DALTON TRANSACTIONS
·
2015
·Vol. 44
·期 47
·20562-20567
·
IF 4.197
Su-Yun Zhang,Wen-Bin Guo,Ming Yang,Ying-Ying Tang,Mei-Yan Cui,Nan-Nan Wang,Zhang-Zhen He
Cu5(VO4)2(OH)4 (turanite) is a layered compound, exhibiting a copper(II) oxide layer in the [0 1 1] plane composed of edge-sharing CuO6 octahedra. Each Cu–O layer is further separated by VO4 tetrahedra. Closer scrutiny found that the copper(II) oxide layer in the compound represents a totally new geometrically-frustrated lattice, a 1/6 depleted triangular lattice. More specifically, the spin network in the [0 1 1] plane is formed by the alternate ranking of triangular and honeycomb strips. Magnetic measurements show that the Cu5(VO4)2(OH)4 behaves as a spin-1/2 ferrimagnet with a Tc = ∼4.5 K. It exhibits an unusual 1/5 magnetization plateau arising from the competition between antiferromagnetic and ferromagnetic interactions caused by the strong frustration. The possible spin-arrangements are also suggested.
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JOURNAL OF CATALYSIS
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2024
·
IF 6.5
Ke Liu,Lixiang Shi,Yaxin Guo,Shiduo Hao,Yunpu Zhai,Yonggang Liu
Cu-based Fenton-like systems have demonstrated high effectiveness in the degradation of organic pollutants, however, challenges still exist to overcome the sluggish cycling of metal ions and fast activation of reactants. Herein, a novel n-p type Cu 2 (OH) 3 F/Cu 2 O photo-Fenton-like catalyst (CFC) was prepared with in-situ reduction of Cu 2 (OH) 3 F and applied for tetracycline hydrochloride degradation. Under optimized condition, the target catalyst (CFC-5) showed excellent activity, achieving a degradation efficiency of approximately 99.93 % in 30 min. The reaction rate constant with CFC-5 was 4.10 and 3.26 times higher than that of Cu 2 (OH) 3 F and Cu 2 O, respectively. Moreover, the Cu 2 (OH) 3 F/Cu 2 O catalyst exhibited highly cycling stability and broad applicability. The results illustrate that construction of Cu 2 (OH) 3 F/Cu 2 O composites facilitates the charge separation and enhances Cu 2+ /Cu + cycling, which benefits the generation of highly oxidizing active species and thus significantly improved the degradation efficiency. Besides, this study offers a versatile method to construct inexpensive and efficient photo-Fenton-like heterojunction catalysts.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Xiang Dong,Guo-wei Dai,Le Xie,De-long Li,Zhiyu Sun,Song Liu
Fire alarm systems are essential for protecting lives and properties from fire hazards. However, most of the existing fire alarm nanopapers rely on the resistance reduction after heating, which requires direct contact with the flame. In this study, we present a novel fire alarm nanopaper (CMPA) based on heat-triggered shape recovery. The CMPA is composed of hydroxypropyl methyl cellulose (HPMC) as the matrix and 2D nanomaterials M(OH)(OCH 3 ) as fillers. When the temperature of CMPA exceeded the glass transition, the thrice-folded CMPA-1.0 flattened in 30s and connected to the alarm circuit based on its conductive surface. According to the results, the CMPA-1.0 with a thickness of about 0.2 mm had an efficient electromagnetic shielding of 42.1 dB. Moreover, the CMPA-1.0 self-extinguished rapidly after being ignited with its original shape preserved. The peak heat release rate of CMPA-1.0 was 108.9 W/g, which was 61.9 % lower than that of HPMC. Furthermore, the thermal conductivity of CMPA-1.0 reached to 0.317 W m −1 K −1 , which was 40.8 % higher than that of HPMC, reducing the heat accumulation effectively. This work shows that CMPA is an ideal material for sensitive and safe early fire alarm, and the strategy based on heat-triggered shape recovery is promising in fire alarm application.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Wenqi Liu,Jingyan Zhang,Mei Dong,Zhaoyi Ding,Qunfei Wang,Fanghao Ning,Qin He,Yanyan Chen,Zhen Zhao,Zhongfu Li,Conghua Liu
