以上三种吸附剂对简单组分工业废水的处理效果明显。这种吸附剂优于同类产品的另一个特点是使用后无需回收。russia's south ural state university has developed a mixed adsorbent that can clean sewage.it can efficiently adsorb heavy metals from sewage.currently,this adsorbent has passed the test,and obtained a patent.
fly ash can be used as an adsorbent for chromium-containing wastewater.the fly ash is in the form of hollow glass beads.its role is mainly physical adsorption,different grades of fly ash have different specific surface areas,the adsorption performance is quite different,the first-grade fly ash has a better adsorption effect.and gather in another phase (especially the solid phase).according to the different adsorption capacity of the solid surface,adsorption can be divided into three types: physical adsorption, chemical adsorption and ion exchange adsorption; the adsorption produced by intermolecular force between adsorbent and adsorbate is called physical adsorption.physical adsorption is a common adsorption phenomenon,due to the physical adsorption of petroleum molecules,so the heat of adsorption is small,generally at 41.within 9kj/mol.chemical adsorption is a chemical reaction that occurs when electrons are exchanged or shared between the adsorbate and the surface of the adsorbent.
among them, the adsorption method is recognized because of its simple operation and cost advantage.however, traditional adsorption materials are usually not economical enough.shortcomings such as low adsorption efficiency and difficulty in recovery and regeneration,there is an urgent need to develop a new type of highly efficient and recyclable adsorbent.
mercury is one of the most harmful heavy metals,widely used as pesticides,chlor-alkali chemistry,battery,industries such as electronic devices.the mercury ions in the water are highly active,it poses a serious threat to human health and the ecosystem.the treatment of mercury pollution has become one of the main concerns in the global environmental science and technology field.china's *** comprehensive wastewater discharge standard sets strict limits on the discharge of mercury in industrial wastewater.the maximum allowable concentration is 0.05 mg/l.therefore,the advanced treatment of mercury-containing wastewater has become a challenge in the field of mercury pollution control.吸附达到饱和后吸附剂也可以再生,再生条件为10g吸附剂,经100ml 1:1氯化处理,其转化率达到95%以上。
对于某些非常大的分子的混合物,例如汽油 石脑油 等等,建议使用介孔活性炭吸附材料。同样, 这种吸附剂对铬的吸附仅对六价铬有效。在自然条件下受油污染的土壤需要数十年的时间才能修复。例如:abs或某些杂环化合物,这些物质可以通过吸附去除。静电吸附剂是一种固体物质,可以有效地吸附气体或液体中的某些成分。在塑料的生产过程中, 特别是再生塑料在一定的加工温度下会产生许多有毒有害气体。粉煤灰作为吸附剂,它的活性成分是少量的活性炭,对金属离子具有吸附和过滤作用。
吸附是去除痕量有机污染物的最有效方法(含量较少,危害更大)。吸附剂通常具有以下特征:比表面积大,合适的孔结构和表面结构; 对被吸附物的吸附能力强; 通常不与被吸附物和介质发生化学反应; 易于制造,易于再生; 具有良好的机械强度 等等吸附剂可以根据孔径,颗粒形状化学成分,表面极性分类例如粗孔和细孔吸附剂,粉状的粒状,剥离吸附剂。此外, 许多化合物如各种添加剂 增塑剂 在塑料生产中添加了阻燃剂和阻燃剂。 对于大风量,低浓度混合气体建议使用蜂窝状活性炭作为吸附材料。复杂制革废水的处理效果差。许多工业废水中含有难以降解的有机物,这些有机物质很难或不可能通过常规生物学方法除去