RSC Advances
·
2017
·Vol. 7
·期 70
·44523-44530
·
IF 3.108
Lichen Xia,Lujun Pan,Muhammad Asif,Dongmei Zhang,Muhammad Usman,Shuaitao Yang,Nan Zhou,Yunping Hu,Yuezhen Bin
Ternary composites as electrode materials have attracted extensive attention due to their excellent electrochemical performance in energy-storage technologies as compared to single or binary composites. Herein, we demonstrated a facile two-step method to construct a new hierarchical nanocomposite by combing buckypaper (BP) with γ-MnOOH nanorods and polyaniline. BP is used as a conductive substrate for the synthesis of free-standing hierarchical electrodes. The structural characterizations revealed the growth of a hierarchical porous structure of the ternary electrode. The synthesized polyaniline@γ-MnOOH–BP ternary composite electrode shows a maximum specific capacitance of 567.5 F g−1 at a current density of 0.5 A g−1 and a relatively high areal capacitance of 301.2 mF cm−2 at a current density of 0.27 mA cm−2. This intriguing result is ascribed to the good combination of BP, γ-MnOOH, and PANI. We believe that this ternary composite electrode has potential in portable, environmentally friendly, and wearable applications for next generation energy-storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Lunjie Huang,Da-Wen Sun,Hongbin Pu,Qingyi Wei,Linpin Luo,Jianlong Wang
Despite the tremendous achievements of existing sensing techniques, sensitive and portable sensing of organophosphorus pesticides (OPs) in a non-polluting manner remains a challenging issue. This work proposed a facile colorimetric paper sensor using γ-MnOOH nanowires (NWs) as a degradable nanozyme and 3,3′,5,5′-tetramethylbenzidine (TMB) as a chromogenic indicator for rapid and sensitive screening of OPs and acetylcholinesterase (AChE) activity. The sensing mechanism was based on the easy disintegration of the oxidase-like γ-MnOOH NWs into invalid Mn 2+ ions by the selective reaction with thiocholine (TCh) produced by AChE and acetylthiocholine iodide (ATCh), triggering a remarkable activity loss of MnOOH nanozymes towards TMB oxidation. The concentration of OPs, as an AChE inhibitor, was measured by the changes in absorbance at 652 nm or blue color of oxTMB products. Such detection platform in solution state achieved relatively low limits of detection (LODs) for AChE activity (0.007 mU mL −1 ), and for two typical OPs, i.e., omethoate (0.35 ng mL −1 ) and dichlorvos (0.14 ng mL −1 ), respectively. Further, the portable assembly of such AChE-nanozyme tandem reaction on test paper performed well, reaching LODs of 0.1 mU mL −1 for AChE, 10 ng mL −1 for omethoate, and 3 ng mL −1 for dichlorvos, respectively. Meanwhile, this sensing system showed great selectivity and anti-interfering capacity in both solution and solid states, and worked well in real serum and vegetable samples. The abovementioned results, along with evidence of its good ecological sustainability, demonstrated the superiority of this well-performing platform for application in the food, environmental, and medical fields.
研究领域:
分析化学
·
环境科学
·
食品科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2015
·
IF 3.615
Yang Li,Lin-Dong Liu,Lu Liu,Ying Liu,Hong-Wei Zhang,Xu Han
In this study, three trivalent Mn (oxyhydr)oxides, bixbyite (α-Mn 2 O 3 ), hausmannite (Mn 3 O 4 ) and manganite (γ-MnOOH) were synthesized and used as persulfate (PS) activators in phenol oxidation. Of these three Mn (oxyhydr)oxides, only γ-MnOOH shows a good catalytic activity in PS activation with more than 80% phenol oxidized within 360 min in the full pH range. With increasing concentrations of PS and γ-MnOOH, phenol removal efficiency increased. TOC results also suggest that phenol oxidation at pH 11 is more complete than those at pH 7 and 3. We further confirm that mechanism involved in phenol oxidation is pH dependent in γ-MnOOH/PS system. Although SO 4 − and OH were both found under acidic and alkaline conditions, they did not contribute equally under different pHs. At pH 11, SO 4 − and OH generated from PS activation efficiently oxidize phenol. At pH 3, the strong oxidation activity of γ-MnOOH and an oxidative intermediate formed between S 2 O 8 2− and γ-MnOOH primarily contribute to phenol oxidation. At pH 7, an oxidative intermediate formed between γ-MnOOH and S 2 O 8 2− is the predominant oxidative species in phenol oxidation.
研究领域:
环境科学
·
化学
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产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2026
·
IF 9.2
Wenting Jia,Lin Guo,Zhao Yu,Zhiqiang Li,Pengge Ning,Hongbin Cao
The growing stream of end-of-life lithium-ion batteries from electronic and mobility products has created a pressing need to manage solid residues generated during battery-recycling operations. In ammonia-based leaching flowsheets used for selective critical metal recovery, manganese-rich solid residues (e.g., MnCO 3 or ammonium manganese sulfite/sulfate) are intentionally formed to avoid complex purification. Yet they are often retained as low-value waste due to impurities from unreacted cores. Here, we demonstrate a waste-to-resource pathway that bypasses solution phase recovery by upcycling manganese-rich residues directly into a γ-MnOOH alkaline oxygen evolution catalyst. The residue with MnCO 3 as the main precursor delivers the best performance, with an overpotential of 457.65 mV at 100 mA cm −2 and a Tafel slope of 60.37 mV dec −1 , demonstrating a favorable comparison with commercial noble metal and other benchmarks using commercial transition metal salts as raw materials. Structure-activity analysis attributes the performance to the preferential expression of the high-index facet. This direct solid-state route avoids reagent-grade manganese precursors, eliminates gypsum-forming steps, and cuts life cycle economic and energy demand. The work illustrates a practical waste-to-resource strategy that strengthens manganese security and advances circular economy goals in clean energy technologies.
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DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Ning Li,Mengting He,Xukai Lu,Lan Liang,Rui Li,Beibei Yan,Guanyi Chen
A valence-state heterojunction Mn 3 O 4 /γ-MnOOH was synthesized for norfloxacin (NOR) degradation under concurrent visible light and magnetic field. The charge carriers could transfer between the valence state components facilely, inhibiting recombination of photo-induced electron-holes significantly. Efficient NOR degradation by Mn 3 O 4 /γ-MnOOH was realized at 98.8% (rate constant of 0.0720 min −1 ) within 60 min under magnetic field assisted visible light. In neutral media, the positively charged NOR and negatively charged Mn 3 O 4 /γ-MnOOH would arrange in an oriented manner in the presence of magnetic field, providing more active sites for NOR during photocatalysis . Moreover, the opposite Lorentz forces contributed to the attractive interactions between NOR and Mn 3 O 4 /γ-MnOOH, accelerating NOR degradation with lower active energy. Quenching experiment showed that ∙O 2 − and h + played dominant roles in NOR degradation. Attractively, this study shed new lights on an innovative strategy of magnetic field assisted photocatalysis for refractory contaminants remediation from water.
研究领域:
环境科学
·
材料科学
·
光催化技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）