Transformation behavior of the morphology, structure and toxicity of amorphous As2S3 during hydrothermal process

Min, Xin; Xu, Qiujing; Ke, Yanxiong; Yao, Liwei; Wang, Jingwen; Ren, Hongzheng; Li, Tongbing; Lin, Zhang

doi:10.1016/j.hydromet.2020.105549

Cited by 16 publications

(4 citation statements)

References 33 publications

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“…However, various synthesis methods for Bi 2 S 3 nanocrystals reported E g values ranging from 1.3 to 1.7 eV [6,7]. In comparison to other highly toxic mineral sulfides such as Greenockite (CdS), Orpiment (As 2 S 3 ), or Cinnabar (HgS), Bismutinite (Bi 2 S 3 ) can be considered a compound with low or no toxicity [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Synthesis of Bi2S3 Hierarchical Microstructures via Co-Precipitation and Digestive Process in Aqueous Medium

Carrasco-González,

Ortega-Amaya,

Díaz-Torres

et al. 2024

Materials

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Bismuth sulfide (Bi2S3) nanostructures have gained significant attention in the fields of catalysis, optoelectronics, and biomedicine due to their unique physicochemical properties. This paper introduces a simple and cost-effective method for producing Bi2S3 microstructures at low temperatures (25 and 70 °C). These microstructures are formed by the hierarchical self-assembly of Bi2S3 nanoparticles, which are typically 15–40 nm in size. The nanoparticles are synthesized by the co-precipitation of thioglycolic acid, thioacetamide, and bismuth nitrate in water. The study delves into the phase composition and morphological evolution of the microstructures, concerning the chemical composition of the solution and the synthesis temperature. X-ray analysis has confirmed the formation of single-phase bismuthinite Bi2S3. The synthesis process generates primary building blocks in the form of 15–40 nm Bi2S3 nanocrystals, which then go through a hierarchical self-assembly process to produce a range of micrometer-sized structures. A scanning electron microscopy examination revealed that the primary nanoparticles self-assemble into quasi-1D worm-like nanostructures, which then self-assemble to create sponge-shaped microstructures. These structures subsequently self-organize and refine into either flower- or dandelion-like microstructures, mostly depending on the synthesis temperature and the chemistry of the digestion medium.

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Section: Introductionmentioning

confidence: 99%

Low-Temperature Synthesis of Bi2S3 Hierarchical Microstructures via Co-Precipitation and Digestive Process in Aqueous Medium

Carrasco-González,

Ortega-Amaya,

Díaz-Torres

et al. 2024

Materials

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“…For example, the hydrothermal method , has emerged as a promising approach to convert ASS into dense arsenic-containing minerals, to achieve the effective immobilization of arsenic . Xu et al , used a hydrothermal treatment to transform the muddy ASS into bulk orpiment (As 2 S 3 ) crystals with a metallic sheen, reduced volume, and lower water content. Nevertheless, the presence of As(III) in orpiment raises concerns regarding long-term stability and safety .…”

Section: Introductionmentioning

confidence: 99%

Stabilization of Arsenic Sulfide Sludge to Form Stable Johnbaumite by Alkaline-Oxidative Hydrothermal Treatment

Hu,

Li,

et al. 2024

ACS EST Eng.

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The arsenic sulfide sludge (ASS) generated from the treatment of acidic arsenic-containing wastewater by sulfide precipitation causes severe environmental pollution due to its potential to release highly toxic As(III). This work describes an alkaline-oxidative hydrothermal method that converted ASS to the highly stable johnbaumite mineral (Ca5(AsO4)3(OH)) in which arsenic exists as the less toxic As(V). Under the optimal reaction conditions, i.e., with H2O2 (ω = 3.3 wt %) and Ca(OH)2 (m CH/m ASS = 1:1) at pH = 14.18 and 180 °C for 18 h, the arsenic leaching was reduced from 762.85 mg/L for the original ASS down to 0.04 mg/L for the hydrothermally treated product, far below the 1.2 mg/L limit set in the Chinese standard GB 18598-2019. The stabilization of arsenic mainly involved three steps: (i) As(III) in ASS was released into the alkaline solution and oxidized to AsO4 3–, (ii) the free AsO4 3– was captured by Ca2+ to form the Ca3(AsO4)2 and Ca5(AsO4)3(OH), (iii) the intermediate Ca3(AsO4)2 was further converted to johnbaumite under hydrothermal condition, and eventually AsO4 3– was stably encapsulated in the johnbaumite lattice. This study thus provided an effective strategy for the treatment and safe disposal of ASS and revealed the mechanisms underlying arsenic stabilization via johnbaumite.

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Section: Introductionmentioning

confidence: 99%

“…More than 32 million tons of As-contaminated sludge are estimated to be produced from nonferrous metals every year. Given its complex composition, As-contaminated sludge is difficult to treat, − causing various environmental problems. , Solidification/stabilization is an important method to treat waste containing heavy metals. , Previous research and engineering practice have shown that this technology usually uses ordinary Portland cement (OPC) as a binder to solidify waste containing heavy metals. However, OPC production uses a large amount of energy and generates a large volume of greenhouse gases. , In addition, OPC production requires large amounts of nonrenewable raw materials.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Stabilization/Solidification of Arsenic-Contaminated Sludge by a Blast Furnace Slag-Based Cementitious Material: Functions of CaO and NaCl

Quan

Yang

et al. 2022

ACS Omega

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Arsenic is a kind of element widely distributed in the environment that may pose a threat to the ecological environment and human health, while effective remediation and sustainable utilization of arsenic-containing sludge is a challenge. Based on stabilization/solidification blast furnace slag-based cementitious materials (BCMs), this study innovatively proposes to improve the arsenic (As) solidification efficiency and long-term stability by using the activation mode of CaO and NaCl. The effects of different factors on the properties of the BCM were measured by unconfined compressive strength (UCS) tests, X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. The long-term stability and safety of the BCM were verified by leaching toxicity and improved three stage continuous extraction method (BCR) tests. Experimental results show that the addition of CaO provides conditions for the formation of ettringite (AFt), thus promoting the crystal growth of AFt. The addition of NaCl can promote the formation of Cl-AFt and play a good long-term stabilizing role. When the content of the alkali activator is 10% and the modulus is 1.0, the contents of CaO and NaCl are 10 and 1%, respectively. The BCM has the best efficiency in terms of UCS and As solidification. The UCS at 28 days was 5.4 MPa, and the leaching concentration of As was 0.309 mg/L, and the As solidification efficiency was up to 99.9%. In the improved BCR test, the proportions of residual and oxidizable states of arsenic increased by 19.6 and 13.5%, respectively, and the stability of heavy metals improved. These findings show that the BCM has good long-term stability and safety. Overall, this study shows that CaO and NaCl significantly increase the output of AFt and achieve the purpose of efficient and stable solidification of As by the BCM.

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Transformation behavior of the morphology, structure and toxicity of amorphous As2S3 during hydrothermal process

Cited by 16 publications

References 33 publications

Low-Temperature Synthesis of Bi2S3 Hierarchical Microstructures via Co-Precipitation and Digestive Process in Aqueous Medium

Low-Temperature Synthesis of Bi2S3 Hierarchical Microstructures via Co-Precipitation and Digestive Process in Aqueous Medium

Stabilization of Arsenic Sulfide Sludge to Form Stable Johnbaumite by Alkaline-Oxidative Hydrothermal Treatment

Long-Term Stabilization/Solidification of Arsenic-Contaminated Sludge by a Blast Furnace Slag-Based Cementitious Material: Functions of CaO and NaCl

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