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.
Liu
Chen
C
College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
Tang
Zhengguang
Z
Chen
Yao
Y
Su
Shijun
S
Jiang
Wenju
W
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