赣江泥沙对Cu^(2+)的吸附作用研究

Study on the Cu^(2+)-Absorption of Sediments in Ganjiang-River

对赣江泥沙筛分后,采用静态吸附法研究了粒径<0.075 mm和0.075~0.154 mm两种粒级的表层泥沙沉积物对Cu2+的吸附特征和影响吸附的因素。结果表明,吸附达到平衡的时间为2 h,粒径越小吸附量越大,粒径<0.075 mm和粒径为0.075~0.154 mm的泥沙沉积物对Cu2+的吸附量依次为169.28 mg/kg和155.05 mg/kg,其吸附百分率依次为84.64%、77.52%;泥沙与Cu2+进行的是阳离子交换反应,且pH值是影响泥沙吸附Cu2+的一个重要因素。

The Cu2＋-absorption of sediments in Ganjiang-River and the influence factors were studied in this paper by static adsorption method.The sediments were screened out according to size into two gradational granularities： 0.075 mm and 0.075~0.154 mm.The results showed that the time for adsorption equilibrium was 2 h.The smaller the granularity is,the bigger the adsorption capacities is： when the particle size was less than 0.075 mm or between 0.075 and 0.154 mm,their adsorption capacity were followed by 169.28 mg/kg and 155.05mg/kg,and the adsorption percentages were 84.64% and 77.52% respectively.The cation exchange took place between the sediments and Cu2＋.pH value was a primary effective factor influencing the adsorption property of sediments on Cu2＋.