Photocatalytic CO2 reduction and environmental remediation using mineralization of toxic metal cations products

Lai, Tianyi; Wang, Jikang; Xiong, Wenbo; Wang, Huijuan; Yang, Mufei; Li, Tian; Kong, Xianggui; Zou, Xiaoxin; Zhao, Yufei; O’Hare, Dermot; Song, Yu‐Fei

doi:10.1016/j.ces.2022.117704

Cited by 20 publications

(18 citation statements)

References 56 publications

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“…Figure shows XRD patterns for the as-synthesized monolayered MgAl-LDH (denoted as MgAl-mono) and the MgAl-mono- x samples prepared by calcining MgAl-mono at different temperatures ( x ) from 150 to 700 °C. The XRD of MgAl-mono was consistent with previous reports for monolayer MgAl-LDH nanosheets, showing an obvious (110) reflection around 60°. Besides, Figure S1 is the XRD pattern of MgAl-mono structure redispersing in water.…”

Section: Resultssupporting

confidence: 90%

“…Our mineralization studies revealed that MgAl-mono-350 transformed into a CdMgAl-LDH during the mineralization of Cd 2+ ions. The mechanism of the mineralization process was further investigated by density functional theory (DFT) calculations. − The chemical reaction is described as follows: Mg 12 Al 4 (OH) 32 (BO 3 ) 4/3 + x Cd 2+ → Cd x Mg 12‑ x Al 4 (OH) 32 (BO 3 ) 4/3 + x Mg 2+ , where x = 12 would correspond a complete isomorphic substitution process. We built two models to simulate the mineralization process.…”

Section: Resultsmentioning

confidence: 99%

“…Similar findings have also been reported elsewhere. 41 High-resolution transmission electron microscopy (HRTEM) images of MgAl-mono (Figure 3a−c) revealed a sheet-like structure, with the individual nanosheets having a lateral size of about 20 nm and a thickness of about 1 nm. Figure 3c shows lattice fringes with a spacing of 0.228 nm, corresponding to the (012) facets in MgAl-LDH.…”

Section: Mineralization Of CD 2+mentioning

confidence: 99%

“…The LDH structure can accommodate a wide range of divalent and trivalent cations; hence through isomorphous substitution processes, LDHs can offer excellent removal performance for certain heavy metal ions (like Cd 2+ , Ni 2+ , and Cu 2+ ions) leading to superstable mineralization structures (SSMS). 41 Recently, we reported that CaAl-LDH could be used as a mineralizer to selectively remove Cd 2+ ions from water with a capacity of 592 mg/g via isomorphous substitution to form a SSMS CdAl-LDH. 43 Owing to the high stability of the SSMS product, secondary pollution is avoided.…”

Section: Introductionmentioning

confidence: 99%

“…As a clay-like material, layered double hydroxides (LDHs) have been extensively researched in recent years for heavy metal removal. − LDHs typically have the general formula [(M 2+ ) 1– x (M 3+ ) x (OH) 2 ] x + (A m – ) x / m · n H 2 O] and a layered structure consisting of M 2+ and M 3+ cations octahedrally coordinated by oxygen in positively charged sheets, and anions (A m – ) and water in the interlayer region between the sheets. The LDH structure can accommodate a wide range of divalent and trivalent cations; hence through isomorphous substitution processes, LDHs can offer excellent removal performance for certain heavy metal ions (like Cd 2+ , Ni 2+ , and Cu 2+ ions) leading to superstable mineralization structures (SSMS). − Recently, we reported that CaAl-LDH could be used as a mineralizer to selectively remove Cd 2+ ions from water with a capacity of 592 mg/g via isomorphous substitution to form a SSMS CdAl-LDH . Owing to the high stability of the SSMS product, secondary pollution is avoided.…”

Section: Introductionmentioning

confidence: 99%

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Efficient and Superstable Mineralization of Toxic Cd²⁺ Ions through Defect Engineering in Layered Double Hydroxide Nanosheets

