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Rice paper adsorbent for gold recovery.

Seung Su Shin¹, Seungho Lee¹, Sung-Joon Park²

¹Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Republic of Korea.

Proceedings of the National Academy of Sciences of the United States of America

|May 26, 2026

Summary

This summary is machine-generated.

Rice paper transformed into hydrazine-functionalized rice paper (Hz-RP) offers a sustainable method for gold recovery from industrial waste. This biomass-derived adsorbent efficiently captures gold, enabling a circular economy approach.

Keywords:

adsorbents adsorption gold recovery rice paper technoeconomic and life-cycle analyses

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Published on: February 12, 2019

Area of Science:

Materials Science
Environmental Science
Green Chemistry

Background:

Growing global demand for gold necessitates sustainable recovery methods from industrial waste.
Current gold adsorbents often involve complex fabrication and petroleum-based chemicals, posing economic and environmental challenges.

Purpose of the Study:

To develop a sustainable, cost-effective, and high-performance gold adsorbent from biomass.
To investigate the transformation of rice paper into an efficient gold recovery material.

Main Methods:

Facile aqueous-phase chemical modification (hydrazination) of rice paper (RP) to create hydrazine-functionalized RP (Hz-RP).
Characterization of Hz-RP's mesoporous structure and mechanical integrity.
Evaluation of Hz-RP's gold adsorption capacity, selectivity, and kinetics from complex solutions like electronic waste leachate.

Main Results:

Hz-RP exhibits a stratified mesoporous structure and excellent mechanical stability in water.
Hz-RP demonstrates rapid, effective, and selective gold recovery through collaborative chemisorption and reduction.
The adsorbent outperforms many existing gold adsorbents and allows for high-purity gold recovery via calcination.

Conclusions:

Biomass-derived Hz-RP provides a sustainable and efficient pathway for gold recovery from industrial waste.
This method supports a circular resource economy by valorizing biomass and recovering valuable metals.
The Hz-RP-based process is economically and environmentally beneficial for gold recovery from electronic waste.