期刊
ACS APPLIED NANO MATERIALS
卷 1, 期 4, 页码 1940-1948出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.8b00389
关键词
arsenic removal; macroporous scaffolds; akaganeite nanoparticles; filters; water treatment
资金
- National Research Foundation under the Ministry of Science and ICT, Republic of Korea [2015R1A2A2A01005548, 20100027955]
- Korea Health Technology R&D Project through the Korea Health Industry Development Institute - Ministry of Health & Welfare, Republic of Korea [HI17C0076]
- National Research Foundation of Korea [2015R1A2A2A01005548] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Separation of arsenic from water is an urgent worldwide issue because of its serious toxic effect on human health and aquatic life. In this study, a filter device composed of three-dimensional (3D) macro porous alginate/akaganeite composite (MAAC) scaffolds is proposed for the convenient separation of arsenic from contaminated water. Akaganeite nanorods with superior arsenic adsorption capability are incorporated and distributed within the macroporous alginate scaffold, without significant aggregation. The micron-sized pores and oxygen functional groups in the MAAC scaffold offer enhanced mass transport of the contaminated water throughout the scaffold without the need for input of any force and allow easy contact of arsenic with the active adsorption sites of the scaffold. The high mechanical strength of the MAAC facilitates structural stability of the materials in aqueous solutions. Moreover, the scaffold is capable of excellent arsenic adsorption and can reduce the concentration of arsenic in contaminated water to the acceptable drinking-water level (10 mu g L-1). We also demonstrate that a column filter device constructed by stacking several MAAC scaffolds enables a continuous supply of drinking water with a permissible limit of arsenic according to the World Health Organization in a high-purification speed (similar to 22-25 mL min(-1) under gravity), which could potentially provide an appropriate technology to obtain arsenic-free drinking water in developing countries.
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