Potassium citrate-derived porous carbon with high CO2 capture and Congo red adsorption performance

Abstract

The objective is to achieve the goal of carbon neutrality, controlling CO2 emissions is a primary problem to be solved in the current environmental protection field. Eliminating the environmental pollution of dyes in industrial wastewater is also an urgent problem to be solved in the field of environmental protection. The adsorption technique is an effective way to deal with these two issues. Developing high-efficiency adsorbents is an essential work in the adsorption field. In this work, a simple carbonization method has been developed to prepare porous carbon. The morphology and structure of the prepared porous carbon were investigated by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and surface area measurement. By studying the influence of preparation conditions on the structure and properties of the prepared carbon materials, it was found that the carbon materials prepared at 900 ℃ (PCMCA-900) exhibited a high specific surface area of 1476 m2 g−1 and a high total pore volume of 0.951 cm3 g−1. The PCMCA-900 showed the highest CO2 uptake of 7.67 mmol g−1 at 0 ºC and the adsorption capacity of PCMCA-900 decreased by less than 5% after 10 times recycling. Moreover, when PCMCA-900 was used as an adsorbent to remove Congo red in water, an adsorption capacity of 652.3 mg g−1 was achieved. Therefore, potassium citrate-derived porous carbon is a desirable candidate for excellent CO2 adsorption and Congo red in industrial wastewater.

Selective Adsorption of Methyl Orange and Methylene Blue by Porous Carbon Material Prepared From Potassium Citrate

“…As shown in Figure 3 (a), PC-700, PC-800, and PC-900 showed typical type-I isotherms, indicating the presence of micropores in their structures. 30 At a low relative pressure ( P / P 0 < 0.05), the N 2 isotherm exhibited a sharp increase, which meant abundant micropores in the carbon material. Besides, compared with PC-700 and PC-800, PC-900 showed a higher N 2 adsorption capacity, which meant that there were more microporous structures in PC-900.…”

“…The specific surface area and the pore structures of the prepared porous carbon materials were tested by the N 2 adsorption/desorption method. As shown in Figure (a), PC-700, PC-800, and PC-900 showed typical type-I isotherms, indicating the presence of micropores in their structures . At a low relative pressure ( P / P 0 < 0.05), the N 2 isotherm exhibited a sharp increase, which meant abundant micropores in the carbon material.…”

“…With the maturity of fermentation technology for preparing citric acid, the utilization of potassium citrate has also attracted increasing attention . Porous carbon materials prepared from potassium citrate have shown promising application potential in fields such as supercapacitors, carbon capture and storage, and adsorbents. − Herein, potassium citrate was used to obtain porous carbon materials by a calcination method. The influence of the calcination temperatures on the adsorption capacity of the prepared porous carbon samples was compared.…”

Production of combustible fuels and carbon nanotubes from plastic wastes using an in-situ catalytic microwave pyrolysis process

“…They reported that this catalyst is highly efficient, environmentally friendly and low-cost compared to other catalysts. Wang et al 12 derived porous carbon from potassium citrate for CO 2 capture and dye adsorption applications. In pyrolysis, the catalyst drives the rate of cracking, which results in a rapid increase in gas production with decreased liquid oil.…”

Formation Mechanism of a Hierarchically Porous Carbon Based on Soybean Hull Residues and Its Adsorption Performance

“…[16,17] It could not only increase economic benefits but also reduce environmental pollution. [18] At the moment, porous materials made from biomass and other materials were getting more attention, for instance, porous carbon materials made from potassium citrate, [19] nitrogen-doped hierarchical porous carbon generated from silkworm cocoon waste as reliable electrode materials for effective capacitive desalination, [20] by utilizing the sodium polyacrylate in applied diaper waste, pyrolysis can be exploited to create porous material, [21] porous carbon obtained from cattail grass as a high-capacity anode material, [22] the wetimpregnation and calcination approach was employed to manufacture the heterogeneous magnetic catalyst for the synthesis of biodiesel using waste diapers as the raw material. [23] As major by-product of soybean processing industries, soybean hulls residue (SHR) is a kind of typical natural polymer waste.…”