SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Zhongjuan Wang,Yunhe Li,Guohua Shen,Yuanqing Li,Xinyi Zhang,Jianfeng Gou,Xiuwen Cheng
In recent decades, persulfate activation technology has been used to degrade persistent organic pollutant. Moreover, both transition metal-based catalyst and metal-free catalyst have become more efficient activator. In this study, Cu-Fe LDH was synthesized and calcined at different temperature to form into metal oxides (CLDH). Then, the CMK/LDH and CMK/CLDH composites were fabricated by co-precipitation and sonic treatment, respectively. Furthermore, the prepared samples were used to activate PS for sulfamethoxazole degradation. Based on the several characterizations and degradation experiments, a comparative study of different catalysts was conducted and the results reached the following factors: i CMK/LDH owned the best capacity of PS activation on sulfamethoxazole decomposition, 84.9% SMX of 25 mg/L was degraded with less dosage of persulfate (0.5 g/L) and catalyst (0.15 g/L) being added. ii CMK/CLDH owned the better adaptability of initial pH value compared with CMK/LDH. Meanwhile, based on scavenger quenching experiment and chronoamperometric, it was speculated that non-radical pathway played more role in CMK/LDH composite/PS/SMX system compare with radical pathway. It was interesting to find that SO 4 • − were mainly generated by LDH while HO• were mainly produced by CMK part. However, the non-radical pathway for SMX decomposition was only ascribed to the electron bridge effect that the CMK owned. This study might provide a theoretical support for further studies on comparison about LDH and the metal oxides originating from calcination of LDH for PS activation.
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Nanoscale
·
2020
·Vol. 12
·期 46
·23799-23808
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IF 6.895
Xiaoxiao Wang,Jing Li,Yuanyuan Liu,Meiri Wang,Hongtao Cui
As a typical electrode material in Faraday supercapacitors (FSs), Ni(OH)2 has some intrinsic issues such as low electrical conductivity and structural instability, resulting in its low performance. In view of these issues, we design a multifunctional nanostructure, rigid nanosheet-interlaced structure of Ni–Co LDH/graphene to improve the electrical conductivity and structural stability of Ni(OH)2. Under the high shear applied by a high shear mixer (HSM) and the regulation of polyvinylpyrrolidone (PVP), the designed structure is realized. Benefitting from the well-designed structure and improved electrical conductivity of the graphene sheet-high homogenization, Ni–Co LDH/graphene presents the expected performance. It exhibits a high specific capacity of 1020 C g−1 at a low current density of 2.7 A g−1 and excellent high rate performance (637.5 C g−1 at 62.5 A g−1). The asymmetrical supercapacitors (ASCs) assembled with the composite as the positive material show high energy density (86.5 W h kg−1 at a power density of 695.7 W kg−1). Due to the improved structural stability, the ASCs also exhibit high cycling stability (a capacity retention of 97.8% after 10 000 charge–discharge cycles).
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Haihua Xu,Sidi Zhu,Mingzhu Xia,Fengyun Wang
The efficient removal of Diclofenac sodium (DCF), a nonsteroidal anti-inflammatory drug, has attracted more and more attention. In this work, ternary core-shell CS@PANI@LDH composite was synthesized via the in-situ growth of Mg/Al layered double hydroxide plates onto polyaniline-wrapped carbon sphere and applied for DCF removal. Various influence factors like concentration, pH, time, temperature, and background electrolytes were systematically investigated. The maximum adsorption capacity was 618.16 mg/g. Besides, after 5 regeneration cycles, CS@PANI@LDH still retained high adsorption capacity. The adsorption mechanism was investigated by Fourier transformed infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) characterization analyses. Simultaneously, the Multiwfn program combined the Chimera program was applied to calculate and visualize the localized orbit locator (LOL) of π electrons in DCF − molecule, which explored the π electronic structure and conjugation characteristics of DCF − molecule. Moreover, the Independent Gradient Model (IGM) analysis based on pro-molecular density revealed the interaction sites and interaction strength between DCF and LDH. The adsorption mechanism could be explained through electrostatic interaction and hydrogen bonding between LDH and DCF, π-π interaction between DCF and PANI. It was the synergistic effects of different interactions that improved the adsorption of DCF by CS@PANI@LDH composite.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Summaira Saghir,Enfa Fu,Zhenggang Xiao
With industrialization, wastewater treatment technologies have drawn huge attention and among different approaches the adsorption process is very attractive because of its simple design and low operational cost. In this paper, CoCu-layered double hydroxide (LDH) was prepared having huge surface area with a large pore diameter, which is significant for obtaining excellent adsorption properties for methyl orange (MO). After detailed adsorption kinetics analysis, the results followed pseudo second order (PSO) kinetic model having good correlation coefficient (R 2 ) values. However, adsorption isotherms data matched well with the Freundlich isotherm kinetics model. Furthermore, CoCu-LDH exhibits significant adsorption capacity even in the fifth cycle of MO adsorption, indicating that the CoCu-LDH is competitive and cost-effective adsorbent for anionic dyes from industrial wastewater.
