Preparation Of Bipolar Membranes And Treatment Of Aniline Wastewater Using BMED Process

As an important technology to realize green production,bipolar membrane electrodialysis is widely used in chemical industry and environmental protection.In order to deeply discuss the optimization method and application of bipolar membrane electrodialysis,the following studies were carried out:1).Prepared a series of bipolar membranes with Fe-MIL-101-NH2 as their interfacial layer using casting method and optimized them.First,Fe-MIL-101-NH2 was prepared and characterized by X-Ray Powder Diffraction(XRD)and IR Spectrometer.Then,different loading concentrations of Fe-MIL-101-NH2 were introduced as the interfacial layer of self-made bipolar membranes.Thirdly,the morphologies of the prepared bipolar membranes were characterized by SEM.The thicknesses of interlayer in the bipolar membranes were determined by electrochemical impedance spectroscopy(EIS),and the membranes performances were evaluated by the current-voltage(?-?)curve and water splitting investigation.As proven,Fe-MIL-101-NH2 can accelerate the water splitting in the bipolar membranes.But the loading amount of Fe-MIL-101-NH2 in the interface significantly affects the membrane performance.An appropriate loading dose facilitates the formation of an obviously interfacial layer between the anion and cation layer in the bipolar membrane.But a higher loading amount will increase the thickness of the junction layer and increase the resistance in the bipolar membranes.Fe-MIL-101-NH2 at a loading concentration of 0.1 g/L is an optimal choice.Improved water dissociation efficiency in bipolar membrane modified with Fe-MIL-101-NH2 was also validated in the electrodialysis test.2).Bipolar Membrane Electrodialysis process realize the CO2 capture and finalize the treatment of salty aniline wastewater is inverstigated.The processes of treating salty aniline wastewater are consist of desalinization,CO2 capture and aniline removal three parts.Firstly,the desalinization is to remove the salt in saline aniline wastewater because the aniline is neutral in this condition,and achieveed a desalination rate higher than 96.51%.Secondly,in order to adjust the pH of wastewater and make the aniline positively charged,the CO2 is captured.In the process of removing aniline,the introduced CO2 in fuel gas is recovered in acid compartment of BMED while the aniline in wastewater concentrated in base compartment,which attribute to the recovery of the aniline and capture of the CO2.and achieveed a aniline removal rate higher than 98.68%.What's more,we discussed the processes in terms of multi-aniline content,multi-CO2 partial pressure and multi-steps,which clearly indicate the feasibility of the processes.On the whole,it contributed to the remove of aniline and the capture of CO2 at the same time in an eco-friendly and low cost way,which is worthy of further exploration.All in all,this paper not only explored the preparation and optimization of bipolar membrane,but also realized the reclamation of aniline wastewater and CO2 capture using bipolar membrane electrodialysis.