Comparative performance of green rusts generated in Fe0–electrocoagulation for Cd2+ removal from high salinity wastewater: Mechanisms and optimization

Xu, Longqian; Wu, Deli; Liu, Wei; Xu, Xiaojun; Cao, Guangzhu

doi:10.1016/j.jenvman.2019.02.025

Cited by 12 publications

(3 citation statements)

References 55 publications

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“…Huge amounts of inorganic salts are present in wastewaters from mining, electroplating, and novel materials manufacturing industries. 32,45,46 The copresence of salts could either consume the active sites or inhibit the adsorption of target HMIs by changing the form of HMIs. 47 For instance, Cu(II) can react with Cl À to form CuCl 2 molecules well as CuCl 3 À and CuCl 4 2À anions for higher concentrations of Cl À .…”

Section: Effect Of Inorganic Salts On Adsorptionmentioning

confidence: 99%

Highly efficient removal of Cu(ii) by novel dendritic polyamine–pyridine-grafted chitosan beads from complicated salty and acidic wastewaters

Wang

Ling

et al. 2020

RSC Adv.

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Section: Effect Of Inorganic Salts On Adsorptionmentioning

confidence: 99%

Highly efficient removal of Cu(ii) by novel dendritic polyamine–pyridine-grafted chitosan beads from complicated salty and acidic wastewaters

Wang

Ling

et al. 2020

RSC Adv.

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“…The electrocoagulation (EC) process is generally used as wastewater treatment, this technique produces sludge and this use is related with the waste solid disposal. A new focus in the production of new materials by EC is emerging [2], [3], [4]. The LDH materials was prepared by Electrocoagulation according to methodology reported by Molano et al.…”

Section: Datamentioning

confidence: 99%

Data on energy consumption in the production of layered double hydroxides

2019

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Electrocoagulation consists of the in-situ generation of the coagulant by the electro dissolution of sacrificial electrodes (Mg and Al). This technique, besides being normally used for water treatment, can be used to synthesize Layered Double Hydroxides (LDH) or Hydrotalcites (HT) such as green rust, MgAlCl/LDH, and other oxides as Magnetite. The HT has a high tendency for water in the interlayer to be replaced by anions, these exchange characteristics generate a high interest in the fields of drug administration, photodegradation, catalyst supports, supercapacitors, and water oxidation. There are several routes of synthesis for these compounds such as co-precipitation, hydrolysis of urea, hydrothermal treatment and a novel route by electrocoagulation (EC).This work discloses the data of the energy consumption at laboratory-scale production in the synthesis of hydrotalcite (HT) or Layered Double Hydroxides (LDH) by electrocoagulation, the values obtained through these experiments are intended to provide support due to the lack of information on the energy consumption of this novel production method. Aluminum and AZ31 electrodes were used as a cations source during two- and four-hours operation, at 50 °C with 5 mA cm−2 of current density, and 5 minutes of polarity change for Aluminum and 8 minutes for AZ31 (Magnesium alloy).

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“…Due to their ability to degrade NO 3 – , Fe 0 and iron minerals have been applied as packed media in filter columns for water treatment. − In soil and groundwater, green rust (GR) is a reactive reductant arising in iron-rich anoxic environments or produced from Fe 0 corrosion. , Structurally, GR comprises alternating trioctahedral Fe II and Fe III hydroxide layers with interlayer anions including sulfate, chloride, and carbonate. , Since the early reports of NO 3 – reduction, GR has received continuous attention as a reactive iron mineral for redox transformation of organic and inorganic solutes in water and as an important intermediate phase between Fe II and Fe III (hydro)xides. ,,, GR reduces NO 3 – to ammonium (NH 4 + ) forming magnetite as a stable product, and GR-mediated NO 3 – reduction is considered to play an important role in nitrogen cycling in environments where microbial activity is low. Other than NO 3 – and nitrite (NO 2 – ), GRs or GR-like substances have been reported to reduce chlorinated aliphatics and reducible metal contaminants. − …”

Section: Introductionmentioning

confidence: 99%

Abiotic Reduction of Nitrate and Chlorate by Green Rust

Zhang

Yan

Messan

et al. 2021

ACS Earth Space Chem.

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Fe-rich minerals are ubiquitous on the earth’s surface and on Mars, and interactions of iron minerals with chlorate (ClO3 –) and/or nitrate (NO3 –) may influence the redox cycling of chlorine and nitrogen in the terrestrial and Martian environments. The objective of this study was to investigate the reactivity of two different types of synthesized green rusts (GRs), chloride (Cl-GR) and sulfate (SO4-GR), for ClO3 – and NO3 – reduction. Cl-GR and SO4-GR were synthesized by co-precipitation from an FeII–FeIII (ferrous iron and ferric iron) solution with the addition of NaOH. Both Cl-GR and SO4-GR degraded ClO3 – much faster than NO3 –. There were no significant competitive effects on the reduction of ClO3 – or NO3 – when both species were present simultaneously. The FeII/FeIII ratio in GR had a strong influence on the rates and the extents of oxyanion transformation. Cl-GR with an FeII/FeIII ratio of 2:1 and 3:1 showed higher reactivity than 1:1 Cl-GR for both ClO3 – and NO3 – reduction. In comparison, SO4-GR with an FeII/FeIII ratio of 1:1 transformed ClO3 – at a higher rate than at FeII/FeIII ratios of 2:1 and 3:1. The pH effect was studied within a pH range of 4.5–8.5. More complete ClO3 – and NO3 – transformation was achieved at pH 4.5, and the apparent reaction rate constants decreased with increasing pH. In all experiments, nearly 100% of the initial ClO3 – (10 mg/L) was degraded by GR except for Cl-GR with an FeII/FeIII ratio of 1:1 at pH 8.5. However, for NO3 –, there was an initial rapid transformation followed by a period of slow or no transformation, implying the formation of passivating products that hindered continuous NO3 – reduction. FeII did not appear to degrade NO3 – or ClO3 – at detectable rates over the time period of interest (20 days), except at the highest concentration studied (1000 mg/L). The reactions between GR and ClO3 – or NO3 – have implications for the cycling of chlorine and nitrogen and the stability of iron minerals. On Mars, these reactions may help to understand the occurrence and distribution of ClO4 –, ClO3 –, and NO3 –.

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Comparative performance of green rusts generated in Fe0–electrocoagulation for Cd2+ removal from high salinity wastewater: Mechanisms and optimization

Cited by 12 publications

References 55 publications

Highly efficient removal of Cu(ii) by novel dendritic polyamine–pyridine-grafted chitosan beads from complicated salty and acidic wastewaters

Highly efficient removal of Cu(ii) by novel dendritic polyamine–pyridine-grafted chitosan beads from complicated salty and acidic wastewaters

Data on energy consumption in the production of layered double hydroxides

Abiotic Reduction of Nitrate and Chlorate by Green Rust

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