期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 323, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.molliq.2020.115071
关键词
Efficient nitrogen/phosphorus modification; Guanidine phosphate activator; Enhanced porosity; Heavy metal passivation; Mineralization
资金
- National Natural Science Foundation of China [21875257]
- program of Chongqing University of Arts and Sciences [P2018CL09]
- CAS Pioneer Hundred Talents Program
Bamboo sawdust activated by guanidine phosphate (GP) was used to prepare nitrogen/phosphorus enriched biochars with enhanced porosity, showing high sorption capacities for heavy metals and efficient immobilization from contaminated water. The activation of biomass residuals could be an efficient approach to functionalize the surface of biochars.
Nitrogen/phosphorus enriched biochars with enhanced porosity were prepared through a one-step pyrolysis of bamboo sawdust activated by guanidine phosphate (GP). The thermal decomposition of GP released alkaline gas and hydrogen proton to create more micropores in biochar matrix which were extended to be mesopores further. Nitrogenous/phosphorous moieties of GP were introduced into biochars efficiently via cross-linking with the carbon skeleton. GP-activated biochar pyrolyzed at 450 degrees C exhibited enriched surface functional groups (113 at.% for N. 4.1 at.% for P), resulting in high sorption capacities for aquatic Pb(II) (1662 mg/g), Cu(II) (81.7 mg/g), and Cd (II) (60.3 mg/g). Pb(II) was passivated fast with the formation of minerals including Pb-5 (PO4)(3)OH and Pb-5(PO4)(3)Cl. Cu(II) was strongly coordinated with the N-containing species especially pyridinic N. Cd(II) was also captured efficiently due to the chemical complexation, cation exchange and cation-pi bonds. GP-activated biochars could be well-recycling used to capture these heavy metals. Regarding these, the activation of biomass residuals could be an efficient approach to functionalize the surface of biochars with enhanced porosity, which is great benefiting for the immobilization of heavy metals from contaminated water. (C) 2020 Elsevier B.V. All rights reserved.
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