Incorporation of trace metals Cu, Zn, and Cd into gypsum: Implication on their mobility and fate in natural and anthropogenic environments

Ma, Xu; Goméz, Mario A.; Yuan, Zidan; Bi, Ran; Zhang, Jiaxi; Wang, Shaofeng; Yao, Shanshan; Kersten, Michael; Jia, Yongfeng

doi:10.1016/j.chemgeo.2020.119574

Cited by 16 publications

(7 citation statements)

References 43 publications

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“…This reaction mechanism indicated that the pH will reach a constant value after As(III) was completely oxidized to As(V) by H 2 O 2 (the As(III)/H 2 O 2 molar ratio was approximately 1). Thus, the pH of the As-enriched solution could also be used as an indicator of the endpoint of the As(III) oxidation process. Furthermore, the oxidation–reduction potential (ORP) could be used as an indicator of the residual concentration of As(III) by measuring the highest and the lowest ORPs after H 2 O 2 is added . As can be seen, the Eh value increased rapidly after the addition of H 2 O 2 and then decreased after the consumption of H 2 O 2 by As(III).…”

Section: Resultsmentioning

confidence: 96%

“…Furthermore, the oxidation−reduction potential (ORP) could be used as an indicator of the residual concentration of As(III) by measuring the highest and the lowest ORPs after H 2 O 2 is added. 41 As can be seen, the Eh value increased rapidly after The unit of concentration is g/L. the addition of H 2 O 2 and then decreased after the consumption of H 2 O 2 by As(III).…”

Section: Oxidation Of As(iii) To As(v)mentioning

confidence: 83%

“…This result suggested that trace metal cations (i.e., Cu 2+ , Zn 2+ , Cd 2+ ) could be incorporated into the gypsum during the precipitation of Ca 2+ with SO 4 2− in the presence of trace metal cations. 41 In a previous study, Fujita et al 36 proposed a method of preparation of an As(V) solution from As-and Cu-bearing byproducts for scorodite synthesis. In their work, the aqueous As(V) was extracted by the precipitation of Ca 5 (AsO 4 ) 3 (OH) via the addition of hydrated lime (Ca(OH) 2 ) under alkaline conditions.…”

Section: Resultsmentioning

confidence: 99%

“…Notably, the trace metal content found included Cu 0.2 g/kg, Zn 0.1 g/kg, Pb 0.6 g/kg, and Cd 18 mg/kg in gypsum- ACRreal as well as Pb 0.2 g/kg and Cd 89 mg/kg in gypsum- ACRlab after washing five times with an acidic gypsum-saturated solution (Table ). This result suggested that trace metal cations (i.e., Cu 2+ , Zn 2+ , Cd 2+ ) could be incorporated into the gypsum during the precipitation of Ca 2+ with SO 4 2– in the presence of trace metal cations …”

Section: Resultsmentioning

confidence: 99%

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Alternative Method for the Treatment of Hydrometallurgical Arsenic–Calcium Residues: The Immobilization of Arsenic as Scorodite

Yuan

Zhang

et al. 2020

ACS Omega

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Arsenic−calcium residue (ACR) is one of the major hazardous solid wastes produced by the metallurgical industry that poses a serious threat to the environment. However, a suitable method for the effective treatment of ACR is still lacking. In this study, an alternative treatment method for ACRs via the immobilization of As as scorodite was proposed with the use of two types of ACRs (ACR real directly collected from a Pb refinery and ACR lab precipitated from waste sulfuric acid in the lab). The treatment of ACR included preparing the As-enriched solution via H 2 SO 4 dissolution−neutralization of ACR at pH < 2, As(III) was oxidized by H 2 O 2 , and As(V) was immobilized as scorodite. The results showed that gypsum produced from ACR lab in the dissolution− neutralization process contained 68 mg/kg of As, far below the Chinese national standard for hazardous solid wastes (<0.1 wt %, GB5085.62007). The gypsum produced from ACR real contained 5400 mg/kg of As due to the presence of original high-As gypsum (1.6 wt %) in ACR real . These results showed that the preliminary removal of SO 4 2− from waste sulfuric acid by lime neutralization− precipitation at pH ∼ 2 could produce pure-phase gypsum by avoiding the HAsO 4 2− isomorphic substitution for SO 4 2− . The scorodite produced from both ACRs displayed good As stability at pH 4.95 (0.9 and 0.5 mg/L) via the toxicity characteristic leaching procedure (TCLP) method and at pH 3−7 (0.4−3.0 mg/L) via a 15 day short-term stability test.