et al. 2023

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Water and soil pollution caused by toxic cadmium ions (Cd 2+ ) is a serious threat to animals, plants, and human health. Discovering low-cost mineralizers which can efficiently and stably immobilize Cd 2+ ions is therefore imperative for wastewater treatment and soil remediation. In this work, we report the successful development of a novel mineralizer for Cd 2+ ion capture. A magnesium−aluminum layered double hydroxide (MgAl-LDH) with a monolayer structure (MgAl-mono) was first prepared and then calcined at 350 °C for 4 h to produce a defective MgAl-mono-350. MgAl-mono-350 offered a very high Cd 2+ removal capacity (1385.5 mg/g at 25 °C) and the ability to reduce the concentration of Cd 2+ in aqueous solution from 100 ppm to less than 50 ppb in 15 min (meeting the discharge standard of industrial wastewater). Detailed characterization and computational studies revealed that MgAl-mono-350 possessed abundant oxygen defects, thereby enabling superstable mineralization of Cd 2+ via isomorphous substitution process,and the Cd 2+ ions are immobilized in the generated CdAl-LDH structure. MgAl-mono-350 also offered outstanding selectivity for Cd 2+ ions over other common ions. This work demonstrates the potential of defect-engineered LDH materials for the selective removal of heavy metals from polluted water.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Mineralization Of CD 2+mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficient and Superstable Mineralization of Toxic Cd²⁺ Ions through Defect Engineering in Layered Double Hydroxide Nanosheets

et al. 2023

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Recent Advances in the Large‐Scale Production of Photo/Electrocatalysts for Energy Conversion and beyond

Li,

Sun

et al. 2024

Advanced Energy Materials

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Photocatalysis and electrocatalysis have emerged as promising technologies for addressing the energy crisis and environmental issues. However, the widespread application of these technologies is hampered by the challenge of scaling up the production of photo/electrocatalysts that are not only highly active and stable but also cost‐effective and environmentally benign. This review delves into the latest advancements in the large‐scale synthesis of photo/electrocatalysts. The factors to be considered in the large‐scale production of catalysts are discussed first. The synthesis methods for batch preparation of photo/electrocatalysts are then comprehensively introduced, with a thorough discussion of their respective advantages and limitations. Moreover, the data analysis via machine learning techniques, which not only accelerates the identification and refinement of potential new catalysts but also offers insights for enhancing the high‐throughput synthesis of catalysts, is introduced in detail. Then the representative examples are presented to illustrate the applications of large‐scale catalysts in the field of industrial‐level photo/electrocatalysis. Finally, the challenges and prospects in the development of large‐scale production of photo/electrocatalysts are discussed. By bridging the gap between laboratory research and industrial application, this review aims to provide a reference for the future of large‐scale preparation of photo/electrocatalysts in sustainable energy conversion and beyond.

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Insight into the Mechanism of Cd²⁺ Removal by MgAl Layered Double Hydroxides with Different Host‐Guest Interactions

Bai

et al. 2023

Chemistry A European J

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Layered double hydroxides (LDHs) have shown great potential as adsorbents for the removal of heavy metals. Nevertheless, how the host‐guest interactions of LDHs affect the removal mechanism remains to be less explored. Herein, CO32−/NO3−/SO42−/Cl− intercalated MgAl‐LDHs with different host‐guest interactions were fabricated and their removal mechanism for Cd2+ was investigated. The removal capacity increased in the order of MgAl−CO3 (127.3 mg/g)

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Photocatalytic CO2 reduction and environmental remediation using mineralization of toxic metal cations products

Cited by 20 publications

References 56 publications

Efficient and Superstable Mineralization of Toxic Cd²⁺ Ions through Defect Engineering in Layered Double Hydroxide Nanosheets

Efficient and Superstable Mineralization of Toxic Cd²⁺ Ions through Defect Engineering in Layered Double Hydroxide Nanosheets

Recent Advances in the Large‐Scale Production of Photo/Electrocatalysts for Energy Conversion and beyond

Insight into the Mechanism of Cd²⁺ Removal by MgAl Layered Double Hydroxides with Different Host‐Guest Interactions

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Photocatalytic CO2 reduction and environmental remediation using mineralization of toxic metal cations products

Cited by 20 publications

References 56 publications

Efficient and Superstable Mineralization of Toxic Cd2+ Ions through Defect Engineering in Layered Double Hydroxide Nanosheets

Efficient and Superstable Mineralization of Toxic Cd2+ Ions through Defect Engineering in Layered Double Hydroxide Nanosheets

Recent Advances in the Large‐Scale Production of Photo/Electrocatalysts for Energy Conversion and beyond

Insight into the Mechanism of Cd2+ Removal by MgAl Layered Double Hydroxides with Different Host‐Guest Interactions

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Efficient and Superstable Mineralization of Toxic Cd²⁺ Ions through Defect Engineering in Layered Double Hydroxide Nanosheets

Efficient and Superstable Mineralization of Toxic Cd²⁺ Ions through Defect Engineering in Layered Double Hydroxide Nanosheets

Insight into the Mechanism of Cd²⁺ Removal by MgAl Layered Double Hydroxides with Different Host‐Guest Interactions