Trimethylamine-modified lignophenol for the recovery of precious metals

トリメチルアミン修飾したリグノフェノールによる貴金属の回収

Parajuli, D.; 広田 耕一; 井上 勝利*

Parajuli, D.; Hirota, Koichi; Inoue, Katsutoshi*

トリメチルアミンを架橋リグノフェノールに固定して創製した4級アミン型吸着材を用いて、塩酸水溶液中のさまざまな金属イオン(Au(III), Pd(II), Pt(IV), Cu(II), Co(II), Fe(III), Ni(II), Zn(II))の吸着挙動について調べた。その結果、創製した吸着材はAu(III), Pd(II)及びPt(IV)に対して優れた選択性を示した。また、30, 50, 65Cで吸着試験を行い、Au(III), Pd(II), Pt(IV)に対する吸着速度定数を求めるとともに、活性化エネルギーを算出した。さらに、これらの金属イオンに対する最大吸着能を明らかにした。

A quaternary amine type sorbent has been prepared by the immobilization of trimethylamine group onto the crosslinked lignophenol matrix. The sorption behavior for a number of metal ions was studied in hydrochloric acid medium. From the batch test of individual metal ion as well as the mixture solution containing equal molar concentration of various metal ions, the sorbent was found to hold selectivity for Au(III), Pd(II), and Pt(IV) ions only with negligible sorption for other metal ions like Cu(II), Co(II), Fe(III), Ni(II), and Zn(II). The sorption kinetics was studied at 303, 323, and 338 K and elucidated the order of sorption of Au(III), Pd(II), and Pt(IV) and from the values of rate constants at different temperatures, the energy of activation has been evaluated. The sorption isotherm study revealed the Langmuir type sorption and from the Langmuir charts the maximum loading capacity of Au(III), Pd(II), and Pt(IV) has been evaluated.