期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 22, 页码 19816-19824出版社
AMER CHEMICAL SOC
DOI: 10.1021/am505170j
关键词
Cr(VI) removal; polyethylenimine (PEI); ethyl cellulose (EC); adsorption; kinetics; redox reaction
资金
- Texas Hazardous Waste Research Center (THWRC)
- National Science Foundation-Chemical and Biological Separation under EAGER program [CBET 11-37441, 10-30755, 13-14486]
- China Scholarship Council (CSC)
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1030755] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1314486] Funding Source: National Science Foundation
Ethyl cellulose (EC) composites modified with 20.0 wt % polyethylenimine (PEI) (PEI/ECs) demonstrated effective hexavalent chromium, [Cr(VI)], removal from solutions with a wide pH range. For example, 4.0 mg/L Cr(VI) solution with a pH below 3.0 was completely purified by 3.0 g/L PEI/ECs within 5 min, much faster than the as-received EC (2 h) and activated carbon (several hours). These PEI/ECs adsorbents has overcome the low pH limitation of Cr(VI) removal; for example, 4.0 mg/L Cr(VI) solution with a pH of 11.0 was completely purified within 15 min. These adsorbents followed chemical adsorption as revealed from the pseudo-second-order kinetic study. These PEI/ECs following the isotherm Langmuir model have a maximum adsorption capacity of 36.8 mg/g, much higher than pure EC (12 mg/g), tetrabutylammonium-modified celluloses (16.67 mg/g), and magnetic carbon (16 mg/g). The reduction of Cr(VI) to Cr(III) by the oxidation of amine groups and hydroxyl groups of PEI/ECs was verified as the main mechanism for the Cr(VI) removal.
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