Activated carbons prepared from biogas residue: characterization and methylene blue adsorption capacity

Abstract

BACKGROUND: In China, some biogas residue, which cannot be utilized by microbes in the anaerobic process, has been used as fertilizer. More has been deposited in biogas plants or on land around the plants. This has an effect on the environmental protection of the biogas plant, especially if the high lignin content in the biogas residue is not handled properly.

New opportunities for agricultural digestate valorization: current situation and perspectives

“…Due to emerging environmental pollution problems, the world consumption of activated carbons has dramatically increased these past decades. However, for many countries, the commercially available activated carbons are still considered as expensive materials due to the use of non-renewable and expensive raw materials such as coal 159 . Unused digestates can offer an ideal source for the production of low cost value added ACs 159 .…”

Novel paper‐templated fabrication of hierarchically porous Ni–Al layered double hydroxides/Al2O3 for efficient BSA separation

“…The slightly increased adsorption rate may be attributed to the high number of unsaturated adsorption sites of composites at low concentration BSA solution. To further understand the sorption kinetics, the kinetic models, namely the pseudo‐first‐ order equation, pseudo‐second‐order equation and intraparticle diffusion, were selected to describe the experimental data. By fitting the kinetic models, the pseudo‐second‐order equation fitted the experimental data well as shown by the high correlation coefficients (R 2 > 0.98); the corresponding modeling results are shown in Fig.…”

Synthesis of magnetically separable MnFe₂O₄ nanocrystals via salt-assisted solution combustion method and their utilization as dye adsorbent

“…Therefore, various adsorbents are investigated in the field of environment and materials science, such as active carbon, composite adsorbent and molecular sieves. 5), 6) In order to solve the problem of separation and high cost, magnetic separation is considered as an effective technique of separation adsorbents from wastewater. 7) Spinel-type ferrites have been widely investigated because of their outstanding superparamagnetic behavior and high saturation magnetization properties, i.e., ZnFe 2 4 exhibits an excellent ferromagnetic behavior at room temperature and been widely studied for its magnetic properties.…”