Integrated use of magnetic nanostructured calcium silicate hydrate and magnetic manganese dioxide adsorbents for remediation of an acidic mine water

Briso, Alejandro; Quintana, Geraldine Ezquerra; Ide, Viviana; Basualto, Carlos; Molina, Lorena; Montes, Gonzalo; Valenzuela, Fernando

doi:10.1016/j.jwpe.2018.08.010

Cited by 15 publications

(6 citation statements)

References 26 publications

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“…The experimental values for the maximum sorption capacities deduced from the adsorption isotherms are represented in Figure 5 and Figure 6 and are presented in Table 4. Such levels of Pb 2+ concentration are in the range of contaminated mine waters [80,81].…”

Section: Resultsmentioning

confidence: 99%

Extraction and Characterization of Alginate from an Edible Brown Seaweed (Cystoseira barbata) Harvested in the Romanian Black Sea

et al. 2019

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Cystoseira barbata is an edible brown seaweed, traditionally used in the Black Sea area as functional food. Both alginate and brown seaweed biomass are well known for their potential use as adsorbents for heavy metals. Alginate was extracted from C. barbata recovered from the Romanian coast on the Black Sea with a yield of 19 ± 1.5% (w/w). The structural data for the polysaccharide was obtained by HPSEC-MALS, 1H-NMR. The M/G ratio was determined to be 0.64 with a molecular weight of 126.6 kDa with an intrinsic viscosity of 406.2 mL/g. Alginate beads were used and their adsorption capacity with respect to Pb2+ and Cu2+ ions was determined. The adsorption kinetics of C. barbata dry biomass was evaluated and it was shown to have an adsorption capacity of 279.2 ± 7.5 mg/g with respect to Pb2+, and 69.3 ± 2 with respect to Cu2+. Alginate in the form of beads adsorbs a maximum of 454 ± 4.7 mg/g of Pb2+ ions and 107.3 ± 1.7 mg/g of Cu2+ ions.

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Section: Resultsmentioning

confidence: 99%

Extraction and Characterization of Alginate from an Edible Brown Seaweed (Cystoseira barbata) Harvested in the Romanian Black Sea

et al. 2019

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“…It was then used as a solid support for SDS to further bind with 1-(2-pyridylazo)-2-naphthol as the adsorption site for Co(II), in a lab-on-valve sequential injection analysis system. Amorphous calcium silicate (CaSiO 3 ) and manganese dioxide (MnO 2 )-coated Fe 3 O 4 were prepared separately by Briso et al [ 169 ], who evaluated it for the removal of multi-elements from acidic mine water. They found that approximately 90% of the heavy metal ions were removed by using only CaSiO 3 -coated Fe 3 O 4 in the first step, whereas the MnO 2 -coated Fe 3 O 4 decreased the concentration of toxic metal ions to below the permissible contamination levels, in the second step.…”

Section: Conventional Synthesis Methods Of Magnetic Adsorbentsmentioning

confidence: 99%

Magnetic Adsorbents for Wastewater Treatment: Advancements in Their Synthesis Methods

et al. 2022

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The remediation of water streams, polluted by various substances, is important for realizing a sustainable future. Magnetic adsorbents are promising materials for wastewater treatment. Although numerous techniques have been developed for the preparation of magnetic adsorbents, with effective adsorption performance, reviews that focus on the synthesis methods of magnetic adsorbents for wastewater treatment and their material structures have not been reported. In this review, advancements in the synthesis methods of magnetic adsorbents for the removal of substances from water streams has been comprehensively summarized and discussed. Generally, the synthesis methods are categorized into five groups, as follows: direct use of magnetic particles as adsorbents, attachment of pre-prepared adsorbents and pre-prepared magnetic particles, synthesis of magnetic particles on pre-prepared adsorbents, synthesis of adsorbents on preprepared magnetic particles, and co-synthesis of adsorbents and magnetic particles. The main improvements in the advanced methods involved making the conventional synthesis a less energy intensive, more efficient, and simpler process, while maintaining or increasing the adsorption performance. The key challenges, such as the enhancement of the adsorption performance of materials and the design of sophisticated material structures, are discussed as well.

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“…To circumvent this problem, researchers focused on altering the magnetic properties by incorporating iron oxides such as magnetite (Fe 3 O 4 ) and maghemite (g-Fe 2 O 3 ) to improve separation from the solution and the adsorption capacity. Briso et al (2018) reported on good separation of the magnetic coated Fe 3 O 4 nanostructured calcium silicate hydrate (mag-NanoCSH) and manganese oxide (mag-MnO 2 ) from solution. It was noted that the presence of iron in the nanosorbent had a major role in the removal of As through formation of water insoluble and stable double iron and calcium arsenate salts (Briso et al 2018).…”

Section: Magnetic Sorbentsmentioning

confidence: 99%

“…Briso et al (2018) reported on good separation of the magnetic coated Fe 3 O 4 nanostructured calcium silicate hydrate (mag-NanoCSH) and manganese oxide (mag-MnO 2 ) from solution. It was noted that the presence of iron in the nanosorbent had a major role in the removal of As through formation of water insoluble and stable double iron and calcium arsenate salts (Briso et al 2018). In another study, Barrera et al (2017) reported nanostructured calcium silicate hydrate, unmodified or modified with Fe (III), for removal of heavy metals such as Cd (II), Cu (II) and Zn (II) from acidic aqueous solutions.…”

Section: Magnetic Sorbentsmentioning

confidence: 99%

Recent developments in materials used for the removal of metal ions from acid mine drainage

Mokgehle

Tavengwa

2021

Appl Water Sci

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Acid mine drainage is the reaction of surface water with sub-surface water located on sulfur bearing rocks, resulting in sulfuric acid. These highly acidic conditions result in leaching of non-biodegradeable heavy metals from rock which then accumulate in flora, posing a significant environmental hazard. Hence, reliable, cost effective remediation techniques are continuously sought after by researchers. A range of materials were examined as adsorbents in the extraction of heavy metal ions from acid mine drainage (AMD). However, these materials generally have moderate to poor adsorption capacities. To address this problem, researchers have recently turned to nano-sized materials to enhance the surface area of the adsorbent when in contact with the heavy metal solution. Lately, there have been developments in studying the surface chemistry of nano-engineered materials during adsorption, which involved alterations in the physical and chemical make-up of nanomaterials. The resultant surface engineered nanomaterials have been proven to show rapid adsorption rates and remarkable adsorption capacities for removal of a wide range of heavy metal contaminants in AMD compared to the unmodified nanomaterials. A brief overview of zeolites as adsorbents and the developent of nanosorbents to modernly applied magnetic sorbents and ion imprinted polymers will be discussed. This work provides researchers with thorough insight into the adsorption mechanism and performance of nanosorbents, and finds common ground between the past, present and future of these versatile materials.

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Integrated use of magnetic nanostructured calcium silicate hydrate and magnetic manganese dioxide adsorbents for remediation of an acidic mine water

Cited by 15 publications

References 26 publications

Extraction and Characterization of Alginate from an Edible Brown Seaweed (Cystoseira barbata) Harvested in the Romanian Black Sea

Extraction and Characterization of Alginate from an Edible Brown Seaweed (Cystoseira barbata) Harvested in the Romanian Black Sea

Magnetic Adsorbents for Wastewater Treatment: Advancements in Their Synthesis Methods

Recent developments in materials used for the removal of metal ions from acid mine drainage

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