Activated Carbon with Ultrahigh Specific Surface Derived from Bamboo Shoot Shell through K2FeO4 Oxidative Pyrolysis for Adsorption of Methylene Blue

Abstract

To effectively remove methylene blue (MB) from dye wastewater, a novel activated carbon (BAC) was manufactured through co-pyrolysis of bamboo shoot shell and K2FeO4. The activation process was optimized to a temperature of 750 °C and an activation time of 90 min based on its excellent adsorption capacity of 560.94 mg/g with a yield of 10.03%. The physicochemical and adsorption properties of BACs were investigated. The BAC had an ultrahigh specific surface area of 2327.7 cm2/g and abundant active functional groups. The adsorption mechanisms included chemisorption and physisorption. The Freundlich model could be used to describe the isothermal adsorption of MB. The kinetics confirmed that the adsorption of MB belonged to the pseudo-second-order model. Intra-particle diffusion was the main rate-limiting step. The thermodynamic study showed that the adsorption process was endothermic and temperature was beneficial for the improvement of adsorption property. Furthermore, the removal rate of MB was 63.5% after three cycles. The BAC will have great potential for commercial development for purifying dye wastewater.

Turn Waste Golden Tide into Treasure: Bio-Adsorbent Synthesis for CO2 Capture with K2FeO4 as Catalytic Oxidative Activator

“…A very broad peak appears at 3100~3640 cm −1 in all samples, which may be attributed to the O-H and N-H stretching vibration of carboxyl and amine groups, respectively. The strongest peak at 1631 cm −1 corresponds to carbonyl C=O stretching vibration of surface functional groups [ 27 ]. The peaks at 1121 cm −1 correspond to the stretching vibration of the C-O bond.…”

“…Consequently, K 2 FeO 4 has shown distinct advantages in the development of other biomass-based carbon-based materials since 2017. It is widely used for the removal of metal ions, organics, and dyes from wastewater [ 25 , 26 , 27 ] as it not only has the pore-forming ability of the potassium-based component, but also has the catalytic function of graphitization of the iron-based component, which can synergistically regulate the pore structure and enhance the degree of graphitization of the carbon material [ 28 ]. However, most of the existing studies ignored that K 2 FeO 4 has a stronger oxidizing ability than potassium permanganate (KMnO 4 ), which can be used for oxidative modification of biomass-based carbon materials to increase the number and type of surface functional groups in order to improve the adsorption capacity.…”

Effect of Deashing Treatment on Ash Fusion Characteristics of Biochar from Bamboo Shoot Shells

“…Bamboo shoot shells (BSSs) are waste in the production process of bamboo shoots. Different from some agricultural wastes, such as rice husks and straw, BSSs have a high moisture content and are rich in peptides and amino acids [ 22 ], which makes them perishable and liable to cause environmental pollution [ 23 ]. It has been found that biochar from bamboo shoot shells (BBSSs) with a high calorific value has a great application prospect in the field of biomass energy.…”