It is suggested that the pH=10 and adjusted before the mixture FeO(OH) colloid to the MBF solution,and the volume rate was 1 5. The removal of direct yellow dye reached 98 7%.

• 上清液与水合氧化铁溶胶投量比为 1 5 ; pH值的调节在FeO(OH)溶胶加入之前 ,直接黄染料 (DY4 )的最高脱色率达 98 7%25。