Biochar and biochar-polylactic acid composite enhance biodegradation of hexachlorobenzene in soil by altering microbial community

Fan, Jianling; Liu, Cuiying; Guo, Dengwei; Han, Lu; Zhang, Chuanhong; Jin, Hao

doi:10.1016/j.apsoil.2022.104521

Cited by 4 publications

(3 citation statements)

References 55 publications

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“…belonging to the phylum Aspergillus were significantly higher in comparison with the CK and BC treatments; meanwhile, the functional characteristics of “carbohydrate metabolism,” “amino acid metabolism,” “cofactor and vitamin metabolism,” “lipid metabolism,” “signal transduction,” “xenobiotic degradation and metabolism” and “transport and sorting degradation” were higher in PBC than in BC than in the CK and BC treatments in the same soils. Characteristics were more common in PBC than in BC and CK (p < 0.05) ( Fan et al, 2022 ). Biochar and its composites act as pH buffers in the water column to maintain a suitable environment for the growth of dehalogenating bacteria and the modified biochar has higher electrochemical activity and richer reactive groups than the precursor, which influences and facilitates the electron transfer process and anaerobic respiratory energy metabolism process of dehalogenating bacteria ( Song et al, 2024 ).…”

Section: Synergistic Microbial Treatment Of Biochar and Its Compositesmentioning

confidence: 99%

Biochar, microbes, and biochar-microbe synergistic treatment of chlorinated hydrocarbons in groundwater: a review

Niu,

Li,

Gao

et al. 2024

Front. Microbiol.

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Dehalogenating bacteria are still deficient when targeted to deal with chlorinated hydrocarbons (CHCs) contamination: e.g., slow metabolic rates, limited substrate range, formation of toxic intermediates. To enhance its dechlorination capacity, biochar and its composites with appropriate surface activity and biocompatibility are selected for coupled dechlorination. Because of its special surface physical and chemical properties, it promotes biofilm formation by dehalogenating bacteria on its surface and improves the living environment for dehalogenating bacteria. Next, biochar and its composites provide active sites for the removal of CHCs through adsorption, activation and catalysis. These sites can be specific metal centers, functional groups or structural defects. Under microbial mediation, these sites can undergo activation and catalytic cycles, thereby increasing dechlorination efficiency. However, there is a lack of systematic understanding of the mechanisms of dechlorination in biogenic and abiogenic systems based on biochar. Therefore, this article comprehensively summarizes the recent research progress of biochar and its composites as a “Taiwan balm” for the degradation of CHCs in terms of adsorption, catalysis, improvement of microbial community structure and promotion of degradation and metabolism of CHCs. The removal efficiency, influencing factors and reaction mechanism of the degraded CHCs were also discussed. The following conclusions were drawn, in the pure biochar system, the CHCs are fixed to its surface by adsorption through chemical bonds on its surface; the biochar composite material relies on persistent free radicals and electron shuttle mechanisms to react with CHCs, disrupting their molecular structure and reducing them; biochar-coupled microorganisms reduce CHCs primarily by forming an “electron shuttle bridge” between biological and non-biological organisms. Finally, the experimental directions to be carried out in the future are suggested to explore the optimal solution to improve the treatment efficiency of CHCs in water.

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Section: Synergistic Microbial Treatment Of Biochar and Its Compositesmentioning

confidence: 99%

Biochar, microbes, and biochar-microbe synergistic treatment of chlorinated hydrocarbons in groundwater: a review

Niu,

Li,

Gao

et al. 2024

Front. Microbiol.

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“…Microorganisms in the soil can directly or indirectly participate in soil activities [ 19 , 20 , 21 , 22 ]. It has been demonstrated by several studies that biochar can increase soil microbial diversity [ 23 , 24 , 25 , 26 , 27 ]. However, the mechanism by which biochar affects soil microbial diversity is less clear.…”

Section: Introductionmentioning

confidence: 99%

Meta-Analysis of the Effects of Biochar Application on the Diversity of Soil Bacteria and Fungi

