KIO_3改性炭基催化剂的制备及其吸附性能评价

Preparation and adsorption performance evaluation of carbon-based catalysts modified by KIO_3

城市生活垃圾填埋场的恶臭污染现已成为全球广泛关注的的环境问题。对于低浓度、小范围的恶臭污染,吸附催化法因其操作简单、见效快等优点成为研究的热点。实验中分别以市售果壳颗粒活性炭(AC)、市售黏胶基活性炭纤维(ACF)、自制核桃壳超级活性炭(SAC)为载体,采用碘酸钾(KIO_3)对其进行改性处理,研究改性前后对H_2S的吸附硫容量及穿透行为。结果表明:改性前的吸附硫容量SAC>ACF>AC,最高可达351 mg/g;改性后的吸附硫容量1.0%KIO_3-SAC>3%KIO_3-ACF>1.0%KIO_3-AC,最高可达459 mg/g,其中,1.0%KIO_3-SAC的吸附穿透时间最长,高达470 min。通过多种表征手段证明,改性炭基催化剂表面化学性质发生改变,吸附H_2S后产物多为硫单质,并伴有少量硫酸盐生成。

The odor pollution of municipal solid waste landfill has now become an environmental issue with worldwide concern.For low concentration and small range of odor pollution,adsorption catalysis has become a hot spot because of its simple operation and quick effect.In the experiment,the commercially available activated carbon(AC)and viscose based ACF and the super activated carbon(SAC)made of walnut shell were used as the carrier,respectively,which were modified with KIO3.The adsorption capacity and penetration behavior of the typical sulfur containing malodorous gas H2S before and after modification were studied.The results show that the sulfur capacity before modification is SAC>ACF>AC,up to 351 mg/g.The sulfur capacity after modification is 1.0%KIO3-SAC>3%KIO3-ACF>1.0%KIO3-AC,up to 459 mg/g.And the adsorption penetration time of 1.0%KIO3-SAC is the longest,up to 470 min.It has been proved that the surface chemical properties of the modified carbon based catalysts are changed by a variety of characterization means.After the adsorption of H2S,the products are mostly simple substance of sulfur,accompanied by a small amount of sulfate.