期刊
ACS APPLIED NANO MATERIALS
卷 3, 期 1, 页码 468-478出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b02052
关键词
heavy-metal scavenging; mesoporous nanocarbon; adsorption efficiency; chemisorption; water remediation
资金
- Ministry of Human Resources Development (MHRD India)
- Council of Scientific and Industry Research (CSIR India)
- Department of Science and Technology-Nano mission program [SR/NM/TP-56/2012]
Anthropogenically triggered escalating contamination of water by heavy-metal ions (As3+, Cr6+, Cd2+, and Hg2+) demands newer and efficient types of adsorbents for their comprehensive scavenging. The wide pH range (pH 2-13) at which such contamination persists makes it challenging to realize a single-step remediation approach. Addressing these escalating demands, a singular adsorbent capable of capturing multiple heavy metal ions with high adsorption capacity across a wide range of pH is herewith reported for sustainable water remediation. Three-dimensional dendritic mesoporous nanostructured carbon florets (NCFs) with high specific surface area (936 m(2)/g) and easily accessible open-ended pore structure (1.23 cm(3)/g) achieve highly efficient removal of multiple heavy metal ions (As3+, Cr6+, Cd2+, and Hg2+). The hydrophilic surface of NCF ensures extensive and efficient interfacing with the water feedstock, while its chemical stability ensures its effectiveness as an adsorbent over a wide pH range (pH 2 to pH 13). The synergistic combination of these factors enables excellent adsorption efficiency (AE; ranging from 80% to 90%) and uniformly high adsorption capacity (q(e)) toward a variety of heavy-metal ions such as Hg2+ (395 +/- 4 mg/g), Cd2+ (402 +/- 5 mg/g), Cr6+ (436 +/- 3 mg/g), and As3+ (412 +/- 4 mg/g). Moreover, the gravity-driven purification of water does not demand any external source of electrical power and is scalable for on-site implementation. Facile regeneration of the NCF and its reusability over multiple cycles is also demonstrated for practical and sustainable application in water remediation.
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