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甲醛作为一种无色有刺激性气味的有毒气体，主要危害表现为对皮肤粘膜的刺激作用，甲醛在室内达到一定浓度时，人就有不适感。当甲醛浓度大于0.08mg/m3时，就可引起眼红、眼痒、咽喉不适或疼痛、声音嘶哑、喷嚏、胸闷、气喘、皮炎等。

Formaldehyde, a toxic and colorless and irritating odor, is mainly harmful to skin and mucous membrane. When formaldehyde reaches a certain concentration indoors, it will be uncomfortable for people. When the concentration of formaldehyde exceeds 0.08mg/m3, can cause redness, itching, throat discomfort or pain, hoarseness, sneezing, chest tightness, asthma, dermatitis.

大家都知道新房装修之后要除甲醛，除甲醛的方法也各式各样，而最常见的说法就是活性炭除甲醛，那么活性炭除甲醛真的有用吗？

As we all know, after the renovation of the new house, formaldehyde is removed except for formaldehyde. The most common claim is that activated carbon can remove formaldehyde. Is activated carbon actually useful for formaldehyde removal?

活性炭我们或多或少都有了解，它是一种经过加工处理所得的黑色粉末状或块状、颗粒状、蜂窝状无定形碳，具有很大的表面积，对气体、溶液中的无机或有机物质及胶体颗粒等都有良好的吸附能力

Activated carbon we have more or less understanding, it is a result of processing the black powder, granular or blocky, honeycomb like amorphous carbon, has a large surface area and has good adsorption ability of solution gas, inorganic or organic matter and colloid particles etc.

但很多人不知道的是，普通的活性炭是存在吸附极限的，当吸附满了就达到饱和，其实吸附类的矿晶、炭类都会达到吸附饱和，而饱和之后不但不能继续吸附还有可能会发生脱附。脱附是一种可怕的现象，已经吸附进去的甲醛又重新释放造成二次污染，二次污染比一次污染更严重，可能只是轻度超标的房间因为活性炭长时间未更换可能就是超标倍数加重，虽然不可能加重很多，但是对于我们的健康来说肯定是有一定影响。毕竟健康不是小事，容不得小的纰漏，要是家里有老人孕妇或者孩子这些抵抗力较低的人群，就更容易生病了。

But what many people don't know is that ordinary activated carbon has the adsorption limit. When the adsorption is full, it will reach saturation. In fact, the adsorbed minerals and carbon will reach the saturation of adsorption. After saturation, it can not only continue to adsorb, but also may take off. Desorption is a terrible phenomenon, in the adsorption of formaldehyde has re released cause two pollution, two pollution is more serious than a pollution, may only slightly exceed the standard room for a long time without replacement of activated carbon is likely to exceed the standard ratio increased, although it is not possible to increased a lot, but for our health there is a certain effect. After all, health is not a small matter, can not allow small mistakes, if there are elderly pregnant women in the family or children with low resistance, it is easier to get sick.