Co-production of biochar and carbon nanotube from sewage sludge in a two-stage process coupling pyrolysis and catalytic chemical vapor deposition  

作　　者：Mohd Syazwan Mohd Ghazali Mohd Saufi Md Zaini Muhammad Arshad Syed Shatir A.Syed-Hassan 

机构地区：[1]School of Chemical Engineering,College of Engineering,Universiti Teknologi MARA,40450,Shah Alam,Selangor,Malaysia [2]Section of Environmental Engineering,Universiti Kuala Lumpur,Malaysia Institute of Chemical and Bioengineering,78000,Alor Gajah,Melaka,Malaysia [3]Chemical Engineering Studies,College of Engineering,Universiti Teknologi MARA Cawangan Terengganu,Kampus Bukit Besi,23200,Dungun,Terengganu,Malaysia [4]Department of Basic Science,Jhang-Campus University of Veterinary and Animal Science,Lahore,Pakistan

出　　处：《Waste Disposal and Sustainable Energy》2024年第3期323-334,共12页废弃物处置与可持续能源（英文）

基　　金：supported by the Ministry of Higher Education of Malaysia(MOHE)via Fundamental Research Grant Scheme(No.FRGS/1/2022/TK0/UITM/02/82).

摘　　要：This study explores the potential of valorizing sewage sludge as a carbon source for the co-production of biochar and carbon nanomaterial via a two-stage thermal-catalytic process.In the first stage,sewage sludge underwent slow pyrolysis,resulting in a biochar yield of 66%(in weight)at 550°C.The resulting pyrolysis vapor was then introduced into a second reactor,where catalytic chemical vapor deposition(CCVD)took place in the presence of a cobalt catalyst,leading to the production of carbon nanotubes(CNTs).It was found that CNTs with an inner diameter of~3.2 nm and an outer diameter of 20-40 nm can be formed in the second stage reactor at temperatures between 650℃ and 950℃ with a maximum yield of 30%(in weight)under the employed experimental conditions.The obtained CNTs displayed a multiwall structure,exhibited a lack of crystallinity,and demonstrated a high level of disorder.The research findings also indicate that temperature exerts a significant influence on both the yield and properties of the CNTs synthesized.

关 键 词：Sewage sludge PYROLYSIS CCVD Carbon nanotube BIOCHAR 

分 类 号：X703[环境科学与工程—环境工程]