| In recent years,the increasing discharge of industrial wastewater and domestic sewage not only causes serious pollution of water resources,but also causes harm to human health through different ways of transmission.In particular,some organic pollutants such as dye waste and phenols in wastewater are not only toxic,but also have good bioaccumulation and durability,which has become a serious problem in the aquatic environment.In order to effectively solve this environmental problem,a variety of new composite materials with adsorption and degradation properties are gradually developed and utilized by researchers.Among them,graphene oxide,sepiolite mineral materials and various metal frame zeolite materials could be activated and modified to obtain new composite materials with high adsorption performance due to their rich active groups and large specific surface area.However,the single physical adsorption has the disadvantage of easily reaching adsorption saturation,and cannot completely remove pollutants from wastewater.In view of the issue,this paper introduces the microbial Pseudomonas putida,which is combined with nanocomposites through immobilization.After the adsorption material reaches the treatment saturation,the loaded microorganism begins to play a degradation role,using a single adsorption effect and biodegradation synergy to achieve the complete degradation of organic pollutants in wastewater.(1)For the degradation of azo dyes in wastewater treatment,graphene oxide was prepared by hydrothermal process into aerogel(GA)with macroscopic appearance,and the iron metal frame(MIL-100)was loaded onto the GA surface by stepwise strategy to improve the GA adsorption performance for azo dye AO 10.Meanwhile,the microorganism Pseudomonas putida was introduced to degrade the azo dye AO 10,which was fixed with the activated GA/MIL-100 by chemical bond,forming a new type of bio-composite material with complete degradation ability to AO 10 pollutants.The processing results showed that the GA/MIL-100 biological composite material for immobilization of Pseudomonas putida could completely remove the AO 10 solution with the initial concentration of 50 and 100 mg/L in 14 and 26 hours,respectively,and the removal rate of AO 10 could still reach 100%after repeated utilization.(2)The discharge of phenol pollution source makes the water environment suffer serious pollution.In view of the problem of phenol pollution source,sepiolite is treated by acid modified chemical method,and the method of room temperature aging is combined with ZIF-8 zeolite skeleton to realize the efficient treatment of phenol pollution.Moreover,Pseudomonas putida,a microorganism that could effectively degrade phenol organic pollutants,was combined with CASEP/ZIF-8 through chemical bonding to achieve the complete removal of phenol pollutants.The studies showed that for phenol with concentrations of 10 and 20 mg/L,the Pseudomonas putida immobilized CASEP/ZIF-8 composite could be completely removed in 13 and 24 hours.(3)In order to remove the pollution of azo dye wastewater efficiently,a kind of nanocomposite CC/Co3O4 with high adsorption capacity for dye pollution source was prepared by the combination of Co3O4 and treated carbon cloth via hydrothermal and calcination method.The composite CC/Co3O4 has large surface area and good biocompatibility,is an excellent carrier for loading microorganisms Pseudomonas putida.Moreover,Pseudomonas putida has degradation effect on AO 10 pollutants.CC/Co3O4 nanocomposite combined with microorganism could improve the treatment capacity of AO10,which could completely degrade 50 mL of AO 10 solution with concentration of 50 and 100 mg/L in 12 and 24 hours,with has high treatment capacity and application potential for the degradation of azo waste dyes. |
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