Methylene blue adsorption mechanism of activated carbon synthesised from cashew nut shells

活性炭 吸附 亚甲蓝 化学 化学工程 原材料 腰果 制浆造纸工业 碳纤维 废物管理 有机化学 材料科学 复合材料 食品科学 催化作用 光催化 工程类 复合数
作者
Hoc Thang Nguyen,Dinh Sy Khang,Tran Duy Hai,Dinh Thi Thuy Nga,Phan Đình Tuấn
出处
期刊:RSC Advances [Royal Society of Chemistry]
卷期号:11 (43): 26563-26570 被引量:66
标识
DOI:10.1039/d1ra04672a
摘要

Activated carbon produced from agricultural products and wastes has been applied widely to remove pollutants in the field of waste water treatment. However, the cost of this adsorbent depends so much on the raw material sources. Therefore, the approach of producing activated carbon from agricultural waste is strongly recommended due to economic advantages and environmental protection. One of the potential feed-stocks for the activated carbon production is cashew nut shell (CNS) waste which could reduce the negative impacts to the environment from the cashew nut processing industry and simultaneously enhance the values of the related products. This study focused on evaluating the influences of variable factors, such as activation temperature and time, on the properties of the activated carbon obtained from CNS. Methylene blue (MB) adsorption was applied to understand the adsorption mechanism of the products. The results show that increasing the activation temperature led to a rise in the adsorption capacity of the activated carbon within the temperature range of 800 to 850 °C. Otherwise, the values were reduced when the temperature was greater than 850 °C and this was related to the thermal decomposition of carbon. The adsorption capacity also increased when the activation time was changed from 30 min to 50 min. However, in the activation time range from 50 to 70 min, there was a reduction of the adsorption capacity of CNS-based activated carbon. The results also show that the MB adsorption of the activated carbon occurred with one-site-occupancy in the first layer and then layer-by-layer adsorption formation.
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