A scalable three-dimensional porous λ-MnO2/rGO/Ca-alginate composite electroactive film with potential-responsive ion-pumping effect for selective recovery of lithium ions

Zheng, Zhang; Du, Xiaoze; Wang, Qiang; Gao, Fengfeng; Jin, Tongtong; Hao, Xiaogang; Ma, Pengfei; Li, Jun; Guan, Guoqing

doi:10.1016/j.seppur.2020.118111

Cited by 42 publications

(14 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was related to the fracture of the metal–oxygen bond in CoMn spinel, which confirmed the results of Raman spectra . In addition, a new band at 651 cm –1 was observed, which could be caused by the production of λ-MnO 2 …”

Section: Resultssupporting

confidence: 84%

See 1 more Smart Citation

Acid Etching-Induced In Situ Growth of λ-MnO₂ over CoMn Spinel for Low-Temperature Volatile Organic Compound Oxidation

Shan

Zhang

Zhao

et al. 2022

Environ. Sci. Technol.

View full text Add to dashboard Cite

Surface lattice oxygen is crucial to the degradation of volatile organic compounds (VOCs) over transition metal oxides according to the Mars–van Krevelen mechanism. Herein, λ-MnO2 in situ grown on the surface of CoMn spinel was prepared by acid etching of corresponding spinel catalysts (CoMn-Hx-Ty) for VOC oxidation. Experimental and relevant theoretical exploration revealed that acid etching on the CoMn spinel surface could decrease the electron cloud density around the O atom and weaken the adjacent Mn–O bond due to the fracture of the surface Co–O bond, facilitating electron transfer and subsequently the activation of surface lattice oxygen. The obtained CoMn-H1-T1 exhibited an excellent catalytic performance with a 90% acetone conversion at 149 °C, which is 42 °C lower than that of CoMn spinel. Furthermore, the partially maintained spinel structure led to better stability than pure λ-MnO2. In situ diffuse reflectance infrared Fourier transform spectroscopy confirmed a possible degradation pathway where adsorptive acetone converted into formate and acetate species and into CO2, in which the consumption of acetate was identified as the rate-limiting step. This strategy can improve the catalytic performance of metal oxides by activating surface lattice oxygen, to broaden their application in VOC oxidation.

show abstract

Section: Resultssupporting

confidence: 84%

“…35 In addition, a new band at 651 cm −1 was observed, which could be caused by the production of λ-MnO 2 . 36 3.3. DFT Study.…”

Section: Oxidation−reduction Properties and Reactivementioning

confidence: 99%

Acid Etching-Induced In Situ Growth of λ-MnO₂ over CoMn Spinel for Low-Temperature Volatile Organic Compound Oxidation

Shan

Zhang

Zhao

et al. 2022

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Despite their individual limitations, combining two or more traditional technologies or using them in tandem may simultaneously achieve high separation efficiency and high extraction capacity . Reported examples include the reaction-coupled separation technology , and electrochemically switched ion exchange. , We have previously proposed an adsorption-coupled electrochemical technique that combines lithium-ion sieves with an external electric field, resulting in excellent lithium extraction ability without using acids. , …”

Section: Introductionmentioning

confidence: 99%

“…13 Reported examples include the reactioncoupled separation technology 14, 15 and electrochemically switched ion exchange. 16,17 We have previously proposed an adsorption-coupled electrochemical technique that combines lithium-ion sieves with an external electric field, resulting in excellent lithium extraction ability without using acids. 18,19 Mn-based ion sieves have been developed for Li + extraction.…”

Section: Introductionmentioning

confidence: 99%

Bifunctional Modification Enhances Lithium Extraction from Brine Using a Titanium-Based Ion Sieve Membrane Electrode

