Reductive materials for remediation of hexavalent chromium contaminated soil – A review

Yang, Zhihui; Zhang, Xiaoming; Zhi, Jiang; Qi, Linlu; Huang, Peicheng; Zheng, Chujing; Liao, Qi; Yang, Weichun

doi:10.1016/j.scitotenv.2021.145654

Cited by 103 publications

(10 citation statements)

References 86 publications

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“…Besides, BET analysis performs after several reaction runs and illustrates that the Ce‐UiO‐66/FeCo 2 O 4 photocatalyst surface area has decreased surface area due to the redox reaction between Cr(VI) and Fe 0 , co‐precipitation between Cr(III) and Fe(III) occurs on the nanoparticles (Figure S9). As a result of this co‐precipitation, the photocatalyst holes are partially blocked [34] …”

Section: Resultsmentioning

confidence: 99%

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Construction of a Ce‐UiO‐66/MCo₂O₄ Heterojunction for Photocatalytic Cr(VI) Detoxification Through a p‐n Junction Formation Mechanism

Hosseinpour

Safarifard

2023

ChemPhotoChem

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Heterojunction engineering in catalyst structures is a promising approach to solve some restrictions in photocatalyst design, such as a narrow photoabsorption range and rapid recombination of photogenerated charge carriers. In this work, MCo2O4 (M=Mn, Zn, Fe) was synthesized using a template method. The porous MCo2O4 was composited by Ce‐UiO‐66 to form a heterojunction structure. The resultant material Ce‐UiO‐66/MCo2O4 had a hierarchically porous architecture and was used as a photocatalyst for Cr(VI) reduction. The coupling of Ce‐UiO‐66 and MCo2O4 resulted in a p‐n junction mechanism for charge carrier transfer. The Ce‐UiO‐66/MCo2O4 heterojunctions exhibited high Cr(VI) reduction ability under visible light irradiation over 120 min. The highest Cr(VI) photoreduction rate of the heterojunction is 14 times that of Ce‐UiO‐66. The binary heterojunction maintains high photoreduction efficiency (100 %) of Cr(VI) after four cycling tests showing excellent photocatalytic stability.

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Section: Resultsmentioning

confidence: 99%

“…As a result of this co-precipitation, the photocatalyst holes are partially blocked. [34] Finally, the leaching test can be used to check the absence of active metals in the aqueous solution. Using this method, Ce-UiO-66/FeCo 2 O 4 photocatalyst was investigated for further observations on stability and secondary pollution.…”

Section: Recyclabilitymentioning

confidence: 99%

Construction of a Ce‐UiO‐66/MCo₂O₄ Heterojunction for Photocatalytic Cr(VI) Detoxification Through a p‐n Junction Formation Mechanism

Hosseinpour

Safarifard

2023

ChemPhotoChem

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“…7−9 Drinking water stands out as a particularly vulnerable resource to Cr 2 O 7 2− contamination, ascribing to the high solubility of Cr 2 O 7 2− in water. 10,11 Consequently, the World Health Organization (WHO) has established a stringent maximum tolerable level of 0.05 mg/L for Cr 2 O 7 2− in drinking water. 12 Thus, rapid, convenient, and accurate monitoring of Cr 2 O 7 2− concentration is crucial for devising a reasonable and feasible treatment plan.…”

Section: Introductionmentioning

confidence: 99%

3D-Printed Fluorescent Hydrogel Consisting of Conjugated Polymer and Biomacromolecule for Fast and Sensitive Detection of Cr(VI) in Vegetables

Ding,

Sheng,

Zhang

et al. 2024

ACS Appl. Bio Mater.

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Portable fluorescent film sensors offer a solution to the contamination issue in homogeneous sensor detection systems. However, their special structure leads to low sensitivity and a long response time, resulting in a significant scientific challenge limiting their development and application. In this work, we propose a dual design strategy to prepare highly sensitive film sensors for rapidly detecting Cr 2 O 7 2− . Specifically, P(Fmoc-Osu)-SA hydrogel films were developed by integrating the biological macromolecule sodium alginate (SA) with the conjugated polymer poly(N-(9-Fluorenylmethoxycarbonyloxy)succinimide) (P(Fmoc-Osu)), using both mold and inkjet 3D printing methods. The "molecular wire effect" of the sensing unit P(Fmoc-Osu) and the water channel within the film substrate are responsible for the improved sensitivity and the reduced response time of this thin film sensor. P(Fmoc-Osu)-SA hydrogel films prepared by these two methods can rapidly detect Cr 2 O 7 2− with limits of detection of 1.18 and 0.078 nM, respectively. Considering that 3D-printed hydrogel films can be tailored to different shapes according to detection needs, the P(Fmoc-Osu)-SA hydrogel films produced from this method were effectively applied in vegetable samples. This study provides an innovative and effective strategy for the development of biocompatible hydrogel sensors that offer the potential for determining trace amounts of Cr 2 O 7 2− in agriculture.

