改性泥炭对UO_2^(2+)、^(137)Cs等吸附交换性能的影响  

Absorption Exchange Reactions of the Modified Peat to UO_2^(2+)、^(137)Cs、^(169) Yb and HPO_4^(2-)

作　　者：王玉琨[1] 岳廷盛[2] 

机构地区：[1]西安石油学院化工系,陕西西安710065 [2]兰州大学

出　　处：《西安石油学院学报（自然科学版）》2000年第1期36-38,共3页Journal of Xi'an Petroleum Institute（Natural Science Edition)

摘　　要：泥炭经化学处理可有效吸附交换水中微量放射性元素离子等，用于净化水体．用廉价、易得的改性泥炭作吸附剂，研究改性泥炭中腐植酸对ＵＯ２＋２ 、１３７Ｃｓ、１６９Ｙｂ 和ＨＰＯ２－４ 的吸附交换；由吸附交换规律及测定的吸附交换平衡时间考察了ｐＨ 等因素对吸附率Ｅ、分配系数Ｋｄ 的影响；测定了吸附等温线，发现改性泥炭对ＵＯ２＋２ 和１６９Ｙｂ 的吸附交换服从Ｆｒｅｕｎｄｌｉｃｈ 等温式，而对１３７Ｃｓ和ＨＰＯ２－４的吸附交换则服从Ｌａｎｇｍ ｉｕｒ等温式，并讨论了吸附交换机理．Chemically modified peat is widely applied in cleaning water due to its higher absorption capacity to ions of trace elements, especially radio elements in water.By determining the absorption exchange equilibrium time, the absorption behaviors of humic acids in the modified peat to UO 2+ 2、 137 Cs、 169 Yb and HPO 2- 4 are studied respectively.It is found that the absorption to UO 2+ 2 (or 169 Yb) obeys Freundlich′s isotherm, and the absorption to 137 Cs(or HPO 2- 4) accords with Langmiur′s isotherm. The effect of pH value on the absorption exchange percentage(E) was examined, and the partition coefficient (K d) was measured for these species. The absorption exchange mechanism is discussed briefly.

关 键 词：腐植质 吸附 放射性元素 改性泥炭 水体净化 

分 类 号：X520.5[环境科学与工程—环境工程]