Detection of carbon dioxide with a novel HPTS/NiFe-LDH nanocomposite

• Novel HPTS/NiFe-LDH nanocomposite was synthesized using a hydrothermal method.
• The nanocomposite can be employed as a sensor to selective discriminate CO2 gas.
• A new approach to detection of carbon dioxide is introduced with a composite.

Carbon dioxide (CO2) is a major greenhouse gas, which is considered as a leading contributor to global warming and climate change. Therefore, the detection of CO2 is highly important and beneficial for many applications. Layered double hydroxide (LDH) is considered as a good adsorbent for CO2 with high adsorption selectivity and capacity. However, the adsorption capacities of CO2 on LDH are usually investigated at high temperatures. And CO2 adsorption is measured with bulky instrumentation, which exist the problems of high cost, long cycle, complicated test processes and unsuitability for real-time measurements of CO2 gas. Herein, a new approach to rapid CO2 detection is introduced using a novel HPTS/NiFe-LDH nanocomposite (8-hydroxypyrene-1,3,6-trisulfonicacid trisodium, HPTS) through a facile fluorescence technology at room temperature. In this paper, HPTS/NiFe-LDH nanocomposite was firstly synthesized through a facile one-step hydrothermal method. The HPTS/NiFe-LDH nanocomposite had no fluorescence with anionic dye HPTS intercalated into the cationic interlayer of NiFe-LDH. When CO2 gas was gradually bubbled into the above system, CO32− ions were then intercalated into the interlayer of NiFe-LDH and anionic dye was released from NiFe-LDH, thereby leading to the fluorescence recovery of HPTS. The results indicated that fluorescence intensity was linearly related to the bubbling volumes of CO2, suggesting that the HPTS/NiFe-LDH nanocomposite can be used as a sensor to selectively discriminate CO2 gas, which provided not only a new route to rapidly detection of CO2 but also a new application field of the hybrid LDH composites.

A novel HPTS/NiFe-LDH nanocomposite has been developed and used as a sensor to selective discriminate CO2 gas by using a facile fluorescence technology at room temperature.Figure optionsDownload as PowerPoint slide