Novel preparation of sludge-based spontaneous magnetic biochar combination with red mud for the removal of Cu2+ from wastewater

Ji, Gang; Li, Huidong; Cheng, Tianjia; Tian, Yuanli; Liu, Peizu; Guo, Jing; Cui, Kai; Ma, Ruirui; Ma, Xiaoyan; Cui, Fengjiao; Chen, Chen

doi:10.1016/j.cplett.2022.139993

Cited by 17 publications

(3 citation statements)

References 52 publications

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“…As a major producer of alumina, China produced more than 120 million tons of red mud in 2022, with a cumulative stockpile of 1.7 billion tons. Red mud created with the Bayer process is used as an industrial by-product for other applications, such as building materials [1][2][3][4][5][6] and environmental [7][8][9][10], chemical [2,[11][12][13][14][15], agronomic [16][17][18][19], metallurgical [20][21][22] processes, and so on. Currently, building materials consume reused red mud the most.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Alkali in Bayer Red Mud: Content and Occurrence State in Different Structures

Wang,

Jing,

Zhang

et al. 2023

Sustainability

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The application of large amounts of red mud in the field of building materials is one of the main ways to reuse this material, but the high alkali content of red mud limits its application. In this paper, the washable alkali, removable alkali, and lattice alkali contents of Bayer red mud were studied, and the occurrence states of potassium and sodium in red mud were studied using XRD, IR, XPS, and NMR. On this basis, the removal mechanism for potassium and sodium in red mud was analyzed. The results showed that the Na in the red mud was mainly deposited in the shelf silicon voids of hydroxy sodalite (Na8(AlSiO4)6(OH)2(H2O)2) in the form of Si-O-Na or Al-O-Na. K is deposited in the shelf silico-oxygen void of potassium feldspar (KAlSi3O8) in the form of Si-O-K or Al-O-K. The washable Na and K contents of the mud were 13.7% and 4.47%; the alkali removal agent CaO removed 83.1% and 50.8% of Na and K in the red mud; and the lattice alkali Na and K contents were 3.20% and 44.8%, respectively. In the process of red mud dealkalization, Ca2+ ions can enter the internal voids of the hydroxyl sodalite and potassium feldspar silica skeleton and then replace Al3+ in the Si-O skeleton and Na+ and K+ in the skeleton voids. The replacement reaction changes the silica tetrahedron network structure, resulting in the disintegration of the frame-like silica tetrahedron in the hydroxyl sodalite and potassium feldspar, forming an isolated, island-like silica tetrahedron in hydrated garnet.

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Section: Introductionmentioning

confidence: 99%

Analysis of Alkali in Bayer Red Mud: Content and Occurrence State in Different Structures

Wang,

Jing,

Zhang

et al. 2023

Sustainability

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“… 18 HCl and H 2 SO 4 were used to reduce the alkali metals in red mud, 19 while KOH and ammonium oxalate were employed to create pores and to stabilize heavy metals in the red mud. 20 The addition of citric acid reduced pH and total alkalinity of red mud by increasing the solubility of Na, Ca and Al. 21 Direct utilization of red mud as a precursor for catalyst synthesis reduces operational costs, excludes prior treatment, and aligns with the principles of green chemistry, as it reduces the need for additional chemicals in the catalyst development process.…”

Section: Introductionmentioning

confidence: 99%

Direct synthesis of Fe-aluminosilicates from red mud for catalytic deoxygenation of waste cooking oil

Ramdhani,

Santoso,

Holilah

et al. 2023

RSC Adv.

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“…In some cases, waste was also used as a source for the magnetic part [40]. There exists a variety of iron-containing wastes that can serve as an excellent starting material for magnetic sorbents, such as red mud, [41,42] sewage sludge, [43,44] or electroplating sludge. Among these, the sludge obtained from aeration of ground water is especially suitable for this purpose, as it contains high amounts of iron, with small amounts of manganese as the main contamination.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Magnetic Nanostructured Composite Sorbent Only from Waste Materials

Bunge,

Leoștean,

Turcu

2023

Materials

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Water pollution is a big problem for the environment, and thus depollution, especially by adsorption processes, has garnered a lot of interest in research over the last decades. Since sorbents would be used in large quantities, ideally, they should be cheaply prepared in scalable reactions from waste materials or renewable sources and be reusable. Herein, we describe a novel preparation of a range of magnetic sorbents only from waste materials (sawdust and iron mud) and their performance in the adsorption of several dyes (methylene blue, crystal violet, fast green FCF, and congo red). The preparation is performed in a hydrothermal process and is thus easily scalable and requires little sophisticated equipment. The magnetic nanostructured materials were analyzed using FTIR, VSM, SEM/EDX, XRD, and XPS. For crystal violet as a pollutant, more in-depth adsorption studies were performed. It was found that the best-performing magnetic sorbent had a maximum sorption capacity of 97.9 mg/g for crystal violet (methylene blue: 149.8 mg/g, fast green FCF: 52.2 mg/g, congo red: 10.5 mg/g), could be reused several times without drastic changes in sorption behavior, and was easily separable from the solution by simply applying a magnet. It is thus envisioned to be used for depollution in industrial/environmental applications, especially for cationic dyes.

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Novel preparation of sludge-based spontaneous magnetic biochar combination with red mud for the removal of Cu2+ from wastewater

Cited by 17 publications

References 52 publications

Analysis of Alkali in Bayer Red Mud: Content and Occurrence State in Different Structures

Analysis of Alkali in Bayer Red Mud: Content and Occurrence State in Different Structures

Direct synthesis of Fe-aluminosilicates from red mud for catalytic deoxygenation of waste cooking oil

Synthesis of a Magnetic Nanostructured Composite Sorbent Only from Waste Materials

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