Effect of K+-modified biochar on the adsorption performance of methylene blue

Using corn stalks as raw materials, modified corn stalk biochar (hereafter referred to as biochar) was prepared by phosphoric acid (H3PO4) activation modification, potassium hydroxide (KOH) loading K+ modification and carbonization. The structure of the biochar was characterized using SEM, BET, XRD,...

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Published inMéitàn xuébào Vol. 48; no. 6; pp. 2419 - 2430
Main Authors Zeyu DAI, Jianlin ZHOU, Weiyin LIU, Ping QIN, Zhang CHEN, Zhixian LI, Guoliang CHEN
Format Journal Article
LanguageChinese
Published Editorial Office of Journal of China Coal Society 01.06.2023
Subjects
adsorption model
biochar
diffusion model
k+ modification
methylene blue
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Summary:Using corn stalks as raw materials, modified corn stalk biochar (hereafter referred to as biochar) was prepared by phosphoric acid (H3PO4) activation modification, potassium hydroxide (KOH) loading K+ modification and carbonization. The structure of the biochar was characterized using SEM, BET, XRD, ICP, XPS, and FT-IR. The prepared biochar was used as adsorbent to determine its adsorption performance on methylene blue (MB) in the simulated wastewater. The results showed that the K+-modified biochar had a columnar lamellar structure with richer pores and contained the oxygen-containing functional groups such as —OH and —COOH on the surface, and the oxygen-containing functional groups showed a trend of specialization after K+ modification. The maximum adsorption capacity was 222.93 mg/g, which was 226.02% and 23.51% higher than that of unmodified biochar (68.38 mg/g) and the phosphoric acid (H3PO4)-activated modified biochar (180.49 mg/g), respectively. The kinetic and isotherm models were consistent with the
ISSN:0253-9993
DOI:10.13225/j.cnki.jccs.BE23.0460