Biochar-supported zero-valent iron enhanced arsenic immobilization in a paddy soil: the role of soil organic matter

Biochar, Год журнала: 2024, Номер 6(1)

Опубликована: Март 19, 2024

Abstract Arsenic (As) detoxification in polluted soils by iron-based materials can be mediated the endogenous soil organic matter (SOM), nevertheless mechanisms remain unclear. Herein, SOM a paddy was substantially removed to understand its roles on As immobilization biochar-supported zero-valent iron (ZVI/BC). The results demonstrated that ZVI/BC application significantly decreased bioavailability 64.2% compared with control under anaerobic condition. XPS and HR-TEM suggested mainly invoked formation of ternary complexes (i.e., As-Fe-SOM). However, depletion compromised efficacy for 289.8%. This is likely because increased fulvic acid OH − contents soils. Besides, proportion As(III) available fraction, but altered associated As(V) reduction. That is, reduction resulted from reductive capacity ZVI pristine soil, As(V)-reducing bacteria contributed greater SOM-depleted soil. Additionally, boosted abundances Fe(III)- such as Bacillus Ammoniphilus soils, which enhanced dissimilatory arsenate Thus, this work highlighted importance remediation As-contaminated ZVI/BC. Graphical

Язык: Английский

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Synergistic effect between biochar and sulfidized nano-sized zero-valent iron enhanced cadmium immobilization in a contaminated paddy soil

Biochar, Год журнала: 2024, Номер 6(1)

Опубликована: Июнь 3, 2024

Abstract Biochar-based sulfidized nano-sized zero-valent iron (SNZVI/BC) can effectively immobilize cadmium (Cd) in contaminated paddy soils. However, the synergistic effects between biochar and SNZVI on Cd immobilization, as well underlying mechanisms remain unclear. Herein, a soil microcosm incubation experiment was performed to investigate immobilization performance of SNZVI/BC towards soil. Results indicated that addition at dosage 3% significantly lessened concentration available from 14.9 (without addition) 9.9 mg kg −1 with an efficiency 33.3%, indicating effect. The sequential extraction results proportion residual increased 8.1 10.3%, manifesting transformation unstable fractions steadier specie after application SNZVI/BC. Also, pH, organic matter, dissolved carbon, which altered bacterial community soil, enriching relative abundances functional microbes (e.g., Bacillus , Clostridium Desulfosporosinus ). These microorganisms further facilitated generation ammonium, nitrate, ferrous enhancing nutrients’ availability. direct interaction 2+ physicochemical properties, responded played important roles Overall, biochar-based is promising candidate for effective improvement availability Graphical

Язык: Английский

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Remediation of Cadmium‐Contaminated Paddy Soils by Phosphorite Magnetic Biochar: A New Insight Into Soil Microbial Responses

Land Degradation and Development, Год журнала: 2025, Номер unknown

Опубликована: Март 6, 2025

ABSTRACT Cadmium (Cd)‐contaminated rice paddies have been a primary environmental concern worldwide. Biochar or modified biochar application favors reducing Cd availability in paddy soil, which has demonstrated physical and chemical terms. However, we know little about soil microbial responses after application. In this study, revealed the immobilization effect mechanism of fields by novel phosphorite magnetic (PMCB) from perspective response. The results suggested that PMCB facilitated conversion highly active to less reduced uptake improving physicochemical properties functional bacterial gene abundance. Compared with control, acetic acid extractable reducible contents content brown decreased 7.4%–18.4%, 16.2%–19.9%, 44.0%–47.9%, respectively, residual increased 16.3%–25.8% under treatment. A decrease sqr fccB abundances (downregulated 6.3% 12.4%, respectively) inhibited CdS oxidative dissolution 0.2% Conversely, other treatments stimulated abundant proliferation microbes (e.g., Anaeromyxobacter , Geobacter Thiobacillus ) these genes while suppressing sulfide‐producing abundance (sreA phsA 30.5%–73.4% 3.3%–11.3%, respectively). This result implies Fe(III) mineral reduction oxidation lead limited secondary release Cd. Additionally, aqueous‐phase analysis immobilized mainly coprecipitation PO 4 3− CO 3 2− (34.5%) ion exchange (32.2%), followed surface complexation (18.7%) cation π‐bonding (13.1%).

Язык: Английский

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High performance self-assembled sulfidized nanoscale zero-valent iron for the immobilization of cadmium in contaminated sediments: Optimization, microbial response, and mechanisms

Journal of Hazardous Materials, Год журнала: 2024, Номер 469, С. 134022 - 134022

Опубликована: Март 12, 2024

Язык: Английский

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Assessment of biochar supported sulfidized iron-based nanoparticles for immobilization of cadmium in sediment: Effectiveness, contribution of iron reducing bacteria, and mechanism insight

Journal of Cleaner Production, Год журнала: 2024, Номер 467, С. 143026 - 143026

Опубликована: Июнь 25, 2024

Язык: Английский

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Quantification of the effect of biochar application on heavy metals in paddy systems: Impact, mechanisms and future prospects

The Science of The Total Environment, Год журнала: 2023, Номер 912, С. 168874 - 168874

Опубликована: Ноя. 28, 2023

Язык: Английский

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Ectomycorrhizal plant-mediated carbon fixation and microbial mechanisms of organic carbon stabilization in coastal saline soils

Journal of Soils and Sediments, Год журнала: 2025, Номер unknown

Опубликована: Янв. 22, 2025

Язык: Английский

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Phosphorus-loaded magnetic biochar for remediation of cadmium contaminated paddy soil: Efficacy and identification of limiting factors

Journal of Hazardous Materials, Год журнала: 2025, Номер unknown, С. 138162 - 138162

Опубликована: Апрель 1, 2025

Язык: Английский

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Reduction of antimony bioavailability with the application of stable exogenous organic matter: a comparative study between rice straw and manure compost

Environmental Research, Год журнала: 2025, Номер unknown, С. 121578 - 121578

Опубликована: Апрель 1, 2025

Язык: Английский

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Magnetism of some Egyptian soils affecting their response to the magnetized water

Pedosphere, Год журнала: 2025, Номер unknown

Опубликована: Апрель 1, 2025

Язык: Английский

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