Mg/Al double-metal hydroxide regeneration of anion exchange resin by electric field intensification.
Fouled anion exchange resins were regenerated by electric field intensification of Mg/Al double-metal hydroxides. Regenerative experiments were performed with varying voltages (10-30 V) and dosages of Mg/Al hydroxides (0.045-0.135 mol and 0.015-0.045 mol, respectively) for 1-5 h. Optimal results were obtained under the following regenerative conditions: 20 V, 4 h, and 0.09/0.03 mol of Mg/Al hydroxides. The maximum regenerative capacity of resins was increased to 41.07%. The regenerative mechanism was presented by Fourier-transform infrared spectrum of resins and Mg/Al hydroxides, and the regenerative degree was analyzed with respect to conductivity, pH value, and electric current. Mg/Al hydroxides were also recycled after the regeneration. This method was proven to be cost-effective and environmentally friendly.
School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China E-mail: dljtdx_huanjing@163.com; School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China.
Ying
Y
Wang
School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China E-mail: dljtdx_huanjing@163.com.
Zhun
Z
Li
School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China E-mail: dljtdx_huanjing@163.com.
Yansheng
Y
Li
School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China E-mail: dljtdx_huanjing@163.com.
Zhigang
Z
Liu
D000535:Aluminum / Q000737:chemistry*; D000837:Anion Exchange Resins / Q000737:chemistry*; D004553:Electric Conductivity; D004560:Electricity; D004566:Electrodes; D005374:Filtration / Q000295:instrumentation; D006863:Hydrogen-Ion Concentration; D006878:Hydroxides / Q000737:chemistry*; D008274:Magnesium / Q000737:chemistry*; D016062:Porosity; D017550:Spectroscopy, Fourier Transform Infrared; D013997:Time Factors; D014025:Titanium / Q000737:chemistry; D014865:Waste Disposal, Fluid
D000837:Anion Exchange Resins; D006878:Hydroxides; D000535:Aluminum; D014025:Titanium; D008274:Magnesium