文章编号:1007-8827(2015)04-0310-09
油泥经热化学处理转化成多孔炭材料的可行性
Shohreh Mohammadi,Nourollah Mirghaffari
(Department of Natural Resources,Isfahan University of Technology,Isfahan,Iran)
摘要:研究燃油储罐中产生的油泥转化为多孔炭材料的表征和可行性三油泥含有80%碳,主要以脂肪族化合物形式存在三经600?热处理和KOH存在下的热化学裂解得到2种碳质材料三热化学处理可显著提高所制多孔炭的织构特性,即微孔和介孔结构三该多孔炭表面积二总孔容与微孔比表面积分别为327.95m2四g-1二0.21cm3四g-1和89.10m2四g-1,其在水溶液中对Cd的吸附性能优于商业活性炭三油泥经热化学转化的多孔炭吸附剂能应用于污水处理,是一种转化废弃物的有效途径三
关键词:油泥;多孔炭;热化学处理;吸附
中图分类号:TB332文献标识码:A
通讯作者:Nourollah Mirghaffari.E-mail:mnorolah@cc.iut.ac.ir
A preliminary study of the preparation of porous carbon from oil
sludge for water treatment by simple pyrolysis or KOH activation
Shohreh Mohammadi,Nourollah Mirghaffari
(Department of Natural Resources,Isfahan University of Technology,Isfahan,Iran)
Abstract:The production and disposal of large amounts of oil sludge are considered a most critical environmental issue in the petroleum industry.The possible conversion of oil sludge produced in a fuel oil storage tank to porous carbons by simple pyrolysis or KOH activation was investigated and the feasibility of their use to treat drinking water and to adsorb were evaluated.The oil sludge contains80%of carbon and consists of mainly aliphatic compounds.The porous carbon obtained by KOH activation has a BET sur-face area,total pore volume and micropore surface area of328.0m2四g-1,0.21cm3四g-1and289.10m2四g-1,respectively,while that produced by pyrolysis has a much lower surface area of3.6m2四g-1.Although Cd,Cu,Zn,Mn,and Fe are enriched in the porous carbons compared with the oil sludge,their leaching in distilled water is low and below the allowed standard limits except for Cr which is close to the limit.The Cd adsorption removal rates for the KOH activated porous carbon and the pyrolysed one are 97.36and77.74%,respectively.The former is comparable to three commercial activated carbons under the same conditions.The recovery of the oil sludge through KOH activation to prepare porous adsorbents for waste water treatment can be suggested as an alternative to the conventional disposal methods.
Keywords: Oily sludge;Porous carbon;Thermochemical treatment;Adsorption
Received date:2015-02-20;Revised date:2015-08-01
Corresponding author:Nourollah Mirghaffari.E-mail:mnorolah@cc.iut.ac.ir
English edition available online ScienceDirect(https://www.doczj.com/doc/631753962.html,/science/journal/18725805).
DOI:10.1016/S1872-5805(15)60192-5
1 Introduction
Porous carbonaceous materials are known as powerful adsorbents,owing to their high surface area and adsorptive capacity[1,2].Activated carbons,as one class of them,have been widely utilized in differ-ent applications such as the adsorbent for the removal of pollutants from the gaseous or liquid phases,cata-lysts and catalyst supports[1,3].They can be produced from various carbonaceous precursors including agri-cultural waste[3],petroleum coke[1]and sewage sludge[1,4]by physical and/or chemical proces-ses[1,3].In recent years,particular emphasis has been focused on the production of activated carbons from solid wastes,which are expected to have lower cost than the commercial ones[1].
Oily sludges contain heavy metals,polycyclic aromatic hydrocarbons,and oily compounds.Their production is one of the most important environmental issues in the oil and petrochemical industries[5].An-nually,large quantities of oily sludges(more than 60million tons)are generated in oil-water separators, dissolved air flotation units,heat exchanger clean-ings,and tank bottom cleanings in oil refineries
第30卷第4期
2015年8月新型炭材料
NEW CARBON MATERIALS Vol.30 No.4 Aug.2015