Green Synthesis of Magnetic Adsorbent Using Groundwater Treatment Sludge for Tetracycline Adsorption

Qu, Zhan; Wu, Yuna; Zhu, Suiyi; Yu, Yang; Huo, Mingxin; Zhang, Leilei; Yang, Jiakuan; Bian, Dejun; Wang, Yi

doi:10.1016/j.eng.2019.06.001

Cited by 36 publications

(22 citation statements)

References 54 publications

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“…In China, smelting slag is disposed of as an environmental priority pollutant, wherein the slag is generally stabilized with cement before landfilling for safety purposes 4 . Although smelting slag is a potential source of various alloys [5][6][7] , it is difficult to recycle slag due to its complex impurities, such as Fe, Al, Si, Ca and high-molecular-weight organic matter, which are mainly derived from flocculants in smelting wastewater treatment 7,8 . The conventional method for recycling heavy metals from smelting slag is chemical leaching with a strong acid [5][6][7]9 .…”

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confidence: 99%

High-purity recycling of hematite and Zn/Cu mixture from waste smelting slag

Huo

Song

Zhu

et al. 2020

Sci Rep

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in this study, Zn/cu-bearing smelting slag was recycled via an integrated acid dissolution and hematite precipitation method. the slag was dissolved in nitric acid to generate an acid solution containing 23.5 g/L Fe, 4.45 g/L Zn and 2.81 g/L Cu, which was subjected to hydrothermal treatment with the addition of levulinic acid (LA). More than 99.95% of the initial Fe content was removed as hematite particles with diameters of approximately 200 nm, and the residual Fe concentration in the acid was 0.43 mg/L. The generated hematite contained 97.3% Fe 2 o 3 , 0.64% ZnO and 0.58% CuO. Greater than 99% of the initial Zn and Cu was retained in the acid and further precipitated as Zn/Cu-bearing solids by adjusting the solution pH to 9. The precipitated Zn/Cu-bearing solids contained 33.6% Zn and 21.7% Cu, whereas the Fe content was less than 0.2%. This paper is the first report of an environmentally friendly approach for recycling smelting slag without generating any hazardous waste.

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confidence: 99%

High-purity recycling of hematite and Zn/Cu mixture from waste smelting slag

Huo

Song

Zhu

et al. 2020

Sci Rep

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“…The conversion commonly initiated in the absence of reducing reagent, such as ascorbic acid. In our previous study, the impurity Si/Al oxides (quartz and boehmite) were dissolved to Si(OH) 4 − and Al(OH) 4 after hydrothermal treatment with 6 M NaOH, and then approximately 24.6% ferrihydrite in the Al/Fe-rich sludge was converted to maghemite [10]. The formation of maghemite conferred good magnetic response on the hydrothermal product.…”

Section: Plos Onementioning

confidence: 99%

“…When the magnetic species was incorporated into the industrial wastes, it conferred magnetic response on the wastes, so that the wastes can be easily separately from water in a magnetic field [8,9]. Thus, these wastes could be converted to magnetic adsorbent, which favors the wastes' separation and reduces the size of clarifier accordingly [10].…”

Section: Introductionmentioning

confidence: 99%

Upcycling of groundwater treatment sludge to magnetic Fe/Mn-bearing nanorod for chromate adsorption from wastewater treatment

Dong

Chen

et al. 2020

PLoS ONE

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Groundwater treatment sludge is a Fe/Mn-bearing waste that is mass produced in groundwater treatment plant. In this study, sludge was converted to a magnetic adsorbent (MA) by adding ascorbate. The sludge was weakly magnetised in the amorphous form with Fe and Mn contents of 28.8% and 8.1%, respectively. After hydrothermal treatment, Fe/Mn oxides in the sludge was recrystallised to siderite and rhodochrosite, with jacobsite as the intermediate in the presence of ascorbate. With an increment in ascorbate dosage, the obtained magnetic adsorbent had a significant increase in chromate adsorption but a decrease in magnetisation. When the M ascorbate /M Fe molar ratio was 10, the produced MA-10 was a dumbbell-shaped nanorod with a length of 2-5 μm and a diameter of 0.5-1 μm. This MA-10 showed 183.2 mg/g of chromate adsorption capacity and 2.81 emu/g of magnetisation. The mechanism of chromate adsorption was surface coprecipitation of the generated Cr 3+ and Fe 3+ /Mn 4+ from redox reaction between chromate and siderite/rhodochrosite on MA-10, separately. This study demonstrated an efficient recycling route of waste sludge from groundwater treatment to produce MA for treating chromate-bearing wastewater.

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“…S1 and S2 were hydrothermally treated in accordance with our previous method [26,27] with the replacement of NaOH by Na 2 S. In brief, S1 (1 g), Na 2 S•9H 2 O (2.4 g) and deionized water (30 mL) were mixed in a 50 mL Teflon vessel. Then, the vessel was sealed and heated at 180 • C for 10 h in a drying oven (DHG-9037A, Jinghong company, Shanghai, China) and water-cooled to below 25 • C. Finally, the blackish particles at the vessel bottom were collected, freeze-dried at −80 • C in a freeze dryer (FDU-2110, EYELA, Tokyo, Japan) overnight and denoted as SP1.…”

Section: Hydrothermal Conversion Of Sludgementioning

confidence: 99%

“…During erdite hydrolysis, a redox reaction between surface Fe 3+ and the adjacent free SH − occurred [47], and thus surface-associated Fe 2+ , which stabilized the new Fe/S-bearing oxyhydroxide, was generated. Surface functional groups (Fe-SH and Fe-OH) are rich in new Fe/S-bearing oxyhydroxide, and H + ions on their sides were dissociated with vacuum surface sites (Fe-S − and Fe-O − ) under alkaline conditions [26]. The adjacent vacuum sites exhibited high affinity to complex Cu and Zn ( Figure 14) and competed with chelates, such as EDTA [49], leading to nearly 100% removal of Cu and Zn from the wastewater.…”

Section: Sp1 and Sp2 Characterisation After Electroplating Wastewatermentioning

confidence: 99%

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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Green Synthesis of Magnetic Adsorbent Using Groundwater Treatment Sludge for Tetracycline Adsorption

Cited by 36 publications

References 54 publications

High-purity recycling of hematite and Zn/Cu mixture from waste smelting slag

High-purity recycling of hematite and Zn/Cu mixture from waste smelting slag

Upcycling of groundwater treatment sludge to magnetic Fe/Mn-bearing nanorod for chromate adsorption from wastewater treatment

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

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