Analytical Methods
·
2023
·Vol. 15
·期 35
·4582-4590
·
IF 3.1
Xiurui Ke,Jinran Chen,Lin Chang,Zhou Zhou,Wei Zhang
p-Nitrophenol (PNP) is widely used in pesticides, pharmaceuticals, and dyestuffs. It is vital to detect trace PNP in the environment, because it poses significant environmental hazards due to its high toxicity. In this paper, a new method was reported for preparing a SERS substrate with excellent SERS activity by combining self-assembly techniques and flexible materials. First, the three-dimensional (3D) polystyrene (PS) photonic crystal (PC) structural master was fabricated by stacking two layers of self-assembled PS nanospheres with different diameters. Polydimethylsiloxane (PDMS) with a complementary structure to the master was obtained by casting, curing and peeling off. Finally, the PDMS–Ag substrate was fabricated by sputtering a thin Ag layer on the PDMS structure. The enhancement factor (EF) of the PDMS–Ag substrate was calculated to be 2.90 × 109 by using 4-amino thiophenol (ATP) as the probe molecule, and the limit of detection (LOD) for ATP can reach 10−11 M. And the RSD of the SERS intensity for the peak at 1078 cm−1 on the PDMS–Ag substrates from batch to batch was within 2%, indicating the high reproducibility of the as-prepared substrate. The quantitative analysis of PNP was achieved with a LOD of 10−8 M. Therefore, the PDMS–Ag substrate exhibits high sensitivity and reproducibility, and it can detect PNP in trace amounts, with great potential for detecting other contaminants.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Nanzhu Nie,Dan Zhang,Zuochao Wang,Shijie Ge,Yanli Gu,Bo Yang,Jianping Lai,Lei Wang
Achieving acidic seawater hydrogen production under commercial current densities remains a challenge. We present here a novel strategy through strong metal-support interaction (SMSI) and Pt-p-block alloys (PtM@CNT, M = Ga, In, Pb, and Bi) to construct a stable electronic perturbation and achieve acidic seawater hydrogen evolution performance at commercial current densities for the first time. SMSI stabilizes electronic perturbation and promotes durability up to 360 h. The optimized Pt 61 Ga 39 @CNT exhibits an overpotential of 18 mV at 10 mA cm −2 in 0.5 M H 2 SO 4 and maintains 360 h stability at 500 mA cm −2 in acidic seawater. Density functional theory (DFT) calculation reveals that the optimized d -band center of Pt and ΔG H* increase the catalytic activity, and the higher vacancy formation energy enhances the durability. Overall, this discovery not only first achieves stable acidic seawater hydrogen production under commercial current densities, but also opens a new opportunity to explore catalytic applications of p-block alloys and SMSI stabilized electronic perturbation.
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JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2022
·
IF 5.062
Lixin Liu,Qi An,Yunan Zhang,Weitong Sun,Jinjing Li,Yanru Feng,Yiding Geng,Guangdong Cheng
With the purpose of improving the solubility and reducing the hygroscopicity of enrofloxacin (ENR), an unreported pharmaceutical salt cocrystal of enrofloxacin with both neutral and anionic p-nitrobenzoic acid (PNB) (ENR-PNB, C 19 H 23 FN 3 O 3 ·C 7 H 4 NO 4 ·C 7 H 5 NO 4 ) was designed and synthesized by changing the reaction molar ratio (1:2) of ENR and coformer PNB on the basis of summarizing the past experience of our group, and its crystal structure was characterized. Single-crystal X-ray diffraction (SCXRD) analysis revealed that the salt cocrystal consists of ENR + , PNB − and PNB neutral molecule in a 1:1:1 ratio. The two asymmetric units that become centrosymmetric form an X-shaped structure centered on the ENR dimer R 2 2 (20). The adjacent X-shaped structures are interconnected by hydrogen bonds to form 1D chain and form the octamer R 8 8 (42) at the same time. As we expected, the formation of the salt cocrystal ENR-PNB results in a simultaneous improvement in the solubility