BACKGROUND With the aggravation of the greenhouse effect, much attention is given to the capture of CO2 before its emission into the atmosphere. So far, various solid adsorbents have been developed and used. Among them, solid materials modified with organic‐amines are promising on account of good adsorption and desorption performance. In the present work, triethylenetetramine (TETA) modified solid Fe‐Zr adsorbents were synthesized and characterized. The performance of the adsorbents for CO2 adsorption was tested in a stream of 5% CO2. RESULTS The Fe‐Zr support was first synthesized, and TETA was successfully grafted onto its surface. The adsorbents show good thermal stability and CO2 adsorption ability. Increase in the amount of TETA and increased gas flow rate have a positive influence whereas increase of the adsorption temperature has a negative effect on CO2 adsorption capacity. At 200 mg TETA loading and a flow rate of 20 cm3 g−1, the adsorbent achieves a maximum adsorption capacity of 4.1 mmol g−1 at 75 °C. In addition, the adsorbent exhibits excellent reusability and cyclic performance. CONCLUSION Remarkable adsorption capacity and good recyclability suggest that synthesized TETA‐functionalized Fe‐Zr adsorbents have high potential for CO2 capture in industry. © 2015 Society of Chemical Industry

Mesoporous molecular sieve Zr‐MCM‐41 was modified with triethylenetetramine (TETA) and tested for carbon dioxide (CO2) adsorption for the first time. The adsorbent was characterized by powder X‐ray diffraction, N2 adsorption‐desorption, energy dispersive spectrometer, Fourier transform‐infrared spectroscopy, thermogravimetric analysis, and temperature‐programmed desorption of CO2 and NH3. A maximum CO2 adsorption capacity of 3.36 mmol g−1 at 50°C in a stream of 5% CO2 concentration was obtained, which is 2.7 times that of TETA‐functionalized MCM‐41. The TETA‐modified Zr‐MCM‐41 is 30°C higher than the TETA‐modified MCM‐41 in terms of thermal stability. We find that the former adsorbent is superior in reusability. It is envisaged that the adsorbent is applicable in CO2 capture. © 2015 American Institute of Chemical Engineers Environ Prog, 34: 1814–1821, 2015

We have prepared the hydrophobic aminofunctionalized ionic liquid (IL) 1-(2-aminoethyl)-3-butylimidazolium hexafluorophosphate and investigated its extraction behavior for copper(II) ion as a model cation. The IL, due to the presence of an amino group, is capable of complexing Cu(II) in a ratio of 6:1. The parameters affecting the extraction efficiency were optimized. The IL-based liquid-liquid microextraction was successfully applied to the analysis of Cu(II) in an environmental water standard reference material. The results are promising in terms of liquidliquid microextraction, separation, and preconcentration of Cu(II).