Preparation of Phosphorus-Doped Boron Nitride Aerogel and Its Heavy Metal Ion Adsorption Properties
Journal Title: Energy Environmental Protection - Year 2025, Vol 39, Issue 2
Abstract
This study developed phosphorus-doped boron nitride aerogel (P-BN) through a sol-gelmethod combined with low-dimensional boron nitride (BN) assembly, aiming to address the critical challenge of removing heavy metal ions in industrial wastewater. Structural characterization using X-ray photo electron spectroscopy (XPS) and synchrotron X-ray absorption fine structure (XAFS)demonstrated that phosphorus doping introduced P—O—C and P—O functional groups, increased the interlayer spacing of BN from 0.334 nm to 0.347 nm, and enhanced mesopore volume by 32.7%.Nitrogen adsorption-desorption isotherms further revealed a specific surface area of 465.4 m/g and anultralight bulk density of 0.80 mg/cm, significantly lower than that of the undoped BN (1.24mg/cm). Adsorption experiments conducted at 25 ℃ showed that P-BN exhibited a Cu adsorption capacity of 413.3 mg/g, outperforming BN by 14.4%, with maximum capacities for Energy Environmental Protection Zn, Cd, and Pb reaching 338.5, 253.9, and 234.8 mg/g, respectively. Kinetic analysis indicated that the adsorption process followed pseudo-second-order kinetics (R > 0.985) for P-BN, driven bychem isorption via coordination bonds between metal ions and PO groups, whereas BN adheredto pseudo-first-order kinetics (R > 0.996), indicative of physical adsorption. The Langmuir isothermmodels (R > 0.990) confirmed monolayer adsorption in both materials. Competitive adsorption tests inmixed solutions highlighted the selectivity of P-BN for Cu, with a selectivity coefficient α(Cu/Pb)of 2.17, which was attributed to d-orbital electron interactions between Cu and P—O groups.Thermodynamic studies identified 25 ℃ as the optimal temperature, beyond which the adsorption capacity decreased due to accelerated desorption kinetics. The superior adsorption performance of P-BN was attributed to three synergistic effects: (1) phosphorus-induced active sites accelerating surface reactions, (2) optimized mesoporous structure (average pore size reduced to 2.9 nm from 3.4 nmin BN) enhancing ion diffusion, and (3) stabilized coordination environments via P—O bonding.Furthermore, the scalable synthesis using low-toxicity precursors (boric acid, melamine, and redphosphorus) and the ultralight density of the material <1 mg/cm enable cost-effective fabrication and integration into dynamic filtration systems for large-scale wastewater treatment. Future research will focus on pilot-scale validation of long-term stability and mechanistic studies to elucidate the selective adsorption pathways in complex multi-ion environments.
Authors and Affiliations
Junzhong ZHANG,Zheng LIU,Bo LIU,Yanlong LI,
Keywords
Related Articles
- EP ID EP764931
- DOI 10.20078/j.eep.20240713
- Views 18
- Downloads 0
Research on the quantitative assessment of the carbon footprint of domestic waste incineration power generation
In recent years, waste incineration power generation has become one method for domestic waste treatment. The carbon footprint can provide a quantitative tool for evaluating greenhouse gas emissions from this process. A t...
Research progress on low-concentration CO_2 capture by porous solid-phase adsorption materials
To alleviate the increasingly severe global warming problem and achieve carbon neutrality goals, the carbon capture, utilization, and storage (CCUS) technology has attracted widespread attention as an important breakthro...
Preparation of Nitrogen-Doped Carbon-Supported Co-V Catalyst for Catalystic Depolymerization of Lignin to Produce Monophenolic Compounds
Lignin, a renewable biomass component, holds promise as a fossil fuel alternative through its depolymerization into monophenolic compounds for liquid fuel production. However, its complex chemical structure presents sign...
Recent advances on the recovery and high-value utilization of valuable metals from cathode materials of spent lithium-ion batteries
Lithium-ion batteries have emerged as primary power sources for mobile electronic devices and electric vehicles due to their distinctive advantages, including high energy density and extended cycle life. Improper disposa...
Efficient degradation of common dyes by the combination of UV-LED and periodate
To address the issue that dyes are recalcitrant to hydrolysis and conventional water treatment strategies, an ultraviolet light-emitting diode (UV-LED)/periodate (PI) advanced oxidation process was developed for dye remo...