and hygroscopicity of ENR. This may be the fact that ENR and PNB depend on CAHBs to raise the hydrous enthalpy of salt cocrystal. And the presence of PNB neutral molecules lower hygroscopicity of ENR in high humidity environments. Unexpectedly, the permeability of ENR-PNB was also increased compared to that of pure ENR. It is speculated that the number of polar sites in the system is greatly reduced because of hydrogen bonds formation, which increases the permeability of the ENR salt cocrystal. In addition, the in vitro antibacterial activities of ENR-PNB are enhanced at different concentrations compared to ENR. The present study implies that it is possible to improve the solubility, hygroscopic stability, permeability and antibacterial activity of enrofloxacin by changing the chemical reaction molar ratio to form salt cocrystal containing both neutral and anionic coformers, which provides a new strategy and insight to simultaneously improve the solubility and hygroscopicity and even permeability of the active ingredients of solid drugs.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yanqing Cong,Yanan Li,Xiaoran Wang,Xing Wei,Lin Che,Shi-Wen Lv
In this study, a double p-n heterojunction based on g-C 3 N 4 @NiO/Ni@MIL-101 ternary composite was successfully prepared by a feasible method. Results suggested that the rational growth of NiO and MIL-101 on the surface of g-C 3 N 4 can improve the absorption capacity for visible light. Importantly, the formation of double p-n heterojunction can effectively inhibit the recombination of photogenerated electrons and holes. Due to the significant Fermi level differences among NiO, MIL-101 and g-C 3 N 4 , the internal electric fields were established on the interface after constructing the composite, consequently reducing the electrical resistance and accelerating the transfer of photoinduced charge carriers. As expected, the g-C 3 N 4 @NiO/Ni@MIL-101 ternary composite with good stability had excellent photocatalytic performance in the degradation of emerging pollutants, and the removal efficiency of ibuprofen was as high as 95.6%. The •O 2 − , •OH and 1 O 2 were the major active species in the reaction system. Furthermore, developed photocatalytic oxidation system can also achieve the rapid inactivation of bacteria. Based on the synergistic effects of energy band position and double internal electric fields, the separation and transfer of photogenerated charge carriers followed a traditional type-II route. In short, current work not only constructed a promising photocatalyst, but also shared an effective strategy for boosting the photocatalytic activity.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Tao Zhang,Liwei Zhuang,Dan Li,Lingzong Meng,Tianlong Deng,Yafei Guo,Yong Ma
The solubilities of salts, refractive indices, and pH values of the equilibrium liquid phases in the quaternary system LiCl–LiBO2–Li2B4O7–H2O at 323.15 K were investigated by the isothermal dissolution method for the first time. The dry-salt diagram of the quaternary system consisted of one invariant point, three univariant curves and three crystallization fields corresponding to LiCl·H2O, LiBO2·2H2O, and Li2B4O7·3H2O. The solution refractive indices and pH values change regularly with the changing of concentration. Combining the equilibrium constants for different boron species, the distributions of six boron species in the mixed solution in the systems LiCl–LiBO2–H2O, LiBO2–Li2B4O7–H2O, and LiCl–Li2B4O7–LiBO2–H2O were calculated with the total boron concentration and pH values. The main boron species in the mixed solution of the quaternary system are B3O3(OH)4–, B4O5(OH)42–, B(OH)3, and B5O6(OH)4–. The boron species distributions are mainly affected by the pH values and the concentration of total boron and LiCl in the solution. The results of phase diagram and boron species distribution in the quaternary system can supply foundation data for separating lithium borate from brines.
