关键词: FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-ascii-font-family: Calibri, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA">油茶饼粕；生物吸附剂；重金属废水；茶皂素

Abstract:

Camellia cakes are the waste product from processing industry of Camellia fruits, which are formed in the extraction process of its oil by a squeezer.The cakes contain a lot of valuable bioactive components such as tea saponin.In order to utilize Camellia cake resources, five kinds of bioadsorbents were prepared after the extraction of tea saponin by using alcohol extraction, ultrasound-assisted alcohol extraction, water extraction and ultrasound-assisted water extraction methods.The potential and mechanism of the five bioadsorbents for the removal of heavy metals from wastewater were investigated using Ni²⁺ ions.The bioadsorbent prepared by alcohol extraction process is superior to that by water extraction process.Ultrasound-assisted alcohol extraction improves the adsorptive performance of the sample obviously, with the maximum Langmuir adsorption ability of 17.57 mg·g^-1, and increases the extraction efficiency of tea saponin to 19.63%, probably due to the cavitation and mechanistic effects of ultrasound waves.The FTIR analysis of the bioadsorbents indicated that the —OH，—NH，C=O，C—OH and —CN groups on the surface of the bioadsorbents may be the adsorptive sites to Ni²⁺ ions.The alcohol extraction process of tea saponin can retain these functional groups, while the water extraction process may cause the dissolution of the water soluble components from the biomaterials, reducing the amount of the functional groups and the adsorptive ability of the water extracted bioadsorbents.

Key words: FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-ascii-font-family: Calibri, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA">油茶饼粕；生物吸附剂；重金属废水；茶皂素