| With the rapid development of industrialization,the emission of wastewater isincreasing,which has caused serious environmental pollution problems. Environmentalpollution is various, and heavy metal pollution is an important aspect.The heavy metalscan’t be converted into nonhazardous products when they got into the environment,so thesuspended particles in water could adsorb and precipitate these heavy metals in the bottomsediments,causing long-term water pollution.Some heavy metals in aquatic organismsendanger the health of human body by means of accumulation, enrichment and taking partin biosphere circulation.Water heavy metal pollution has become a global environmentalproblem, which has aroused the common concern of the whole society.At present, there are kinds of traditional methods to deal with heavy metal wastewater,such as ion exchange,electrolytic process, chemical precipitation, etc., but these methodscan not deal with heavy metal wastewater with low concentration effectively.Inaddition,the price is expensive, and it can even cause secondary pollution.Henceforth, weneed a kind of heavy metal processing method with high efficiency, low-cost.Biologicaladsorption technology is a new technology in industrial polluted wastewater.Thebiosorption for heavy metal ion in wastewater by all kinds of biologies is with high effectand relatively cheap price,while,it can deal with heavy metal ion wastewater of lowconcentration effectively,which arousing people’s attention.We study the adsorption experiment of rat tail algae （Sargassum thunbergii） of eastpole island,Zhoushan archipelago,Zhejiang to lead, copper, zinc, and cadmium ions, thenanalyze the adsorption dynamics performance for metal ions of the rat tail algae,andfinally study and ananlyze the functional group of metal ion by the infraredspectrometry.The main research results are as follows:（1） In low pH value,the rat tail algae has low adsorption efficiency to heavy metal Pb2+,Cu2+, Zn2+,Cd2+,and the adsorption efficiency will increase with the increase of pHvalue. However,the too high pH value could reduce adsorption efficiency.Rat tail algaeadsorption of heavy metal lead ion, when pH value is equal to6, the adsorption efficiencyreaches90%to the maximum; Rat tail algae adsorption of heavy metal copper ion, when the pH value is equal to5, the maximum adsorption efficiency reaches92%; Rat tail algaeadsorption of heavy metal zinc ion, when pH is equal to5,the maximum adsorption rate is98%; Rat tail algae adsorption of heavy metal cadmium ions, when the pH is equal to6the maximum adsorption rate was91%.（2） Under different temperature conditions, adsorption efficiency of heavy metal ionsPb2+, Cu2+, Zn2+, Cd2+by rat tail algae has a significant variation, and as the temperatureincreases, the adsorption rate will gradually increase.Rat tail algae adsorption of heavymetal lead ion, when the temperature reaches30℃or so, adsorption rate achieves themaximum for63%; Rat tail algae adsorption of heavy metal copper ion, the temperature at30℃, the adsorption rate achieves maximum for72%; Temperature for20℃, rat tail algae toheavy metal zinc ion adsorption rate achieves96％for maximum state;In comparison withthe impacts of rat tail algae on the adsorption to heavy metal lead, copper and zinc ions, theimpact of cadmium ion is the smallest, and the temperature is for20℃, and theadsorption efficiency achieves maximum state93%. Then raising the temperature, theadsorption rate will be decreased gradually.（3） The adsorption efficiency to heavy metal Pb2+,Cu2+, Zn2+, Cd2+by rat tail algae isincreasing with the increase of the rat tail algae amount. I n order to get high adsorptionefficiency as quickly as possible, and save the economic investment, it needs to determinethe best algae powder input. Rat tail algae adsorption of heavy metal lead ion, input for20g/L, adsorption rate is the most; Adsorption of copper ion, input for13g/L, adsorptionrate achieves the maximum; Rat tail algae adsorption of heavy metal zinc ion bestadsorbent input for10g/L, adsorption rate was99%; Adsorption of heavy metal cadmiumion best adsorbent input should be10g/L.The adsorption rate is93%, which has reachedthe maximum adsorption, adsorption state close to complete. Then the input is increased,the adsorption rate was essentially unchanged.（4） Rat tail algal in some concentration, with heavy metal Pb2+, Cu2+, Zn2+, Cd2+concentration increasing, adsorption efficiency presents the trend of decrease. Rat tail algaehas good adsorption performance to lead, zinc ion. Although adsorption rate also declinedwithin the range of10-200mg/, the adsorption rate is still to stay above90%.Rat tail algaeas a new type of biological adsorbent which is suitable for dealing with low concentrations of heavy metal ions from wastewater.（5） Dynamics research results show that: the rat tail algae adsorption of heavy metalin the beginning stage is a quick adsorption process, and in30minutes reach to adsorptionequilibrium state, which is decisided by algae bio-sorption mechanism characteristics.（6） It was clear that without metal ion processing rat tail algae and with the metal ionprocessing powder are divided into two categories by infrared spectroscopy analysis.Thehydroxyl of rat tail algae plays a major role in the adsorption of lead, copper, zinc andcadmium ions. |
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