Characterization of mesoporous activated carbons prepared by pyrolysis of sewage sludge with pyrolusite.
Activated carbons were prepared from sewage sludge by chemical activation. Pyrolusite was added as a catalyst during activation and carbonization. The influence of the mineral addition on the properties of the activated carbons produced was evaluated. The results show that activated carbons from pyrolusite-supplemented sewage sludge had up to a 75% higher BET surface area and up to a 66% increase in mesoporosity over ordinary sludge-based activated carbons. Batch adsorption experiments applying the prepared adsorbents to synthetic dye wastewater treatment yielded adsorption data well fitted to the Langmuir isotherm. The adsorbents from pyrolusite-supplemented sludges performed better in dye removal than those without mineral addition, with the carbon from pyrolusite-augmented sludge T2 presenting a significant increase in maximum adsorption capacity of 50mg/g. The properties of the adsorbents were improved during pyrolusite-catalyzed pyrolysis via enhancement of mesopore production, thus the mesopore channels may provide fast mass transfer for large molecules like dyes.
College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
Chen
C
Liu
Zhengguang
Z
Tang
Yao
Y
Chen
Shijun
S
Su
Wenju
W
Jiang
D000327:Adsorption; D002244:Carbon / Q000737:chemistry; D002606:Charcoal / Q000737:chemistry*; D004396:Coloring Agents / Q000302:isolation & purification; D004305:Dose-Response Relationship, Drug; D007220:Industrial Waste; D017895:Manganese Compounds / Q000737:chemistry*; D008962:Models, Theoretical; D009584:Nitrogen / Q000737:chemistry; D010087:Oxides / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods
D004396:Coloring Agents; D007220:Industrial Waste; D017895:Manganese Compounds; D010087:Oxides; D012722:Sewage; D002606:Charcoal; D002244:Carbon; D009584:Nitrogen; C016552:manganese dioxide