Enhancing Cd(II) sorption by red mud with heat treatment: Performance and mechanisms of sorption

Yang, Tianxue; Wang, Yongfeng; Sheng, Lianxi; He, Chunguang; Sun, Wei; He, Qiang

doi:10.1016/j.jenvman.2019.109866

Cited by 55 publications

(18 citation statements)

References 73 publications

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“…However, the final removal effect could not reach the specified concentration limit due to the low adsorption capacity and strength structure of red mud. To further enhance the adsorption performance of red mud, scholars have adopted different activation methods, such as acidification 14 , 15 , heating 16 , soaking in sea water 17 . For example, some researchers have adopted simple acid activation and then precipitated red mud with ammonia to explore the possibility and adsorption rate of Cd 2+ removal in water 18 .…”

Section: Introductionmentioning

confidence: 99%

“…For example, some researchers have adopted simple acid activation and then precipitated red mud with ammonia to explore the possibility and adsorption rate of Cd 2+ removal in water 18 . In addition, it is found that the adsorption stability of red mud for Cd 2+ treated at 500 °C is almost twice that of the original red mud via studying the effect of heat treatment temperature on the adsorption capacity of Red mud for Cd 2+ 16 . However, the aforementioned modification methods are either costly to modify or have other problems, such as consuming too much thermal energy, difficult to perform, or low adsorption efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Cadmium adsorption performance and mechanism from aqueous solution using red mud modified with amorphous MnO2

Pang

Zhao

et al. 2022

Sci Rep

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In this study, red mud modified by manganese dioxide(MRM) was utilized as an adsorbent to effectively remove Cd2+ from aqueous solution. The characteristics were analysed by SEM–EDS, XRD, BET, FTIR and XPS. Different factors that affected the Cd2+ removal on MRM, such as dosage, initial pH, initial Cd2+ concentration, were investigated using batch adsorption experiments. Simultaneously, the adsorption kinetics, adsorption isotherms and adsorption thermodynamics of Cd2+ were also investigated using adsorption experiments data. The characterization results showed that MRM had a rougher, larger specific surface area and pore volume (38.91 m2 g−1, 0.02 cm3 g−1) than RM (10.22 m2 g−1, 0.73 cm3 g−1). The adsorption experiments found that the equilibrium adsorption capacity of MRM for Cd2+ was significantly increased to 46.36 mg g−1, which was almost three times that of RM. According to the fitting results, the pseudo-second-order kinetic model described the adsorption process better than the pseudo-first-order kinetic model. The Langmuir model fitted the adsorption isotherms well, indicating that the adsorption process was unimolecular layer adsorption and the maximum capacity was 103.59 mg g−1. The thermodynamic parameters indicated that the adsorption process was heat-trapping and spontaneous. Finally, combined XPS and FTIR studies, it was speculated that the adsorption mechanisms should be electrostatic attachment, specific adsorption (i.e., Cd–O or hydroxyl binding) and ion exchange. Therefore, manganese dioxide modified red mud can be an effective and economical alternative to the removal of Cd2+ in the wastewater treatment process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cadmium adsorption performance and mechanism from aqueous solution using red mud modified with amorphous MnO2

Pang

Zhao

et al. 2022

Sci Rep

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“…This technology is designed to reduce the mobility and biological impact of toxic heavy metals (THM S ) in soils through the addition of exogenous soil amendments and a series of physical and chemical reactions affecting the speciation of THM S . Commonly used immobilization amendments of heavy metal contaminated soil mainly include lime substances [13], modified coal fly ash [14], red mud [15,16], clay minerals, biochar [9], phosphates, iron, and iron oxides. In addition, as an important research direction in the field of environmental science, iron-based materials and biochar have great application potential in improving soil remediation.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Passivator Synthesized by Wastes of Iron Tailings and Biomass on the Leachability of Cd/Pb and Safety of Pak Choi (Brassica chinensis L.) in Contaminated Soil

