期刊
ACS APPLIED NANO MATERIALS
卷 1, 期 6, 页码 2536-2543出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.8b00103
关键词
block copolymer; nitrogen-doped carbons; adsorption; chromium; uranium
资金
- National Natural Science Foundation of China [51473087, 51673109, U1430234]
- National Science Foundation [DMR 1501324]
- Polish Ministry of Science and Higher Education (Mobilnosc Plus) [1055/MOB/2013/0]
- Office of Science, Office of Basic Energy Sciences under U.S. Department of Energy at Lawrence Berkeley National Laboratory [DE-AC02-05CH11231]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1501324] Funding Source: National Science Foundation
Polyacrylonitrile (PAN) homopolymer and polyacrylonitrileblock-poly(n-butyl acrylate) (PAN-b-PBA) block copolymer were synthesized via supplemental activator reducing agent atom transfer radical polymerization and used as precursors to nitrogen-doped nanocarbons. Carbonization was performed at two different temperatures (500 and 800 degrees C) to fabricate nanocarbons with different structural properties and nitrogen contents. Copolymer-templated nitrogen-doped carbons (CTNCs) had larger surface area and higher mesoporosity than PAN homopolymer-templated nano carbons (PANCs), due to the presence of PBA block acting as a sacrificial porogen. Adsorption performances of PANCs and CTNCs for Cr(VI) and U(V1) species were systematically studied. Due to the well-defined structure and larger surface area, CTNCs showed stronger adsorption ability than PANCs. The nitrogen atoms incorporated into the carbon framework led to higher electrostatic attraction for Cr(VI) anions at low pH and complexation with U(VI) cations at high pH. Theoretical maximum adsorption capacities of CTNC-500 on Cr(VI) and U(VI) were 333.3 mg/ g (pH = 2) and 17.2 mg/g (pH= 5), respectively. CTNCs also showed preferential adsorption for U(VI) compared to other ions, which might be explained by the hard and soft acids and bases theory. Thus, the copolymer-templated nitrogen-doped mesoporous carbons developed in this study represent a new class of nanocarbon sorbents with potential for removing heavy metal contaminants in either cationic or anionic form from aqueous media and thus mitigating environmental pollution.
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