Valorization of manganese-containing groundwater treatment sludge by preparing magnetic adsorbent for Cu(II) adsorption

Zhu, Suiyi; Lin, Xingwen; Dong, Ge; Yu, Yang; Yu, Hao; Bian, Dejun; Zhang, Lanhe; Yang, Jiakuan; Wang, Xiaohong; Huo, Mingxin

doi:10.1016/j.jenvman.2019.01.117

Cited by 40 publications

(37 citation statements)

References 42 publications

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“…Thus, zinc adsorption on P-200 appeared to occur via exchange of Zn 2+ and ZnOH + with surface-bond Na + and H + (Equations (15) and (16)). A similar observation was reported in Zn 2+ adsorption on groundwater treatment sludge, which had the similar ≡SO − sites [23]. Of the three obtained adsorbents, P-200 had the optimal surface sites concentration (Hs), and thus exhibited the highest adsorption capacity.…”

Section: Adsorptionsupporting

confidence: 80%

“…Ascorbic acid was a typical reductant, and could react with andradite and hematite at room temperature [20,21]; however, the process was inhibited by the Si/Al coating (e.g., amorphous aluminosilicate) [22] on the surface of andradite and hematite. With the temperature increasing form 120 • C to 200 • C, similar to the dissolution of muscovite in red mud, the Si/Al coating on andradite and hematite was also attacked by hydroxyl with generation of SiO 3 2− and Al(OH) 4 − into the liquid fraction [23,24]. Thus, andradite and hematite were exposed to the liquid fraction, and reduced by ascorbic acid.…”

Section: Conversion Of Red Mud Into Magnetic Adsorbentmentioning

confidence: 94%

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Hydrothermal Conversion of Red Mud into Magnetic Adsorbent for Effective Adsorption of Zn(II) in Water

et al. 2019

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Red mud, a Fe-rich waste generated from the aluminum industry, was recovered as an adsorbent for wastewater treatment. The separation process of red mud from water after adsorption, including centrifugation and filtration, was complicated. This study demonstrated an alternative option to recycle red mud for preparing magnetic adsorbent via a facile hydrothermal route using ascorbic acid as reductant. Red mud is weakly magnetized and consists of andradite, muscovite, hematite, and cancrinite. After hydrothermal treatment, andradite in red mud was reductively dissolved by ascorbic acid, and transformed into magnetite and morimotoite. With increasing hydrothermal temperature, the dissolution of andradite accelerated, and the crystallite size of magnetite increased. When the hydrothermal temperature reached 200 °C, the prepared adsorbent P-200 showed a desirable saturation magnetization of 4.1 Am2/kg, and could be easily magnetically separated from water after adsorption. The maximum adsorption capacity of P-200 for Zn2+ was 89.6 mg/g, which is eight-fold higher than that of the raw red mud. The adsorption of Zn2+ by P-200 fitted the Langmuir model, where cation exchange was the main adsorption mechanism. The average distribution coefficient of Zn2+ at low ppm level was 16.81 L/g for P-200, higher than those of the red mud (0.3 L/g) and the prepared P-120 (1.48 L/g) and P-270 (5.48 L/g), demonstrating that P-200 had the best adsorption capacity for Zn2+ and can be served as a practical adsorbent for real-world applications. To our knowledge, this is the first study to report the conversion of red mud into a magnetic adsorbent under mild conditions.

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Section: Adsorptionsupporting

confidence: 80%

Section: Conversion Of Red Mud Into Magnetic Adsorbentmentioning

confidence: 94%

Hydrothermal Conversion of Red Mud into Magnetic Adsorbent for Effective Adsorption of Zn(II) in Water

et al. 2019

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“…Fe impurity in the acid solution of scrap was successfully separated via a one-step hydrothermal route with fructose as the auxiliary reagent. Through this method, fructose was oxidised by nitrate with the involvement of H + in the acid, steadily increasing the acid's pH and enhancing the hydrolysis The newly generated FeOOH was weakly crystallised and had numerous hydroxyl groups for rare-earth element coordination [19,27]. However, competition adsorption occurred between H + and the rare-earth elements on the newly formed FeOOH surface in the presence of sufficient H + , releasing rare-earth elements into the acid.…”

Section: Resultsmentioning

confidence: 99%

“…As the redox reaction continued, acid pH increased steadily (Figure 8), promoting the hydrolysis of ferric Fe to form the initial product FeOOH. The newly generated FeOOH was weakly crystallised and had numerous hydroxyl groups for rare-earth element coordination [19,27]. However, competition adsorption occurred between H + and the rare-earth elements on the newly formed FeOOH surface in the presence of sufficient H + , releasing rare-earth elements into the acid.…”

