期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 26, 页码 22776-22785出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b01557
关键词
porous composite film; magnesium silicate; adsorption behavior; heavy metal ions; adsorption-filtration
资金
- National Key R&D Program of China [2016YFB0301600]
- Natural Science Foundation of China
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1205]
It is of great and increasing interest to explore porous adsorption films to reduce heavy metal ions in aqueous solution. Here, we for the first time fabricated carbon paper@magnesium silicate (CP@MS) composite films for the high-efficiency removal of Zn2+ and Cu2+ by a solid-phase transformation from hydromagnesite-coated CP (CP@ MCH) precursor film in a hydrothermal route and detailedly examined adsorption process for Zn2+ and Cu2+ as well as the adsorption mechanism. The suitable initial pH range is beyond 4.0 for the adsorption of the CP@MS to remove Zn2+ under the investigated conditions, and the adsorption capacity is mainly up to the pore size of the porous film. The composite film exhibits excellent adsorption capacity for both of Zn2+ and Cu2+ with the corresponding maximum adsorption quantity of 198.0 mg g(-1) for Zn2+ and 113.5 mg g(-1) for Cu2+, which are advantageous over most of those reported in the literature. Furthermore, the adsorption behavior of the CP@MS film follows the pseudo-second-order kinetic model and the Langmuir adsorption equation for Zn2+ with the cation-exchange mechanism. Particularly, the CP@MS film shows promising practical applications for the removal of heavy metal ions in water by an adsorption-filtration system.
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