期刊
PLOS ONE
卷 11, 期 2, 页码 -出版社
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0148132
关键词
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资金
- China Geological Survey [1212010914020]
- National Natural Science Foundation of China [41001341]
- Fundamental Research Funds for the Central Universities [2014ZZ0012]
- National Natural Science Foundation of China (NSFC)
- Fundamental Research Funds for the Central Universities (FRFC)
- Ministry of Education
- South China University of Technology
- Guangdong Province [2012B091100143, 2013B090500022]
- China Ministry of education [2012B091100143, 2013B090500022]
- Science and Technology Planning Project of Dongguan City [2014108101042]
- Baibuti Project of SCUT [DA20315001]
- Student Research Project of SCUT [105612015S586]
The study investigated the preparation and characterization of biochars from water hyacinth at 300 degrees C to 700 degrees C for cadmium (Cd) removal from aqueous solutions. The adsorption process was dominated by oxygen-containing functional groups with irregular surfaces via esterification reactions. Furthermore, the mineral components in the biochars also contributed to Cd absorption through precipitation. Parameters such as the effects of solution pH, contact time, and initial concentration were studied. The optimum pH value was observed at 5.0, in which nearly 90% of Cd was removed. The maximum Cd adsorption capacities based on the Langmuir isotherm were calculated at 49.837, 36.899, and 25.826 mg g(-1). The adsorption processes of the biochars followed the pseudo-second-order kinetics, with the equilibrium achieved around 5 h. The biochar from E. crassipes is a promising adsorbent for the treatment of wastewater, which can in turn convert one environmental problem to a new cleaning Technology.
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