Section: Hematite Precipitation Mechanismmentioning

confidence: 99%

Resource Recovery of Waste Nd–Fe–B Scrap: Effective Separation of Fe as High-Purity Hematite Nanoparticles

Zhu

Chen

et al. 2020

Sustainability

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Recycling rare-earth elements from Nd magnet scrap (Nd–Fe–B scrap) is a highly economical process; however, its efficiency is low due to large portions of Fe impurity. In this study, the effective separation of Fe impurity from scrap was performed through an integrated nitric acid dissolution and hydrothermal route with the addition of fructose. Results showed that more than 99% of the scrap was dissolved in nitric acid, and after three dilutions that the Nd, Pr, Dy and Fe concentrations in the diluted acid were 9.01, 2.11, 0.37 and 10.53 g/L, respectively. After the acid was hydrothermally treated in the absence of fructose, only 81.8% Fe was removed as irregular hematite aggregates, whilst more than 98% rare-earth elements were retained. By adding fructose at an Mfructose/Mnitrate ratio of 0.2, 99.94% Fe was precipitated as hematite nanoparticles, and the loss of rare-earth elements was <2%. In the treated acid, the residual Fe was 6.3 mg/L, whilst Nd, Pr and Dy were 8.84, 2.07 and 0.36 g/L, respectively. Such composition was conducive for further recycling of high-purity rare-earth products with low Fe impurity. The generated hematite nanoparticles contained 67.92% Fe with a rare-earth element content of <1%. This value meets the general standard for commercial hematite active pharmaceutical ingredients. In this manner, a green process was developed for separating Fe from Nd–Fe–B scrap without producing secondary waste.

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“…During the hydrothermal process, Si/Al-bearing compounds were dissolved [38], thereby forming Si(OH) 4 and Al(OH) 4 − in accordance with the high concentration of Si/Al in the supernatant (Figure 4).…”

Section: Conversion Of the Two Types Of Sludge To Erdite-bearing Partmentioning

confidence: 93%

Upcycling of Electroplating Sludge to Prepare Erdite-Bearing Nanorods for the Adsorption of Heavy Metals from Electroplating Wastewater Effluent

Liu

Khan

Wang

et al. 2020

Water

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Electroplating sludge is a hazardous waste produced in plating and metallurgical processes which is commonly disposed of in safety landfills. In this work, electroplating sludge containing 25.6% Fe and 5.5% Co (named S1) and another containing 36.8% Fe and 7.8% Cr (S2) were recycled for the preparation of erdite-bearing particles via a facile hydrothermal route with only the addition of Na2S·9H2O. In the sludges, Fe-containing compounds were weakly crystallized and spontaneously converted to short rod-like erdite particles (SP1) in the presence of Co or long nanorod (SP2) particles with a diameter of 100 nm and length of 0.5–1.5 μm in the presence of Cr. The two products, SP1 and SP2, were applied in electroplating wastewater treatment, in which a small portion of Co in SP1 was released in wastewater, whereas Cr in SP2 was not. Adding 0.3 g/L SP2 resulted in the removal of 99.7% of Zn, 99.4% of Cu, 37.9% of Ni and 53.3% of Co in the electroplating wastewater, with residues at concentrations of 0.007, 0.003, 0.33, 0.09 and 0.002 mg/L, respectively. Thus, the treated electroplating wastewater met the discharge standard for electroplating wastewater in China. These removal efficiencies were higher than those achieved using powdered activated carbon, polyaluminum chloride, polyferric sulfate or pure Na2S·9H2O reagent. With the method, waste electroplating sludge was recycled as nanorod erdite-bearing particles which showed superior efficiency in electroplating wastewater treatment.

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Valorization of manganese-containing groundwater treatment sludge by preparing magnetic adsorbent for Cu(II) adsorption

Cited by 40 publications

References 42 publications

Hydrothermal Conversion of Red Mud into Magnetic Adsorbent for Effective Adsorption of Zn(II) in Water

Hydrothermal Conversion of Red Mud into Magnetic Adsorbent for Effective Adsorption of Zn(II) in Water

Resource Recovery of Waste Nd–Fe–B Scrap: Effective Separation of Fe as High-Purity Hematite Nanoparticles

Upcycling of Electroplating Sludge to Prepare Erdite-Bearing Nanorods for the Adsorption of Heavy Metals from Electroplating Wastewater Effluent

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