Coagulation Behavior of Antimony Oxyanions in Water: Influence of pH, Inorganic and Organic Matter on the Physicochemical Characteristics of Iron Precipitates

Inam, Muhammad Ali; Lee, Kang Hoon; Soni, Hira Lal; Mangi, Kashif Hussain; Channa, Abdul Sami; Khan, Rizwan Hasan; Wie, Young Min; Lee, Ki Gang

doi:10.3390/molecules27051663

Cited by 4 publications

(7 citation statements)

References 42 publications

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“…It is speculated that the oxidation and reducibility of Fe affect the adsorption and precipitation of Sb, which is consistent with the experimental results of [43] that after curing for more than 5 days, the stability effect of ferrite, FeSO 4 on Sb all decreased slightly. The results of [44] have showed that the presence of inorganic and organic matter changed the physicochemical properties of the iron salt precipitation, in turn affected the adsorption and precipitation of Sb during the stabilization process.…”

Section: Influence Of Feso 4 On As and Sb Leaching Concentrationsmentioning

confidence: 99%

<i>In-situ</i> Stability and Remediation of Typical Antimony (Sb) Tailings by Combined Solid Waste in Southwest China

Han¹,

Han²,

Luo³

et al. 2023

Pol. J. Environ. Stud.

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To explore the feasibility of reusing solid waste to stabilize high-content arsenic (As) and antimony (Sb) tailings, red mud, fly ash, dried sludge, ferrous sulfate (FeSO 4 ), and rice husk ash (RHA) were used as the stabilizer to stabilize the Sb tailings in Qing Long and Du Shan. The combined treatment with 5% red mud, 10% fly ash, 5% dried sludge, 1% FeSO 4 , and 1% rice husk ash had the best stabilization effects on As and Sb, the leaching concentrations of As and Sb decreased considerably under neutral conditions, this indicates that the leaching behavior of As and Sb is controlled by the alkaline and acid-retarding capacity of the materials. In addition, the leaching of heavy metals decreases with the formation of (C-S-H) and calcite (CaCO 3 ), indicating that heavy metals exist in the form of metal hydration or hydroxide and precipitate on the surface of calcium silicate hydrate (C-S-H) and calcite particles. Leaching of heavy metals in stabilized materials can be considered as a pH-dependent and control process of stabilization products.

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Section: Influence Of Feso 4 On As and Sb Leaching Concentrationsmentioning

confidence: 99%

<i>In-situ</i> Stability and Remediation of Typical Antimony (Sb) Tailings by Combined Solid Waste in Southwest China

Han¹,

Han²,

Luo³

et al. 2023

Pol. J. Environ. Stud.

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“…The 1000 mg/L (417 mgC/L) stock solution of humic acid (HA) was prepared by adding HA powder in pure water. The sodium hydroxide (NaOH) solution was used to adjust pH of HA stock solution to 11 and was stirred at 100 rpm for 24 h [29]. This model organic matter is widely used to simulate natural water conditions [18,24].…”

Section: Preparation Of Stock Solutions and Test Samplesmentioning

confidence: 99%

“…The predetermined quantity of FC dosage was first supplied to test samples in all trials during a rapid coagulation phase followed by a pH adjustment to 7, which is close to real groundwater conditions. The experimental procedure was then executed using a jar tester apparatus (Model: SJ-10, Young Hana Tech Co., Ltd., Gyeongsangbuk-Do, Korea) in various phases: Flash mixing phase (coagulation at 140 rpm for 3 min); slow mixing phase (flocculation at 40 rpm for 20 min); and sedimentation phase (settling of particles for 30 min) [24,25,29,31]. The aliquots were collected after experimental procedure and analyzed for quantifying TOC content using an unfiltered sample using a TOC analyzer (TOC-5000A, Shimadzu Corp, Kyoto, Japan).…”

Section: Experimental Procedures and Analytical Techniquesmentioning

confidence: 99%

“…However, these HA molecules may form complexes with iron (Fe) and Sb species during the FC coagulation process, thereby affecting the efficiency of the water treatment system and posing adverse human health effects [16,27]. To date, the influence of HA on the adsorption, complexation, speciation, and coagulation behavior of Sb have been reported in previous studies [23,28,29]. However, the literature provides insufficient knowledge about the interacting performance of Sb and HA during the water treatment process, necessitating additional research as a significant aspect focusing on the operating parameters in commonly applied drinking water treatment technologies.…”

