细菌纤维素的改性及其重金属离子吸附能力研究

北京理工大学珠海学院2020届本科生毕业论文Modification of bacterial cellulose and adsorption propertiesof heavy metal ions-Study on the Removal of Mercury andCadmium in WateAbstractResearch on the treatment of heavy metal wastewater has been a relatively maturefield in China,among which the adsorption method is more popular,it is a directaddition of adsorbent to treat the wastewater.But in order to improve the efficiency ofwastewater treatment,in addition to using new and efficient adsorption materials,thecondition control of adsorption is also very important.In this experiment,new magneticcellulose materials were used to explore the optimum adsorption conditions for heavymetal mercury and cadmium wastewater to improve the adsorption efficiency.it wasmodified by using the inexhaustible pure natural material bacterial cellulose in nature asthe parent body of adsorbent.the modified cellulose is magnetic and has a new type ofmaterial which is easy to separate and even can be recycled.The optimum conditionsfor adsorption of heavy metal mercury and cadmium by magnetic cellulose wereinvestigated.experiment process using orthogonal test design method,in order to betterset the conditional factor interval of orthogonal time,single factor analysis of each ionPH value,adsorbent dosage,adsorption time adsorption efficiency change curve,explore the range of the level of a certain factor.The orthogonal experimental resultsshowed that the optimum adsorption conditions of mercury ions under the adsorption ofmagnetic cellulose PH value 7,adsorbent dosage :0.07 g,adsorption time:120 minutes,removal rate up to 84.95%.the primary and secondary ranking of three factorsaffecting the adsorption of mercury ions by magnetic cellulose:PH value adsorption