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Catalysts
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2018
·Vol. 8
·期 8
·296
·
IF 3.465
Shuqi Fang,Kang Bi,Qiao Zhang,Lingpeng Chen,Yongming Sun,Hongyu Huang,Longlong Ma,Chenguang Wang
Layered double hydroxide (LDH) is a layered solid containing positively charged layers with negatively charged anions as an interchangeable interlayer. In this research, Mg(Al)O supports were synthesized with three different Mg:Al molar ratios, and bimetallic PtSn catalysts were loaded onto the supports via the anion exchange method. The properties of ethane dehydrogenation of the PtSn/Mg(Al)O catalysts were investigated. The results show that the structure and properties of the PtSn/Mg(Al)O catalysts were influenced by the Mg:Al molar ratio of the hydrotalcites, which consequently influenced the ethane dehydrogenation performance. When the Mg:Al ratio was 5:1, the ethane dehydrogenation performance was optimal, relative to the Mg:Al ratios of 2:1 and 10:1.Keywords:hydrotalcite;Mg:Al molar ratio;anion exchange method;ethane dehydrogenation
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Guanglan Di,Zhiliang Zhu,Qinghui Huang,Hua Zhang,Jianyao Zhu,Yanling Qiu,Daqiang Yin,Jianfu Zhao
Pharmaceuticals have been frequently detected in various water bodies, posing potential threat to human health and ecological environment. In this work, ZnFe-LDH derived mixed metal oxides (ZnO/ZnFe 2 O 4 , ZnFeMMO) were innovatively adopted to modulate the g-C 3 N 4 photocatalytic performance for the enhanced degradation of ibuprofen (IBF) and sulfadiazine (SDZ) as targeted pollutants. Characterization analyses indicated that the g-C 3 N 4 /ZnFeMMO composites were in the feature of rationally-designed microarchitecture, increased specific surface area, improved light absorbance and efficient charge separation, thereby resulting in promoted photocatalytic activities. Furthermore, the ratio of g-C 3 N 4 to ZnFeMMO in the composites was found to exert significant effects on the resulted microstructures and properties. The results showed that the composite with low g-C 3 N 4 content of 1.0 wt% or high g-C 3 N 4 content of 90 wt% exhibited the optimum catalytic activity for the degradation of IBF or SDZ, respectively. Such distinct structure-activities can be attributed to the different dominated reactive species in two cases: h + for IBF degradation but OH for SDZ degradation. A Z-scheme mechanism was proposed for the charge separation, together with ZnFe 2 O 4 as a light sensitizer. Degradation pathways for IBF and SDZ were established by ESI-QToF-MS technology . This work provided a new perspective to develop rationally-architectured g-C 3 N 4 based photocatalysts for the decontamination of water polluted by pharmaceuticals.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xue Bai,Fengyi Sun,Liyan Ma,Zhuwu Jiang,Hongcheng Di,Chuntao Pan,Fengying Zhang,Jiahan Yang,Hongyu Zhang
A green and sustainable three-dimensional particle electrodes system with nickel-iron layered double hydroxide mixing activated carbon particles (NiFe-LDH/AC) as particle electrodes is used in this work. Its employment in degradation of N-Nitrosodiethylamine (NDEA), A type of nitrosamines disinfection byproducts (NAs) widely present in water bodies, exhibiting significant degradation efficiency at close to neutral pH. Response surface methodology (RSM) is used to analyze the interaction effects and predict optimal conditions of four operating parameters (influent water flow, electrolyte concentration, current density and initial concentration) on the NDEA degradation efficiency. Calculated coefficients of determination (R 2 ) are higher than 0.997 for all responses according to analysis of variance. At optimum conditions, a maximum degradation efficiency of 71.88% is achieved for NDEA. The results of electron paramagnetic resonance (EPR) and free radical quenching experiments indicate that the degradation of NDEA in the 3D AER system is dominated by •OH. Furthermore, based on the recognition of main reaction intermediates by GC-MS and density functional theory (DFT), possible degradation pathway is proposed and toxicological evaluation of degradation products is made. Our research provides a promising alternative method for the efficient and environmentally friendly removal of NAs from water.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Honglin Qin,Lizhen Qiao,Chen Li,Xiuchao Yao,Bingyan Han