Low-silica chabazite (CHA) catalysts with varying configurations of Cu 2+ -2Z and [Cu(OH)] + -Z active centers are developed through the regulation of the opening of CHA-cages. The catalysts are subsequently applied to the selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) reactions. A series of characterizations and performance evaluations indicate that the density of [Cu(OH)] + -Z in eight-member rings (8MRs) is positively correlated with low-temperature performance. Moreover, the presence of partial Cu 2+ -2Z in six-member rings (6MRs) enhances activity and tolerance at high temperatures. The residual K + ions in the CHA-cages after NH 4 + exchange are retained in the 6MRs. Density functional theory calculations demonstrate that the residual K + ions stabilize the 6MRs structure, ensuring the entry and stable presence of the active Cu 2+ -2Z centers. In situ analysis reveals the reaction intermediates involved in the NH 3 -SCR process on representative catalysts. These findings can further elucidate the active centers of CHA-type catalysts and guide the design of commercial catalysts.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yang Xiang,Linjian Yu,Kun Xiong,Haidong Zhang,Jia Chen,Xueqing Shi,Min Deng,Shiqian She
Using urea oxidation reaction (UOR) instead of oxygen evolution reaction (OER) is one of promising strategies for significantly diminish power consumption for hydrogen production from electrochemical water splitting. The electrocatalysts with cost-effective, multifunctional and high-performance are urgently required for enhancing UOR and hydrogen evolution reaction (HER), but this remains a challenge. Herein, we designed a bifunctional Ni(OH) x /p-Ni catalyst by electrochemical oxidation of Ni(OH) 2 in-situ grown on the surface of porous Ni membrane (p-Ni) to generate more abundant high-valence Ni 3+ active species, which is favorable for reducing the energy barrier of electrochemical reaction . At the same time, a large number of metallic oxygen bonds (Ni–O) were formed to optimize the reaction kinetics of the electrochemical process, thus promoting the overall urea electrolysis efficiency. In 1.0 M KOH with 0.3 M urea, the optimized Ni(OH) x /p-Ni only requires potentials of 1.38 V and 0.22 V to obtain a current density of 100 mA cm −2 for UOR and HER, respectively. Notably, by assembling the Ni(OH) x /p-Ni as the cathode and anode for hydrogen production from urea-assisted water splitting, it can drive a current density of 100 mA cm −2 at a low voltage of 1.52 V and has excellent stability. This work provides a feasible strategy for design efficiently non-noble metal electrocatalysts for energy-saving hydrogen production and purifying urea-rich wastewater.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Yongfeng Chen,Rui Gao,Yufeng Sun,Geoffrey I.N. Waterhouse,Xuguang Qiao,Zhixiang Xu
Herein, a novel molecularly imprinted gel (MIG)-based electrochemical sensor equipped with hydrated zirconium oxide@hollow carbon spheres (ZrO(OH) 2 @HCS) was developed for highly sensitive and selective detection of tert-butylhydroquinone (TBHQ) in foods. The MIG was synthesized by using L-histidine to rapidly cross-link cationic guar gum, acrylamide and TBHQ through intermolecular hydrogen bonds and electrostatic interactions at room temperature, which offered outstanding specific recognition performance for TBHQ. ZrO(OH) 2 @HCS possessing excellent conductivity and water dispersibility was employed for signal amplification. Under optimal conditions, the MIG-ZrO(OH) 2 @HCS/GCE sensor showed a wide dynamic detection range (0.025–100 μM) with a low limit of detection (6.7 nM). TBHQ recovery experiments were conducted in spiked peanut oil and milk powder, yielding excellent recoveries. Moreover, the sensor was successfully utilized to detect TBHQ levels in snowflake chicken cutlets, crispy fried pork and boneless chicken fillets, and the results were in agreement with those obtained by the high performance liquid chromatography method.
