JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Xinyu Guo,Zhibao Liu,Hui Chen,Yuqi Zhu,Yaopeng Zhang,Fang Li,Chunyan Ma,Chensi Shen
The coexistence of antimony (Sb) contamination from textile industries and phosphorus (P) enrichment poses a significant yet understudied threat to aquatic ecosystems. This study elucidates how P availability determines Sb toxicity in cyanobacteria. Under P-deficient conditions (0 and 3.0 mg/L), Sb (50 μg/L) consistently inhibited Synechococcus sp. growth (by 29.5 % and 14.1 %, respectively) over 144 h. While, at optimal and high P levels (5.4 and 9.0 mg/L), Synechococcus sp. cells exhibited initial inhibition followed by growth promotion (by 18.8 % and 38.7 %, respectively). Mechanistically, P-deficient cells accumulated 3.7-fold more Sb, developed severe SOD/CAT imbalance (5.2-fold increase and 44.9 % decrease), and showed substantially higher ROS levels despite rapid initial Sb(III) oxidation. These divergent physiological responses were underpinned by distinct molecular adaptations. Transcriptomic analysis revealed that P-sufficient cells strategically upregulated sulfate transporters while downregulating phosphate transporters (pstS/pstC/pstA) to minimize Sb uptake, exhibited balanced redox regulation, and maintained efficient electron transport chains. In contrast, P-deficient cells upregulated emergency stress responses (flavodoxin FldA) but failed to maintain effective metal transport regulation. This study establishes nutrient status as a key determinant of Sb toxicity, demonstrating that eutrophication transforms Sb from an inhibitor to a promoter, with implications for cyanobacterial bloom management.
研究领域:
环境科学
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分子生物学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Chenyu Wang,Xiaolong Ling,Chaoyue Wu,Chao He,Biao Gui,Weibo Sun
Phosphorus is a very important resource, and dewatered cyanobacteria contains a large amount of it. Basic additives, such as KOH, are often used to promote hydrogen production during supercritical water gasification (SCWG) of biomass, but their effects phosphorus transformation have rarely been investigated. In this study, SCWG of dewatered cyanobacteria with potassium salt and KOH was conducted in autoclave at 400 °C for 10 min, to investigate the effect of K + on the transformation of phosphorus under neutral and alkaline conditions. Results showed that K + increased the proportion of phosphorus in the solid phase from 88.4% to 90.8–98.3%. Furthermore, K + could promote the transformation of iron-combined phosphorus to calcium-combined phosphorus and occluded phosphate. Only when the reaction environment was alkaline, the proportion of phosphorus in the solid phase was significantly reduced to a minimum of 26.1%. When the amount of OH − was sufficient, can this part of phosphorus and organic phosphorus , which was decomposed and transformed by the promotion of OH − , be transferred to the liquid products. Results from this study laid a foundation simultaneously for hydrogen production and phosphorus recovery more environmentally and high-effectively.
研究领域:
环境科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2019
·Vol. 10
·期 1
·1-12
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IF 11.878
Zhu Huawei,Meng Hengkai,Zhang Wei,Gao Haichun,Zhou Jie,Zhang Yanping,Li Yin
Microbial biophotovoltaics (BPV) offers a biological solution for renewable energy production by using photosynthetic microorganisms as light absorbers. Although abiotic engineering approaches, e.g., electrode modification and device optimization, can enhance the electrochemical communication between living cells and electrodes, the power densities of BPV are still low due to the weak exoelectrogenic activity of photosynthetic microorganisms. Here, we develop a BPV based on a d -lactate mediated microbial consortium consisting of photosynthetic cyanobacteria and exoelectrogenic Shewanella . By directing solar energy from photons to d -lactate, then to electricity, this BPV generates a power density of over 150 mW·m −2 in a temporal separation setup. Furthermore, a spatial-temporal separation setup with medium replenishment enables stable operation for over 40 days with an average power density of 135 mW·m −2 . These results demonstrate the electron flow constrained microbial consortium can facilitate electron export from photosynthetic cells and achieve an efficient and durable power output.