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Section: Resultsmentioning

confidence: 96%

Section: Oxidation Of As(iii) To As(v)mentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Alternative Method for the Treatment of Hydrometallurgical Arsenic–Calcium Residues: The Immobilization of Arsenic as Scorodite

Yuan

Zhang

et al. 2020

ACS Omega

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“…Full factorial design plan and results. molecules between gypsum crystals, which is more obvious under the lubrication of water molecules(Ma et al 2020, Cai et al 2021, Jia et al 2021.…”

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confidence: 99%

Effect of different soluble salt ions on deformation of desulfurization gypsum in high humidity environment: a statistically designed experimental analysis method

ZHOU

Liu²,

Dai

et al. 2023

Mater. Res. Express

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In response to the green energy-saving goal of carbon neutralization and carbon peak, the research and development of green building materials have become a key research direction. Desulfurization gypsum is widely used in building materials because of its good energy saving, but it cannot be used in high humidity areas because of its highly soluble salt. Based on this reason, this paper uses statistically designed experiments (SDE) to design the experiments on the influence of four common soluble salt ions 〖Na〗^+ 、〖Mg〗^(2+) 、〖Cl〗^- and K^+ on the sagging deformation of desulfurization gypsum, and studies the significance of their influence by SDE experimental analysis method. The results show that: (1) in the environment of a single salt solution, K^+ ion, 〖Mg〗^(2+) ion, 〖Na〗^+ ion, and 〖Cl〗^- ion will cause sagging deformation of desulfurization gypsum, and their values are 0.432mm, 1.933mm, 0.942mm, and 0.940mm respectively. It can be seen that the effect of the 〖Mg〗^(2+) ion is the most significant. (2) In the environment of composite salt solution, K^+ ions will inhibit the sagging deformation of desulfurization gypsum. Specifically, in the compound salt solution environment of K^++〖Mg〗^(2+) and K^++〖Na〗^+, the deformation values are 0.605mm and 0.596mm respectively.

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Role of the salt glands of Armeria maritima (halophyte) in removal of lead from tissues

Wierzbicka,

Begiedza,

Bodzon

et al. 2024

Environ Sci Pollut Res

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Armeria maritima is a halophyte exhibiting a strong tolerance to heavy metals. It grows on zinc–lead waste heaps. This study aimed to determine the role of salt glands in the removal of lead (Pb) from plants and to trace the path of lead from the shoots to the salt glands on the surface of leaves. Mechanisms allowing high tolerance to lead in A. maritima were also evaluated. These examinations were conducted on a lead-tolerant population and a lead-sensitive plant population. The plants were treated with Pb(NO3)2 and the path of lead was traced from the roots to the leaves. The lead-tolerant population transported twice as much lead as the sensitive population. The action of the salt glands resulted in 40% of the leaf lead content in the lead-tolerant population being expelled onto the surface of the leaves. These features indicate the high phytoremediation capabilities of these halophyte plants. The excretion of multi-ionic solutes by the salt glands results in the appearance of tiny crystals on the surface of the leaves. In this publication, for the first time, an attempt was made to determine what chemical compounds build up these crystals and to determine their crystal structure. Solving this problem was possible through the usage of single-crystal X-ray structural analysis.

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Incorporation of trace metals Cu, Zn, and Cd into gypsum: Implication on their mobility and fate in natural and anthropogenic environments

Cited by 16 publications

References 43 publications

Alternative Method for the Treatment of Hydrometallurgical Arsenic–Calcium Residues: The Immobilization of Arsenic as Scorodite

Alternative Method for the Treatment of Hydrometallurgical Arsenic–Calcium Residues: The Immobilization of Arsenic as Scorodite

Effect of different soluble salt ions on deformation of desulfurization gypsum in high humidity environment: a statistically designed experimental analysis method

Role of the salt glands of Armeria maritima (halophyte) in removal of lead from tissues

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