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Nanoscale
·
2024
·Vol. 16
·期 16
·8162-8176
·
IF 5.8
Xinmeng Zhang,Mingyue Bai,Lei Ge,Yuanyuan Yao
The slow redox rate of hydrogen peroxide (H2O2) in neutral environments makes the H2O2 sensor inadequate for the detection of low levels of signalling molecules. The aim of this study is to fabricate a flexible sensing electrode by hydrothermally loading micro-nanometer Ni and Co(OH)2 on carbon cloth (CC) and electrochemically depositing poly(3,4-ethylenedioxythiophene) (PEDOT) on the surface of the electrode. The sensor presented high sensitivity (10.43 mA mM−1 cm−2), a wide detection range (0.033–120.848 mM), a low detection limit (0.92 nM), high stability, and excellent anti-interference performance in neutral solutions. Ni–Co(OH)2 provides abundant active sites while CC solves their agglomeration phenomenon and conductivity. The PEDOT film offers heightened conductivity, hydrophilicity, interfacial stability, and an electrochemically active surface area (ECSA). The side area of the chrysanthemum petal like PEDOT is 39 ± 7 times the bottom area, and PEDOT increases the ECSA of the composite to six times that of CC. Electrochemical precise control of PEDOT morphology to improve sensor performance provides a new strategy for the application of PEDOT in sensors.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Hui-Min Zhao,Wei-Peng Jia,Rui Dang,Xiang-Rong Ma,Yang Ma,Shuang-Yu Li,Xin Han,Nai-Cai Xu,Yu-Hong Kang,Yong Gao,Hua-Rui Hao,Rui Bai,Zhi-Fang Zhang,Cui-Ying Lu
s The development of a new type of photocatalyst for multiple deep degradation of phenol in wastewater together with the elucidation of the method for this process are highly significant in the treatment of sewage. In this report, three-dimensional heterostructured La(OH)CO 3 /NiAl-LDHs composite catalysts were prepared by loading ultrathin NiAl-LDHs onto La(OH)CO 3 substrates using a hydrothermal synthesis method and an in-situ growth technique. Photocatalytic experimental studies showed that La(OH)CO 3 /NiAl-LDHs could remove up to 97 % of (degrade) phenol from water, which was 5.86 and nearly two-fold greater than pure NiAl-LDHs and La(OH)CO 3 . Even after 5 cycles, La(OH)CO 3 /NiAl-LDHs still sustains an excellent photocatalytic stability (93.6 % phenol degradation). Fabrication of ultrathin NiAl-LDHs greatly enhanced the surface expanse of the composites from 1.442 m 2 /g to 140.16 m 2 /g, exposing more active sites. According to the in-situ XPS analysis under irradiation and the capture of active species on La(OH)CO 3 /NiAl-LDHs, the electrons would be transferred from La(OH)CO 3 to ultrathin NiAl-LDHs. The S-type heterointerfaces formed at the La(OH)CO 3 substrate with ultrathin NiAl-LDHs nanosheets effectively inhibited carrier complexation and improved the catalytic performance. Meanwhile, the formation of oxygen vacancies between La(OH)CO 3 and NiAl-LDHs further enhanced the photocatalytic activity. The photocatalytic degradation mechanism of phenol showed that the main radicals of this catalytic reaction were •O 2 - and •OH. The three-dimensional stratified staging engaged with La(OH)CO 3 and the ultrathin NiAl-LDHs mixed nanosheet faces offered a new path to advance superlative catalysts to treat sewage.
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Toxics
·
2024
·Vol. 12
·期 1
·83
·
IF 3.9
Kunyu Zhang,Yunyi Yin,Man Lv,Xin Zhang,Meichen Zhang,Jia Cui,Ziqiao Guan,Xiaona Liu,Yang Liu,Yanhui Gao,Yanmei Yang
Limited studies have demonstrated that inorganic arsenic exposure is positively associated with serum vitamin D levels, although the correlation between urinary arsenic species and serum vitamin D has not been investigated in areas of water-borne arsenicosis. A cross-sectional study of 762 participants was conducted in Wenshui Country, Shanxi Province, a water-borne arsenicosis area. The results showed a positive relationship between urinary arsenic species (inorganic arsenic (iAs), methylarsonic acid (MMAV), dimethylarsinic acid (DMAV) and serum 25(OH)D. Log-binomial regression analysis indicated a 0.4% increase in the risk of vitamin D excess for every 1-unit increment in the Box–Cox transformed urinary DMAVafter adjustment for covariates. After stratifying populations by inorganic arsenic methylation metabolic capacity, serum 25(OH)D levels in the populations with iAs% above the median and primary methylation index (PMI) below the median increased by 0.064 ng/mL (95% CI: 0.032 to 0.096) for every one-unit increase in the Box–Cox transformed total arsenic (tAs) levels. Serum 25(OH)D levels increased by 0.592 ng/mL (95% CI: 0.041 to 1.143) for every one-unit rise in the Box–Cox transformed iAs levels in people with skin hyperkeratosis. Overall, our findings support a positive relationship between urinary arsenic species and serum 25(OH)D. It was recommended that those residing in regions with water-borne arsenicosis should take moderate vitamin D supplements to avoid vitamin D poisoning.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yang Liu,Hailong Feng,Weiyi Li,Xueping Wang,Guoxiang Huang,Longxia Wang,Xingqiu Li,Yuxing Xie,Chenglu Liang