研究领域:
生物能工程
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微生物学
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
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IF 11.4
Chengyang Zhang,Guoyang Zhang,Jiyuan Jin,Hongcen Zheng,Zhiwei Zhou,Shujuan Zhang
The coexistence of selenite (Se(IV)) and acetylacetone (AA) generated a synergistic effect on the growth inhibition of a bloom-forming cyanobacterium, Microcystis aeruginosa. The mechanism behind this phenomenon is of great significance in the control of harmful algal blooms. To elucidate the role of Se(IV) in this effect, the reactions in ternary solutions composed of Se(IV), AA (or two other similar hydrogen donors), and quinones, especially benzoquinone (BQ), were investigated. The transformation kinetic results demonstrate that Se(IV) played a catalytic role in the reactions between AA (or ascorbic acid) and quinones. By comparison with five other oxyanions (sulfite, sulfate, nitrite, nitrate, and phosphate) and two AA derivatives, the formation of an AA-Se(IV) complexation intermediate was confirmed as a key step in the accelerated reactions between BQ and AA. To our knowledge, this is the first report on Se(IV) as a catalyst for quinone-involved reactions. Since both quinones and Se are essential in cells and there are many other chemicals of similar electron-donating properties to that of AA, the finding here shed light on the regulation of electron transport chains in a variety of processes, especially the redox balances that are tuned by quinones and glutathione.
研究领域:
环境科学
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微生物学
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生态学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2014
·
IF 4.331
Zaisheng Yan,Helong Jiang,Xiaohong Li,Yuan Shi
The removal of pyrene and benzo[ a ]pyrene (B a P) were investigated in freshwater sediments with amendment of seven different organic matters including cyanobacteria-derived organic matter (COM), plant-derived organic matter (POM), and humic substances (HS). During the 210 days of experiments, the amendment of COM or HS enhanced significantly the removal of pyrene and B a P in sediments, especially with fresh COM (FCOM) treatment much superior to HS. On the contrary, degradation of these polycyclic aromatic hydrocarbons (PAHs) was not significantly improved and even inhibited in POM-amended sediments. The first-order rate constants of pyrene and B a P degradation in the FCOM-amended sediments reached 0.00540 ± 0.00017 d −1 and 0.00517 ± 0.00057 d −1 , respectively, and were about three and five folds of those in the control treatment. The enhanced PAHs degradation in FCOM-amended sediments was related to higher PAH-degrading bacteria number and bioavailability with a result of biostimulation and priming effect by labile carbon and high-value nutrition in FCOM. Thus, this study improved our understanding about effects of settled biomass from cyanobacterial blooms, which occurred frequently in eutrophic aquatic ecosystems, on the natural attenuation of PAHs in sediments. Furthermore, this study would also help develop a new promising approach to remediate PAH-contaminated sediments through utilization of cyanobacterial bloom biomass.
研究领域:
环境科学
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微生物学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Yongze Li,Yazhou Tang,Yuchen Yang,Wenxiang Zhou,Chujie Qi,Kai Zhou,Bo Bian
Existing cyanobacteria thickening and dewatering processes in Taihu Lake commonly use conventional inorganic flocculants to condition the cyanobacteria, which poses certain environmental risks. In this study, three different types of typical flocculants, namely polymerized aluminum chloride (PAC), cationic polyacrylamide (CPAM) and starch-based flocculant (St-CTA), were selected to investigate their flocculant effects on cyanobacteria and the mechanism of action. The analysis showed that the dosage of St-CTA was low, the flocculation efficiency was high, and it could form flocs with large particle size and high strength. The adsorption and precipitation effect of St-CTA on protein and polysaccharide in flocculated EPS was stronger than that of CPAM and PAC, and it was able to act on the protein structure of EPS favorable for flocculation, improve the hydrophilic effect of S-EPS and LB-EPS, and reduce the content of bound water in EPS from 2.08 to 1.22 g/g DS, thus improving the efficiency of algae-water separation. The free energy and energy barrier of the EPS surface in each layer of the cyanobacterial floc after flocculation by St-CTA were significantly reduced, which resulted in the tendency of the cyanobacterial particles to aggregate and thus flocculate and settle. The pilot validation of St-CTA for cyanobacteria dewatering showed that the water content of algal residue could be reduced to 93.48 %, and the removal efficiencies of total nitrogen (TN), total phosphorus (TP), ammoniacal nitrogen (NH 3 -N), and chemical oxygen demand (COD) in the air-floated water could be up to 27.3 %, 76.6 %, 27.4 %, and 56.4 %, respectively. In conclusion, this study provides scientific knowledge and demonstration for promoting the use of St-CTA to condition cyanobacterial thickening and dewatering, which is a new idea to solve the problem of cyanobacterial resourcefulness and safe utilization.
