Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 27, Issue 15, Pages 18866-18874Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-08455-3
Keywords
N-doped biochar; Waste; Hydrothermal carbonization; Structural analysis; Heavy metal adsorption; Mechanism
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Funding
- National Natural Science Foundation of China [31700612]
- Natural Science Foundation of Shaanxi Province [2019JQ-082]
- Technical System for Tea Industry of Shaanxi Province
- Xianyang Science and Technology Plan Project [2019k01-52]
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N-doped biochar as adsorption material for heavy metal removal has attracted increasing concern in environmental application due to its unique features. Here, N-doped biochar was prepared by hydrothermal carbonization of Camellia sinensis branch waste using KOH/NH4Cl at 120-280 degrees C for 2 h under 0.4-6.5 MPa, followed by structural analysis. The results showed that the highest N content determined by elemental analysis could reach up to 6.18% in biochar, and the major N species were involved in graphitic N, pyrrolic N, and pyridinic N. Interestingly, these N-doped biochar exhibited the effective adsorption ability of Cu2+, Pb2+, Zn2+, and Cr6+. The batch adsorption behavior had a better adjustment to the pseudo-second-order kinetic and the Langmuir adsorption isotherm models. In brief, the present results are attributed to develop low-cost adsorbent for removing heavy metal ions.
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