核桃壳对水中Pb^(2+)和Ni^(2+)吸附研究

Walnut Shell Absorption of Pb^(2+) and Ni^(2+) in Aqueous Solution

以1.6~2.5 mm的新疆核桃壳作为吸附剂,研究其对模拟废水中Pb2+和Ni2+的吸附性能。实验表明:25℃,pH值为5.5,吸附剂用量1.2 g时Pb2+的吸附量最大;pH值为6.0,吸附剂用量2.0 g时Ni2+的吸附量最大,Pb2+的吸附容量为Ni2+的3倍。Pb2+,Ni2+竞争及偏好吸附表明,Ni2+的干扰使Pb2+的吸附容量下降14.8%,Pb2+的干扰使Ni2+的吸附容量下降66.5%,吸附剂对Pb2+的选择性更高。

The study explores absorption of Pb2+and Ni2+metallic ions from simulated aqueous solution by wal-nut shell of 1.6-2.5 mm in diameter originated from Xinjiang. The batch procedure shows that the absorption ca-pacity reached the peak for Pb2+when the optimum initial solution pH values was 5.5 and the absorbent dosage was 1.2 g at 25℃;The adsorption capacity reached the peak for Ni2+when the optimum initial solution pH val-ues were 6.0 and the absorbent dosage was 2.0g with the absorption capacity of Pb2+about 3 times of Ni2+. Com-pared with the sole ion absorption results,the competitive absorption made absorption capacity of Pb2+and Ni2+fall about 24.3%and 66.5%respectively. In the competitive and preference absorption test,the absorption pref-erence for Pb2+ was remarkable.