Wang

Weng

et al. 2023

Microorganisms

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Biochar is increasingly being used for soil improvement, but the effects on microbial diversity in soil are still ambiguous due to contrasting results reported in the literature. We conducted a meta-analysis to clarify the effect of biochar addition on soil bacterial and fungal diversity with an increase in Shannon or Chao1 index as the outcome. Different experimental setups, quantitative levels of biochar addition, various biochar source materials and preparation temperatures, and the effect of natural precipitation in field experiments were the investigated variables. From a total of 95 publications identified for analysis, 384 datasets for Shannon index and 277 datasets for Chao1 index were extracted that described the bacterial diversity in the soils, of which field experiments and locations in China dominated. The application of biochar in soil significantly increased the diversity of soil bacteria but it had no significant effect on the diversity of fungi. Of the different experimental setups, the largest increase in bacterial diversity was seen for field experiments, followed by pot experiments, but laboratory and greenhouse settings did not report a significant increase. In field experiments, natural precipitation had a strong effect, and biochar increased bacterial diversity most in humid conditions (mean annual precipitation, MAP > 800 mm), followed by semi-arid conditions (MAP 200–400 mm). Biochar prepared from herbaceous materials was more effective to increase bacterial diversity than other raw materials and the optimal pyrolysis temperature was 350–550 °C. Addition of biochar at various levels produced inconclusive data for Chao1 and Shannon indices, and its effect was less strong than that of the other assessed variables.

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“…Recent studies also found that electroactive quinoid groups and π-π conjugated structures in BC can accelerate the migration of electrons from nZVI to chlorinated hydrocarbons, thus further improving the reducing capacity of nZVI [ 10 ]. However, the relatively low bioavailable carbon content of BC cannot provide sufficient carbon sources to simulate the activity of functional bacteria responsible for reductive dechlorination [ 11 ]. Polycaprolactone (PCL) is a solid organic substance with excellent biodegradability and biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

Polycaprolactone-Modified Biochar Supported Nanoscale Zero-Valent Iron Coupling with Shewanella putrefaciens CN32 for 1,1,1-Trichloroethane Removal from Simulated Groundwater: Synthesis, Optimization, and Mechanism

Mao

Meng

et al. 2023

Molecules

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1,1,1-Trichloroethane (1,1,1-TCA) is a typical organochloride solvent in groundwater that poses threats to human health and the environment due to its carcinogenesis and bioaccumulation. In this study, a novel composite with nanoscale zero-valent iron (nZVI) supported by polycaprolac-tone (PCL)-modified biochar (nZVI@PBC) was synthesized via solution intercalation and liquid-phase reduction to address the 1,1,1-TCA pollution problem in groundwater. The synergy effect and improvement mechanism of 1,1,1-TCA removal from simulated groundwater in the presence of nZVI@PBC coupling with Shewanella putrefaciens CN32 were investigated. The results were as follows: (1) The composite surface was rough and porous, and PCL and nZVI were loaded uniformly onto the biochar surface as micro-particles and nanoparticles, respectively; (2) the optimal mass ratio of PCL, biochar, and nZVI was 1:7:2, and the optimal composite dosage was 1.0% (w/v); (3) under the optimal conditions, nZVI@PBC + CN32 exhibited excellent removal performance for 1,1,1-TCA, with a removal rate of 82.98% within 360 h, while the maximum removal rate was only 41.44% in the nZVI + CN32 treatment; (4) the abundance of CN32 and the concentration of adsorbed Fe(II) in the nZVI@PBC + CN32 treatment were significantly higher than that in control treatments, while the total organic carbon (TOC) concentration first increased and then decreased during the culture process; (5) the major improvement mechanisms include the nZVI-mediated chemical reductive dechlorination and the CN32-mediated microbial dissimilatory iron reduction. In conclusion, the nZVI@PBC composite coupling with CN32 can be a potential technique to apply for 1,1,1-TCA removal in groundwater.

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Biochar and biochar-polylactic acid composite enhance biodegradation of hexachlorobenzene in soil by altering microbial community

Cited by 4 publications

References 55 publications

Biochar, microbes, and biochar-microbe synergistic treatment of chlorinated hydrocarbons in groundwater: a review

Biochar, microbes, and biochar-microbe synergistic treatment of chlorinated hydrocarbons in groundwater: a review

Meta-Analysis of the Effects of Biochar Application on the Diversity of Soil Bacteria and Fungi

Polycaprolactone-Modified Biochar Supported Nanoscale Zero-Valent Iron Coupling with Shewanella putrefaciens CN32 for 1,1,1-Trichloroethane Removal from Simulated Groundwater: Synthesis, Optimization, and Mechanism

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