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Advanced Sustainable Systems
·
2022
·Vol. 6
·期 5
·2100436
·
IF 6.737
Xiaolin Ren,Yuchen Tian,Firdoz Shaik,Jine Yang,Rong Liu,Kaiming Guo,Bin Jiang
Iron group metal phosphides (IMPs) are one of the most promising substitutes for non-noble electrocatalysts in overall water splitting. In this work, an electrocatalyst system consisting of different vertically aligned heteroatom-doped graphene arrays (X-rGO, X = N, P, B, O, S) integrated with FeCoNiP nanoparticles (FeCoNiP@X-rGO, X = N, P, B, O, S) is prepared for overall water splitting. The unique vertical structure and the synergistic effect between the P in P-rGO and the P in FeCoNiP leads to the excellent electrocatalytic performance of FeCoNiP@P-rGO by exhibiting low overpotentials (121 and 216 mV) at a current density of 10 mA cm −2 for hydrogen evolution reaction in 1 m KOH and 0.5 m H 2 SO 4 , respectively. As well as a low overpotential (354 mV) at a current density of 10 mA cm −2 for the oxygen evolution reaction in 1.0 m KOH. The FeCoNiP@P-rGO electrocatalyst exhibits an outstanding durability toward overall water splitting in alkaline electrolytes, and excellent Faraday efficiency (about 92%) as well. This work provides an insight in proper tuning and the development of appropriate substrates for IMPs and other transition metal compounds toward cost-effective and high efficiency electrocatalysts for water splitting reactions.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 4
·046511
·
IF 4.386
Ping Yang,Menglei Ren,Congcong Jin,Honglong Xing
NiMoO4 (NM) nanowires coated on nickel foam (NF) were prepared by the facile hydrothermal method. After calcination at low temperature, the nitrogen and phosphorus were co-doped into bimetal NF@NM nanowires. The hollow nanowire structure could be obtained after low-temperature calcination and nonmetallic doping. The as-synthesized hollow NF@NiMoO4/N/P (NF@NM-NP) nanowires exhibit excellent hydrogen evolution reaction performance (with an overpotential of −164 mV at −100 mA cm−2) due to the existence of planar defects and the hollow structure. To further improve the catalytic activity in the oxygen evolution reaction, amorphous lamellar NiFe-layered double hydroxide (NiFe LDH) was deposited onto the NF@NM-NP nanowires via an electrochemical method to form core–shell NF@NM-NP@NiFe LDH, which deliver an overpotential of 218 mV at 100 mA cm−2. Furthermore, an asymmetric setup composed of NF@NM-NP hollow nanowires and core–shell NF@NM-NP@NiFe LDH electrode were fabricated for overall seawater splitting, which can deliver potentials of 1.46 and 1.70 V at current densities of 10 and 100 mA cm−2 in simulated alkaline seawater (1 M KOH and 0.5 M NaCl), respectively. This may provide an effective path for the formation of a green energy conversion system.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Asad Ali,Pinsong Chen,Qudrat Ullah Khan,Pei Kang Shen
Developing cost-effective and remarkable electrocatalysts toward oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performs excelling role in boosting the hydrogen energy application . Herein, a novel in-situ one-pot strategy is developed for the first time to synthesize molybdenum carbide nanoparticles (Mo 2 C NPs) incorporated on nitrogen (N) and phosphorous (P) co-doped stereotaxically carbon (SC). The optimized Mo 2 C NPs/N, P–SC–800 electrocatalyst exhibits lower overpotentials of 131 and 287 mV for HER and OER to deliver a current density of 10 mA cm −2 in 1.0 M KOH medium with smaller Tafel slopes of 58.9 and 74.4 mV/dec, respectively. In addition, an electrolyzer using Mo 2 C NPs/N, P–SC–800 electrode as cathode and anode delivers a current density of 10 mA cm −2 at a small voltage of 1.64 V for overall water splitting. The excellent water splitting performance could be ascribed to optimum Mo 2 C NPs for more accessible active sites, highly active N, P-SC networks for accelerated electron transfers , and synergetic effect between Mo 2 C NPs and N, P-SC networks. The N, P-SC network not only enhances the overall dispersion of Mo 2 C NPs but also contributes numerous electroactive edges to enhance the performance of HER, OER, and overall water splitting activity. This research work explores the in-situ one-step strategies of advanced, cost-effective, and non-precious metal electrocatalysts for efficient water splitting and motivates the consideration of a novel class of heteroatom doped stereotaxically carbon nanocomposites for sustainable energy production.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 6