研究领域:
环境科学
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生物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2020
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IF 3.465
Lixin Li,Jie Wang,Chao Jia,Ying Lv,Yan Liu
Cyanobacteria and plastics, as the two major problems of the water environment crisis, need to be solved urgently. In particular, there is no reasonable method for simultaneously treating these wastes and recovering useful resources from them. Therefore, the mixture of cyanobacteria and polypropylene (PP) plastics is directly pyrolyzed at different activation conditions to synthesize the composite carbon (CPC) materials, which have excellent performance in water contaminant removal. The result indicates that the added PP is beneficial to improve the properties of CPC material, increasing its specific surface area and pore volume (up to 2811 m 2 /g and 1.992 cm 3 /g, respectively). The application performance of CPC materials is mainly determined by the surface area and pore volume. Therefore, the CPC materials exhibit a higher methylene blue (MB) adsorption (maximum 490 mg/g). This paper provides a new strategy for recycling wastes from water environment and new ideas for synthesizing high-performance composite materials.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENT INTERNATIONAL
·
2019
·
IF 7.943
Feilong Dong,Jiaqi Liu,Cong Li,Qiufeng Lin,Tuqiao Zhang,Kejia Zhang,Virender K. Sharma
Algal organic matter (AOM) from seasonal algal blooms may be an important precursor of disinfection byproducts (DBPs) in drinking water. This paper presents the effect of ferrate(VI) treatment on two blue-green algae, Chlorella sp. and Pseudanabaena limnetica , in eutrophic water. The results demonstrated that Fe(VI) removed the algal cells by causing cell death, apoptosis, and lost integrity, and decreased AOM (in terms of total organic carbon) in water via oxidation and coagulation. Chlorination of the Fe(VI) pre-oxidized algal water samples generated halogenated DBPs (including trihalomethanes, haloacetic acids, haloketones, chloral hydrate, haloacetonitriles, and trichloronitromethane), but the concentrations of DBPs were lower than those formed in the chlorinated samples without pre-treatment by Fe(VI). Higher Fe(VI) dose, longer oxidation time, and alkaline pH were beneficial in controlling DBPs. In bromide-containing algal solutions, negligible amount of bromo-DBPs were generated in the Fe(VI) pre-oxidation, and halogenated DBPs were mainly formed in the subsequent chlorination.
研究领域:
环境科学
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水处理工程
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Gongduan Fan,Zhong Chen,Shiping Gu,Banghao Du,Lihui Wang
Cyanobacterial harmful algal blooms (CyanoHABs) and the release of cyanotoxins have posed adverse impacts to aquatic system and human health. In this study, a novel self-floating Ag/ [email protected] 3 (ALFO) photocatalytic hydrogel was prepared via freeze-thaw method for removal of Microcystis aeruginosa ( M. aeruginosa ). The ALFO hydrogel performed an excellent photocatalytic activity with a 99.4% removal efficiency of chlorophyll a within 4 h. It can still remove above 95% chlorophyll a after six consecutive recycles. Besides it has also shown excellent mechanical strength and elasticity, which can ensure its use in practical applications. The mechanisms of M. aeruginosa inactivation are attributed to •O 2 − and •OH generated by the ALFO hydrogel under visible light radiation . In addition, •O 2 − and •OH can further oxidative degrade and even mineralize the leaked algae organic matter, avoiding the recurrence of CyanoHABs. What's more, the ALFO hydrogel owns good photocatalytic degradation performance for microcystins-LR (MC-LR) with a 97% removal efficiency within 90 min. A possible photocatalytic degradation pathway of MC-LR was proposed through the identification of the intermediate products during the photocatalytic reaction, which confirmed the reduction of MC-LR toxicity. This work develops recyclable a self-floating ALFO hydrogel to simultaneously inactivate M. aeruginosa and degrade MC-LR, providing a prospective method for governing and controlling CyanoHABs in practical application.