In this work, a novel composite Fe 3 O 4 /NiAl LDH/MIL-125 (Ti) was developed through modifying the Ti-based MOF into magnetic NiAl LDH materials and applied to efficiently extract organophosphorus flame retardants (OPFRs) from water samples. The prepared Fe 3 O 4 /NiAl LDH presented good extraction efficiency for OPFRs, and, electrostatic interaction and π-π interaction also played an important role for the extraction process, except for the selective metal-affinity coordination between the adsorbents and OPFRs. Some key factors influencing the magnetic solid-phase extraction efficiency were explored, including adsorbent amount, ultrasound time, solution pH, salt content, the type of elution solvent and eluent volume. Under the optimal conditions, the coefficients of determination (R 2 ) of the OPFRs were 0.9976–0.9996, and the limits of detection (S/N = 3) and limits of quantification (S/N = 10) were respectively 0.3–1.0 μg·L −1 and 1.0–3.0 μg·L −1 . The developed approach was applied for the extraction and determination of OPFRs in the environmental water samples, and the spiked recoveries ranged from 82.79 % to 111.32 %.
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Sustainable Materials and Technologies
·
2024
·
IF 8.6
Lei Guo,Yan-He Chen,Li-Mei Xu,Xiao-Lu Chen,Jin-Qiu Shen,Jian-Yong Zhang,Zhen-Jiang Liu
Herein, a fern-like p-n heterojunction by anchoring Ni 3 Fe-LDH nanoplates onto Co 3 O 4 nanoneedles have been optionally constructed. Essentially, p-n heterojunction ensured to induce strong built-in electric field, and inherit interfacial electron redistribution. Based on their compatible and well-matched electronic band structures, a staggered type-II photo-generated electron/holes transfer pathway have been elaborated by density functional theory calculation (DFT), in situ irradiation X-ray photoelectron spectroscopy (XPS), and fluorescent decay. This band bending and charge migrating module conferred the architecture with strong redox ability, sufficient exciton dissociation, and admirable optoelectronic characteristics. Moreover, the heterostructure acquired broad absorption spectrum to exhibit outperforming photocatalytic effect. Totally, this electron redistribution at the hierarchical interface, a type-II scheme charge-transfer pathway and the oxygen defects would lead to high efficiency in solar light assisted N 2 reduction. Typically, Co@Ni 3 Fe-2 catalyst exhibited the highest NH 3 production rate of 16.15 μg h −1 mg cat. −1 and Faraday efficiency (FE) of 31.57% at −0.6 V vs. RHE in 0.1 M Na 2 SO 4 solution. Fortunately, with light exposure, the NH 3 production rate and FE could increase by 27.9% and 18.1% than that under dark. This work would provide a plausible attitude towards the design of high efficient photocatalyst for artificial photosynthesis with multi-functionalized coupling effect.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Zhuo Zeng,Xiaoming Li,Qi Yang,Dongbo Wang,Abing Duan,Shuaijun Pan,Jiangfu Zheng
In advanced oxidation processes (AOPs) based on peroxynitrite (PMS), generating reactive radicals efficiently and consistently is challenging due to high electron occupancy and slow conversion rates of PMS. In this study, ultrathin In 2 O 3 with oxygen vacancies (Ov) was combined with ultrathin ZnAl-LDH to construct S-scheme In 2 O 3 -Ov/ZnAl-LDH-Ov heterojunctions. The presence of Ov promotes the formation of charge-transfer channels (Al-O-In bonding) at the interface of these heterojunctions, thereby reducing electron occupancy and enhancing the generation of active radicals in the InLDH/PMS/Vis system. This S-scheme heterojunction facilitates the acceleration of photogenerated electrons, leading to the rapid conversion of PMS into hydroxyl (•OH) and sulfate radicals (SO 4 - •), and promotes swift electron transfer. Consequently, the InLDH/PMS/Vis system demonstrates exceptional degradation efficiency for a wide range of organic pollutants and a high removal capacity in treating real industrial wastewater. This investigation offers a novel perspective on the coordination mechanisms between photocatalysis and PMS activation.
