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以前期工作中合成的树脂PAANa-TE为吸附剂进行重金属吸附测试,考察吸附剂用量、丙烯酸中和度、吸附时间、溶液pH、初始浓度和吸附温度对树脂吸附重金属离子Cu2+、Pb2+、Cr3+和Co2+性能的影响,用原子吸收分光光度计测定了树脂吸附Cu2+、Pb2+、Cr3+和Co2+后的残留浓度,树脂对4种金属离子的吸附容量分别为21.59、2.39、5.66和4.98 mmol/g,吸附容量大小为Cu2+>Cr3+>Co2+>Pb2+,吸附速率顺序为Cr3+>Pb2+>Cu2+>Co2+。结果表明,该树脂对高浓度重金属离子有较快速,高效率的吸附,吸附过程在100 min左右吸附容量达到最大,并用不同浓度的酸对吸附重金属离子的树脂进行脱附处理,脱附量很小,据此可考虑进一步对金属离子进行回收处理。且脱附率较低,因此,可对工业化和城市化进程所产生的各种化学形态的重金属水体污染物造成的生态环境和质量问题起到重要的改善作用。
In the previous work, PAANa-TE, a synthetic resin, was used to adsorb heavy metal ions. The effects of adsorbent dosage, acrylic acid neutralization degree, adsorption time, solution pH, initial concentration and adsorption temperature on the adsorption of heavy metal ions Cu2 +, Pb2 +, Cr3 + Co2 +. The residual concentration of Cu2 +, Pb2 +, Cr3 + and Co2 + was determined by atomic absorption spectrophotometer. The adsorption capacities of the resins to the four metal ions were 21.59, 2.39, 5.66 and 4.98 mmol / g, respectively. The capacity is Cu2 +> Cr3 +> Co2 +> Pb2 +, the order of adsorption rate is Cr3 +> Pb2 +> Cu2 +> Co2 +. The results showed that the resin adsorbed high concentration of heavy metal ions more quickly and efficiently. The adsorption capacity reached the maximum at about 100 min and the desorption of heavy metal ions adsorbed by different concentrations of acid. Small, according to which to consider further recycling of metal ions. And the rate of desorption is low, therefore, it can play an important role in improving the ecological environment and quality caused by various chemical forms of heavy metal water pollutants generated by industrialization and urbanization.