日本語フィールド
著者：Parajuli, Durga; Kawakita, Hidetaka; Inoue, Katsutoshi; Funaoka, Masamitsu.題名： Recovery of gold(III), palladium(II), and platinum(IV) by aminated lignin derivatives.発表情報： 巻: 45 ページ: 6405-6412キーワード：lignin, aminated, precious metals, recovery概要：抄録：Conventional metallurgical processing of precious metals involves the use of large amts. of toxic chems. There is a need to develop environmentally benign metallurgical technol. for precious metals. Two types of adsorption gels, contg. primary amine and ethylenediamine functional groups and abbreviated as PA-lignin and EN-lignin, resp., were prepd. from wood powder. Both of these adsorption gels were effective for the adsorption of Au(III), Pd(II), and Pt(IV) from weak to strong hydrochloric acid media. In contrast, base metals such as Cu(II), Fe(III), Ni(II), and Zn(II) were almost not adsorbed on either gel. The precious metals were adsorbed on the gels according to the Langmuir adsorption model, and the highest max. adsorption capacity was obsd. for Au(III). The formation of ion pairs of metal-chloro complex anions and protonated adsorption gels in acidic media was proposed to be the main adsorption process. However, in the case of Au(III) adsorption, a reducing adsorption mechanism was confirmed to occur by ref. to XRD spectra and SEM images of the gels obtained after adsorption.英語フィールド
Author：Parajuli, Durga; Kawakita, Hidetaka; Inoue, Katsutoshi; Funaoka, Masamitsu.Title： Recovery of gold(III), palladium(II), and platinum(IV) by aminated lignin derivatives.Announcement information: Vol: 45 Page: 6405-6412Keyword：lignin, aminated, precious metals, recoveryAn abstract：Conventional metallurgical processing of precious metals involves the use of large amts. of toxic chems. There is a need to develop environmentally benign metallurgical technol. for precious metals. Two types of adsorption gels, contg. primary amine and ethylenediamine functional groups and abbreviated as PA-lignin and EN-lignin, resp., were prepd. from wood powder. Both of these adsorption gels were effective for the adsorption of Au(III), Pd(II), and Pt(IV) from weak to strong hydrochloric acid media. In contrast, base metals such as Cu(II), Fe(III), Ni(II), and Zn(II) were almost not adsorbed on either gel. The precious metals were adsorbed on the gels according to the Langmuir adsorption model, and the highest max. adsorption capacity was obsd. for Au(III). The formation of ion pairs of metal-chloro complex anions and protonated adsorption gels in acidic media was proposed to be the main adsorption process. However, in the case of Au(III) adsorption, a reducing adsorption mechanism was confirmed to occur by ref. to XRD spectra and SEM images of the gels obtained after adsorption.