保险代理人资格查询:请问一下吸附和解吸还有吸收的化学意义

简单地说：吸附就是物质被一种吸附剂进行吸附。比如活性炭是近年来发展很快的吸附剂。它的吸附率很高，而且具有选择吸附的能力，比如用来吸附金最高达98%，而对铜的吸附就很低。解吸就是把吸附剂吸附的物质通过另一种物质分离出来，比如活性炭吸附的金就可以用有机溶液解吸出来。
吸收的化学意义太多了 不知道问那方面的
原子吸收 红外吸收 等等
反正就是 光在照射过程中，光强一定的，但是在光运动过程中发生了衰减，肯定被某种物质吸收走了一部分光能量。这就是我所知道的！

吸附:固体或液体把气体或溶质吸过来，是附着在自己的表面上，如活性炭吸附毒气和液体中的杂质。
解吸:吸附的反义，通过加热等条件，固体或液体把吸附的气体或溶质解脱。
吸收:物提把外界的某些物质吸到内部，如海绵吸收水。特指有机体把组织外部的物质吸收到组织内部，如肠粘膜吸收养分。
楼主注意：这些都是物理意义，非化学意义。没有化学意义的吸附和解吸还有吸收。

吸附
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吸附也属于一种传质过程，物质内部的分子和周围分子有互相吸引的引力，但物质表面的分子，其中相对物质外部的作用力没有充分发挥，所以液体或固体物质的表面可以吸附其他的液体或气体，尤其是表面面积很大的情况下，这种吸附力能产生很大的作用，所以工业上经常利用大面积的物质进行吸附，如活性炭、水膜等。吸附过程有两种情况：

1. 物理吸附，在吸附过程中物质不改变原来的性质，因此吸附能小，被吸附的物质很容易再脱离，如用活性炭吸附气体，只要升高温度，就可以使被吸附的气体逐出活性炭表面。
2. 化学吸附，在吸附过程中不仅有引力，还运用化学键的力，因此吸附能较大，要逐出被吸附的物质需要较高的温度，而且被吸附的物质即使被逐出，也已经产生了化学变化，不再是原来的物质了，一般催化剂都是以这种吸附方式起作用。

还有一种可以进行连续操作的分子筛，物料连续进入填充床，分子筛可以只吸附固定体积的分子，再释放，而将体积过大的分子拦住，石油气和天然气的分离经常采用这种方式。

吸附作用是催化、脱色、脱臭、防毒等工业应用中必不可少的单元操作。
取自"http://zh.wikipedia.org/wiki/%E5%90%B8%E9%99%84"

页面分类: 化学 | 化学工程

Adsorption
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In chemistry, adsorption of a substance or adsorbate is its concentration on a particular surface of adsorbent. The result is the formation of a liquid or gas film on the surface of a solid body.

Consider a clean surface exposed to a gaseous atmosphere. In the bulk material, all the bonding requirements (be they ionic, covalent or metallic) of the constituent atoms of the material are filled. However, by definition, the surface represents a disruption of these bonds. It is then energetically favourable for these dangling bonds to react with whatever happens to be available. The exact nature of the bonding depends on the details of the species involved, but the adsorbed material is generally classed as being either physisorbed or chemisorbed.

During the adsorption process, the quantity of an adsorbate which adheres to or is adsorbed in an adsorbent depends on several factors : adsorbent type, adsorbate type, adsorbent surface size, concentration of the adsorbate, and temperature.

The simplest form of adsorption, physisorption, is due to weak forces of attraction, typically Van der Waals forces (also known as dispersion forces). Since these forces are ubiquitous, it follows that any clean exposed surface will rapidly accumulate a layer of physisorbed material.

Chemisorption occurs when a chemical bond, defined in this case as an exchange of electrons, is formed. The degree of exchange, and how symmetric the exchange is, depends on the materials involved. There is often a close parallel with the situation encountered in coordination chemistry. Chemisorption is particularly important in heterogeneous catalysis, the most commonly encountered kind in industry, where a solid catalyst interacts with a gaseous feedstock, the reactant/s. The adsorption of reactant/s to the catalyst surface creates a chemical bond, altering the electron density around the reactant molecule and allowing it to undergo reactions that would not normally be available to it.

The amount of material which accumulates depends on the dynamic equilibrium which is achieved between the rate at which material adsorbs to the surface and the rate at which it evaporates. The higher the rate of adsorption and the lower the rate of desorption, the greater the fraction of the available surface which will be covered by adsorbed material at equilibrium.
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See also

* absorption

Retrieved from "http://en.wikipedia.org/wiki/Adsorption"

Categories: Physical chemistry | Materials science

简单地说：吸附就是物质被一种吸附剂进行吸附。比如活性炭是近年来发展很快的吸附剂。它的吸附率很高，而且具有选择吸附的能力，比如用来吸附金最高达98%，而对铜的吸附就很低。解吸就是把吸附剂吸附的物质通过另一种物质分离出来，比如活性炭吸附的金就可以用有机溶液解吸出来。
吸收的化学意义太多了 不知道问那方面的
原子吸收 红外吸收 等等
反正就是 光在照射过程中，光强一定的，但是在光运动过程中发生了衰减，肯定被某种物质吸收走了一部分光能量。这就是我所知道的