不同纸浆对甲醛气体的吸附性能

Adsorption Performance of Various Pulps for Formaldehyde Gas

通过静态甲醛吸附实验,研究了本色与漂白针叶木硫酸盐浆(KP)、本色与漂白阔叶木KP、本色竹KP以及本色亚硫酸铵针叶木浆等9种浆的甲醛吸附速率,测定了11种不同纸浆在相同条件下的甲醛吸附量,并与两种市售吸附用活性炭进行了对比.实验结果表明:室温下9种浆的甲醛饱和吸附时间均小于3 h,多为2~3 h.本色针叶木和阔叶木KP对甲醛的吸附速率大于漂白针叶木和阔叶木KP.一般饱和吸附量越大,吸附速率也越快.实验条件下吸附4 h后纸浆的甲醛吸附量结果是本色亚硫酸铵针叶木浆最大(213 mg/kg),本色针叶木KP和本色桦木KP以及本色桉木KP次之,其甲醛吸附量在179~193 mg/kg之间;漂白针叶木KP和漂白阔叶木KP的甲醛吸附量较小,分别为135 mg/kg和126 mg/kg.本色烧碱–蒽醌麦草浆和本色高得率竹浆对甲醛的吸附性能与本色木材浆相近.冷碱浸渍能提高纸浆的吸附效果.有些纸浆的甲醛吸附效果可达到甚至超越一些吸附用活性炭的吸附效果.

Static formaldehyde adsorption experiments were conducted to investigate the formaldehyde adsorption rates of nine pulps.The pulps included unbleached and bleached hardwood kraft pulp(KP),unbleached and bleached softwood KP,unbleached bamboo KP,unbleached softwood ammonium sulfite pulp and so on.The formaldehyde adsorption of 11 different pulps under the same conditions were measured and compared with two kinds of commercially available activated carbon for adsorption.The results indicate that the saturated adsorption time of formaldehyde of the 9 pulps at room temperature was less than 3 h,usually between 2 h and 3 h.The formaldehyde adsorption rates of the unbleached softwood and hardwood KP were greater than that of the bleached softwood and hardwood KP.In general,the larger the saturated adsorption amount,the faster the adsorption rate.Under the experimental conditions and after four-hour adsorption,the unbleached softwood ammonium sulfite pulp had the best adsorption property(213 mg/kg),the unbleached birch KP and the unbleached eucalyptus KP were the next(179-193 mg/kg),while the formaldehyde adsorption amount of the bleached softwood and hardwood KP were the lowest(135 mg/kg and 126 mg/kg respectively).The unbleached wheat straw soda-AQ pulp and unbleached bamboo high yeild pulp had the similar formaldehyde adsorption performance as the unbleached wood pulp.Cold alkali impregnation can improve the adsorption performance.The formaldehyde adsorption effect of some pulps can be the same as or even better than that of some activated carbon.