Fate of heavy metals during molten salts thermal treatment of municipal solid waste incineration fly ashes

Xie, Kang; Hu, Hongyun; Xu, Sihua; Chen, Tongzhou; Huang, Yongda; Yang, Yuhan; Yang, Fan; Yao, Hong

doi:10.1016/j.wasman.2019.12.047

Cited by 39 publications

(16 citation statements)

References 41 publications

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“…In general, numerous synthetic methodologies have been developed for the preparation of 2D Bi 2 MoO 6 materials, including hydrothermal/solvothermal synthesis, refluxing method, and reactive magnetron sputtering, etc. In 2003, Andrew M. Beale and Gopinathan Sankar successfully prepared the highly crystalline γ‐phase Bi 2 MoO 6 via a hydrothermal method, which was time‐saving and reproducible.…”

Section: Modulated Strategies Of Bi2moo6‐based Materials With Multifumentioning

confidence: 99%

Modulation of Bi₂MoO₆‐Based Materials for Photocatalytic Water Splitting and Environmental Application: a Critical Review

Jiang

Wang

et al. 2019

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Highly active photocatalysts driving chemical reactions are of paramount importance toward renewable energy substitutes and environmental protection. As a fascinating Aurivillius phase material, Bi 2 MoO 6 has been the hotspot in photocatalytic applications due to its visible light absorption, nontoxicity, low cost, and high chemical durability. However, pure Bi 2 MoO 6 suffers from low efficiency in separating photogenerated carriers, small surface area, and poor quantum yield, resulting in low photocatalytic activity. Various strategies, such as morphology control, doping/defect-introduction, metal deposition, semiconductor combination, and surface modification with conjugative π structures, have been systematically explored to improve the photocatalytic activity of Bi 2 MoO 6 . To accelerate further developments of Bi 2 MoO 6 in the field of photocatalysis, this comprehensive Review endeavors to summarize recent research progress for the construction of highly efficient Bi 2 MoO 6 -based photocatalysts. Furthermore, benefiting from the enhanced photo catalytic activity of Bi 2 MoO 6 -based materials, various photocatalytic applications including water splitting, pollutant removal, and disinfection of bacteria, were introduced and critically reviewed. Finally, the current challenges and prospects of Bi 2 MoO 6 are pointed out. This comprehensive Review is expected to consolidate the existing fundamental theories of photo catalysis and pave a novel avenue to rationally design highly efficient Bi 2 MoO 6 -based photocatalysts for environmental pollution control and green energy development.

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Section: Modulated Strategies Of Bi2moo6‐based Materials With Multifumentioning

confidence: 99%

Modulation of Bi₂MoO₆‐Based Materials for Photocatalytic Water Splitting and Environmental Application: a Critical Review

Jiang

Wang

et al. 2019

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186

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“…About 4.1 million tons of MSW are incinerated each year in China, leading to a large quantity of municipal solid waste incineration (MSWI) fly ash [2]. MSWI fly ash contains high levels of heavy metals (HMs) such as Zn, Pb, Cu, Cd, Cr, and Ni [3][4][5]. Their content and leaching concentration are regulated by a set of standards [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Their content and leaching concentration are regulated by a set of standards [6,7]. At present, separation/extraction [7], solidification/stabilization [4], and heat treatment [5,6] are used to reduce the harm of solid waste caused by HMs. However, heavy metal ions are release secondarily after treatment [4,7].…”

Section: Introductionmentioning

confidence: 99%

“…At present, separation/extraction [7], solidification/stabilization [4], and heat treatment [5,6] are used to reduce the harm of solid waste caused by HMs. However, heavy metal ions are release secondarily after treatment [4,7]. The released heavy metals may transfer to ecosystems such as groundwater or crops through water and food webs, thus affecting human health [8].…”

Section: Introductionmentioning

confidence: 99%

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Seasonal Variation of the Mobility and Toxicity of Metals in Beijing’s Municipal Solid Waste Incineration Fly Ash

et al. 2021

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Metal mobility and toxicity of the municipal solid waste incineration (MSWI) fly ash from different seasons in Beijing were studied using leaching toxicity procedures, sequential extraction procedures, and bioavailability procedures. The X-ray diffraction results showed that MSWI fly ash contained CaSO4, CaCO3, and KCl. The Pb, Zn, and Cd contents of MSWI fly ash were high, especially during autumn, being 42, 77, and 1260 times higher than that of their soil backgrounds, respectively. Leaching toxicity experiments showed that MSWI fly ash is hazardous, since Pb exceeded the maximum threshold (5 mg/L). The main alkali metal ions and anions, heavy metals total content, leaching concentration, chemical speciation, and bioavailability varied seasonally. The Pb and Zn leaching concentrations in summer and autumn were higher than that of the other two seasons. Sequential extraction procedures indicated that Pb, Zn, and Cd showed extremely high metal mobility, i.e., the residual states of Pb and Cd in spring were 5.83% and 1.21%, respectively, and that of Zn in autumn was 10.68%. These results will help industries, governments, and the public better understand the risk of MSWI fly ash and will urge them to pay more attention to preventing harm to the ecosystem and human beings.

