Tuning the diffusion dialysis performance by surface cross-linking of PPO anion exchange membranes—simultaneous recovery of sulfuric acid and nickel from electrolysis spent liquor of relatively low acid concentration

An overview of the recovery of acid from spent acidic solutions from steel and electroplating industries

“…Winniewski et al [109] studied the acid and base purification via bipolar electro-dialysis. Tongwen and Weihua [110] studied the simultaneous recovery of sulphuric acid and nickel from electrolysis of spent liquor of relatively low acid concentration by tuning the diffusion dialysis performance by surface cross-linking of poly(2,6-dimethy]-1,4-phenylene oxide) (PPO) anion exchange membrane. Tongwen and Weihua [111] also investigated the sulphuric acid recovery from titanium white (pigment) waste liquor using diffusion dialysis with a new series of anion exchange membranes.…”

A Viable and sustainable flat- membrane plate-and-frame module for spent acid regeneration and metal ion recovery

“…The volumetric expansion factor (VEF) is another significant membrane property that affects DD operational performance. A high VEF not only increases the pumping energy (“burden of recycling” [ 89 ]) but leads to a decrease in selectivity. A detailed study of VEF across the DD operation time for QPECH AEM has been done and results are provided in Fig.…”

Diffusion Dialysis for Acid Recovery from Acidic Waste Solutions: Anion Exchange Membranes and Technology Integration

“…Notably, H + , although positively charged, migrates more easily than other cations through the AEM due to its small size, low valence state and high mobility. Therefore, H + can migrate by the dragging effect with the anions from the feed solution into the receiving solution to maintain the electrical neutrality of the solutions [ 42 ]. As a result, the acid could be collected on the receiving side, while metal ions could be retained on the feed side.…”