Effective removal of aqueous glyphosate using CuFe₂O₄@biochar derived from phragmites

Abstract

BACKGROUND: The excess use of glyphosate in both agricultural and nonagricultural areas has led to tremendous health (e.g. cardiac and respiratory impacts) and environmental concerns worldwide. There is an urgent need to find efficient ways to remove glyphosate residue from the aqueous environment. RESULTS: Herein, an effective method for the removal of aqueous glyphosate is developed by employing nano-CuFe 2 O 4 modified biochar (BC) as an adsorbent. The CuFe 2 O 4 @BC adsorbents were prepared through hydrolyzing phragmite powders at 500 ∘ C, followed by a simple coprecipitation method. The influence of initial glyphosate concentration, temperature, pH, time and coexisting species on the adsorption behavior of CuFe 2 O 4 @BC to glyphosate were fully examined. CONCLUSION: It was found that the adsorption of glyphosate onto CuFe 2 O 4 @BC is highly dependent on the initial glyphosate concentration, pH and temperature, as well as coexisting species. The Freundlich and Langmuir models fitted the equilibrium isotherm data well, indicating the presence of both physisorption and chemisorption. In addition, the adsorption kinetic is well described by the pseudo-second-order kinetic model, which indicated that chemical adsorption may dominate the adsorption process. The CuFe 2 O 4 @BC adsorption of glyphosate presented a maximum adsorption capacity of 269.4 mg g −1 within 240 min, under 600 mg L −1 of glyphosate solution at 298 K and pH 4; this performance exceeds all other biochar-derived adsorbents for the removal of aqueous glyphosate encountered in the open literature. Such a cost-effective, high-performance adsorbent shows a great potential for the removal of aqueous glyphosate in industry. Regeneration testThe CuFe 2 O 4 @BC adsorbents were regenerated via a NaOH (0.5 mol L -1 ) rinsing method: they were collected via filtration and J Chem Technol Biotechnol 2020; 95: [196][197][198][199][200][201][202][203][204]

MIL-101(Fe) Metal–Organic Framework Nanoparticles Functionalized with Amino Groups for Cr(VI) Capture

“…Comparing the values obtained using both models, the R 2 values obtained using the pseudo-second-order model are higher than those obtained using the pseudo-first-order model and that the q e exp values agree well with the q e cal values using the pseudo-second-order model (Table ). Both parameters strongly suggest that the adsorption process of Cr­(VI) by five adsorbents follows a pseudo-second-order model at different concentrations, suggesting that the chemisorption process is the rate-limiting step …”

“…Both parameters strongly suggest that the adsorption process of Cr(VI) by five adsorbents follows a pseudo-second-order model at different concentrations, suggesting that the chemisorption process is the rate-limiting step. 55 DFT Calculations. In general, the Fe atom is the most favored adsorption site, consistent with our calculated results, where the major adsorption site was identified as the Fe center.…”

Treatment technologies and degradation pathways of glyphosate: A critical review

“…Furthermore, the chemical modification method can effectively modify biochar surface properties to obtain high adsorption performance. Jia et al (2020) found a higher maximum adsorption capacity of glyphosate of 269 mg.g −1 by nano-CuFe 2 O 4 modified biochar prepared by a coprecipitation method.…”

Investigation of glyphosate removal from aqueous solution using calcium peroxide

“…Adequate evidence exists to support that Fenton system including combination coupling Fenton system (i.e., electro-Fenton, adsorption-Fenton, photo-Fenton processes, and Fenton-like system) is significantly efficient. This is due to shorter contact time and fewer by-products on glyphosate removal under Fenton system [3]. Thus far, the major problem has received attention that it is quite challenging and inconvenient to store and transport liquid hydrogen peroxide (H 2 O 2 ) [4].…”