TY - GEN
T1 - Di-Phenols Functionalized Chitosan as Selective Adsorbents for Extraction of Germanium
AU - Patel, Madhav
AU - Karamalidis, Athanasios K.
N1 - Publisher Copyright:
© 2023, The Minerals, Metals & Materials Society.
PY - 2023
Y1 - 2023
N2 - In the current study, catechol functionalized chitosan, C-Cat, was investigated for selective solid-phase extraction of germanium. Germanium is one of the critical elements because of its growing demand, supply risk, and inefficient production. The current Ge production processes, such as chlorination-distillation and solvent extraction, suffer from high energy requirements, high chemical consumptions, impurities co-extractions, and waste stream generations. The adsorbent was synthesized via Schiff's base reaction. The adsorbent morphology was different from the chitosan due to surface modification. C-Cat adsorbed Ge selectively in the presence of competitive ions with Kd values of 10,832.0 mL/g at pH 3 and 7417.6 mL/g at pH 4. The selectivity for Ge was also observed in Ge-spiked coal fly ash leachate. The distribution coefficients were correlated with metal hydrolysis constants, and linear free-energy relationships were developed for C-Cat. These LFERs can be used to predict the selectivity of C-Cat using the metal hydrolysis constants.
AB - In the current study, catechol functionalized chitosan, C-Cat, was investigated for selective solid-phase extraction of germanium. Germanium is one of the critical elements because of its growing demand, supply risk, and inefficient production. The current Ge production processes, such as chlorination-distillation and solvent extraction, suffer from high energy requirements, high chemical consumptions, impurities co-extractions, and waste stream generations. The adsorbent was synthesized via Schiff's base reaction. The adsorbent morphology was different from the chitosan due to surface modification. C-Cat adsorbed Ge selectively in the presence of competitive ions with Kd values of 10,832.0 mL/g at pH 3 and 7417.6 mL/g at pH 4. The selectivity for Ge was also observed in Ge-spiked coal fly ash leachate. The distribution coefficients were correlated with metal hydrolysis constants, and linear free-energy relationships were developed for C-Cat. These LFERs can be used to predict the selectivity of C-Cat using the metal hydrolysis constants.
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U2 - 10.1007/978-3-031-22761-5_14
DO - 10.1007/978-3-031-22761-5_14
M3 - Conference contribution
AN - SCOPUS:85151048479
SN - 9783031227608
T3 - Minerals, Metals and Materials Series
SP - 141
EP - 152
BT - Rare Metal Technology 2023
A2 - Ouchi, Takanari
A2 - Forsberg, Kerstin
A2 - Azimi, Gisele
A2 - Alam, Shafiq
A2 - Neelameggham, Neale R.
A2 - Kim, Hojong
A2 - Baba, Alafara Abdullahi
A2 - Peng, Hong
A2 - Karamalidis, Athanasios
PB - Springer Science and Business Media Deutschland GmbH
T2 - 10th Symposium on Rare Metal Technology, held at the TMS Annual Meeting and Exhibition, TMS 2023
Y2 - 19 March 2023 through 23 March 2023
ER -