【摘要】：采用氯化鐵對(duì)殼聚糖進(jìn)行改性,制成鐵負(fù)載殼聚糖顆粒(Fe-CTS)去除污染水中的氟化物�？疾炝朔磻�(yīng)時(shí)間、F-初始含量、溫度、p H、共存離子等因素對(duì)Fe-CTS吸附除氟效果的影響,并采用準(zhǔn)2級(jí)動(dòng)力學(xué)模型、Langmuir和Freundlich吸附等溫模型對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行擬合。結(jié)果表明,Fe-CTS吸附除氟過(guò)程受溫度,p H影響較小;共存離子中CO32-對(duì)吸附過(guò)程影響最顯著。實(shí)驗(yàn)數(shù)據(jù)與準(zhǔn)2級(jí)動(dòng)力學(xué)模型擬合程度較高,說(shuō)明吸附過(guò)程中化學(xué)吸附為速率控制步驟。吸附過(guò)程更符合Langmuir吸附等溫模型,說(shuō)明Fe-CTS吸附劑表面呈均質(zhì)性,表面上各吸附位點(diǎn)對(duì)F-的吸附能力相同,當(dāng)吸附劑表面達(dá)到吸附飽和時(shí)吸附平衡,吸附質(zhì)分子間無(wú)相互作用,且吸附過(guò)程以單層吸附為主。
[Abstract]:Iron loaded chitosan particles (Fe-CTS) were prepared by modifying chitosan with ferric chloride to remove fluoride from polluted water. The effects of reaction time, initial F- content and coexisting ions of, p H, on the adsorption and defluorination of Fe-CTS were investigated. The experimental data were fitted by quasi 2 order kinetic model, Langmuir and Freundlich adsorption isotherm model. The results showed that the adsorption and defluorination process of Fe-CTS was less affected by temperature, p H, and that of coexisting ions CO32- had the most significant effect on the adsorption process. The experimental data fit well with the quasi 2 order kinetic model, which indicates that chemisorption is the rate control step in the adsorption process. The adsorption process is more in line with the Langmuir adsorption isotherm model, which indicates that the surface of Fe-CTS adsorbent is homogeneous, and the adsorption ability of all adsorption sites on the surface is the same. When the adsorbent surface reaches adsorption saturation, the adsorption equilibrium is obtained. There is no interaction between adsorbate molecules, and the adsorption process is mainly monolayer adsorption.
【作者單位】： 中國(guó)地質(zhì)大學(xué)(北京)水資源與環(huán)境學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(21407129)
【分類號(hào)】：O647.3;R123.6

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