椰壳活性炭对水中重金属离子的吸附研究

Research on the adsorption of coconut shell activated carbon for heavy metal ion in the water

研究活性炭对废水中重金属离子的吸附性,以椰壳活性炭与Zn^(2+)、Cd^(2+)、Pb^(2+)和Cu^(2+)重金属离子为研究对象,分析在不同pH、活性炭用量、振荡时间以及温度条件下,椰壳活性炭对重金属离子吸附能力的差异。模拟废水实验结果表明:(1)随着pH的增大,活性炭的吸附量也在增加,当pH>7时,随着pH的增大,活性炭的吸附作用有所减弱,pH=7时,活性炭对溶液中重金属离子的吸附能力最强;(2)活性炭投加量为6g时,其对这4种重金属离子的吸附能力均已达到饱和,并且对Zn^(2+)的吸附变化最显著;(3)振荡时间达到200min时,活性炭的吸附效果就达到饱和,其中,活性炭对4种重金属离子吸附能力由强到弱依次为:Zn^(2+)>Cd^(2+)>Pb^(2+)>Cu^(2+);(4)温度达到30℃时,活性炭对4种金属离子的吸附能力最佳。

Choosing the coconut shell activated carbon and Zn（2＋）,Cd（2＋）,Pb（2＋）and Cu（2＋）this 4 kinds of heavy metal ions as the research object,the activated carbon adsorption of heavy metal ions in waste water was studied.The difference of adsorption capacity was analyzed under different pH,the dosage of activated carbon,the oscillation time and temperature conditions for heavy metal ions.Under simulated wastewater condition,the experimental results showed that：（1）With the increase of pH,the adsorption volume of activated carbon increased.When pH value increased to alkaline,the adsorption subsided.Activated carbon adsorption ability of heavy metal ions in pH value of 7 solution was strongest.（2）Activated carbon additive quantity was 6 g,its adsorption ability of four kinds of heavy metal ions saturated,and the most significant changes in the adsorption of Zn（2＋）.（3）When the oscillation time was 200 min,activated carbon adsorption was saturated.Among them,the adsorption capacity from strong to weak on four kinds of heavy metal ions were：Zn（2＋）Cd（2＋）Pb（2＋）Cu（2＋）.（4）The adsorption ability on four kinds of metal ions was best at the 30℃temperature.