Cr(VI) reduction coupled with Cr(III) adsorption/ precipitation for Cr(VI) removal at near neutral pHs by polyaniline nanowires-coated polypropylene filters

Pi, Shuang-Yu; Wang, Yang; Pu, Chuan; Mao, Xiangzhou; Liu, Guangli; Wu, Haiming; Li, Hai

doi:10.1016/j.jtice.2021.05.019

Cited by 34 publications

(6 citation statements)

References 53 publications

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“…These results confirmed the bivalent and trivalent Fe elements existed in composites and also testified to the successful insertion of ferrocene into MIL-100(Fe). After the adsorption of Cr(VI) and imidacloprid, the binding energy of the Fe(III) peak shifted from 728.8 to 727.9 eV and from 725.9 to 725.4 eV and that of the Fe (II) 2p 1/2 peak shifted from 712.1 to 712.7 eV, which may suggest that uncoordinated active sites of Fe 3+ in Fc 2 -MIL-100(Fe) composites would interact with HCrO 4 – and imidacloprid; meanwhile, Fe 2+ in Fc would reduce Cr(VI) to Cr(III) . The high-resolution C spectra are shown in Figure d.…”

Section: Resultsmentioning

confidence: 99%

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Highly Efficient and Simultaneous Removal of Cr(VI) and Imidacloprid through a Ferrocene-Modified MIL-100(Fe) Composite from an Aqueous Solution

Xie

et al. 2022

Langmuir

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A novel nanocomposite ] was constructed by combining ferrocene (Fc) with the porous structural metal−organic framework ]. The proposed composite material could simultaneously and efficiently remove hexavalent chromium [Cr(VI)] and imidacloprid and reduced strongly noxious Cr(VI) to weakly noxious trivalent chromium [Cr(III)]. The removal efficiencies of the composite material for Cr(VI) and imidacloprid could reach 95% after 15 h. The adsorption process was determined by kinetics, isotherms, and thermodynamics. The results demonstrated that the adsorption kinetics of Cr(VI) followed the pseudosecond-order model mainly by chemisorption; meanwhile, the adsorption of imidacloprid by the material conformed to the pseudo-first-order kinetics, which indicated that physical adsorption was the main process. Additionally, the intraparticle diffusion model revealed that the uptake of imidacloprid and Cr(VI) occurred via intraparticle diffusion at the composite material. The adsorption procedure for Cr(VI) was fitted to the Langmuir model (R 2 = 0.995) via monolayer adsorption, and that for imidacloprid was fitted to the Freundlich model (R 2 = 0.995) due to multilayer or heterogeneous adsorption. The thermodynamic research confirmed that the adsorption procedure was exothermic and spontaneous. Infrared spectroscopy, X-ray photoelectron spectra, and the pH effect implied that intermolecular hydrogen bonding and electrostatic interaction played a crucial role during the removal process. Fc-MIL-100(Fe) also exhibited long-term stability and satisfactory regeneration and reusability. Therefore, this method may enhance an environmentally friendly and prospective approach for concurrently removing imidacloprid and Cr(VI) from wastewater.

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Section: Resultsmentioning

confidence: 99%

“…− and imidacloprid; meanwhile, Fe 2+ in Fc would reduce Cr(VI) to Cr(III). 56 The high-resolution C spectra are shown in Figure 8d. The C 1s peaks were located at 284.8 and 288.9 eV, which is consistent with the benzene and the carbonyl group of Fc 2 -MIL-100(Fe), respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Highly Efficient and Simultaneous Removal of Cr(VI) and Imidacloprid through a Ferrocene-Modified MIL-100(Fe) Composite from an Aqueous Solution

Xie

et al. 2022

Langmuir

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“…It is widely used in various industrial processes, such as electroplating, leather tanning, steelmaking and mining 3 , 4 . Among them, Cr(VI) is highly mobile in soil and aquatic systems, and its toxicity, mutagenicity and carcinogenicity are 500 times that of Cr(III) 5 , 6 , and its mutagenicity is about 1000 times that of Cr(III). It has been listed by the United States Environmental Protection Agency as one of the 17 chemicals that pose a major threat to humans 7 .…”

Section: Introductionmentioning

confidence: 99%

Removal of Cr(VI) from aqueous solution using ball mill modified biochar: multivariate modeling, optimization and experimental study

Tan,

Wang,

Zhan

et al. 2024

Sci Rep

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Chromium (Cr(VI)) pollution has attracted wide attention due to its high toxicity and carcinogenicity. Modified biochar has been widely used in the removal of Cr(VI) in water as an efficient and green adsorbent. However, the existing biochar prepared by chemical modification is usually complicated in process, high in cost, and has secondary pollution, which limits its application. It is urgent to explore modified biochar with simple process, low cost and environmental friendliness. Therefore, ball milling wheat straw biochar (BM-WB) was prepared by ball milling technology in this paper. The adsorption characteristics and mechanism of Cr(VI) removal by BM-WB were analyzed by functional group characterization, adsorption model and response surface method. The results showed that ball milling effectively reduced the particle size of biochar, increased the specific surface area, and more importantly, enhanced the content of oxygen-containing functional groups on the surface of biochar. After ball milling, the adsorption capacity of Cr(VI) increased by 3.5–9.1 times, and the adsorption capacity reached 52.21 mg/g. The adsorption behavior of Cr(VI) follows the pseudo-second-order kinetics and Langmuir isotherm adsorption model rate. Moreover, the Cr(VI) adsorption process of BM-WB is endothermic and spontaneous. Under the optimized conditions of pH 2, temperature 45 °C, and adsorbent dosage 0.1 g, the removal rate of Cr(VI) in the solution can reach 100%. The mechanism of Cr(VI) adsorption by BM-WB is mainly based on electrostatic attraction, redox and complexation. Therefore, ball milled biochar is a cheap, simple and efficient Cr(VI) removal material, which has a good application prospect in the field of remediation of Cr(VI) pollution in water.

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“…According to the National Discharge Standard of China (GB 18918-2002), the possible minimum concentrations of total Cr in the wastewater effluents are 0.05–0.1 mg L −1 ; therefore, a method to readily monitor and rapidly dispose total Cr in wastewater is urgently needed. 13–15…”

Section: Introductionmentioning

confidence: 99%

Tunable thiophene-based conjugated microporous polymers for the disposal of toxic hexavalent chromium

Kotp¹,

Torad²,

Nara³

et al. 2023

J. Mater. Chem. A

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Cr(VI) reduction coupled with Cr(III) adsorption/ precipitation for Cr(VI) removal at near neutral pHs by polyaniline nanowires-coated polypropylene filters

Cited by 34 publications

References 53 publications

Highly Efficient and Simultaneous Removal of Cr(VI) and Imidacloprid through a Ferrocene-Modified MIL-100(Fe) Composite from an Aqueous Solution

Highly Efficient and Simultaneous Removal of Cr(VI) and Imidacloprid through a Ferrocene-Modified MIL-100(Fe) Composite from an Aqueous Solution

Removal of Cr(VI) from aqueous solution using ball mill modified biochar: multivariate modeling, optimization and experimental study

Tunable thiophene-based conjugated microporous polymers for the disposal of toxic hexavalent chromium

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