Preparation and enhanced adsorption properties for CO₂ and dyes of amino‐decorated hierarchical porous BCN aerogels

Abstract

Anthropogenic CO 2 emission has an enormous increase in recent decades, which is the most momentous input to the greenhouse effect and leads to a range of environmental concerns such as global warming, sea level rising, desertification, and so on. 1,2 Therefore, CO 2 capture is considered as a great challenge. In addition, nowadays different kinds of dyes are extensively used in numerous fields of up-to-date technology, including textiles, cosmetics, leather, food, paper production, photo electrochemical cells, etc 3,4 The rapid development and wide application of dyes will produce a great quantity of industrial wastewater containing organic substances, which will bring a huge threat to the ecological environment and human health. Hence, the treatment of dyes in wastewater is also of great concern. Adsorption process has the advantages of low energy consumption, high economic benefit, and simple and practicable

Scalable Preparation of Sub-Millimeter Double-Shelled Al2O3 Hollow Spheres and Their Rapid Separation from Wastewater after Adsorption of Congo Red

“…Their isotherms can be classified as type IV, suggesting the shell of the hollow spheres with mesopores. 48 , 49 According to the pore size distribution curve of the two samples (inset in Figure 6 b), it is shown that they have uniform pore size distribution mainly in the range of 2.5–10 nm, which is consistent with the results in Figure 3 . The BET surface area of the double-shelled hollow sphere (509 m 2 /g) is larger than those of the single-shelled hollow spheres (333 m 2 /g), indicating that the presence of two shells in the former contributes to the increase of BET surface areas.…”

Efficient Water Cleaning by Self‐standing Carbon Nitride Films Derived from Supramolecular Hydrogels

“…where q e (mg g −1 ) is the equilibrium adsorption amount, Q 0 (mg g −1 ) is the maximum adsorption amount, b (L mg −1 ) is a constant term related to the energy of adsorption, C e (mg L −1 ) is the equilibrium concentration of dye in the solution, k F and n are the Freundlich constants, k F represents the adsorption capacity of the adsorbent, and n indicates how favorable the adsorption process is (n=2∼10, 1∼2, and <1 indicate good, moderate, and poor adsorption, respectively) [59] …”

“…where q e (mg g À 1 ) is the equilibrium adsorption amount, Q 0 (mg g À 1 ) is the maximum adsorption amount, b (L mg À 1 ) is a constant term related to the energy of adsorption, C e (mg L À 1 ) is the equilibrium concentration of dye in the solution, k F and n are the Freundlich constants, k F represents the adsorption capacity of the adsorbent, and n indicates how favorable the adsorption process is (n = 2 ~10, 1 ~2, and < 1 indicate good, moderate, and poor adsorption, respectively). [59] Photocatalytic activity: The photocatalytic activity was evaluated by carrying out the photodegradation of the MB dye under whitelight irradiation (Bridge lux BXRA-50 C5300; λ > 410 nm). In a typical experiment, MB (20 mL, 10 mg L À 1 ) and the prepared material (20 mg) were mixed in a glass vial in the dark and under continuous stirring until an adsorption-desorption equilibrium was reached.…”

Fibrous Aerogel-Templated Nanostructured Boron Carbon Oxynitride Networks for Preferential Adsorptive Separation of Cationic Dyes

“…The amine-modified hierarchical porous BCN aerogels showed superior adsorption of organic dyes and CO 2 . The carbon doping and amino functionalities in chemically functionalized BCN synergistically improved the adsorption activities and accelerated the dye adsorption kinetics . The structural and electronic changes in h -BN because of C and O doping weakened the B–N linkages and enhanced the electronic polarity.…”