Preparation Of Ni-mSA/mCS Bipolar Membrane And Its Application In Green Synthetic Process

Ni-mSA/mCS bipolar membrane(BPM)was prepared by sodium alginate(SA)and chitosan (CS),which were modified by Ca²⁺ and glutaraldehyde(GA) as linking reagents,respectively. FTIR,SEM,TG,mechanism performance,swelling degree,moisture content,ion exchange capacity,viscosity were investigated.Ni-mSA/mCS BPM was used as a separator in the electrolysis cell to produce FeO₄^2-.The optimum condition of electro-generated ferrate is J=20 mA·cm^-2 and T=50℃.The experiment results showed that H₂O in the interface of Ni-mSA/mCS BPM can split to H⁺ and OH^-.BPM is available in preventing FeO₄^2- transporting to cathode chamber and supplementing OH^- in anode chamber in time from cathode chamber.Ni-mSA/mCS BPM was used as a separator in the electrolysis cell to produce thioglycolic acid(TGA).The experiment results showed that TGA was prepared effectively by electro-reduction of DTDGA with the mixture of TGA and DTDGA as cathode electrolyte, 25%H₂SO₄ as anode electrolyte,nickel net as cathode,Pb as anode.The current efficiency was up to 66.7%at the room temperature during the current density Was 10 mA·cm^-2 and the working voltage was below 3.0 V during electrolysis process.Compared with the traditional metal reduction method,the electro-reduction technology saves the zinc powder and eliminates the pollution to environment.Ni-mSA/mCS BPM was prepared and used as a separator in the electrolysis cell to produce glyoxylic acid in pairs.The experiment results showed that PbO₂ was used as anode,the mixture of saturation oxalic acid and 0.1 mol·L^-1 HCl was used as cathode electrolyte,the mixture of 10%glyoxal and 10%KBr was used as anode electrolyte,the current efficiency was up to 82.9% in the cathodic room and 75.7%in the anodic room respectively at the room temperature during the current density was 20 mA·cm^-2.The electrolysis voltage was as low as 2.7 V.H⁺ generated by BPM moves into the cathodic chamber in time from mSA to supplement H⁺ consumed by electro-reducation of oxalic acid for generating glyoxylic acid;OH^- moves into the anodic chamber in time from mCS to combine with H⁺ produced by electro-oxygenation of glyoxal for generating glyoxylic acid and impel the reaction go along.