A novel thermosensitive persulfate controlled-release hydrogel based on agarose/silica composite for sustained nitrobenzene degradation from groundwater

Wu, Shuxuan; Deng, Sheng; Fu, Xianliang; Han, Xu; Ju, Tianyu; Xiao, Han; Xu, Xiangjian; Yang, Yu; Jiang, Yonghai; Xi, Beidou

doi:10.1016/j.jhazmat.2022.130619

Cited by 7 publications

(2 citation statements)

References 31 publications

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“…As illustrated in Figure D, compared to AuAg@SiO 2 and agarose hydrogel patch, recorded on M-hydrogel patch, the characteristic FTIR peaks at 790 and 558 cm –1 are attributed to symmetric Si–O–Si stretching and Si–O–Si bending, respectively. The broadening of the FTIR peak at 1030 cm –1 in the M-hydrogel patch also confirmed the interaction between AuAg@SiO 2 and the agarose hydrogel patch. − XRD patterns of Figure F for AuAg@SiO 2 and M-hydrogel present the main 2θ peaks of metallic Au and Ag at 38.2°, 44.3°, 64.5°, 77.5°, and 81.7° correspond to the (111), (200), (220), (311) and (222) lattice planes. The XRD peak at 21.9° from the SiO 2 lattice also indicates the AuAg@SiO 2 embedded in the M-hydrogel. , …”

Section: Resultssupporting

confidence: 55%

Reactive Hydrogel Patch for SERS Detection of Environmental Formaldehyde

Cao

Tang

et al. 2023

ACS Sens.

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The tobacco epidemic is a public health threat that has taken a heavy toll of lives around the globe each year. As one of the poison species from smoking, formaldehyde (FA) affects both the smokers and nearby persons who are exposed to second-hand smoke. Therefore, on-site tracking of FA exposure could evaluate the public environmental safety and mitigate the potential hazards. Herein, we first prepare SiO2-shelled AuAg alloy nanoparticles (AuAg@SiO2) and then embed AuAg@SiO2 within agarose hydrogel to construct the three-dimensional (3D) surface-enhanced Raman scattering (SERS) substrate. A reagent of 3-methyl-2-benzothiazolinone hydrazine (MBTH) with reaction activity toward FA is loaded in the 3D substrate to obtain the selective SERS patch (designated as M-hydrogel patch). Based on a marker Raman peak at 1273 cm–1 from the reaction product of MBTH-FA, the M-hydrogel patch is used to realize SERS detection of FA in smoke. A good linear relationship from 5 × 10–4 to 5 mg/m3 and a limit of detection (LOD) of 2.92 × 10–5 mg/m3 could be reached. While for detection of FA in aqueous, a linear range of 1 × 10–7–1 × 10–3 mg/mL with an LOD of 1.46 × 10–8 mg/mL could be achieved. As the real application, the proposed M-hydrogel patch could be placed anywhere indoor to SERS evaluate the spatial distribution of FA in tobacco smoke, which is in connection with the second-hand smoke effect on children and adults. Such M-hydrogel patch-based SERS assay is exerted for on-field detection of FA in water and furniture panels by using a portable Raman system, showing satisfactory selectivity and reproducibility.

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Section: Resultssupporting

confidence: 55%

Reactive Hydrogel Patch for SERS Detection of Environmental Formaldehyde

Cao

Tang

et al. 2023

ACS Sens.

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“…The first signal amplification was achieved by constructing a hydrogel with a selective preconcentration of the target. Since silica hydrogel can be easily functionalized and has excellent biological adaptability while alginate-polyacrylamide gel has strong compressive properties, we proposed a new core–shell biocontainment method with functionalized silica gel as the core and alginate-polyacrylamide gel as the shell. − The functional silica gel was used to construct a core for selective adsorption of specific pollutants, which not only significantly reduced the detection limit and improved the detection sensitivity but also effectively shortened the detection time. Subsequently, the second signal amplification was achieved by constructing an engineered Escherichia coli with positive feedback signal amplification to the target substance using gene concatenation technology.…”

Section: Introductionmentioning

confidence: 99%

A Stable and Sensitive Engineering Bacterial Sensor via Physical Biocontainment and Two-Stage Signal Amplification

Che,

Wang,

et al. 2024

Anal. Chem.

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Although engineering bacterial sensors have outstanding advantages in reflecting the actual bioavailability and continuous monitoring of pollutants, the potential escape risk of engineering microorganisms and lower detection sensitivity have always been one of the biggest challenges limiting their wider application. In this study, a core–shell hydrogel bead with functionalized silica as the core and alginate-polyacrylamide as the shell have been developed not only to realize zero escape of engineered bacteria but also to maintain cell activity in harsh environments, such as extremely acidic/alkaline pH, high salt concentration, and strong pressure. Particularly, after combining the selective preconcentration toward pollutants by functionalized core and the positive feedback signal amplification of engineering bacteria, biosensors have realized two-stage signal amplification, significantly improving the detection sensitivity and reducing the detection limit. In addition, this strategy was actually applied to the detection of As(III) and As(V) coexisting in environmental samples, and the detection sensitivity was increased by 3.23 and 4.39 times compared to sensors without signal amplification strategy, respectively, and the detection limits were as low as 0.39 and 0.86 ppb, respectively.

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