摘要
以内蒙古地区五个河段表层沉积物为吸附剂,实验室模拟含氟废水为吸附质,对沉积物对氟的吸附行为进行研究。运用Lagergren准一级、准二级动力学模型及Langmuir、Friendlich等温吸附模型对试验数据进行拟合,结果表明:沉积物对氟的动力学吸附过程与Lagergren准二级动力学方程拟合相关性较好,平衡吸附量范围为1.73~2.02 mg g^-1,最高值出现在乌海;而对氟的热力学吸附过程与Langmuir吸附方程有较好拟合(R^2>0.962),最大吸附量Qmax的范围为1.72~7.40 mg g^-1,平均值为3.89mg g^-1;与Friendlich吸附方程拟合也较好(R^2>0.963),1/n范围为0.8017~0.9855,说明沉积物对氟的吸附过程易于进行。研究发现:洮儿河和岱海吸附量较低且解吸率高,应特别注意其河流水体的氟污染问题。
The adsorption behavior of fluorine in the wastewater by sediments from five rivers of Inner Mongolia was investigated and simulated in lab with Lagergren quasi first-order and second-order kinetic models,and Langmuir and Friendlich isotherm adsorption models.The dynamic adsorption process of fluorine by sediments was well simulated with the Lagergren quasi second-order kinetic equation.The equilibrium adsorption amounts ranged from 1.73 to 2.02 mg g^-1 and the highest was in Wuhai.The thermodynamic adsorption process of fluorine was fit well with the Langmuir adsorption equation(R2>0.962),with the qe max ranges of 1.72-7.40 mg g^-1 and the average amount of 3.89 mg g^-1.It was also well fitted with the Friendlich adsorption equation(R^2>0.963),with 1/n of 0.8017-0.9855,which indicated that fluorine was easy to be adsorbed by sediments.The adsorption capacity in the Tao’er River and Daihai was low and the desorption rate was high.So we should pay a special attention to the fluorine pollution of these rivers.
作者
陈乐
王晓丽
CHEN Le;WANG Xiao-li(Inner Mongolia Key Lab oratory of Environmental Chemistry,Hohhot 010022,China;College of Chemistry and Environmental Sciences,Inner Mongolia Normal University,Hohhot 010022,China)
出处
《土壤通报》
CAS
CSCD
北大核心
2019年第6期1478-1483,共6页
Chinese Journal of Soil Science
基金
国家自然科学基金（41263005）
内蒙古自治区水环境安全协同创新培育中心（XTCX003）资助
关键词
沉积物
氟
吸附/解吸
内蒙古
Sediment
Fluoride
Adsorption/Desorption
Inner Mongolia
