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摘要: 采用离子交换法制备硝酸根型层状双金属氢氧化物(MgAl-NO3-LDH),研究其对水中微量As(Ⅲ)、As(V)和F-的吸附行为;同时使用酸盐法对吸附砷、氟后的材料进行脱附,检测其脱附后的再吸附性能。结果表明:MgAl-NO3-LDH对As(Ⅲ)、As(Ⅴ)和F-的吸附容量分别为0.026、0.11和3.8 mg/g;MgAl-NO3-LDH吸附砷与氟的主导机理均为离子交换;再生后材料对As(Ⅲ)的吸附容量(0.014 mg/g)有所减弱,但对As(Ⅴ)的吸附容量(0.099 mg/g)依然较强。
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关键词:
- MgAl-NO3-LDH /
- 砷 /
- 氟 /
- 吸附 /
- 脱附
Abstract: NO3-type layered double hydroxide (MgAl-NO3-LDH) was prepared via an ion exchange method, and its adsorption capacity toward As(Ⅲ), As(Ⅴ) and F- with trace amount in water was investigated. The materials after the adsorption were desorbed using acid-salt method and the adsorption capacity was further tested. The results showed that the adsorption capacity toward As(Ⅲ),As(Ⅴ) and F- was 0.026, 0.11 and 3.8 mg/g-LDH, respectively, and the main adsorption mechanisms of MgAl-NO3-LDH were the ion exchange. After regeneration the uptake amount toward As(Ⅲ) was found to be reduced to 0.014 mg/g-LDH, but that toward As(Ⅴ) was still high (0.099 mg/g-LDH).-
Key words:
- MgAl-NO3-LDH /
- arsenic /
- fluorine /
- adsorption /
- desorption
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