改性松浦支渠疏浚底泥吸附重金属离子的研究

Study on Adsorption of Heavy Metal Ions by Modified Dredged Sediment of Songpu Branch Canal

中国河流每年产生大量的疏浚底泥,大量堆积不仅占用土地资源,而且对环境还有很大的影响。底泥的二次利用显得尤为重要,基于以废制废的原则,提高底泥资源化利用的价值,以松花江松浦支渠疏浚底泥为目标,对其进行资源利用。首先以丙烯酸、富马酸为原料,以过硫酸铵为引发剂制备聚AA-FA,以磷酸氢二钠中和制得聚AA-FA磷酸盐。利用聚AA-FA磷酸盐对热解的疏浚底泥进行改性,制备得到聚AA-FA改性松浦支渠疏浚底泥。研究发现聚AA-FA改性松浦支渠疏浚底泥对于重金属离子具有较强的吸附作用。在添加量质量分数为9%时脱除离子的能力最高可达到99%,脱除不同离子的能力由大到小顺序为Ni^(2+)、Pb^(2+)、Cr^(3+)。

Rivers in China produce a large amount of dredged sediment every year,which not only occupies land resources,but also has a significant impact on the environment.The secondary utilization of sediment is particularly important.Based on the principle of using waste to control waste,and in order to improve the value of sediment resource utilization,taking dredged sediment from the Songpu Branch Canal of the Songhua River as object,its resource utilization was carried out.Firstly,poly AA-FA was prepared using acrylic acid and fumaric acid as raw materials,ammonium persulfate as initiator,and poly AA-FA phosphate was obtained by neutralization with disodium hydrogen phosphate.The pyrolysis dredged sediment was modified using poly AA-FA phosphate to prepare poly AA-FA modified Songpu Branch Canal dredged sediment.Research has found that poly AA-FA modified dredging sediment of Songpu Branch Canal has strong adsorption effect on heavy metal ions.When the mass fraction of the added amount was 9%,the highest ability to remove ions reached 99%,and the ability to remove different ions in descending order was Ni^(2+),Pb^(2+),Cr^(3+).