Characterization studies of red mud modification processes as adsorbent for enhancing ferricyanide removal

Deihimi, Nazanin; Irannajad, Mehdi; Rezai, Bahram

doi:10.1016/j.jenvman.2017.10.037

Cited by 82 publications

(28 citation statements)

References 39 publications

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“…More sophisticated fields are red mud-polymer composite panels as wood substitute [39], geopolymers [40,41], iron rich cement [42], radiopaque materials [43]. It might be also disposed as road base material [44] and in sewage treatment [45,46] as sorbent for removal of lead, chromium, arsenic [19,[46][47][48][49][50], fluoride [18,[50][51][52][53][54][55][56][57][58][59], cadmium, zinc [60] from aqueous solutions. Applications for CO 2 sequestration of industrial emissions were also tested [21].…”

Section: Introductionmentioning

confidence: 99%

Control of Carbon Dioxide Sequestration by Mechanical Activation of Red Mud

Mucsi

Halyag

Kurusta

et al. 2021

Waste Biomass Valor

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Mineral carbonation is a potentially attractive sequestration technology for the permanent safe disposal and immobilization of CO2. In this technology, CO2 is chemically reacted with calcium, sodium, and magnesium containing materials to form thermodynamically stable and environmentally harmless minerals, usually carbonates. In our research, mechanical activation of red mud was carried out in order to enhance its reactivity by means of mechanochemical reactions (surface activation), and its sequestration behaviour was investigated using carbon dioxide gas at 25 °C temperature and at high pressure (5 bar) in an autoclave. The reacted red mud was characterized by Fourier-transformed infrared spectrometer, scanning electron microscopy, X-ray diffraction, laser particle size analyzer, BET specific surface area measurement, and pH measurement. It was found that mechanical activation improved the CO2 sequestration ability by 1.7 wt% of red mud, as demonstrated by the above investigations. The pH of red mud slurry can be lowered by reacting it with carbon dioxide. During our measurements, the pH of the suspension decreased from 10 to 6.81. Furthermore, the carbonation process can be successfully used to decrease the amount of harmful PM10 (particles with a diameter of 10 μm or less) and PM2.5 (particles with a diameter of 2.5 μm or less) fraction. The proportion of 10 μm particles can be reduced by 40% and that of 2.5 μm by 20%. Graphic Abstract

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Section: Introductionmentioning

confidence: 99%

Control of Carbon Dioxide Sequestration by Mechanical Activation of Red Mud

Mucsi

Halyag

Kurusta

et al. 2021

Waste Biomass Valor

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“…Rychkov et al [8] intensi ed carbonate scandium leaching from bauxite red mud. It is possible to use red mud as adsorbent for enhancing ferricyanide removal [9]; or in mixes with y ash to reduce CO 2 emissions [10].…”

Section: Introductionmentioning

confidence: 99%

Structure Formation Processes and Green Ceramics Manufacturing from Hazardous Bauxite Red Mud and Ferrous Slag

Mymrin

Alekseev

Klitzke

et al. 2021

Preprint

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This paper reports the development and characterization of some new ceramic materials from hazardous bauxite red mud (50 to 100 wt.%) and blast furnace slag (10 and 50%). This research aimed to demonstrate the possibility of expanding the raw material base for ceramics production, completely replacing the traditional natural raw materials (clay and sand) by hazardous industrial wastes composites with increasing local and global sustainability. Studies on the physicochemical processes of the ceramic structure’s formation were conducted by the XRF, XRD, AAS, SEM with EDS, and LAMMA methods. Changes in flexural strength, linear shrinkage, water absorption, and density were determined during the sintering process at 1000°, 1050°, 1100°, 1150°, 1200°, and 1225°C. The ceramics` flexural strength after sintering at 1225°C reached 19.78 MPa due to the syntheses of the mainly glass-like structure formation, confirmed by SEM, EDS and isotopes LAMMA methods with the complete binding of the heavy metals.

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“…There is also a noticeable trend of using natural materials in adsorption, including both waste rocks [21] as well as agricultural waste materials [22]. The clays as well as other materials are often modified thermally [23,24] or chemically [25][26][27] to enhance their adsorptive properties. As reported in [28], clay minerals are good adsorbents for metals, such as Cd(II), Cr(III), Cr(VI), Hg(II), Co(II), Cu(II), Zn(II), Pb(II), Ni(II), and Mn(II).…”

Section: Introductionmentioning

confidence: 99%

Natural and Chemically Modified Post-Mining Clays—Structural and Surface Properties and Preliminary Tests on Copper Sorption

et al. 2019

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The structural and surface properties of natural and modified Pliocene clays from lignite mining are investigated in the paper. Chemical modifications are made using hydrofluoric acid (HF), sulfuric acid (H2SO4), hydrochloric acid (HCl), nitric acid (HNO3), sodium hydroxide (NaOH), and hydrogen peroxide (H2O2), at a concentration of 1 mol/dm3. Scanning electron microscopy is used to detect the morphology of the samples. Nitrogen adsorption isotherms were recorded to determine the specific surface area (SSA), mesoporosity, microporosity, and fractal dimensions. The raw clay has an SSA of 66 m2/g. The most promising changes in the structural properties are caused by modifications with HF or H2SO4 (e.g., the SSA increased by about 60%). In addition, the raw and modified clays are used in preliminary tests with Cu(II) sorption, which were performed in batch static method at initial Cu(II) concentrations of 25, 50, 80, 100, 200, 300, and 500 mg/dm3 in 1% aqueous suspensions of the clayey material. The maximum sorption of Cu(II) on the raw material was 15 mg/g. The structural changes after the modifications roughly reflect the capabilities of the adsorbents for Cu(II) adsorption. The modifications with HF and H2SO4 bring a similar improvement in Cu(II) adsorption, which is around 20–25% greater than for the raw material. The structural properties of investigated clays and their adsorptive capabilities indicate they could be used as low-cost adsorbents (e.g., for industrial water pretreatment).

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Characterization studies of red mud modification processes as adsorbent for enhancing ferricyanide removal

Cited by 82 publications

References 39 publications

Control of Carbon Dioxide Sequestration by Mechanical Activation of Red Mud

Control of Carbon Dioxide Sequestration by Mechanical Activation of Red Mud

Structure Formation Processes and Green Ceramics Manufacturing from Hazardous Bauxite Red Mud and Ferrous Slag

Natural and Chemically Modified Post-Mining Clays—Structural and Surface Properties and Preliminary Tests on Copper Sorption

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