Adsorption of Cu(II) and Pb(II) in Aqueous Solution by Biochar Composites

ACS Omega, Journal Year: 2025, Volume and Issue: 10(14), P. 13816 - 13828

Published: April 2, 2025

In this study, straw biochar (TB) was prepared by pyrolysis at 500 °C, and composite material (TBS) a 1:4 mass ratio with sludge (TS). Scanning electron microscopy Fourier transform infrared spectroscopy were utilized to characterize the before after adsorption. The results demonstrated that TBS possesses significant pore structure characteristics abundant active functional groups such as hydroxyl, carboxyl, carbonyl groups, providing structural basis for its efficient adsorption of heavy metal ions in aqueous solutions. performance remediation materials Cu(II) Pb(II) solution systematically investigated. Experimental data showed achieved maximum capacities 60.86 46.98 mg/g equilibrium, respectively, exhibiting superior efficiency. Through fitting analysis using kinetic models isothermal models, it found pseudo-second-order model Freundlich could more accurately describe process two ions, indicating chemical dominant mechanism characterized multilayer Thermodynamic parameter calculations revealed negative ΔG values positive ΔH ΔS values, suggesting spontaneous, entropy-increasing, endothermic reaction. These research fully validate excellent removal capabilities Pb(II). This study has shown can be considered promising cost-effective adsorbent, demonstrating potential adsorb water.

Language: Английский

---

Analysis of the Solar Pyrolysis of a Walnut Shell: Insights into the Thermal Behavior of Biomaterials

Energies, Journal Year: 2024, Volume and Issue: 17(6), P. 1435 - 1435

Published: March 16, 2024

The state of Sonora, Mexico, stands as one the leading producers pecan nuts in country, which are commercialized without shells, leaving behind this unused residue. Additionally, region has abundant solar resources, shown by its high levels direct normal irradiance (DNI). This study contributes to research efforts aimed at achieving a synergy between concentrated energy technology and biomass pyrolysis processes, with idea using advantages organic waste reduce greenhouse gas emissions avoiding combustion conventional through concentration thermal energy. objective is pioneer new experimental analysis methodology on reactors. two main features are, firstly, comparison temperature profiles during heating inert reactive materials and, secondly, rates. facilitated better interpretation observed phenomenon. encompasses different experiments: (A) shells (B) heating–cooling process biochar produced experiment (A). an involving volcanic stone presented, reveals material serves comparative reference (B). In study, 50 g were subjected within cylindrical stainless-steel reactor volume 156 cm3, heated radiation from simulator. Three heat fluxes applied (234, 482, 725 W), resulting maximum reaction temperatures 382, 498, 674 °C, respectively. Pyrolysis analyses (H2, CO, CO2, CH4) characterization obtained conducted. rates, both for pyrolysis, identification, differentiation, processes such moisture evaporation, tar production endpoint, cellulosic lignin degradation. proved be valuable tool it revealed cooling patterns that not previously identified. potential implications would associated improvements design operation protocols

Language: Английский

---

Adsorption of Cu(II) and Zn(II) onto ZrO2–SiO2 composite: Characteristics, mechanism and application in wastewater treatment

Desalination and Water Treatment, Journal Year: 2024, Volume and Issue: 320, P. 100657 - 100657

Published: July 30, 2024

The presented paper describes a perspective methodology of hazardous post-production wastewater treatment focused on recovering selected metal ions species, mainly copper, zinc, and arsenic. idea included the design multifunctional adsorbents composed zirconia silica, their physicochemical evaluations, verification tests in adsorption process performed using model wastewaters. proposed synthesis protocol allowed to obtain materials with unique structural properties, including well-developed surface area (ABET = 398 m2∙g−1), as well specific nature. It was confirmed by results energy dispersive X-ray, X-ray fluorescence Fourier transform infrared spectroscopy analyses. Furthermore, analysing batch experiments, optimal parameters for analyzed were established follows: T 313 K, pH 5, S:L ratio 6.67 mg:cm3, t 120 min. found that removal ion species followed pseudo-second-order kinetic Langmuir isotherm models, estimated sorption capacity designed material 23.5 mg∙g−1 12.4 Cu(II) Zn(II) ions, respectively. indicate it is possible separate arsenic compounds from copper zinc efficiencies 98.9 % 99.5

Language: Английский

---

Residues from the Oil Pressing Process as a Substrate for the Production of Alternative Biochar Materials

Applied Sciences, Journal Year: 2024, Volume and Issue: 14(17), P. 8028 - 8028

Published: Sept. 8, 2024

The purpose of this study was to evaluate the feasibility using residues from cooking oil production produce alternative biochar fuels along with optimizing pyrolysis process. work consisted carrying out process at varying temperatures and holding times final temperature, then evaluating energy potential materials studied. Taking into account aspects environmental emissions, content selected oxides in flue gases generated during combustion cakes obtained them evaluated. Plant biomass derived a variety oilseeds, i.e., fennel flower (Nigella sativa L.), rapeseed (Brassica napus L. var. Napus), flax (Linum usitatissimum evening primrose (Oenothera biennis milk thistle (Silybum marianum Gaertn.) hemp (Cannabis used biochar. experimental data have shown that can calorific value nearly 27 MJ kg−1. use allowed for maximum increase 41% compared non-thermally processed several-fold decrease carbon monoxide, nitrogen sulfur dioxide emissions. According these results, it be concluded an attractive method various oils biofuels, developing circular economy.

Language: Английский

---

Futuristic augmentation of various industrial wastes for the green recovery of high-valued metal ions

Elsevier eBooks, Journal Year: 2024, Volume and Issue: unknown, P. 393 - 447

Published: Nov. 15, 2024

Language: Английский

---