Highly selective enrichment of Au using enaminone covalent organic polymers (COP)

Abstract

The second recovery of gold has fundamental environmental and economic significance.

Solvothermal Preparation of Microporous Polyureas for Au(III) Adsorption

“…Therefore, the adsorption behavior of NPU-A is more likely to manifest the homogeneous monolayer adsorption . To compare the adsorption performance between NPU-A and other adsorbents with ascendency in q max or preparation time, results have been collected and are summarized in Table , illustrating that NPU-A exhibits priority in higher adsorption capacity, faster adsorption kinetics, and shorter preparation time. − …”

A covalent organic polymer containing nitrogen and oxygen groups with high adsorption capacity and selectivity for gold ions under strongly acidic conditions

“…At 200–400 °C, the temperature continues to increase and the weight loss of the material is 8.14%, which is due to the collapse of the external pore size of the material, leading to a slow decrease in the mass of the COP material. 31 When the temperature is increased to 400 °C, the quality drops sharply, and the weight loss of the material is 33.11%, which was mainly due to the combustion of the organic matter. When the temperature is less than 400 °C, the structure of N-TPCOP is not dissipated, indicating that N-TPCOP has good thermal stability.…”

Chiral fluorescence recognition of glutamine enantiomers by a modified Zr-based MOF based on solvent-assisted ligand incorporation

“…In addition, the common Langmuir isotherm model was used to analyze the adsorption data and is represented as follows. 52 where Q m is the maximum adsorption capacity (mg g −1 ) and K is the Langmuir constant (L g −1 ) related to the free energy of adsorption. From the linearly dependent coefficient of the fitted equations in Table 4 , the Langmuir isotherm model fit the equilibrium data and the theoretically calculated equilibrium adsorption capacity was nearly the same as the measured one.…”