Mechanism of Selective Precipitation of Molybdenum from Tungstate Solution

Zeng, Luqi; Zhao, Zhongwei; Huo, Guangsheng; Wang, Xinqiang; Pu, Haipeng

doi:10.1007/s11837-019-03915-9

Cited by 10 publications

(8 citation statements)

References 28 publications

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“…The formation of sulfides occurs by a series of complex acid–base and redox reactions. The following equations can represent the tetra-thiomolybdate formation from heptamolybdate , …”

Section: Resultsmentioning

confidence: 99%

“…The formation of sulfides occurs by a series of complex acid−base and redox reactions. The following equations can represent the tetra-thiomolybdate formation from heptamolybdate 38,39 Mo O 4OH 7MoO 4H In NH 4 CuMoS 4 and Cu 2 MoS 4 , copper exists as Cu + . Since the starting material comprises Cu 2+ , there is a definitive redox reaction responsible for the formation of the compounds as mentioned above.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Cu–Mo–S Mixed Chalcogenide Nanostructures for Pseudocapacitive Applications

Karati

Lahkar

et al. 2022

ACS Appl. Nano Mater.

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The present work reports the synthesis of a Cu–Mo–S mixed chalcogenide by wet chemical synthesis. The compound exhibited morphology similar to nanocubes with size in the range of 30–50 nm. The phase formation and pseudocapacitive properties of the compound were investigated. X-ray diffraction analyses demonstrated the presence of CuS and a ternary phase that do not match with any reported structure. The ternary phase exhibited cube-like structures with a size in the range of 60–80 nm. Extensive electron diffraction analysis using high-resolution transmission electron microscopy established that the compound belongs to the tetragonal phase (space group: P4/mmm), exhibiting a structure similar to the Cu4RbS3 phase. The scanning transmission electron microscopyenergy-dispersive X-ray spectroscopy established the chemical composition and confirmed the presence of a ternary Cu–Mo–S (Cu21Mo5S14) phase. The compound exhibited a maximum specific capacitance of 159 F g–1 at a scan rate of 5 mV s–1 in 1 M Na2SO4 electrolyte.

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“…The formation of sulfides occurs by a series of complex acid–base and redox reactions. The following equations can represent the tetra-thiomolybdate formation from heptamolybdate , …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Cu–Mo–S Mixed Chalcogenide Nanostructures for Pseudocapacitive Applications

Karati

Lahkar

et al. 2022

ACS Appl. Nano Mater.

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“…The precipitation of metals from synthetic leachates by addition of Na 2 S resulted in the potential complete recovery of Mo at acidic pH values between 1 and 2 [119]. An adequate process design (optimal pH and temperature selection) can facilitate the selective precipitation of Mo in the presence of other metals, such as, V, Co or Cu [120], but complex sulfides, such as NH 4 CuMoS 4 and Cu 2 MoS 4 , may appear [121].…”

Section: Coagulation-flocculation-precipitationmentioning

confidence: 99%

An Overview to Technical Solutions for Molybdenum Removal: Perspective from the Analysis of the Scientific Literature on Molybdenum and Drinking Water (1990–2019)

Abejón

2022

Water

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A bibliometric analysis using the Scopus database was performed to investigate the research documents published from 1990 to 2019 in scientific sources related to molybdenum in drinking water and determine the quantitative characteristics of the research in this period. The results from the analysis revealed that the number of publications was maintained at a regular production of around 5 papers per year until 2009, followed by a fast linear increase in the production in the period from 2010 to 2016 (29 papers in 2016), but the scientific production regarding this topic was reduced in 2017 and 2018 to recover the production obtained in 2016 once again in 2019. The total contribution of the three most productive countries (USA, China and India, respectively) accounted for around 50% of the total number of publications. Environmental Science was the most common subject (51.4% contribution), followed by Chemistry (26.7% contribution). The research efforts targeted toward the search for technical solutions for molybdenum removal from water are not as important as the ones focused on the identification of molybdenum-polluted water bodies and the analysis of the health effects of the intake of molybdenum. Nevertheless, examples of technological treatments to remove molybdenum from the aqueous solution include the use of adsorption and ion exchange; coagulation, flocculation and precipitation followed by filtration; membrane technologies and biological treatments.

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“…Some scholars have used extraction methods to dislodge heavy metals and compounds, but efficiency has been very low and the effective use times have been lower [ 22 , 23 , 24 , 25 ]. Recently, some scholars have used new liquid sheeting technology to dislodge heavy metals [ 26 ]. However, due to the lack of supplementary solution, the dislodging efficiency has been low, the sheeting has been used fewer times, and the cost has been high [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Diphasic Sheeting Device with Cyanex-301 for Dislodging Feature of Divalent Cadmium from Industrial Effluent

Pei

Wang

2022

IJERPH

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A novel diphasic sheeting device (DSD) including complemental feeding stage and complemental disintegrating stage for dislodging features of Cd(II), was investigated. The complemental feeding stage included feeding liquor and Bis(2,4,4 trimethylamyl) dithiophosphonic acid (Cyanex-301) as the carrier in petroleum, and the complemental disintegrating stage included Cyanex-301 as the carrier in petroleum and hydrochloric acid as the disintegrating reagent. The impacts of volumetric ratio of sheeting liquor and feeding liquor(S/F), initial molarity of Cd(II) and ion intensity of the feeding liquor, pH, volumetric ratio of sheeting liquor and disintegrating reagent (S/D), molarity of hydrochloric acid liquor, Cyanex-301 molarity in the complemental disintegrating stage on dislodging of Cd(II), the virtues of DSD compared to the traditional sheeting device, the constancy of system, the reuse of sheeting liquor, and the retention of the sheeting stage were also investigated. Experimental results illustrated that the optimum dislodging conditions of Cd(II) were achieved as hydrochloric acid molarity was 4.00 mol/L, Cyanex-301 molarity was 0.150 mol/L, and S/D was 1:1 in the complemental disintegrating stage, S/F was 1:10, and pH was 5.00 in the complemental feeding stage. The ion intensity of the complemental feeding stage had no distinct impact on the dislodging feature of Cd(II). When initial Cd(II) molarity was 3.20 × 10−4 mol/L, the Cd(II) dislodging percentage was up to 92.9% in 210 min. The dynamic formula was inferred on the basis of the theorem of mass transferring and the interfacial chemistry.

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Mechanism of Selective Precipitation of Molybdenum from Tungstate Solution

Cited by 10 publications

References 28 publications

Cu–Mo–S Mixed Chalcogenide Nanostructures for Pseudocapacitive Applications

Cu–Mo–S Mixed Chalcogenide Nanostructures for Pseudocapacitive Applications

An Overview to Technical Solutions for Molybdenum Removal: Perspective from the Analysis of the Scientific Literature on Molybdenum and Drinking Water (1990–2019)

Diphasic Sheeting Device with Cyanex-301 for Dislodging Feature of Divalent Cadmium from Industrial Effluent

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