Zhang

Cheng

Qin

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Salt lake brine has become a promising lithium resource, but it remains challenging to separate Li + ions from the coexisting ions. We designed a membrane electrode having conductive and hydrophilic bifunctionality based on the H 2 TiO 3 ion sieve (HTO). Reduced graphene oxide (RGO) was combined with the ion sieve to improve electrical conductivity, and tannic acid (TA) was polymerized on the surface of ion sieve to enhance hydrophilicity. These bifunctional modification at the microscopic level improved the electrochemical performance of the electrode and facilitated ion migration and adsorption. Poly(vinyl alcohol) (PVA) was used as a binder to further intensify the macroscopic hydrophilicity of the HTO/RGO-TA electrode. Lithium adsorption capacity of the modified electrode in 2 h reached 25.2 mg g −1 , more than double that of HTO (12.0 mg g −1 ). The modified electrode showed excellent selectivity for Na + /Li + and Mg 2+ /Li + separation and good cycling stability. The adsorption mechanism follows ion exchange, which involves H + /Li + exchange and Li−O bond formation in the [H] layer and [HTi 2 ] layer of HTO.

show abstract

“…It has the advantages of no secondary pollution, adaptability to low-concentration ions, high selectivity, and a controllable rate. To date, ESIX has been successfully applied to the selective separation of various anions and cations such as Li + , Cs + , Pb 2+ , Ni 2+ , and Cl – , I – , PO 4 3– , ClO 4 – , and DS – . Wherein the type and properties of film materials played a crucial role in the ESIX process.…”

Section: Introductionmentioning

confidence: 99%

An Electroactive BiOBr/PVDF/CB Film Electrode for Electrochemical Extraction of Bromine Ions from Brines

Gao

Zeng

et al. 2023

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

An electroactive bismuth oxybromide/polyvinylidene difluoride/carbon black(BiOBr/PVDF/CB) composite film electrode was fabricated that had a bromide ion trap (Br–-trap) effect obtained by prereleasing of Br– under reduction potential. The Br–-trap BiOBr/PVDF/CB film electrode was used for the selective extraction of Br– from salt lake brine by electrochemically switched ion exchange (ESIX) technology. Moreover, an industrially scalable ESIX pilot system was designed and the effects of different process parameters were investigated. In the ESIX system, the obtained film electrode exhibited efficient adsorption quantity, and remarkable selectivity owing to its special ion trap effect. The extraction capacity of Br– reached 67.10 mg g–1 with the separation factors of 2.06 and 7.13 for Br–/Cl– and Br–/NO3 –, respectively, and the desorption efficiency of the film electrode remained at 95.4% after seven repeated cycles. It manifested that the pilot system with the Br–-trap BiOBr/PVDF/CB film electrode is expected to provide a novel direction for practical industrial Br– extraction.

show abstract

A scalable three-dimensional porous λ-MnO2/rGO/Ca-alginate composite electroactive film with potential-responsive ion-pumping effect for selective recovery of lithium ions

Cited by 42 publications

References 57 publications

Acid Etching-Induced In Situ Growth of λ-MnO₂ over CoMn Spinel for Low-Temperature Volatile Organic Compound Oxidation

Acid Etching-Induced In Situ Growth of λ-MnO₂ over CoMn Spinel for Low-Temperature Volatile Organic Compound Oxidation

Bifunctional Modification Enhances Lithium Extraction from Brine Using a Titanium-Based Ion Sieve Membrane Electrode

An Electroactive BiOBr/PVDF/CB Film Electrode for Electrochemical Extraction of Bromine Ions from Brines

Contact Info

Product

Resources

About

A scalable three-dimensional porous λ-MnO2/rGO/Ca-alginate composite electroactive film with potential-responsive ion-pumping effect for selective recovery of lithium ions

Cited by 42 publications

References 57 publications

Acid Etching-Induced In Situ Growth of λ-MnO2 over CoMn Spinel for Low-Temperature Volatile Organic Compound Oxidation

Acid Etching-Induced In Situ Growth of λ-MnO2 over CoMn Spinel for Low-Temperature Volatile Organic Compound Oxidation

Bifunctional Modification Enhances Lithium Extraction from Brine Using a Titanium-Based Ion Sieve Membrane Electrode

An Electroactive BiOBr/PVDF/CB Film Electrode for Electrochemical Extraction of Bromine Ions from Brines

Contact Info

Product

Resources

About

Acid Etching-Induced In Situ Growth of λ-MnO₂ over CoMn Spinel for Low-Temperature Volatile Organic Compound Oxidation

Acid Etching-Induced In Situ Growth of λ-MnO₂ over CoMn Spinel for Low-Temperature Volatile Organic Compound Oxidation