梧桐树落叶碎屑对水中重金属吸附的初步研究

Primary Research on Adsorption of Heavy Metals by Litter Leaf Detritus of Chinese Parasol Tree

研究了南京市梧桐落叶碎屑对重金属 (Cr、Ni和Cu)离子的吸附作用。实验结果表明 :梧桐落叶碎屑对上述各种低质量浓度重金属溶液的吸附效率均高于 6 0 % ,对Cu离子的吸附效率更高达 90 % ,二次吸附效率仍高达 6 0 % ;随着水中重金属质量浓度的增加 (1～ 5mg/L) ,落叶碎屑对重金属吸附量也随之增大 ,对以上各重金属离子的混合溶液的吸附效果更好 ;而落叶碎屑的吸附效率与吸附时间、落叶碎屑的粒径的关系不显著 ;在吸附处理的方式中 ,振荡 >搅拌 >静置。

The adsorption of Cr,Ni,and Cu ions in water by litter leaf detritus of chinese parasol tree in Nanjing was studied.The results show that under the single ion condition,the adsorptive efficiencies of low concentration Cr, Ni and Cu ions are all more than 60%,and the adsorptive efficiency of Cu ion is even over 90%;the efficiency of second time adsorption is still higher than 60% . Amount of adsorption increases with the heavy metal ion concentration (1-5 mg/L).In the coexistent ion systems, the adsorptive efficiencies are better. Adsorptive time, concentration of heavy ions and granularities of litter leaf detritus have no obvious influence on the adsorptive efficiencies.Order of effectiveness of various adsorptive processing methods is : vibrancy>mixing round>static state.