研究领域:
环境科学
·
水处理
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光催化
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毒理学
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水生生态学
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产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Lixin Li,Ying Lv,Jie Wang,Chao Jia,Zhaoshun Zhan,Zilong Dong,Lilai Liu,Xiangdong Zhu
Porous carbon obtained by co-pyrolysis of plastic and biomass has received a lot of attention due to its excellent adsorption properties, and the pore structure plays an essential role in adsorption performance, however, the pore structure is still not well understood. Herein, we synthesized cyanobacteria-based porous carbon derived from cyanobacteria and polypropylene plastic by one-step method. CPC-800–30% exhibited a high BET surface area (2140 m 2 /g), pore volume up to 1.44 cm 3 /g. PP not only improved the pore structure of porous carbon, but also enriched the types of functional groups, such as O–H, N–H, C=O, and –CH, due to dehydroxylation or amino group decreased, resulting in the hydrogen radicals increased, hence PP had positive effect for biomass during co-pyrolysis. Meanwhile, CPC-800–30% showed excellent methylene blue (MB) adsorption capacity (667 mg/g). This work provided a new strategy for enhancing porous carbon structure via using PP as additive.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Boyin Yan,Zhiquan Liu,Rui Huang,Yongpeng Xu,Dongmei Liu,Wei Wang,Zhiwei Zhao,Fuyi Cui,Wenxin Shi
Cyanobacteria produce a series of secondary metabolites , one of which is beta- N -methylamino- l -alanine (BMAA). BMAA is considered to be the cause of human neurodegeneration. Compared with other cyanotoxins, the role of BMAA in cyanobacteria remains unclear. To investigate this question, six strains of cyanobacteria were cultured and tested in this experiment with an optimized and validated BMAA determination method. The results show that four strains can produce BMAA. The effects of nutrient levels on the production of BMAA by Anabaena sp. FACHB-418 were studied by changing the initial concentrations of nitrate (NaNO 3 ) and phosphate (K 2 HPO 4 ) in mediums. Bound BMAA was detected in all samples and the concentrations were within 50–100 ng/g. Free BMAA was presence when the concentration of nitrogen was lower than 1.7 mg/L (121.43 μM). Free BMAA was released from the dead and ruptured cells during the cell decline period, so dissolved BMAA cannot be detectable in the adaptation and logarithmic periods, but could be abundant in the decline periods. Statistical analyses show that free BMAA concentrations were negatively correlated with nitrogen strongly (p = 2.334 × 10 −10 and r = −0.842), but positively correlated with phosphorus weakly (p = 0.016 and r = 0.405). Moreover, the results of culture experiments indicated that exogenous BMAA could inhibit the growth of cyanobacteria that cannot produce BMAA, and the effect was enhanced as the concentration of exogenous BMAA increased. This phenomenon implies that the production of BMAA may be the stress response by some cyanobacteria to low nitrogen conditions to kill other cyanobacteria, i.e., their competitors.
研究领域:
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
METABOLIC ENGINEERING
·
2013
·
IF 6.859
Wei Du,Feiyan Liang,Yangkai Duan,Xiaoming Tan,Xuefeng Lu
Because cyanobacteria are photosynthetic, fast-growing microorganisms that can accumulate sucrose under salt stress, they have a potential application as a sugar source for the biomass-derived production of renewable fuels and chemicals. In the present study, the production of sucrose by the cyanobacteria Synechocystis sp. PCC6803, Synechococcus elongatus PCC7942, and Anabaena sp. PCC7120 was examined. The three species displayed different growth curves and intracellular sucrose accumulation rates in response to NaCl. Synechocystis sp. PCC6803 was used to examine the impact of modifying the metabolic pathway on the levels of sucrose production. The co-overexpression of sps ( slr0045 ) , spp ( slr0953 ), and ugp ( slr0207 ) lead to a 2-fold increase in intracellular sucrose accumulation, whereas knockout of ggpS ( sll1566 ) resulted in a 1.5-fold increase in the production of this sugar. When combined, these genetic modifications resulted in a fourfold increase in intracellular sucrose accumulation. To explore methods for optimizing the transport of the intracellular sucrose to the growth medium, the acid-wash technique and the CscB (sucrose permease)-dependent export method were evaluated using Synechocystis sp. PCC6803. Whereas the acid-wash technique proved to be effective, the CscB-dependent export method was not effective. Taken together, these results suggest that using genetic engineering, photosynthetic cyanobacteria can be optimized for efficient sucrose production.
研究领域:
微生物学
·
遗传学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）