Synthesis of ferromagnetic ordered mesoporous carbons for bulky dye molecules adsorption

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• 作者：Yan Dong ; Huiming Lin ; Fengyu Qu ; ^{qufengyuchem@yahoo.com.cn}
• 关键词：Mesoporous carbon ; Ferromagnetic ; Chemical activation ; Langmuir adsorption ; Dye
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 出版时间：15 June, 2012
• 年：2012
• 卷：193-194
• 期：Complete
• 页码：169-177
• 全文大小：856 K

文摘

The magnetic mesoporous carbon materials have been synthesized by chemical activation followed by reduction of Fe(NO₃)₃ under N₂ condition. All these materials possess dual-pore mesopore texture (2.8-2.9 nm and 3.5-4.1 nm), large surface areas (975-1321 m²/g), and high pore volumes (0.85-1.08 cm³/g). The adsorption capability and behavior of four dyes, methylthionine chloride (MC), methyl orange (MO), rhodamine B (RB), and gongo red (GR), were carried out on these magnetic bimodal mesoporous carbon materials. All the materials show the well adsorption capacity of the four dyes (highest reach 768 mg/g). After investigating the adsorption isotherms of these dyes, they all fit the typical Langmuir adsorption model. And the adsorption amount is mainly affected by BET surface area and the structure/size matching between adsorbent and adsorbate. With the highest BET surface area and 1D short mesopore structure, the sample shows the larger adsorbing capacity for the smaller molecular dyes (MC, MO). Moreover, the 1D long mesopore is benefit to absorb the dye with 1D long chain structural molecule (GR), while the storage capacity of RB (2D molecular structure) on 1D mesoporous adsorbent is the lowest.