Preparation of Coal-Based Activated Carbon and its Application for Methylene Blue Removal

Abstract

In accordance with an orthogonal experiment design, a series of ACs for methylene blue (MB) removal had been prepared in the presence of small amounts of KOH in raw material combined with delicate acid washing after carbonization and before steam activation. ACs were characterized, and their adsorption capacities for MB were determined as well. It was found that it was feasible to regulate and optimize pore structure in coal-based ACs by tuning preparation conditions concisely and properly, and the MB adsorption capacities were linearly correlated with their specific surface areas. Based on statistic analysis, it was revealed that among the four process variables studied for the sorbent prepared in this work, the activation temperature was found to be the most significant one for the MB adsorption capacity, the next ones were the activation time, the flow rate of water vapor and the amount of KOH, and an optimized preparation condition was figured out.

Adsorptive removal of methylene blue dye from soapnut shell & pineapple waste derived activated carbon

“…Among the many reagents proposed for chemical activation zinc chloride (ZnCl 2 ), phosphoric acid (H 3 PO 4 ), aluminum chloride, magnesium chloride, potassium hydroxide (KOH), sodium hydroxide (NaOH) etc. out of which ZnCl 2 , H 3 PO 4 , and KOH, are the most commonly used (Gong, Xie, Yang, & Yao, 2013;Kumar, Ramalingam, & Sathish kumar, 2011;Pathania, Sharma, & Singh, 2017). This research aims to investigate and analyze adsorption efficiency of activated carbon prepared by using soapnut shells and pineapple waste for removal of methylene blue dyes from aqueous solution.…”