Air Purification Activated Carbon

空气净化活性炭

空气净化活性炭外观为颗粒状或者柱状，原料为木质、煤质或者椰壳，其中以椰壳为最佳。

空气净化活性炭各微晶之间才有许多形状不同，大小不等又有一定强度的空隙，这些空隙按孔径大小一般分为大孔、中孔和微孔。活性炭90%的表面积都在微孔上，它的比表面积可达几百甚至上千m2/g，孔容也比较大，所以微孔是决定空气净化活性炭吸附性能的重要因素。

空气净化活性炭的吸附特性不仅取决于它的孔隙结构，而且取决于它的化学组成。不完全饱和价或成对电子、在活性炭中加入的某些无机化合物、C-O表面化合物、表面官能团、活性炭结构中的杂原子等都对活性炭吸附性能有影响。

研究表明，活性炭表面化学性质主要由其表面化学官能团、表面杂原子和表面化合物确定。普通活性炭表面具有非极性和疏水性，对室内气体的吸附多属于物理吸附，能够吸附几乎所有的气体。但是，仅有物理吸附时只有极其微小的吸附能力，实用价值很小。而且活性炭是疏水性物质，有时缺乏对亲水性物质的吸附能力，此外物理吸附稳定性很差，在温度压力等条件变化时容易脱附而造成二次污染。表面化学改性主要改变活性炭的表面酸、碱性，引入或除去某些表面官能团，使其具有某种特殊的吸附或催化性能。对活性炭进行改性研究, 主要集中在氧化改性、还原改性及载杂原子和化合物改性等。由于室内空气混合物来源复杂，有的是极性的，有的是非极性的，这就需要对活性炭加以改性，使之能够吸附绝大部分气体污染物。

Yuanying 空气净化活性炭具有比表面积大、孔隙结构发达、吸附能力强、机械强度高、易再生等优点。能有效吸附空气中的甲醛、氨、氡、苯、二甲苯、香烟、油烟等有害气体及各种异味，尤其是致癌的芳香类物质。广泛应用于二氧化碳气体、氢气、氮气、氯化氢、乙炔、乙烯、裂化气、惰性气体等的净化；原子设施的净化；防毒面具、滤毒器材的充填；脱降空气中污染物以及混合气体的分类提纯。

Air Purification Activated Carbon is made of wood, coal or coconut shell, granular or cylindrical appearance. For air purification, the best is coconut shell.

Between crystallite of activated carbon have many spaces with different shape, size and certain strength. According to the aperture size these spaces are generally pided into big pore (>50nm), mid-hole (2.0-50nm) and micropore (<2.0nm). 90% specific surface area of activated carbon comes from micropore, its specific surface area can reach more than 1000m2/g, and pore volume also is large, so micropore is an important factor decided adsorption performance of air purification activated carbon.

The adsorption characteristics of air purification activated carbon not only depend on its pore structures, but also depend on its chemical compositions, such as incomplete saturation valence, heteroatoms (O, H, ASH), C-O surface compounds, inorganic compound, surface functional groups, etc.

Research shows that the surface chemical properties of activated carbon are mainly determined by its surface chemical functional groups, surface heteroatoms and surface compounds.

The surface of common active carbon possesses nonpolar and hydrophobic, to indoor gas adsorption are mainly physical adsorption, can adsorb almost all of the gases. However, only physical adsorption is extremely small adsorption ability, practical value is very small. Furthermore, active carbon is a hydrophobic material, sometimes lack of adsorption capacity of hydrophilic substances, in addition the stability of physical adsorption is poor, and it is easy desorption and causes secondary pollution when temperature, pressure and other conditions change.

Surface chemical modification is mainly to change the acid and alkali of activated carbon surface, adding and removing some surface functional groups, making it has some kind of special adsorption and catalytic properties. To the modification research of activated carbon, is mainly concentrated in the oxidative modification, deoxidization modification and modification by loading heteroatoms and compounds. Because indoor air mixtures have complex sources, some are polarity, and some are non-polarity, which need activated carbon to be modified so that it can adsorb most gaseous pollutants.

Application

Yuanying air purification activated carbon has big specific surface area, abundant pore structure, high mechanical strength, strong adsorption capacity, easy regeneration. It can efficaciously adsorb methanol, ammonia, radon, benzene, xylene, exhaust gas, lampblack, especially aromatic compound.

Widely used for purification of carbon dioxide, hydrogen, nitrogen, chlorine hydride, ethyne, ethylene, cracking gas, inert gases, atomic equipment; As the packing of antigas mask, poison gas filter; For dropping off air pollutants and classification purification of mixed gas.