Pb Removal Using Mixed Substrates in a Constructed Laboratory-Scale Unvegetated Vertical Subsurface-Flow Wetland

Ren, Jing; Gao, Su-Xia; Tao, Ling; Li, Hua

doi:10.15244/pjoes/60397

Cited by 8 publications

(8 citation statements)

References 19 publications

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“…With the development of industrialization and urbanization, the needs for metals have increased drastically, and therefore have created a widespread contamination of heavy metals to water bodies and soils, especially in developing countries [ 3 ]. Lead is one of the most dangerous heavy metals, and is used as an industrial raw material for storage battery manufacturing, printing, pigments, fuels, photography materials and explosives manufacturing [ 4 ]. The use of lead compounds also causes large amounts of industrial wastewater containing the high quantity of Pb(II) ions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Reduced Graphene Oxide-Supported Nanoscale Zero-Valent Iron (nZVI/rGO) Composites Used for Pb(II) Removal

Fan

et al. 2016

Materials

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Reduced graphene oxide-supported nanoscale zero-valent iron (nZVI/rGO) composites were prepared by chemical deposition method and were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, N2-sorption and X-ray photoelectron spectroscopy (XPS). Operating parameters for the removal process of Pb(II) ions, such as temperature (20–40 °C), pH (3–5), initial concentration (400–600 mg/L) and contact time (20–60 min), were optimized using a quadratic model. The coefficient of determination (R2 > 0.99) obtained for the mathematical model indicates a high correlation between the experimental and predicted values. The optimal temperature, pH, initial concentration and contact time for Pb(II) ions removal in the present experiment were 21.30 °C, 5.00, 400.00 mg/L and 60.00 min, respectively. In addition, the Pb(II) removal by nZVI/rGO composites was quantitatively evaluated by using adsorption isotherms, such as Langmuir and Freundlich isotherm models, of which Langmuir isotherm gave a better correlation, and the calculated maximum adsorption capacity was 910 mg/g. The removal process of Pb(II) ions could be completed within 50 min, which was well described by the pseudo-second order kinetic model. Therefore, the nZVI/rGO composites are suitable as efficient materials for the advanced treatment of Pb(II)-containing wastewater.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Reduced Graphene Oxide-Supported Nanoscale Zero-Valent Iron (nZVI/rGO) Composites Used for Pb(II) Removal

Fan

et al. 2016

Materials

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“…In recent years the most important and significant nano product in the nanotechnology field is silver NPs, which are widely and significantly used in textiles and garments, food covering, medicinal and cosmetic raw material, fresh water, wastewater and to treat air, pesticides and also in domestic usage [17][18][19][20][21][22][23][24]. Ni NPs have shown excellent antibacterial properties against Escherichia coli, Lactobacillus casei, staphylococcus aureus, Pseudomonas aeruginosa and Bacillus subtilis [25][26]. At present, nanocomposites offer new business opportunities for all areas of technology and industry in spite of being conservational and green in nature [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Antibacterial Activity of POMA Nanocomposites

Hussain¹,

Ahmad²,

Jalal³

et al. 2019

Pol. J. Environ. Stud.

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In this study, antibacterial activity of the prepared nanocomposites [poly (o-methoxy-aniline); POMA] at different concentrations was tested on bacterial strains. Nanocomposites were prepared by in situ chemical polymerization of ortho anisidine monomer in acidic medium with ammonium peroxydisulphate (APS) as an oxidant. The composition, structure and morphology of the polymer and nanocomposites were characterized by Fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD) and ultraviolet-visible (UV-vis) spectroscopy. Different concentrations of nickel nanoparticles (1%, 2%, 3%, 4%, 5%) were used to confirm the characteristics of the synthesized nanocomposites. Antibacterial activity was tested against two strains: E. coli and S. typhi. A significant increase in the antibacterial activity of nanocomposites has been observed with an increase in concentration of nickel nanoparticles (Ni NPs). Excellent antibacterial activity was observed with nanocomposite having 5% Ni NPs.

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“…Industrial development has caused serious environmental pollution with heavy metals, especially in developing countries [1]. Therefore, affordable and effective treatment technologies are highly desirable [2,3].…”

Section: Introductionmentioning

confidence: 99%

Decomposition of Plant Litter under Chromium Pollution and Associated Characteristics of Chromium Release

2019

Pol. J. Environ. Stud.

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In vegetated constructed wetlands, plants used for phytoremediation may release pollutants back into the aquatic system as a result of decomposition after senescence, lessening wastewater disposal efficiency. After treatment of wastewater containing chromium with Alternanthera philoxeroides in constructed wetland, plant litter was used to study the release characteristics of chromium with the biomass decomposition under different levels of Cr pollution. Results indicate that decomposition rates of plant litter under zero and low-level Cr pollution were larger than those under high pollution concentration. Under low Cr intensity, the total Cr concentration in the residual increased in the first 40 days, and then decreased to 67.72% of the initial concentration. In the end, the residual ratios of plant litter in different pollution intensities were 57.91%, 48.16% and 71.79% of the initial mass on average separately, and about 57.45%, 67.14% and 38.32% of Cr had been released into the aquatic environment. The changes in percentages of chemical forms in residual should be correlated with the decomposition process reflected by the interactive effects. The release of Cr could be divided into two stages, i.e. immobilization and discharge. These results were possible coming from the moderating effect of different Cr intensities on microbial decomposers.

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Pb Removal Using Mixed Substrates in a Constructed Laboratory-Scale Unvegetated Vertical Subsurface-Flow Wetland

Cited by 8 publications

References 19 publications

Synthesis and Characterization of Reduced Graphene Oxide-Supported Nanoscale Zero-Valent Iron (nZVI/rGO) Composites Used for Pb(II) Removal

Synthesis and Characterization of Reduced Graphene Oxide-Supported Nanoscale Zero-Valent Iron (nZVI/rGO) Composites Used for Pb(II) Removal

Investigating the Antibacterial Activity of POMA Nanocomposites

Decomposition of Plant Litter under Chromium Pollution and Associated Characteristics of Chromium Release

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