In this study, N-methylene phosphonic chitosan (NPCS) was synthesized via formaldehydeaddition and condensation with phosphoric acid in a step reaction.
Similarly, pineapple, Onions and other grapefruit skin and formaldehyde in addition to the same invalid.
同理，菠萝、洋葱等均和柚子皮一样对除甲醛有效。
3
In addition, the higher content of free phenol in waste water was due to the incompleted reaction resulted by the exceedingly high molar ratio of phenol to formaldehyde.