新型合成聚合物重金属离子吸附剂及其吸附性能

阐述了新型聚合物重金属离子吸附剂的合成与改性及其对水溶液中Cd(Ⅱ)、Pb(Ⅱ)、Cu(Ⅱ)、Hg(Ⅱ)等重金属离子的吸附性能。这些聚合物重金属离子吸附剂对低浓度的重金属离子表现出了较好的吸附能力,其中聚合物吸附剂PGHyFeO-COOH对mg/L级的Pb(Ⅱ)、Cd(Ⅱ)、Hg(Ⅱ)的最大吸附量分别为211.4mg/g、155.0mg/g、147.2mg/g。这些吸附剂的吸附速度也较快,平衡吸附时间一般在60min左右,有的甚至只有几分钟。新型聚合物重金属离子吸附剂在水处理工业中具有广阔的应用前景。

镧掺杂对羟基磷灰石形貌与吸附性能的影响

研究在表面活性剂存在下合成不同掺杂量的镧掺杂羟基磷灰石,并对合成样品进行了初步的重金属离子吸附性能测试,了解不同掺杂量对镧掺杂羟基磷灰石形貌及吸附性能的影响。结果表明:La/Ca摩尔比为0.1时,合成了纯相的镧掺杂羟基磷灰石,La掺杂增大了羟基磷灰石的晶胞参数和晶胞体积;La/Ca摩尔比可以调控镧掺杂羟基磷灰石的颗粒尺寸,比值从0.05增加到0.1,颗粒长度由500 nm增加到1.5μm、直径从100 nm增加到250 nm;镧掺杂引起HAP的晶格畸变,可增加HAP的重金属离子吸附性能。

Adsorption of Heavy Metal Ions by Adsorbent from Waste Mycelium Chitin

The adsorption properties of chitin adsorbent from mycelium of fermentation industries for the removal of heavy metal ions were studied. The result shows that the chitin adsorbent has high adsorption capacity for many heavy metal ions and Ni2+ in citric acid. The influence of pH was significant:When pH is higher than 4.0, the high adsorption capacity is obtained,otherwise H+ ion inhibits the adsorption of heavy metal ions. The comparison of the chitin adsorbent with some other commercial adsorbents was made, in which that the adsorption behaviorchitin adsorbent is close to that of commercial cation exchange adsorbents, and its cost is much lower than those commercial adsorbents.