Rejeito de mineração de carvão como adsorvente para remoção da acidez, Fe (III), Al (III) e Mn (II) em drenagem ácida

Geremias, Reginaldo; Laus, Rogério; Fávere, Valfredo T.; Pedrosa, Rozangela Curi

doi:10.1590/s0100-40422010000800011

Cited by 6 publications

(1 citation statement)

References 11 publications

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“…The adsorption of metals at alkaline conditions is generally low since certain chemical groups only deprotonate at low pH values, allowing the binding of metals on the adsorbent surface (Boas et al, 2012). Decreases in removal percentage at high adsorbent dosages may be related to the saturation of adsorption sites (Alshameri et al, 2014), which was also reported by Fidelis (2015). In these cases, the reduction in removal capacity may be associated with the formation of adsorbent aggregates, which reduces their surface area, as well as demands changes in operational parameters (like speed) in order to ensure a suitable adsorbate/absorbent contact.…”

Section: Discussionmentioning

confidence: 67%

Removal of Cr(III) From Water By Polyurethane Foam Incorporated With Green Liquor Dregs Waste

Schoeler

Afonso

Delucis

et al. 2021

Preprint

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Water bodies contaminated by heavy metals cause a series of severe environmental and health issues. Chromium compounds stand out as one of the main contaminants since they are widely used by several industries. The low efficiency of effluent treatment facilities and the expensive sanitation procedures needed to remove metals from the water lead to serious concerns about the water quality in Brazil. In this study, a rigid polyurethane foam incorporated with green liquor dregs waste was prepared by the free expansion method. The foam composite and its isolated phases were evaluated for removing Cr(III) from water. The isolated dregs removed 81.93% of the Cr(III), which yielded a removal capacity of 135.45 mg·g-1. Whereas, the foam composite displayed Cr(III) removal percentage and capacity of 36.15% and 58.50 mg·g-1, respectively. Results suggests that the hybrid material may be considered for selective removal and extraction of Cr(III) from contaminated water.

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Section: Discussionmentioning

confidence: 67%

Removal of Cr(III) From Water By Polyurethane Foam Incorporated With Green Liquor Dregs Waste

Schoeler

Afonso

Delucis

et al. 2021

Preprint

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Removal of Cr(III) from water by polyurethane foam, green liquor dregs and polyurethane foam incorporated with green liquor dregs

Schoeler,

Okeke,

Afonso

et al. 2023

Materials Letters

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Removal of Fe2+ and Mn2+ from Polluted Groundwater by Insoluble Humic Acid/Tourmaline Composite Particles

Liu

Zhang

et al. 2022

Materials

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Insoluble humic acid/tourmaline composite particles (IHA/TM) were prepared by combining inorganic tourmaline (TM) with the natural organic polymer humic acid (HA) and carbonizing them at 330 °C to study the removal characteristics and mechanism of Fe2+ and Mn2+. The results showed that the optimal ratio of TM to IHA is 2:3. When the temperature of the IHA/TM composite particles was 35 °C and the pH was 6, the adsorption of Fe2+ and Mn2+ by IHA/TM reached equilibrium at 240 min. The optimum dose of the adsorbent was 10 g/L, and the equilibrium adsorption capacities of Fe2+ and Mn2+ were 5.645 mg/g and 3.574 mg/g, respectively. The process of IHA/TM adsorption of Fe2+ and Mn2+ in water was spontaneous, endothermic and sustainable, and cooling was not conducive to adsorption. The pseudo-second order kinetic equation can well reflect the adsorption mechanism of IHA/TM on Fe2+ and Mn2+, and the Langmuir adsorption model better describes the isothermal adsorption behaviour. The material characterisation and adsorption experiments indicate that surface coordination and chemical precipitation are the main mechanisms of Fe2+ and Mn2+ removal by IHA/TM.

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Rejeito de mineração de carvão como adsorvente para remoção da acidez, Fe (III), Al (III) e Mn (II) em drenagem ácida

Abstract: . The adsorbent removed 100% of Al (III), 100% of Fe (III) and 89% of Mn (II), suggesting its use as an alternative for the treatment of acid mine drainage.

Cited by 6 publications

References 11 publications

Removal of Cr(III) From Water By Polyurethane Foam Incorporated With Green Liquor Dregs Waste

Removal of Cr(III) From Water By Polyurethane Foam Incorporated With Green Liquor Dregs Waste

Removal of Cr(III) from water by polyurethane foam, green liquor dregs and polyurethane foam incorporated with green liquor dregs

Removal of Fe2+ and Mn2+ from Polluted Groundwater by Insoluble Humic Acid/Tourmaline Composite Particles

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