Insight into biosorption of heavy metals by extracellular polymer substances and the improvement of the efficacy: a review

Li, C.; Yu, Yongsheng; Fang, Anran; Feng, Dongdong; Du, Meng; Tang, Aiping; Chen, S.; Li, A.

doi:10.1111/lam.13563

Cited by 26 publications

(12 citation statements)

References 101 publications

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“…ExoR/ExoS/ChvI form a major regulatory circuit that regulates exo gene expression, with ExoS activating ChvI through phosphorylation, which in turn activates exo gene expression [ 159 , 160 ]. ExoR inhibits the synthesis of ExoS thereby suppressing the production of EPS [ 161 , 162 ]. In addition, when plants are nitrogen deficient, the nitrogen metabolism regulatory protein NtrC is induced and the expression of NodD3 is activated by SyrM and vice versa, enhancing the synthesis of Nod factors.…”

Section: Detoxification Regulation Strategies Of Rhizobium Symbiosis ...mentioning

confidence: 99%

Signaling and Detoxification Strategies in Plant-Microbes Symbiosis under Heavy Metal Stress: A Mechanistic Understanding

Liu

et al. 2022

Microorganisms

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Plants typically interact with a variety of microorganisms, including bacteria, mycorrhizal fungi, and other organisms, in their above- and below-ground parts. In the biosphere, the interactions of plants with diverse microbes enable them to acquire a wide range of symbiotic advantages, resulting in enhanced plant growth and development and stress tolerance to toxic metals (TMs). Recent studies have shown that certain microorganisms can reduce the accumulation of TMs in plants through various mechanisms and can reduce the bioavailability of TMs in soil. However, relevant progress is lacking in summarization. This review mechanistically summarizes the common mediating pathways, detoxification strategies, and homeostatic mechanisms based on the research progress of the joint prevention and control of TMs by arbuscular mycorrhizal fungi (AMF)-plant and Rhizobium-plant interactions. Given the importance of tripartite mutualism in the plant-microbe system, it is necessary to further explore key signaling molecules to understand the role of plant-microbe mutualism in improving plant tolerance under heavy metal stress in the contaminated soil environments. It is hoped that our findings will be useful in studying plant stress tolerance under a broad range of environmental conditions and will help in developing new technologies for ensuring crop health and performance in future.

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Section: Detoxification Regulation Strategies Of Rhizobium Symbiosis ...mentioning

confidence: 99%

Signaling and Detoxification Strategies in Plant-Microbes Symbiosis under Heavy Metal Stress: A Mechanistic Understanding

Liu

et al. 2022

Microorganisms

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“…Hg 2+ removal from wastewater is mainly carried out through precipitation/coprecipitation, as it is a robust method towards water hardness and the presence of other contaminants; however, it is expensive and often coupled with adsorption as a polishing technology. Membrane filtration is expensive, sensitive to other contaminants, and produces a large volume of residues, while other methods such as ion exchange, reverse osmosis, complexation/sequestration, and electrochemical operations are commercially impractical, inefficient, expensive, and yield toxic intermediate products [ 1 , 8 ]. Currently, adsorption is considered a cost-effective technology for the treatment of heavy metals in wastewater that has several advantages over conventional methods due to high efficiency, low cost, ease of operation, the possibility of metal recovery, and adsorbent regeneration as well as no secondary pollution.…”

Section: Introductionmentioning

confidence: 99%

Sargassum@magnetite Composite EDTA-Functionalized for the Potential Removal of Mercury

et al. 2023

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Sargassum spp. affects the Caribbean shores; thus, its remotion or valorization is a priority. This work aimed to synthesize a low-cost magnetically retrievable Hg+2 adsorbent functionalized with ethylenediaminetetraacetic acid (EDTA) based on Sargassum. The Sargassum was solubilized to synthesize by co-precipitation a magnetic composite. A central composite design was assessed to maximize the adsorption of Hg+2. The solids yield magnetically attracted mass, and the saturation magnetizations of the functionalized composite were 60.1 ± 17.2%, 75.9 ± 6.6%, and 1.4 emu g−1. The functionalized magnetic composite yielded 29.8 ± 0.75 mg Hg+2 g−1 of chemisorption after 12 h, pH 5, and 25 °C achieving 75% Hg+2 adsorption after four reuse cycles. Crosslinking and functionalization with Fe3O4 and EDTA created differences in surface roughness as well as the thermal events of the composites. The Fe3O4@Sargassum@EDTA composite was a magnetically recovered biosorbent of Hg2+.

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“…Bacterial ExPs find their successful applications in heavy metal removal, oil recovery, and various in situ remediation techniques such as emulsifiers, sorbents, biofilters, surfactants, and bioflocculants [ 16 , 17 , 18 ]. The interest of environmental researchers in ExP-producing bacteria is also highlighted in several patent deposits focusing on the prosperous application of bacteria in the remediation of contaminated sites.…”

Section: Introductionmentioning

confidence: 99%

Role of Exopolysaccharides of Pseudomonas in Heavy Metal Removal and Other Remediation Strategies

et al. 2022

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Pseudomonas biofilms have been studied intensively for several decades and research outcomes have been successfully implemented in various medical and agricultural applications. Research on biofilm synthesis and composition has also overlapped with the objectives of environmental sciences, since biofilm components show exceptional physicochemical properties applicable to remediation techniques. Especially, exopolysaccharides (ExPs) have been at the center of scientific interest, indicating their potential in solving the environmental issues of heavy metal land and water contamination via sorptive interactions and flocculation. Since exposure to heavy metal via contaminated water or soil poses an imminent risk to the environment and human health, ExPs provide an interesting and viable solution to this issue, alongside other effective and green remedial techniques (e.g., phytostabilization, implementation of biosolids, and biosorption using agricultural wastes) aiming to restore contaminated sites to their natural, pollution-free state, or to ameliorate the negative impact of heavy metals on the environment. Thus, we discuss the plausible role and performance of Pseudomonas ExPs in remediation techniques, aiming to provide the relevant available and comprehensive information on ExPs’ biosynthesis and their usage in heavy metal remediation or other environmental applications, such as wastewater treatment via bioflocculation and soil remediation.

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Insight into biosorption of heavy metals by extracellular polymer substances and the improvement of the efficacy: a review

Cited by 26 publications

References 101 publications

Signaling and Detoxification Strategies in Plant-Microbes Symbiosis under Heavy Metal Stress: A Mechanistic Understanding

Signaling and Detoxification Strategies in Plant-Microbes Symbiosis under Heavy Metal Stress: A Mechanistic Understanding

Sargassum@magnetite Composite EDTA-Functionalized for the Potential Removal of Mercury

Role of Exopolysaccharides of Pseudomonas in Heavy Metal Removal and Other Remediation Strategies

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