated carbon (AC) has attracted more and more attention since it exhibits various properties, including operated pore size and morphology, strong mechanical and physico-chemical stability, good absorption capacity and crucially important, large surface area. This makes it an ideal material for use in energy storage, metal recovery, air purification, medical wastewater treatment, water purification, gas storage, and removal of caffeine. In this study, ACs were fabricated by single-stage carbonization and activation of a carbon precursor with four different chemical activating agents such as potassium hydroxide (KOH), zinc chloride (ZnCl2), phosphoric acid (H3PO4) and sulfuric acid (H2SO4), respectively. Agar-agar was used as a bio-derived carbon precursor due to its high carbon content and the lack of any traces of heavy metals. The effect of the activating agents and the weight ratio of activating reagents / precursor as well as the nature of the precursor have been examined and discussed. The morphological and textural properties of ACs were investigated using an electron scanning microscope (SEM), X-ray diffraction (XRD), Raman and FTIR techniques.
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    Preparation of high performance micro- and mesoporous carbon-based sorbents from rice husk and walnut shell
    (The 6th International Conference on Nanomaterials and Advanced Energy Storage Systems. Institute of Batteries LLP, Nazarbayev University, and PI “National Laboratory Astana”., 2018-08-08) Yeleuov, Muhktar; Smagulova, Gaukhar; Supiyeva, Zhazira; Mansurov, Zulkhair
    Activated carbon (AC) is a porous substance that is obtained from various carbonaceous materials of organic origin: charcoal, coal coke, rice husk, walnut shell and other materials. AC has a huge number of pores and is characterized by a large surface area per unit mass, as a result of which it has a high adsorption capacity....
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    Removal of low and middle molecular weight toxins by activated carbon materials
    (National Laboratory Astana, NAZARBAYEV UNIVERSITY, 2016-05) Akhmetova, A.; Howell, C.; Jandosov, J.; Baimenov, A.; Mansurov, Z.; Nurgozhin, T.; Mikhalovsky, S.
    Haemoperfusion (HP), or blood purification via adsorption, has been introduced almost at the same time as haemodialysis in 1960s. HP compared to dialysis does not introduce any substances into the body and only removes the target molecules. Here, we research properties of activated carbon (AC) materials for HP purposes, which can efficiently adsorb substances in a broad range of molecular weights. Removing these substances individually, e.g., by selective antibodies is prohibitively expensive and inefficient due to their short life-time in blood circulation. And, dialysis and ultrafiltration are unable to remove these low and middle molecular weight (LMW, MMW) substances efficiently. Here, we assess adsorption of uremic toxins: p-cresyl sulfate, indoxyl sulfate, and urea.