A new chelating reagent （2-mercapto-4-methyl-phenyl）-methanol was synthesized using p-methyl-benzenethiol and formaldehyde in sodium hydroxide solution and was characterized by FT-IR. The effects of tool ratio of p-methyl-benzenethiol to formaldehyde, dosage of NaOH, reaction temperature and time on the removal of nickel ions by the chelating reagent were investigated. When the benefieiation wastewater with 625 mg/L nickel ions was treated, adding chelator 1.3 times the theoretical amount or mixed agents 17.8 times the nickel mass could reduc...