Section: Introductionmentioning

confidence: 99%

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Competitive Removal of Antimony and Humic Acid by Ferric Chloride: Optimization of Coagulation Process Using Response Surface Methodology

Inam

Khan

Lee

et al. 2023

Water

Self Cite

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The co-contamination of aquatic systems with antimony (Sb) and humic acid (HA) is a global concern due to their potential risks to human health and environment. In this research, three-level-three-variable Box–Behnken design (BBD) was investigated for simultaneous Sb(III) and total organic carbon (TOC) removal responses from groundwater by use of ferric chloride (FC) as a coagulant. This study focuses on three operating variables, including initial Sb(III) concentration (100, 550, and 1000 μg/L), HA concentration (2, 6, and 10 mgC/L) and FC dosages (20, 60, and 100 mg/L). The proposed quadratic model presented good correlation with experimental values having R2 and adjusted R2 values of response variables (Sb(III): 0.9981 and 0.9956) and (TOC: 0.9935 and 0.9851), respectively. The most pronounced influence of FC dosage was observed in the removal responses of TOC and Sb(III). Interestingly, the model revealed that a high level of FC dosage had the same TOC removal potential regardless of increasing HA concentration. The statistical model for both Sb(III) and TOC responses was used to optimize the experimental conditions. Moreover, the experimental results were successfully validated with predicted values having high accuracy. The sludge volume produced for studied variables followed the decreasing order as FC dosage > HA concentration > Sb(III) concentration. Under optimum conditions, 0.45 mL/L sludge volume was produced in the treatment of ground water in Nawabshah. In general, the results of the current study may provide some insights into the predictability of simultaneous removal performance of Sb species and organic substances from groundwater.

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“…The stabilization mechanism may be the direct reaction between iron ions and Sb to form a precipitate, as well as the adsorption of Sb by its hydrolysate. The results of Inam et al (2022) showed that the presence of inorganic and organic matter changes the physicochemical properties of iron salt precipitate, thereby affecting the adsorption and precipitation of antimony anions during the stabilization process.…”

Section: Sulfate Affect the Mobility Of Arsenic Andmentioning

confidence: 99%

In-situ stability assessment and remediation mechanism of typical antimony (Sb) tailings by combined organic-inorganic solid waste in Southwest China

Yang

Han

Luo

et al. 2022

Preprint

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To explore the feasibility of reusing solid waste to stabilize high-content antimony ore arsenic (As) and antimony (Sb) tailings, red mud, fly ash, dried sludge, ferrous sulfate (FeSO4), and rice husk ash were used as the stabilizer. Different combinations of stabilizers were used to stabilize the Sb tailings in Qinglong and Dushan. The morphological transformation and leaching characteristics of As and Sb in the treated tailing samples were determined. The results showed that the stabilizer was beneficial for adjusting the pH of the tailings and increasing the organic matter content. The combined treatment with 5% red mud, 10% fly ash, 5% dried sludge, 1% FeSO4, and 1% rice husk ash had the best stabilization effects on As and Sb. The best stabilization efficiencies of As and Sb in Dushan were 86.97% and 79.11%, respectively, and in Qinglong were 87.42% and 70.36%, respectively. The leaching concentrations of As and Sb decreased considerably under neutral conditions, promoting the transformation of As and Sb from exchangeable, oxidizable, and reducible states to the residue state. Furthermore, “Correlation heat maps” and X-ray diffraction (XRD) analyses were undertaken to evaluate the best performance of the stabilized samples, which is related to (1) the adsorption and precipitation mechanism of iron-aluminum (hydroxide) compounds in red mud and fly ash; (2) complexation and chelation of the rich organic matter; (3) the main hydration products calcium silicate hydrate (C-S-H), the As/Sb precipitation process and (4) the mechanism of pH inhibition by FeSO4.

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Coagulation Behavior of Antimony Oxyanions in Water: Influence of pH, Inorganic and Organic Matter on the Physicochemical Characteristics of Iron Precipitates

Cited by 4 publications

References 42 publications

<i>In-situ</i> Stability and Remediation of Typical Antimony (Sb) Tailings by Combined Solid Waste in Southwest China

<i>In-situ</i> Stability and Remediation of Typical Antimony (Sb) Tailings by Combined Solid Waste in Southwest China

Competitive Removal of Antimony and Humic Acid by Ferric Chloride: Optimization of Coagulation Process Using Response Surface Methodology

In-situ stability assessment and remediation mechanism of typical antimony (Sb) tailings by combined organic-inorganic solid waste in Southwest China

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