Preparation of carbon black‐based porous carbon adsorbents and study of toluene adsorption properties

Abstract

Background Carbon black, which has a low utilization rate, is a powdered carbon material produced by incomplete combustion or decomposition of hydrocarbons. Carbon black is used in rubber, coating and ink industries, the product quality will be affected due to its powder structure, and serious environmental pollution will be caused in the stacking process. However, carbon black used as the raw material for the preparation of porous carbon materials with high volatile organic compounds (VOCs) adsorption capacity, which can realize the resource utilization of carbon black and environmental protection. Results Porous carbon based adsorbents (PCBAs) were prepared by low‐temperature physical pore‐forming and high‐temperature chemical pore‐forming with waste carbon black as raw material and (NH4)2CO3 as pore‐forming agent. The high pore‐forming temperature was beneficial to the pore structure to be formed. The surface morphology of the prepared PCBAs was more wrinkled and loose, and the specific surface area, micropore ratio and graphitization degree showed a volcanic change trend with the increase of pore‐forming temperature. The micropore ratio reached the maximum (81.7%) and the graphitization degree reached the maximum (ID/IG = 1.15) at the pore‐forming temperature of 850 °C. When the pore‐forming temperature was 850 °C, the toluene saturated adsorption capacity of PCBA850 adsorbent was 298.9 mg/g. In addition, the kinetic fitting results show that the adsorption behavior of toluene molecules on the adsorbent is mainly affected by the pore diffusion. Conclusion Although increasing pore‐forming temperature did not change the surface chemical properties of PCBAs, high temperature pore‐forming could significantly increase the microporosity and surface area of PCBAs. The high microporous ratio and specific surface area can provide more active sites for toluene adsorption, thus improving the toluene adsorption performance of the porous carbon‐based adsorbent. In addition, the PCBA adsorbent prepared at 850 °C can restore the toluene adsorption performance at 120 °C, which provides a possibility for its practical application. © 2022 Society of Chemical Industry (SCI).

Mechanism and preparation research of binary heteroatom co-doped (X = N, S, P) platinum/carbon black electrocatalysts for an enhanced oxygen reduction reaction via a one-pot pyrolysis method

“…2a and Table 1) was used to evaluate the degree of graphitization and defect density of the carbon materials. 22,23 The addition of melamine prior to pyrolysis improved the graphitization and conductivity of the carbon materials, with N atoms lling some of the defect sites on the carbon support. Upon adding ammonium dihydrogen phosphate and subsequent pyrolysis, higher graphitization was achieved; however, the formation of larger PtP 2 compound particles occupied more defect sites.…”

Preparation and Adsorption Performance Study of Graphene Quantum Dots@ZIF-8 Composites for Highly Efficient Removal of Volatile Organic Compounds

“…These structures not only possess a high specific surface area, but also maintain high cycle stability, as shown in Figure 11, which make the GQDs@ZIF-8 composite an ideal candidate for the highly efficient removal of VOCs. The adsorption capacity and adsorption rate of previous adsorbents for toluene and ethyl acetate are shown in Figure 12 [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59]. Compared with other adsorbents, the GQDs@ZIF-8 composites exhibit excellent performance both in adsorption capacity and in removal percentage due to their unique nano-micro hierarchical pore structures generated from the optimized matching of GQDs and ZIF-8.…”

Dynamic Worm-Gel Materials as Tunable, Regenerable Adsorbents for Water Treatment

“…Porous carbon-based adsorbents, such as activated carbon, are commonly employed in water treatment applications to physisorb soluble pollutants from water. – Although these adsorbents are both effective and cost-efficient, there are some drawbacks that warrant consideration. The limited synthetic tunability of activated carbon presents challenges in targeting specific contaminants in complex aqueous media.…”