电气石和微生物对水溶液中铅吸附研究

Lead Adsorption by Tourmaline and Microorganism

论文探讨了电气石、不同微生物、以及电气石与枯草芽孢杆菌(Bacillus subtilis,简写B.subtilis)联合对Pb2+的吸附效果。研究表明,溶液pH=5时,电气石吸附效率比B.subtilis高7.9%,当溶液pH值升到5.5时,B.subtilis和电气石对Pb2+的吸附效率均升高,但B.subtilis比电气石吸附效率高15.35%;当溶液pH=5时,130 min前B.subtilis对Pb2+的吸附效率低于白腐真菌(Phanerochaete chrysoporium,简写P.chrysoporium),但终点时B.subtilis对Pb2+的吸附效率高于P.chrysosprium对铅的吸附,当溶液pH=5.5时,B.subtilis对Pb2+的吸附效率明显高于P.chrysosprium,证实细菌与真菌吸附重金属性能不同;电气石与B.subtilis联合吸附铅优于它们单独的吸附效果,表明电气石和微生物吸附重金属具有协同作用。

Synergistic effect of Pb^2＋adsorption by tourmaline and microorganisms was investigated in a lab-scaled experiment.Microorganism used as bio-sorbent were B.subtilis and P.chrysosporium and their adsorption capabilities of Pb^2＋ were compared.Results showed that B.subtilis was worse than P.chrysosporium within the initial 130 min（a）t,but became better than the latter when the time elapsed to 400 min when pH was 5,and B.subtilis was much better than P. chrysosporium in terms of Pb^2＋adsorption under the condition of pH 5.5.Efficiency of lead adsorption on tourmaline in aqueous solution was 7.9%higher than that on B.subtilis when pH was 5;besides,higher value of pH（5.5）of the aqueous solution enhanced the adsorption efficiencies of both.It was concluded that the adsorption efficiency of tourmaline combined with B.subtilis was far better than those of the separate ones.