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“…Piezoelectric ceramics primarily based on lead oxide (PbO) are commonly used as piezoelectric actuators, sensors, and transducers for their exceptional piezoelectric prop-erties [1]. Nonetheless, evaporation related to the hazardous nature of PbO during hightemperature sintering not only leads to ecological pollution, but also triggers variability of the composition and electrical characteristics of material [2,3]. Consequently, researchers around the world are focused on the synthesis of green lead-free piezoelectric ceramics to eliminate the hazardous lead oxide-based ceramics [4].…”

Section: Introductionmentioning

confidence: 99%

Weight Loss during Calcination and Sintering Process of Na0.5Bi0.5TiO3–Bi1/2(Mg2/3Nb1/3)O3 Composite Lead-Free Piezoelectric Ceramics

et al. 2021

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(1 − x)(Na0.5Bi0.5)TiO3–xBi(Mg2/3Nb1/3)O3 ceramics with x = 0.00 mol.% (0BMN), 0.01 mol.% (1BMN), 0.03 mol.% (3BMN), and 0.05 mol.% (5BMN) were synthesized using a solid-state processing technique. The thermogravimetric analysis (TGA) of uncalcined samples up to 730 °C showed that the maximum weight loss was observed for 3BMN, whereas the minimum weight loss was attributed to the 0BMN sample. After that, calcination was performed at 800 °C for 4 h. The XRD of calcined samples showed the successful formation of the perovskite phase with no impurity phases. 1BMN and 3BMN samples showed some of the lattice strain; however, a morphotropic phase boundary (MPB) existed around x = 0.03 between the rhombohedral and tetragonal structure. The TGA of the green pellets showed weight loss up to the sintering temperature (1100 °C) and during the 3 h holding period. 5BMN showed the maximum weight loss up to sintering temperature, as well as during the holding period, whereas 0BMN displayed the minimum weight loss up to sintering temperature, as well as some weight gain during the holding period. The relative permittivity (εr) was maximum at low frequencies, but the addition of BMN improved the εr. The frequency dependence of dielectric loss (tanδ) showed that the maximum loss was observed for 3BMN at lower frequencies, and 5BMN showed the maximum loss at higher frequency among all samples.

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Fate of heavy metals during molten salts thermal treatment of municipal solid waste incineration fly ashes

Cited by 39 publications

References 41 publications

Modulation of Bi₂MoO₆‐Based Materials for Photocatalytic Water Splitting and Environmental Application: a Critical Review

Modulation of Bi₂MoO₆‐Based Materials for Photocatalytic Water Splitting and Environmental Application: a Critical Review

Seasonal Variation of the Mobility and Toxicity of Metals in Beijing’s Municipal Solid Waste Incineration Fly Ash

Weight Loss during Calcination and Sintering Process of Na0.5Bi0.5TiO3–Bi1/2(Mg2/3Nb1/3)O3 Composite Lead-Free Piezoelectric Ceramics

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Fate of heavy metals during molten salts thermal treatment of municipal solid waste incineration fly ashes

Cited by 39 publications

References 41 publications

Modulation of Bi2MoO6‐Based Materials for Photocatalytic Water Splitting and Environmental Application: a Critical Review

Modulation of Bi2MoO6‐Based Materials for Photocatalytic Water Splitting and Environmental Application: a Critical Review

Seasonal Variation of the Mobility and Toxicity of Metals in Beijing’s Municipal Solid Waste Incineration Fly Ash

Weight Loss during Calcination and Sintering Process of Na0.5Bi0.5TiO3–Bi1/2(Mg2/3Nb1/3)O3 Composite Lead-Free Piezoelectric Ceramics

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Modulation of Bi₂MoO₆‐Based Materials for Photocatalytic Water Splitting and Environmental Application: a Critical Review

Modulation of Bi₂MoO₆‐Based Materials for Photocatalytic Water Splitting and Environmental Application: a Critical Review