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“…Nanoscale zero-valent iron (nZVI) has emerged as a particularly innovative detoxification tool with satisfactory Cr(VI) removal capacities, abundant surface-active sites, controllable particle size, and low toxicity. − However, serious technical challenges remain for the field application of nZVI . The aggregation and passivation of nZVI limits its mobility and thus impedes contact with Cr(VI) .…”

Section: Introductionmentioning

confidence: 99%

Cr(VI) Reduction and Fe(II) Regeneration by Penicillium oxalicum SL2-Enhanced Nanoscale Zero-Valent Iron

Luo

Pang

Peng

et al. 2023

Environ. Sci. Technol.

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Nanoscale zero-valent iron (nZVI) faces significant challenges in Cr(VI) remediation through aggregation and passivation. This study identified a Cr(VI)-resistant filamentous fungus (Penicillium oxalicum SL2) for nZVI activation and elucidated the synergistic mechanism in chromium remediation. P. oxalicum SL2 and nZVI synergistically and effectively removed Cr(VI), mainly by extracellular nonenzymatic reduction (89.1%). P. oxalicum SL2 exhibited marked iron precipitate solubilization and Fe(II) regeneration capabilities. The existence of the Fe(II)–Cr(V)-oxalate complex (HCrFeC4O9) indicated that in addition to directly reducing Cr(VI), iron ions generated by nZVI stimulated Cr(VI) reduction by organic acids secreted by P. oxalicum SL2. RNA sequencing and bioinformatics analysis revealed that P. oxalicum SL2 inhibited phosphate transport channels to suppress Cr(VI) transport, facilitated iron and siderophore transport to store Fe, activated the glyoxylate cycle to survive harsh environments, and enhanced organic acid and riboflavin secretion to reduce Cr(VI). Cr(VI) exposure also stimulated the antioxidative system, promoting catalase activity and maintaining the intracellular thiol/disulfide balance. Cr(VI)/Fe(III) reductases played crucial roles in the intracellular reduction of chromium and iron, while nZVI decreased cellular oxidative stress and alleviated Cr(VI) toxicity to P. oxalicum SL2. Overall, the P. oxalicum SL2–nZVI synergistic system is a promising approach for regenerating Fe(II) while reducing Cr(VI).

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Reductive materials for remediation of hexavalent chromium contaminated soil – A review

Cited by 103 publications

References 86 publications

Construction of a Ce‐UiO‐66/MCo₂O₄ Heterojunction for Photocatalytic Cr(VI) Detoxification Through a p‐n Junction Formation Mechanism

Construction of a Ce‐UiO‐66/MCo₂O₄ Heterojunction for Photocatalytic Cr(VI) Detoxification Through a p‐n Junction Formation Mechanism

3D-Printed Fluorescent Hydrogel Consisting of Conjugated Polymer and Biomacromolecule for Fast and Sensitive Detection of Cr(VI) in Vegetables

Cr(VI) Reduction and Fe(II) Regeneration by Penicillium oxalicum SL2-Enhanced Nanoscale Zero-Valent Iron

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Reductive materials for remediation of hexavalent chromium contaminated soil – A review

Cited by 103 publications

References 86 publications

Construction of a Ce‐UiO‐66/MCo2O4 Heterojunction for Photocatalytic Cr(VI) Detoxification Through a p‐n Junction Formation Mechanism

Construction of a Ce‐UiO‐66/MCo2O4 Heterojunction for Photocatalytic Cr(VI) Detoxification Through a p‐n Junction Formation Mechanism

3D-Printed Fluorescent Hydrogel Consisting of Conjugated Polymer and Biomacromolecule for Fast and Sensitive Detection of Cr(VI) in Vegetables

Cr(VI) Reduction and Fe(II) Regeneration by Penicillium oxalicum SL2-Enhanced Nanoscale Zero-Valent Iron

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Construction of a Ce‐UiO‐66/MCo₂O₄ Heterojunction for Photocatalytic Cr(VI) Detoxification Through a p‐n Junction Formation Mechanism

Construction of a Ce‐UiO‐66/MCo₂O₄ Heterojunction for Photocatalytic Cr(VI) Detoxification Through a p‐n Junction Formation Mechanism