Green Carbon Material for Organic Contaminants Adsorption

Abstract

Eco-friendly and economical adsorbents are desirable for removing organic pollutants from the environment. Herein, a kind of green carbon material, electrolytic carbon (EC) prepared by the electrochemical conversion of greenhouse gas (CO 2 ) in molten carbonate, is verified as an effective adsorbent for aniline and other small aromatic organic molecules. The EC consists of nanoparticles and nanoflakes, featuring the specific surface area of ∼641 m 2 /g with an enriched micropore structure. It exhibits a large adsorption capacity (Q max > 114.1 mg/g) for aniline, especially in water with a lower contamination level. The adsorption conforms to the pseudo-second-order equation kinetically and the Freundlich model thermodynamically in the temperature range of 303−323 K. Moreover, it is found that the adsorption performance of the material can be further improved through reducing surface oxygen functional groups by a simple thermotreatment. Its adsorption capacity for aniline is enhanced by 1.7 times, demonstrating that the π−π dispersive interaction plays a primary role for the efficient adsorption. This adsorption mechanism is further confirmed by the excellent adsorption performance of the carbon materials for other analogue aromatic compounds (phenol, nitrobenzene). The super performance of the CO 2 -derived carbon adsorbents will be helpful for capturing CO 2 as well as for removing organic pollutants.

Rapid and efficient removal of multiple aqueous pesticides by one-step construction boric acid modified biochar

“…Thermodynamic parameters include standard Gibbs free energy change (Δ G 0 ), standard enthalpy change (Δ H 0 ), and standard entropy change (Δ S 0 ), the equation is as follows:Δ G 0 = − RT ln K 0 Δ G 0 = Δ H − T Δ S 0 where R (8.314 J mol −1 K −1 ) is the universal gas constant, T (K) is the absolute temperature, and K 0 (dimensionless) is the equilibrium constant. 42…”

Properties and the Application of Sludge-Based Biochar in the Removal of Phosphate and Methylene Blue from Water: Effects of Acid Treating

“…Carbonaceous materials have become a kind of efficient and widely used adsorbent. 6 However, the use of commercial carbonaceous materials is limited by their high cost. Therefore, the sludge-based biochar could be a potential substitution in removing pollutants from water.…”

“…Adsorption is a commonly used method in water remediation. Carbonaceous materials have become a kind of efficient and widely used adsorbent . However, the use of commercial carbonaceous materials is limited by their high cost.…”

CO2‐Derived Oxygen‐Rich Carbon with Enhanced Redox Reactions as a Cathode Material for Aqueous Zn‐Ion Batteries

“…[11] Also, different from the electrocatalysis that converts CO 2 into liquid fuel, MSCC-ET can transform CO 2 into solid carbon products with controllable morphology, composition and surface functional group, which endows them with great potential in the fields of energy storage, catalysis, and environmental remediation. [12] For example, Jiang et al prepared carbon material with a high specific surface area by the molten salt electrolysis method, [13] which showed a large adsorption capacity of 114.1 mg g À 1 for aniline and fast adsorption rate of completing 65 % adsorption capacity within one minute. Furthermore, S and Co doubledoped electrolytic carbon synthesized by MSCC-ET method was also reported by Chen et al [14] It showed comparable electrocatalytic activity with Pt/C catalyst on oxygen reduction reaction, but better cycling stability.…”