炭化米糠经臭氧活化制备活性炭及其去除Cr(VI)离子

Sivaraju Sugashini; Kadhar Mohamed Meera Sheriffa Begum

doi:10.1016/S1872-5805(15)60190-1

炭化米糠经臭氧活化制备活性炭及其去除Cr(VI)离子

doi: 10.1016/S1872-5805(15)60190-1

Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli 620015, Tamilnadu, India

详细信息

作者简介:
Sivaraju Sugashini. E-mail: suga.chemical@gmail.com|meera@nitt.edu

通讯作者:
Kadhar Mohamed Meera Sheriffa Begum. E-mail: meerasheriffa@gmail.com

中图分类号: TQ127.1⁺1
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- 被引次数: 0
出版历程
- 收稿日期: 2015-02-08
- 录用日期: 2015-09-07
- 修回日期: 2015-05-21
- 刊出日期: 2015-06-28

Preparation of activated carbon from carbonized rice husk by ozone activation for Cr(VI) removal

Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli 620015, Tamilnadu, India

摘要

摘要: 以臭氧为活化剂,炭化的米糠为原料制备出活性炭。采用氮吸附、SEM-EDAX 和FT-IR对样品进行表征。活性炭的比表面积由活化前的20 m²/g增加到380 m²/g。在臭氧活化过程中,吸附在炭材料上的二氧化硅变疏松,从而导致碳逸出。臭氧同时以氧分子和原子形式存在于炭表面。氧原子,作为强氧化剂,将炭表面氧化成酸性官能团如羧基、酮基和酚基。采用该活性炭吸附Cr (VI) 离子,Cr (VI) 离子的最大去除率(94%)的条件为:pH值2.0、浓度100 mg/L、吸附量0.2 g,时间2.5 h及转速300 r/min。采用吸附平衡和动力学模型探讨吸附机理,结果表明,吸附等温线符合Freundlich方程,吸附速率符合准二级动力学方程。吸附是自发的放热反应,可能与NaOH脱落而恢复Cr和碳有关。
- 米糠 /
- 活性炭 /
- 臭氧处理 /
- Cr (VI)离子 /
- 动力学 /
- 传质
Abstract: Activated carbon (AC) was prepared from carbonized rice husks using ozone as an activating agent. The AC was characterized by nitrogen adsorption, SEM-EDAX and FT-IR. The Brunauer-Emmett-Teller surface area of the carbons was increased from 20 to 380 m²/g by the activation. It was observed that the silica attached to the carbonaceous material is loosened, leading to a release of carbon during the ozone activation. Ozone exists as both molecular and atomic oxygen on the surface of carbon. Atomic oxygen, as a powerful oxidizing agent, oxidizes the carbon surface into acidic functional groups such as carboxylic, ketonic and phenolic. The rice husk AC was used for the adsorption of Cr (VI) ions. A maximum removal percentage (94%) of Cr (VI) ions was obtained for a 100 mg/L aqueous solution at the optimized conditions of pH value of 2.0, adsorbent dosage of 0.2 g, time of 2.5 h and stirring speed of 300 r/min. Adsorption equilibrium and kinetic models were used to investigate the adsorption mechanism. It was found that the adsorption isotherms were well fitted by the Freundlich equation. The adsorption rate follows pseudo second order kinetics and the adsorption is spontaneous and exothermic. It is possible to recover Cr and carbon by NaOH stripping.
- Rice husk /
- Activated carbon /
- Ozone treatment /
- Cr (VI) ions /
- Kinetics /
- Mass transfer

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参考文献(28)

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