The denitrification characteristics of novel functional biocarriers immobilised by non-dissolved redox mediators

Xu, Qing; Guo, Jianbo; Niu, Chunmei; Lian, Jing; Hou, Zhenghao; Guo, Yihang; Li, Shaoying

doi:10.1016/j.bej.2014.12.004

Cited by 17 publications

(4 citation statements)

References 42 publications

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“…Therefore, HAs in sediments enhanced the recycling of nitrogen used to form ammonium, which also represents in situ remediation ability in aquatic ecosystems through microbial redox reactions ( Guo et al, 2018 ). Humic RMs were also reported for the enhancement of denitrification ( Xu et al, 2015 ; Xiao et al, 2016 ), further study should also be carried out to investigate the effects of HSs as an RM on other microbial metabolic routes in the nitrogen cycle (i.e., nitrogen fixation and ammoniation, which will be helpful for further understanding on the influence of HSs to the total nitrogen cycle in aquatic ecosystems through microbial metabolisms).…”

Section: Discussionmentioning

confidence: 99%

Redox Structures of Humic Acids Derived From Different Sediments and Their Effects on Microbial Reduction Reactions

Zhang

et al. 2018

Front. Microbiol.

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Herein, we investigated the chemical, electrochemical, and spectroscopic characteristics of humic acids (HAs) extracted from sediments of different origin [Ling Qiao river, Xi Xi wetland, Qi Zhen lake (QZ), and Hu Zhou pond in Zhejiang province, China], paying particular attention to their role in the enhancement of nitrate and FeOOH reduction. Notably, the highest C/N ratio (16.16), O/C ratio (1.89), and Fe content (11.57 g kg-1 sample) were observed for HAs extracted from QZ sediment. Cyclic voltammetry analyses confirmed that all HAs contained redox-active groups and exhibited redox potentials between -0.36 and -0.28 V vs. the standard hydrogen electrode. All HAs showed similar Fourier transform infrared spectra with variable absorption intensity, the spectra verified the presence of aromatic C=C, C–H, and C=O of quinone ketones group in HAs. Electron spin resonance suggested that quinone moieties within HAs are the redox-active centers. All HAs promoted the microbial reduction of nitrate and amorphous FeOOH by Shewanella oneidensis strain MR-1, achieving high nitrate reduction extents of 79–98.4%, compared to the biotic and abiotic control values of 29.6 and 0.006%, respectively. The corresponding extents of Fe(II) production equaled 43.25–60.5%, exceeding those of biotic and abiotic controls (28.5 and 0.005%, respectively). In addition to the highest C/N, O/C ratio, and Fe content, HA extracted from QZ sediment also exhibited the highest nitrate and FeOOH reduction performances. Although the proportion of organic redox-active carbon is small, the potential electron-mediating ability is not ignorable. HAs are redox active for enhancing microbial reduction of nitrate and amorphous FeOOH regardless of the location or texture of parent sediments, implying their great potential for acting as redox mediator in enhancing multiple microbial reduction, thereby affecting various biogeochemical processes (i.e., iron cycle, nitrogen cycle, etc.) as well as in situ remediation in anaerobic environment.

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Section: Discussionmentioning

confidence: 99%

Redox Structures of Humic Acids Derived From Different Sediments and Their Effects on Microbial Reduction Reactions

Zhang

et al. 2018

Front. Microbiol.

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“…In this case, the first-order reduction rate constants of azo dyes increased by 9.0-fold compared with the control treatment. Further, a two-step procedure consisting of amination and the Buchwald-Hartwig reaction was also developed to immobilize quinone-based RMs, efficiently mediating the reductive removal of azo dyes, nitrate, and NACs (Zhang et al 2014b;Xu et al 2015). In (bio)electrochemical systems, electrodeposition, adsorption, and crossinglinking have been successfully applied to prepare RM-modified electrodes for use in MFC and microbial electrolysis cell (MEC) systems; which in turn benefit the electron-transferal during redox reactions, enhancing the bioelectricity generation, pollutant removal, and energy storage (Table 3).…”

Section: Solid Carbon Materials and Their Modificationmentioning

confidence: 99%

Environmental applications of immobilized and bio-resourced redox mediators: A Review

Guo

Huang

2022

BioRes

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Redox mediators (RMs), also known as electron shuttles, have been widely reported to promote both biotic and abiotic reductions of oxidized pollutants in water, soil, biogeochemical cycles, and wastewater treatment systems. However, the continuous addition of dissolved RMs is unaffordable and the potential environmental risks remain unknown because most applied RMs are synthetic chemicals. Immobilization technology enables RMs to be attached on non-dissolved supports, avoiding wash-out from the treatment systems. This realizes the reuse of RMs in scaled-up engineering applications and the in-situ remediation. Moreover, renewable natural biomass and their derivatives, such as biochar, have also aroused increased interest because they provide an economical and feasible way to solve the shortcomings of applying soluble RMs. This review presents different RM immobilization methods, which include entrapment, adsorption, and surface modification, as well as the use of bio-resourced RMs. The immobilization procedures and reaction mechanisms of the immobilized RMs and bio-resourced RMs in environmental applications are critically compared and summarized.

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“…In addition, Xu et al [36] studied that polyethylene terephthalate modified by 1,8-dichloroanthraquinone (PET-1,8-DCA) was the functional biocarrier for accelerating denitrification with 0.14 mmol anthraquinone and the denitrification efficiency was enhanced by 1.49-fold. Liu et al [20] studied that the denitrification efficiency increased by nearly 1.5-fold with active carbon felt/electropolymerization of polypyrrole (PPy)/AQS (0.012 mmol) by electropolymerization, when compared to the control.…”

Section: Application Of Pa6-aqs For Denitrificationmentioning

confidence: 99%

Preparation characteristics and accelerating denitrification effectiveness of polyamide 6 modified by AQS

Guo

Niu

et al. 2015

Biotechnology & Biotechnological Equipment

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In this study, the functional polymer biocarrier polyamide 6 (PA6) modified by anthraquinone-2-sulphonate (AQS) was synthesized by hydrolysis and sulphonation reactions. The optimal hydrolysis conditions of PA6 were 35 C, 3 mol/L HCl and 72 h reaction time. The optimal sulphonation conditions of PA6 modified by AQS (PA6-AQS) were 30 C and 6 h reaction time. The morphology and heat resistance of PA6-AQS were analysed by scanning electron microscopy, thermogravimetric analysis and differential scanning calorimetry. The AQS content of PA6-AQS, determined by an elemental analysis, was approximately 0.11 mmol/g. The denitrification efficiency was enhanced by 1.78-fold with PA6-AQS. Repeated-batch operations showed that the denitrification efficiency with PA6-AQS became stabilized above 80% of the original value and exhibited a better catalytic activity and durability.

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The denitrification characteristics of novel functional biocarriers immobilised by non-dissolved redox mediators

Cited by 17 publications

References 42 publications

Redox Structures of Humic Acids Derived From Different Sediments and Their Effects on Microbial Reduction Reactions

Redox Structures of Humic Acids Derived From Different Sediments and Their Effects on Microbial Reduction Reactions

Environmental applications of immobilized and bio-resourced redox mediators: A Review

Preparation characteristics and accelerating denitrification effectiveness of polyamide 6 modified by AQS

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