Preparation and Characterization of Unactivated, Activated, and γ-Fe2O3 Nanoparticle-Functionalized Biochar from Rice Husk via Pyrolysis for Dyes Removal in Aqueous Samples: Comparison, Performance, and Mechanism

ChemEngineering, Journal Year: 2025, Volume and Issue: 9(2), P. 30 - 30

Published: March 10, 2025

This study aimed at preparing three types of biochar derived from rice husk via pyrolysis, including unactivated biochar, chemically activated after with H3PO4, and impregnated γ-Fe2O3 nanoparticles. These materials were subsequently characterized using Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), Brunauer–Emmett–Teller (BET) analysis, which revealed favorable textural properties, such as an increased surface area porosity, well the presence functional groups that facilitate adsorption methylene blue malachite green in aqueous solutions. Several factors affect capacity, type material, pH effect, adsorbent dosage, evaluated optimized. The behavior was analyzed isotherm kinetic models to better understand mechanisms involved. Under optimal conditions, biochar@γ-Fe2O3 NPs emerged most effective material due its high area, functionalized surface, magnetic allowing easy water recovery without need for complex instrumentation. Among evaluated, pseudo-second-order model exhibited highest linear regression coefficient (R2 = 0.99), supporting a chemisorption process driven by strong interactions stable chemical bond formation between adsorbate adsorbent, while equilibrium data fit Sips model, indicating combination monolayer multilayer mechanisms. achieved removal efficiencies 97% 95% green, demonstrating performance reusability over four cycles. Moreover, possible mechanism MB on proposed explain interaction dye surface. Thus, this work demonstrates is sustainable cost-effective wastewater treatment, integrating circular economy principles transforming into high-value material. incorporation nanoparticles enhances enabling recovery, providing eco-friendly scalable solution removal.

Language: Английский

Multifaceted Applications of Dye-Saturated Biochar: Agronomic Amelioration, Thermochemical Valorization, and Catalytic Efficacy in Advanced Environmental Remediation Paradigms

Cleaner Chemical Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 100164 - 100164

Published: March 1, 2025

Language: Английский