朝陽某鈣基膨潤土有機(jī)改性及吸附性能研究
發(fā)布時(shí)間：2019-02-15 19:03
【摘要】：以朝陽某天然鈣基膨潤土為原料,以十二烷基三甲基溴化銨為改性劑,通過超聲輔助法制備有機(jī)改性膨潤土,利用X射線衍射分析(XRD)、紅外吸收光譜(FTIR)、比表面積(BET)和zeta電位等技術(shù)手段對(duì)改性膨潤土進(jìn)行表征,研究改性膨潤土對(duì)甲基橙和苯酚的吸附性能,考察反應(yīng)時(shí)間、污染物初始質(zhì)量濃度及pH值對(duì)吸附效果的影響規(guī)律。結(jié)果表明,改性劑成功插入鈣基膨潤土層間,致其層間距增大,zeta電位升高;改性膨潤土對(duì)甲基橙和苯酚的吸附行為均符合準(zhǔn)二級(jí)動(dòng)力學(xué)和Langmuir等溫吸附模型,飽和吸附量分別為197.63 mg/g和10.34 mg/g,吸附機(jī)理以物理吸附和電荷吸附為主。
[Abstract]:Organic modified bentonite was prepared from a natural calcium bentonite in Chaoyang by ultrasonic assisted method with dodecyl trimethylammonium bromide as modifier. (XRD), infrared absorption spectrum (FTIR), was analyzed by X-ray diffraction. The surface area of modified bentonite was characterized by (BET) and zeta potential. The adsorption properties of modified bentonite for methyl orange and phenol were studied. The effects of reaction time, initial concentration of pollutants and pH value on the adsorption were investigated. The results showed that the interlayer of calcium bentonite was successfully inserted into the modifier, which led to the increase of the interlayer spacing and the increase of zeta potential. The adsorption behavior of modified bentonite for methyl orange and phenol was in accordance with the quasi-second-order kinetics and Langmuir isothermal adsorption model. The saturated adsorption amounts of 197.63 mg/g and 10.34 mg/g, were mainly physical adsorption and charge adsorption.
【作者單位】： 中國礦業(yè)大學(xué)(北京)化學(xué)與環(huán)境工程學(xué)院;
【基金】：國家自然科學(xué)基金(51504263) 中央高�；究蒲袠I(yè)務(wù)費(fèi)資助項(xiàng)目(2015QH01)
【分類號(hào)】：O647.3;X703
本文編號(hào)：2423638
[Abstract]:Organic modified bentonite was prepared from a natural calcium bentonite in Chaoyang by ultrasonic assisted method with dodecyl trimethylammonium bromide as modifier. (XRD), infrared absorption spectrum (FTIR), was analyzed by X-ray diffraction. The surface area of modified bentonite was characterized by (BET) and zeta potential. The adsorption properties of modified bentonite for methyl orange and phenol were studied. The effects of reaction time, initial concentration of pollutants and pH value on the adsorption were investigated. The results showed that the interlayer of calcium bentonite was successfully inserted into the modifier, which led to the increase of the interlayer spacing and the increase of zeta potential. The adsorption behavior of modified bentonite for methyl orange and phenol was in accordance with the quasi-second-order kinetics and Langmuir isothermal adsorption model. The saturated adsorption amounts of 197.63 mg/g and 10.34 mg/g, were mainly physical adsorption and charge adsorption.
【作者單位】： 中國礦業(yè)大學(xué)(北京)化學(xué)與環(huán)境工程學(xué)院;
【基金】：國家自然科學(xué)基金(51504263) 中央高�；究蒲袠I(yè)務(wù)費(fèi)資助項(xiàng)目(2015QH01)
【分類號(hào)】：O647.3;X703
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