Yang

2021

Processes

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Cadmium (Cd) and lead (Pb) carry a high heavy-metal-toxic risk for both animals and plants in soil. In this study, iron-based biochar (T-BC) was prepared by co-pyrolysis using wastes of iron tailings and biomass with urea as the functioning agents. Field-emission scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and toxicity-characteristic leaching procedure (TCLP) methods were employed to analyze the physicochemical characteristics of T-BC. Additionally, a pot trial was conducted to examine the effects of T-BC on the physiological characteristics of pak choi (Brassica campestris L.), the availability of heavy metals, and enzyme activities in the soils. The results show that toxic metals have been volatilized by the roasting process and immobilized within T-BC via the formation of stable metal-compounds during the co-pyrolysis process, which satisfies the requirements of a soil passivator. Incubation experiments showed that the DTPA-extractable Cd and Pb in contaminated soils decreased with an increasing amendment rate. Moreover, in the pot experiments, by adding 1% (w/w) T-BC into soils, the soils benefited from its large adsorption, complex precipitation, and immobilization capacity. Approximately 36% Cd and 29% Pb concentrations of edible parts in pak choi were reduced. The amendment proved promising for the stabilization of Cd and Pb in contaminated soils, while providing a strategy for solving the residual waste of tailings and biomass.

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“…Também foi constatado nesse mesmo material um aumento na cristalinidade de hematita com o aquecimento até 900 o C e a transformação de uma pequena quantidade de hematita em magnetita a 827 o C (YANG et al, 2020). Temperatura entre 400 e 600 °C também provoca uma perda de massa associada ao processo de desidroxilação da caulinita (KÄMPF, CURI, 2003).…”

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“…O tratamento térmico realizado entre 200 a 900 o C em um subproduto da indústria de alumínio rico em óxido de ferro contribuiu para elevar a retenção de cadmio com substancial aumento na área superficial específica e na quantidade adsorvida a 500 o C (YANG et al, 2020). A alteração no subproduto da indústria de alumínio também foi comprovada para a adsorção de cádmio e chumbo, cujo tratamento térmico até 600 o C não elevou as porcentagens adsorvidas desses elementos, mas contribuiu para reduzir as suas porcentagens dessorvidas (COSTA et.…”

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Caracterização e capacidade sortiva de elementos potencialmente tóxicos de um subproduto da indústria cerâmica

Silva¹

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Dedico este trabalho a minha família fonte de minhas forças a minha filha que mesmo ainda em meu ventre me enche de alegria a cada momento e a meu orientador Enio que formou e sonhou desde o princípio com esta ideia e sempre acreditou em mim AGRADECIMENTOS Agradeço: Ao técnico responsável pelo Laboratório de Ciência do Solo (LCSOL), o servidor Paulo Magalhães Neto, pelo auxílio nas análises laboratoriais; Aos professores Dr. Bruno Teixeira Ribeiro, Dr. Bruno Nery Fernandes Vasconcelos e Dr. Guilherme Lopes pelas sugestões no trabalho e participação com membros da banca de minha qualificação e defesa; À Universidade Federal de Uberlândia, campus Monte Carmelo, e aos professores que contribuíram na construção do meu conhecimento;

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Enhancing Cd(II) sorption by red mud with heat treatment: Performance and mechanisms of sorption

Cited by 55 publications

References 73 publications

Cadmium adsorption performance and mechanism from aqueous solution using red mud modified with amorphous MnO2

Cadmium adsorption performance and mechanism from aqueous solution using red mud modified with amorphous MnO2

Effect of a Passivator Synthesized by Wastes of Iron Tailings and Biomass on the Leachability of Cd/Pb and Safety of Pak Choi (Brassica chinensis L.) in Contaminated Soil

Caracterização e capacidade sortiva de elementos potencialmente tóxicos de um subproduto da indústria cerâmica

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