Preparation Of Modified Cellulose And Its Adsorption Properties For Arsenic And Mercury In Water

Cellulose is a natural polymer compound.Cellulose is obtained from renewable resources.It is not only easily biodegradable,environmentally friendly,but also easily modified to form multifunctional fibers.It is easy to obtain cellulose,low in cost,and easy to process..In this paper,arsenic ions in modified cellulose supported by cerium manganese double metal oxide and supported iron-aluminum double metal oxide modified cellulose were prepared by coprecipitation using cellulose as a carrier.The carboxyl group is attached to the cellulose by oxidative modification,and then it is made into a pore-filled cellulose film by physical modification to adsorb mercury ions in the water.Through a series of adsorption experiments and characterization methods of the three adsorbents,the successful modification of cellulose and its adsorption effect on arsenic ions and mercury ions in water were proved.Due to the certain adsorption performance of cerium oxide and the oxidizing property of potassium permanganate,the cerium manganese double metal oxide was loaded onto cellulose by chemical modification co-precipitation method,which made a good adsorption of arsenic ion solution.Efficient loaded 铈 manganese bimetallic oxide modified cellulose adsorbent.By investigating the influence of conditional factors on the adsorption test and the experimental mechanism of the model,it was found that the modified cellulose adsorbent has a good adsorption effect on the arsenic ion solution at pH=2-10.The modified cellulose adsorbent The optimum pH of adsorption of arsenic ion solution is 7.The model fitting shows that the mechanism of the arsenic-modified cellulose adsorbent on the arsenic ion solution is monolayer chemical adsorption.Through a series of characterization methods,SEM and SEM-mapping were used to observe the distribution of strontium and manganese on the surface of cellulose.The FITR characterization and EDS elemental analysis also confirmed that the lanthanum manganese double metal oxide on cellulose was loaded on cellulose.Successful,and has a certain adsorption effect on arsenic ion solution.Since iron and aluminum oxide have good adsorption capacity,iron and aluminum double metal oxides are supported by coprecipitation to cellulose to obtain an adsorbent having strong adsorption effect on arsenic ion solution.By investigating the influence of conditional factors on the adsorption test and the experimental mechanism of the model,it was found that the optimum pH of the arsenic ion solution adsorbed by the iron-aluminum modified cellulose adsorbent was 7 and the supported iron-aluminum double-metal oxide modified cellulose pair The maximum adsorption capacity of the arsenic ion solution was 32.12 mg/g.The adsorption process of arsenic ions adsorbed by supported iron-aluminum bimetal oxide modified cellulose conforms to Langmuir isotherm adsorption model and quasi-secondary kinetic model.The mechanism of iron-aluminum modified cellulose adsorbent on arsenic ion solution is monolayer chemical adsorption..Through a series of characterization methods,SEM and SEM-mapping,it was observed that iron and aluminum were distributed on the surface of cellulose.The FITR and EDX elements demonstrated that the iron-aluminum double-metal oxide on cellulose was successfully loaded on cellulose.And has a certain adsorption effect on the arsenic ion solution.The modified carboxycellulose membrane is oxidatively modified to attach a carboxyl group to the cellulose,and then physically modified to form a pore-filled cellulose film for adsorbing mercury ions in the water.It can be seen from the experiment that the modified carboxyl cellulose membrane has strong adsorption capacity for heavy metal mercury in water,and the optimum pH of adsorption mercury ion solution is 5.And the adsorption process at pH=1-6 has a good adsorption effect on the mercury ion solution.In addition,the modified carboxyl cellulose film can be well reused.When the mercury solution adsorbing 10 mg/L was recycled four times,the adsorption efficiency of the mercury solution was still 81.05%.And through a series of characterization methods,it was observed by SEM and SEM-mapping that there are many nano-scale pores in the film.The FITR has been successfully demonstrated by the FITR to some extent,and the carboxyl group is successfully introduced on the modified carboxyl cellulose membrane.Mercury ions have a certain adsorption capacity.