Catalysts in-situ reconstructed from transition metal sulfides for oxygen evolution reaction (OER) have been regarded as potential alternatives for the noble metal catalysts . Intriguingly, it was found that the self-optimized SO 4 2− @Cu doped Co(OH) 2 catalyst was reconstructed from bimetallic sulfide of CuCo 2 S 4 . During the OER process, the copper was partially leached and meantime doped into the in-situ generated Co(OH) 2 with SO 4 2− adsorption, while only oxides were discovered in counterparts of mono-metal sulfides. As a result, the SO 4 2− @Cu doped Co(OH) 2 catalyst exhibited superior OER performances, with low overpotentials of 211/272 mV to achieve the current densities of 10/100 mA cm −2 , exceeding the counterparts reconstructed from mono-metal sulfides. Experimental and theoretical results suggested that the in situ generated Cu doped Co(OH) 2 possessed thin and loosely layered structure with expanded lattice spacing (lattice spacing expanded from 0.28 nm to 0.46 nm) due to the SO 4 2− adsorption, making the intermediates more accessible to the active centers. In addition, the catalyst surface changed from hydrophobicity to super hydrophilicity , which greatly accelerated the mass transfer. This work indicated that the in-situ reconstruction process was greatly influenced by the interactions between metal sites and sulfide species, directly influencing the OER performances of the reconstructed catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Ligang Ma,Yihuan Ding,Chao Lin,Tingting Chen,Xinlan Li,Shun Yan,Xiang Song,Xiaoqian Ai,Xiaoshan Wu
Photocatalytic water splitting represents a sustainable pathway for hydrogen production, yet the development of efficient and cost-effective photocatalysts remains challenging. Herein, we report the in situ construction of a noble-metal-free coaxial core-shell 1D/3D heterojunction composed of paraotwayite-type α -Ni(OH) 2 nanowire (NIOH) and ZnIn 2 S 4 (ZIS) for significantly enhanced photocatalytic hydrogen evolution. The unique 1D/3D architecture of NIOH@ZIS synergistically combines the advantages of both components: the 1D NIOH nanowires suppress charge recombination by shortening in-plane migration distances, while the 3D ZIS nanoflowers provide abundant active sites and prevent structural aggregation. Under full-spectrum irradiation, the optimized NIOH@ZIS-3 heterojunction achieves an exceptional hydrogen production rate of 7.682 mmol·g⁻¹ ·h⁻¹ , 7.8 times higher than pristine ZIS. Mechanistic studies reveal that the pn heterojunction charge transfer pathway, driven by the built-in electric field at the NIOH/ZIS interface, facilitates efficient separation and utilization of photogenerated carriers. Furthermore, the heterojunction exhibits robust stability over four photocatalytic cycles without performance degradation. This work provides a rational design strategy for high-performance, low-cost photocatalysts through structural and interfacial engineering.
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Journal of Chemistry
·
2021
·Vol. 2021
·期 1
·5556295
·
IF 2.506
Zongqiang Zhu,Hongqu Yang,Jie Liu,Yinian Zhu,Shen Tang,Lihao Zhang,Xingxing Wang
Basic ferric sulfate-arsenates [FeSAsOH, Fe(SO 4 ) x (AsO 4 ) y (OH) z ·nH 2 O] were prepared and characterized to study their potential fixation of arsenic in the oxidizing and acidic environment through a dissolution for 330d. The synthetic solids were well-shaped monoclinic prismatic crystals. For the dissolution of the sample FeSAsOH–1 [Fe(SO 4 ) 0.27 (AsO 4 ) 0.73 (OH) 0.27 ·0.26H 2 O] at 25–45°C and initial pH 2, all constituents preferred to be dissolved in the order of AsO 4 3− > SO 4 2− > Fe 3+ in 1–3 h, in the order of SO 4 2− > AsO 4 3− > Fe 3+ from 1–3 h to 12–24 h, and finally in the order of SO 4 2− > Fe 3+ > AsO 4 3− . The released iron, sulfate, and arsenate existed dominantly as Fe 3+ /Fe(OH) 2+ /FeSO 4 + , HSO 4 − /SO 4 2− /FeSO 4 + , and H 3 AsO 4 0 /H 2 AsO 4 − , respectively. The higher initial pHs (6 and 10) could obviously inhibit the release of Fe 3+ from solid into solution, and the solid components were released in the order of SO 4 2− > AsO 4 3− > Fe 3+ . The crystal tops were first dissolved, and the crystal surfaces were gradually smoothed/rounded until all edges and corners disappeared. The dissociations were restricted by the Fe-O(H) breakdown in the FeO 6 octahedra and obstructed by the OH − and AsO 4 tetrahedra outliers; the lowest concentration of the dissolved arsenic was 0.045 mg/L. Based on the dissolution experiment at 25°C and pH 2, the solubility products ( K sp ) for the basic ferric sulfate-arsenate [Fe(SO 4 ) 0.27 (AsO 4 ) 0.73 (OH) 0.27 ·0.26H 2 O], which are equal to the ion activity products (logˍIAP) at equilibrium, were calculated to be -23.04 ± 0.01 with the resulting Gibbs free energies of formation (Δ G f o ) of −914.06 ± 0.03 kJ/mol.
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