“…Especially anionic surfactants, which are composed of charged hydrophilic parts, can statically attract the positively charged copper ions, thereby interfering with the electrolytic recovery of copper. [11][12][13] In addition, if the non-ionic surfactants in the wastewater coexist with anionic surfactants, they attract each other through their hydrophobic tails. A mixture of anionic and non-ionic surfactants affects nucleation and crystal growth in copper electrocrystallization, which largely determines the physical and chemical properties of copper ion electrodeposition.…”