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Related Experiment Video

Updated: Dec 15, 2025

Quantitative SERS Detection of Uric Acid via Formation of Precise Plasmonic Nanojunctions within Aggregates of Gold Nanoparticles and Cucurbit[n]uril
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High-Efficiency Gold Recovery Using Cucurbit[6]uril.

Huang Wu1, Leighton O Jones1, Yu Wang1

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.

ACS Applied Materials & Interfaces
|July 11, 2020
PubMed
Summary
This summary is machine-generated.

Cucurbit[6]uril (CB[6]) enables highly efficient gold recovery, achieving 99.2% efficiency through coprecipitation with gold salts. This breakthrough offers a sustainable method for extracting gold from aqueous solutions.

Keywords:
coprecipitateouter surface interactionprecious metalresource recoverysolid-state superstructuresupramolecular assembly

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Environmental Science

Background:

  • Sustainable ecological environments necessitate efficient gold recovery methods.
  • Existing gold recovery processes often face challenges in efficiency and selectivity.
  • There is a growing demand for innovative materials and protocols for precious metal extraction.

Purpose of the Study:

  • To develop an extremely efficient and highly selective process for gold recovery.
  • To investigate the use of cucurbit[6]uril (CB[6]) as a gold extractant.
  • To understand the mechanism of gold anion complexation with CB[6] for coprecipitation.

Main Methods:

  • Instantaneous assembly between cucurbit[6]uril (CB[6]) and gold-bearing anions ([AuX4]-, X = Cl/Br).
  • Coprecipitation of gold salts (MAuX4, M = H/K) with CB[6] in aqueous solutions.
  • X-ray crystal structure analysis and Density Functional Theory (DFT) calculations to elucidate interactions and binding energies.

Main Results:

  • A gold-recovery efficiency of 99.2% was achieved using CB[6]·HAuCl coprecipitation under optimized conditions.
  • Supramolecular polymers and layered nanostructures were formed between CB[6] and gold anions, confirmed by X-ray crystallography.
  • DFT calculations indicated stronger binding energy between CB[6] and [AuCl4]- compared to [AuBr4]-, correlating with higher yields.

Conclusions:

  • Cucurbit[6]uril (CB[6]) serves as a highly effective extractant for gold recovery.
  • The developed protocol demonstrates a practical and efficient method for gold extraction, offering a sustainable alternative.
  • This research opens new avenues for designing advanced materials for precious metal recovery.