岩土力学
巖土力學
암토역학
ROCK AND SOIL MECHANICS
2013年
8期
2136-2142
,共7页
铬%黄土%重金属污染%吸附
鉻%黃土%重金屬汙染%吸附
락%황토%중금속오염%흡부
chromium%loess soil%heavy metal contamination%adsorption
铬是一种重金属痕量元素，人体通过食物链摄入过量的铬会在人体内富集，随之产生中毒反应。研究 Cr(III)的浓度、反应时间、反应温度、pH 值等因素对 Cr(III)在黄土上吸附特性的影响，结果表明黄土对 Cr(III)的吸附非常迅速，并且吸附量非常大，等温吸附模型 Freundlich 和 Dubinin-Radushkevich(D-R)模型都能很好地解释 Cr(III)在黄土上的吸附过程。热动力学分析表明，吸附是一个自发的过程，升温可促进吸附作用的进行。随着温度的不断升高，Cr(III)的吸附量逐渐增大。溶液的 pH 值是影响 Cr(III)吸附效果的一个重要因素，当 pH>6时，Cr(III)几乎完全被去除。利用 X 光衍射图谱和红外光谱分析，探讨黄土与 Cr(III)的结合机制，黄土中的高岭土、石英等黏土矿物以及有机质成分对吸附过程起重要作用。
鉻是一種重金屬痕量元素，人體通過食物鏈攝入過量的鉻會在人體內富集，隨之產生中毒反應。研究 Cr(III)的濃度、反應時間、反應溫度、pH 值等因素對 Cr(III)在黃土上吸附特性的影響，結果錶明黃土對 Cr(III)的吸附非常迅速，併且吸附量非常大，等溫吸附模型 Freundlich 和 Dubinin-Radushkevich(D-R)模型都能很好地解釋 Cr(III)在黃土上的吸附過程。熱動力學分析錶明，吸附是一箇自髮的過程，升溫可促進吸附作用的進行。隨著溫度的不斷升高，Cr(III)的吸附量逐漸增大。溶液的 pH 值是影響 Cr(III)吸附效果的一箇重要因素，噹 pH>6時，Cr(III)幾乎完全被去除。利用 X 光衍射圖譜和紅外光譜分析，探討黃土與 Cr(III)的結閤機製，黃土中的高嶺土、石英等黏土礦物以及有機質成分對吸附過程起重要作用。
락시일충중금속흔량원소，인체통과식물련섭입과량적락회재인체내부집，수지산생중독반응。연구 Cr(III)적농도、반응시간、반응온도、pH 치등인소대 Cr(III)재황토상흡부특성적영향，결과표명황토대 Cr(III)적흡부비상신속，병차흡부량비상대，등온흡부모형 Freundlich 화 Dubinin-Radushkevich(D-R)모형도능흔호지해석 Cr(III)재황토상적흡부과정。열동역학분석표명，흡부시일개자발적과정，승온가촉진흡부작용적진행。수착온도적불단승고，Cr(III)적흡부량축점증대。용액적 pH 치시영향 Cr(III)흡부효과적일개중요인소，당 pH>6시，Cr(III)궤호완전피거제。이용 X 광연사도보화홍외광보분석，탐토황토여 Cr(III)적결합궤제，황토중적고령토、석영등점토광물이급유궤질성분대흡부과정기중요작용。
Chromium is a trace element and toxic effect will be caused by excessive intake of chromium. Factors including the concentration of Cr(III), reaction time, reaction temperature and pH value were studied to investigate the adsorption behavior of loess soil towards Cr(III). The researches indicated the adsorption speed is very fast; the adsorption capacity of Cr(III) on loess soil is very big; and the adsorption test results can be well interpreted by three isotherm models, i.e. Freundlich and Dubinin-Radushkevich (D-R) models. The thermodynamic analysis indicates that the adsorption process of Cr(III) on loess soil is spontaneous, and higher temperature is benefit to the adsorption process. Higher temperature leads to higher adsorption capacity; higher initial concentration of Cr(III) leads to higher adsorption capacity too; pH value has great influence on the removal efficiency of Cr(III) from aqueous solution, and Cr(III) can be nearly completely removed at pH>6. X-ray diffraction spectra and Fourier transform-infrared spectra were used to further discuss the adsorption mechanism of Cr(III) on loess soil; and the analysis indicates that the clay minerals such as kaolin and quartz and organic matter in loess play important roles in Cr(III) removal.