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CELLULOSE
·
2024
·Vol. 31
·期 6
·3517-3531
·
IF 4.9
Zhang Shanbei,Chen Zanmei,He Hongwei,Jiang Yijun
The alkali/urea system is an economical and environmentally friendly solvent system for dissolving cellulose. However, the mechanical performance of cellulose derived materials (such as fibres or films) treated with alkali/urea must be improved. The capacity of this system for cellulose dissolution is limited and the mechanical properties of the regenerated cellulose fibres are still unsatisfactory. Here, cotton linter pretreated with peracetic acid (PAA) was dissolved in a LiOH/urea aqueous suspension in which Zn–Al layered double hydroxide (Zn–Al LDH) nanosheets (NS thickness = 3 nm) were exfoliated in situ. After wet spinning, the strength and toughness of the regenerated cellulose fibres reached 290 ± 7.66 MPa and 23.5 ± 4.40 MJ/m 3 respectively, which were 66.7% and 150% higher than those without the LDH NS treatment. It is interesting to note that the synergistic effect of Zn 2+ and Al 3+ distributed on the surface of the LDH host layer significantly improved the solubility of cellulose at low temperature and the interaction between the cellulose and LDH NSs also improved the mechanical performance. This work provides a strategy for improving both the solubility of cellulose in the alkali/urea system and the mechanical properties of regenerated cellulose fibres. Graphical abstract
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SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Wenyi Qiu,Xinglong Ye,Yan Liu,Bin Lin,Junfeng Chen,Lei Xiao,Chen Wang,Bingshu Wang,Xiping Cui,Linchi Zou
In order to achieve in-situ growth of layered double hydroxides (LDH) film on plasma electrolytic oxidation (PEO) coating of AZ31B magnesium alloy under mild conditions, a facile method was used in this work, that is ethylenediaminetetraacetic acid (EDTA)-assisted growth method. Compared to the conventional hydrothermal method, the fabrication of LDH/PEO composite coating by this method does not require a high temperature and high pressure environment and is not constrained by the size of the reactor. Furthermore, the obtained LDH/PEO composite coating exhibits enhanced corrosion protection, which will be widely applied in corrosion protection field of surface engineering. In this work, an effective strategy to control the dissolution of PEO coating and the growth of LDH film by regulating the concentration of EDTA was proposed, after revealing the growth behavior of LDH on PEO coating during this facile fabrication process. The growth behavior of LDH film can be briefly summarized in three stages: PEO coating dissolution, LDH nucleation, and LDH growth. Interestingly, the growth mechanism of LDH was changed with EDTA assistance. LDH shifted from preferential growth within the micropores of the PEO coating to uniform growth. With the assistance of 0.06 M EDTA, which is optimal, the dissolution of original PEO coating provided a stable and sufficient Mg source for the growth of LDH film, resulting in a dense LDH network structure on the PEO coating. This uniformly grown LDH film could not only seal the inherent defects of the PEO coating but also exhibited the ability to adsorb corrosive anions, which increases the tortuosity and difficulty in penetration of corrosive media, significantly improving the corrosion resistance of the LDH/PEO composite coating.
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