Effective removal of microcystins using carbon nanotubes embedded with bacteria

Yan, Hai; Pan, Gang; Zou, Hua; Li, Xianliang; Chen, Hao

doi:10.1007/bf03184300

Cited by 49 publications

(15 citation statements)

References 15 publications

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“…4). Yan et al (2004b) observed that the biodegradation of MCs by an isolated bacterial strain of Ralstonia solanacearum could be promoted by CNTs, because R. solanacearum and CNTs could be coalescent each other in water solution and the effective biodegradation of MCs could be conducted on the surface of CNTs.…”

Section: Adsorption Of Mcs By Cnts With Different Sizesmentioning

confidence: 99%

Adsorption of microcystins by carbon nanotubes

et al. 2006

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The production of cyanobacterial toxins microcystins (MCs) by cyanobacterial bloom which may promote the growth of tumor in human liver is a growing environmental problem worldwide. In this paper, the adsorption of MC-RR and LR, which were extracted from cyanobacterial cells in Dianchi Lake in China, by carbon nanotubes (CNTs), wood-based activated carbon (ACs) and clays were investigated. Compared with ACs and clay materials of sepiolite, kaolinite and talc tested, CNTs were found to have a strong ability in the adsorption of MCs. At the concentrations of 21.5 mg l À1 MC-RR and 9.6 mg l À1 MC-LR in 50 mmol phosphate buffer solution (pH 7.0), the adsorption amounts of MCs by CNTs with the range of outside diameter from 2 to 10 nm were 14.8 and 5.9 mg g À1 , which were about four times higher than those by other adsorbents tested. It was shown that with the decrease of CNTs outside diameters from 60 to 2 nm, the adsorption amount of MCs was apparently increased, however the size of CNTs particles formed in solution declined. This result implies that the size of CNTs tube pore that is fit for the molecular dimension of MCs plays a dominant role. Furthermore the specific surface area of CNTs was also found to be a factor in the adsorption of MCs. The results suggested that the selection of suitable size of CNTs as a kind of adsorbent is very important in the efficient eliminating MCs from drinking water in future.

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Section: Adsorption Of Mcs By Cnts With Different Sizesmentioning

confidence: 99%

Adsorption of microcystins by carbon nanotubes

et al. 2006

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“…HCB not only destroy the natural ecological system of lakes and rivers but also produce many types of cyanobacteria toxins of which microcystins (MCs) are the most dangerous [5]. In previous studies, we found that HCB in Lake Dianchi in Yunnan Province of China could produce a large amount of MCs [6], and MCs were also detected in Lake Guishui in Beijing, China. MCs are usually retained in algal cells during the growth, but these intracellular toxins are eventually released into water bodies, which can cause severe health risks to animals and humans.…”

Section: Introductionmentioning

confidence: 99%

Microcystin-LR biodegradation by Sphingopyxis sp. USTB-05

Xiao

Yan

Wang

et al. 2010

Front. Environ. Sci. Eng. China

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A promising bacterial strain for biodegrading microcystin-LR (MC-LR) as the sole carbon and nitrogen source was successfully isolated from Lake Dianchi, China. The strain was identified as Sphingopyxis sp. USTB-05, which was the first isolated MCs-biodegrading Sphingopyxis sp. in China. The average biodegradation rate of MC-LR by Sphingopyxis sp. USTB-05 was 28.8 mg$L -1 per day, which was apparently higher than those of other bacteria reported so far. The optimal temperature and pH for both strain USTB-05 growth and MC-LR biodegradation were 30°C and 7.0, respectively. The release of MC-LR from the cyanobacterial cells collected from Lake Guishui and the biodegradation of MC-LR by both strain and cell-free extract (CE) were investigated. The results indicated that MC-LR with the initial concentration of 4.0 mg$L -1 in water was biodegraded by Sphingopyxis sp. USTB-05 within 4 d, while MC-LR with the initial concentration of 28.8 mg$L -1 could be completely removed in 3 h by CE of Sphingopyxis sp. USTB-05 containing 350 mg$L -1 protein. During enzymatic biodegradation of MC-LR, two intermediate metabolites and a dead-end product were observed on an HPLC chromatogram. Moreover, the similar scanning profiles of MC-LR and its metabolic products indicate that the Adda side-chain of MC-LR was kept intact in all products.

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“…Given adequate reversibility of organic compound adsorption and limited desorption hysteresis, sorption of bacterial cells to the surface of CNM aggregates may shorten the diffusion distance, facilitating the utilisation of the sorbed organic compound by the bacteria. This is well illustrated by Yan et al (2004), who studied the removal efficiency of microcystin (MC) toxins from solution by Ralstonia solanacearum bacteria (Gram-negative cells which are able to readily coalesce on fibrous material) immobilised as a biofilm on a nontoxic form of CNTs. Their results showed that the removal efficiencies of MCs were 20 % greater by CNT biological composites than either CNTs or bacteria alone (Yan et al, 2004).…”

Section: Microbial Sorption and Biofilm Formationmentioning

confidence: 95%

“…This is well illustrated by Yan et al (2004), who studied the removal efficiency of microcystin (MC) toxins from solution by Ralstonia solanacearum bacteria (Gram-negative cells which are able to readily coalesce on fibrous material) immobilised as a biofilm on a nontoxic form of CNTs. Their results showed that the removal efficiencies of MCs were 20 % greater by CNT biological composites than either CNTs or bacteria alone (Yan et al, 2004). The findings were explained through absorption of large amounts of MCs and R. solanacearum by CNTs, resulting in a concerted biodegradation reaction (Yan et al, 2004).…”

Section: Microbial Sorption and Biofilm Formationmentioning

confidence: 95%

Carbon nanomaterials in clean and contaminated soils: environmental implications and applications

Riding

Martin

Jones

et al. 2015

SOIL

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Abstract. The exceptional sorptive ability of carbon nanomaterials (CNMs) for hydrophobic organic contaminants (HOCs) is driven by their characteristically large reactive surface areas and highly hydrophobic nature. Given these properties, it is possible for CNMs to impact on the persistence, mobility and bioavailability of contaminants within soils, either favourably through sorption and sequestration, hence reducing their bioavailability, or unfavourably through increasing contaminant dispersal. This review considers the complex and dynamic nature of both soil and CNM physicochemical properties to determine their fate and behaviour, together with their interaction with contaminants and the soil microflora. It is argued that assessment of CNMs within soil should be conducted on a case-by-case basis and further work to assess the long-term stability and toxicity of sorbed contaminants, as well as the toxicity of CNMs themselves, is required before their sorptive abilities can be applied to remedy environmental issues.

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Effective removal of microcystins using carbon nanotubes embedded with bacteria

Cited by 49 publications

References 15 publications

Adsorption of microcystins by carbon nanotubes

Adsorption of microcystins by carbon nanotubes

Microcystin-LR biodegradation by Sphingopyxis sp. USTB-05

Carbon nanomaterials in clean and contaminated soils: environmental implications and applications

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