Journal
ARABIAN JOURNAL OF CHEMISTRY
Volume 13, Issue 12, Pages 9019-9033Publisher
ELSEVIER
DOI: 10.1016/j.arabjc.2020.10.024
Keywords
Straw; Cellulose; Lignin; Hemicellulose; Adsorption
Categories
Funding
- National Natural Science Foundation of China [21978226]
- Key Project of Chinese Ministry of Education [213024A]
- Program for Excellent Young Scientific and Technological Innovation Team of Hubei Provincial Department of Education, China [T201506]
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Adsorption performance and stability of the carboxyl groups modified straws and their extracts of cellulose, lignin, and hemicellulose for Pb2+ were investigated, and the optimum pH range for Pb2+ adsorption was determined by considering both the stability and capacity of the modified biosorbents for the first time. Results showed that adsorption capacity and stability of the straws and extracts were both improved significantly after modification. Adsorption capacities of the modified straws and extracts followed the order: modified hemicellulose > modified lignin, modified straw > modified cellulose, while stability of them followed the reverse order. In the optimum pH range from 4.0 to 5.0, modified rape and cotton straw showed better stability than the modified maize straw, and total organic carbon (TOC) values determined from the two modified straws and extracts were lower than 5.0 mg L-1 even after adsorption for 30 days, which reached the drinking water standard in China. (C) 2020 The Authors. Published by Elsevier B.V. on behalf of King Saud University.
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