| Industrial wastewater entering the natural water system will cause great harm to the human body and aquatic organisms.Organic substances in water have attracted more and more attention because of their mutagenic,carcinogenic,genetic and other characteristics.Generally,high concentration industrial wastewater is treated by activated sludge,microbial degradation,ozonation and photodegradation before discharge.However,the above methods are generally complex in the treatment of low concentration organic pollutants,with defects such as high cost,difficult operation,incomplete treatment and secondary pollution.However,for the removal of low concentration organic matter in wastewater and drinking water,it is required to be able to treat it quickly and efficiently.Compared with the above methods,the adsorption method has the advantages of low cost,high removal efficiency and convenient operation.In this paper,?-cyclodextrin and its derivatives were used as matrix and tfppn as crosslinking agent to synthesize water-insoluble cyclodextrin polymer.According to the characteristics of bisphenol,nitrobenzene and Naphthalene Organic Compounds in chemical synthesis,combined with the actual concentration of industrial wastewater,the self-made water samples were studied.The synthetic cyclodextrin polymer was used to adsorb organic pollutants,and the adsorption equilibrium time,adsorption temperature,initial concentration of pollutants,the amount of adsorbent and the number of recycling of materials were tested to select the best adsorption conditions.The main research work and results are as follows:1. Completed the study of the adsorption of bisphenol compounds in water by cyclodextrin polymers.During the adsorption process,BPA can reach the adsorption equilibrium in 10 minutes,BPS and BPF can reach the adsorption equilibrium in 30minutes,and the adsorption rate is faster.Temperature has little effect on the adsorption effect,but the main body is high temperature,which is favorable for adsorption?BPA is low temperature,which is favorable for adsorption?.The maximum adsorption capacity of?-CDP for BPA,BPS and BPF can reach 32.46,35.93 and 34.23 mg·g-1,respectively.The maximum adsorption capacity of HE-?-CDP for BPA,BPS and BPF can reach 20.03,24.46 and 27.66 mg·g-1,respectively.The maximum adsorption capacity of HP-?-CDP for BPA,BPS and BPF can reach 28.61,39.09 and 33.12 mg·g-1,respectively The maximum adsorption capacity of BPA,BPS and BPF by Me-?-CDP can reach 27.79,32.29 and 32.60mg·g-1,respectively.The adsorption kinetics accords with pseudo second-order kinetics equation,the adsorption isotherm accords with Freundlich model,and the use performance of the material can be repeated more than five times.2. Completed the study on the adsorption of nitrobenzene compounds in water by cyclodextrin polymers.The adsorption speed is fast,and all can reach the adsorption equilibrium within 30 minutes.The temperature is about?-CDP,HE-?-CDP,HP-?Both-CDP and Me-?-CDP have little effect on the adsorption of nitrobenzene compounds in water,which proves that the material can be used in a wide temperature range.The maximum adsorption capacity of?-CDP for nitrobenzene,1,2-dinitrobenzene,2-nitrophenol,3-nitrophenol,2-nitroaniline and4-nitroaniline can reach 27.44,19.56,17.96,25.29,22.43 and 22.64 mg·g-1,respectively.The maximum adsorption capacity of HE-?-CDP for nitrobenzene,1,2-dinitrobenzene,2-nitrophenol,3-nitrophenol,2-nitroaniline and 4-nitroaniline was 22.06,12.91,13.92,20.56,15.55 and 15.48 mg·g-1,respectively.The maximum adsorption capacity of HP-?-CDP for nitrobenzene,1,2-dinitrobenzene,2-nitrophenol,3-nitrophenol,2-nitroaniline and 4-nitroaniline was 22.64,19.23,17.91,25.28,21.66 and 21.42 mg·g-1,respectively.The maximum adsorption capacity of Me-?-CDP for nitrobenzene,1,2-dinitrobenzene,2-nitrophenol,3-nitrophenol,2-nitroaniline and 4-nitroaniline was 23.54,17.72,16.26,25.14,20.05and 21.64 mg·g-1,respectively.The adsorption kinetics accords with the pseudo second order kinetic model.The adsorption isotherm accords with Langmuir adsorption isotherm model,which proves that the material is multi-layer adsorption.And the performance of materials can be repeated more than five times.3. The adsorption of naphthalene in water by cyclodextrin polymer was studied.Except for the equilibrium of HE-?-CDP adsorption of 2-naphthol in 120 min,it can reach the equilibrium within 60 min.The maximum adsorption capacity of?-CDP for 1-naphthylamine,2-naphthylamine,1-naphthol and 2-naphthol was 32.46,39.09,32.60 and 33.07 mg·g-1,respectively.The maximum adsorption capacity of HE-?-CDP for 1-naphthylamine,2-naphthylamine,1-naphthol and 2-naphthol was20.03,24.46,27.67 and 26.05 mg·g-1,respectively.The maximum adsorption capacity of HP-?-CDP for nitrobenzene,1-naphthylamine,2-naphthylamine,1-naphthol and 2-naphthol was 27.74,32.29,33.13 and 34.38 mg·g-1,respectively.The maximum adsorption capacity of Me-?-CDP for 1-naphthylamine,2-naphthylamine,1-naphthol and 2-naphthol was 28.61,35.94,34.24 and 35.92mg·g-1,respectively.The adsorption kinetics accords with pseudo second order kinetics equation,adsorption isotherm accords with Freundlich model,and the performance of materials can be repeated more than five times. |
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