TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The device further comprises a third water-absorbing material disposed in the guiding tank and located between the first end and the first water-absorbing material. The impurity comprises ammonia, hydrogen sulfide or carbon monoxide. The first water-absorbing material comprises a non-woven fabric structure (T1). (T1): comprises many non-woven fibers; and many water-absorbing particles, where at least a part of the water-absorbing particles are combined with the non-woven fibers; and further comprises many hot-melt powder particles, where a melting point of the non-woven fibers is higher than a melting point of the hot-melt powder particles, the hot-melt powder particles are combined with the non-woven fibers, and at least a part of the water-absorbing particles are combined with the hot-melt powder particles and many core-sheath fibers, the core-sheath fibers comprise a core layer and a sheath layer, wrapping the core layer, the melting point of the non-woven fibers and a melting point of the core layer are higher than a melting point of the sheath layer, and a part of the water-absorbing particles are combined with the sheath layer. The material of the water-absorbing particles comprises calcium chloride, calcium oxide, silica gel, iron powder, sodium chloride, zeolite, activated carbon, phosphorus pentoxide, poly sodium acrylate, cane fibers, sodium borohydride, porous acidic water-absorbing material, psyllium flour, acidic polymer, alkaline polymer or cobalt chloride. The porous filter material comprises a non-woven fabric structure (S1). (S1): comprises many non-woven fibers and many impurity-absorbing particles, where at least a part of the impurity-absorbing particles are combined with the non-woven fibers; and further comprises many hot-melt powder particles, where at least a part of the impurity-absorbing particles are combined with the hot-melt powder particles and core-sheath fibers, each core-sheath fiber comprises core layer and sheath layer wrapping the core layer and a part of the impurity-absorbing particles are combined with the sheath layer. The material of the impurity-absorbing particles comprises activated carbon, zeolite, solid acid, acidic polymer or alkaline polymer. The material of the second or third water-absorbing material comprises cotton. The guiding tank has many bafflers to form a zigzag channel in the guiding tank, and first water absorbing material, porous filter material, and second water-absorbing material fill into the zigzag channel.