·2898-2907
·
IF 3.925
Juan Qiu,Yingdi Wang,Xiang Liu
We synthesized a CuBi2O4/BiOCl p–n heterojunction photocatalyst by a convenient one-pot hydrothermal method. And the morphology, crystal phase, element composition and optical properties of as-synthesized CuBi2O4/BiOCl were analyzed utilizing SEM, EDS, TEM, XRD, XPS, UV-visible DRS, PL and EIS techniques. Under visible light, the CuBi2O4/BiOCl p–n heterojunction exhibits excellent photocatalytic activity for the degradation of tetracycline hydrochloride, and when the CuBi2O4 content in the heterojunction is 20 wt%, the photocatalytic activity of the CuBi2O4/BiOCl heterojunction is the highest, which is 58.2 times and 4.1 times that of pristine CuBi2O4 and BiOCl, respectively. The photocatalytic activity of the heterojunction increased with the enhancement of visible light absorption and the effective separation of photogenerated electron–hole pairs which is promoted by the built-in electric field. In addition, a radical trapping study showed that h+ and ˙O2− radicals were the main active species in the photocatalytic process. On this basis, the possible photocatalytic mechanism was discussed.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yun Zhong,Jianbin Tang,Xin Zhang,Xinpeng Wei,Mengyao Li,Yujia Feng,Jian Wang
Aerospace, military and precision electronic equipment urgently need efficient, lightweight and durable flexible electromagnetic interference (EMI) shielding fabrics to shield electromagnetic radiation . Inspired by mussels, the corrugated PPTA@PDA@CoNiP composite material with multi-reflection interfaces was designed on the surface of poly para-phenylene terephthalamide (PPTA) fabric through efficient self-assembly of polydopamine (PDA) and electroless deposition Co-Ni-P. The ferromagnetic Co-Ni-P formed a strong interface adhesion with the fabric, and constructed a closed magnetic conductive network (saturation magnetization of 50.8 emu/g and resistance value around 150 mΩ), which enabled electromagnetic radiation to be reflected and absorbed. Hence, PPTA@PDA@CoNiP fabric sample exhibited excellent electromagnetic interference shielding effectiveness (EMI SE, 76.9 dB), absorption loss (SE A , 58.7 dB) and reflection loss (SE R , 18.2 dB) through the synergistic effect of electrical loss and magnetic loss in X-band. PPTA@PDA@CoNiP fabric retained good electrical conductivity even after repeated bending for 1000 cycles. In addition, the fabric still had certain air permeability after deposition of Co-Ni-P, and the Co-Ni-P layer showed excellent corrosion resistance . Meanwhile, this work provided an efficient and green approach for constructing an electromagnetic shielding layer on the surface of an inert fabric.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Dongshu Sun,Tianyu Zhou,Guangbo Che,Chunbo Liu
The engineering and synthesis of g-C 3 N 4 -based photocatalysts with high utilization rate of charge carriers and extensive visible light responsive range is pivotal to alleviate the energy crisis. Herein, inosculating P-doped g-C 3 N 4 with NiS (NPCN) via the calcination-solvothermal method to establish 2D/2D Schottky-junction with interfacial P-Ni bond photocatalyst can achieve high-efficiency hydrogen production upon exposure to visible light, the 2-NPCN displays superior photocatalytic H 2 -release ability up to 299.6 μmol in the absence of cocatalysts, which is approximately 53.3 times higher than that of BCN (5.6 μmol). Not only that, the apparent quantum efficiency (AQE) of the reconstructed material is 11.7% at 420 nm. Noticeably enhanced photocatalytic HER activities accrue from the fact that P-doped g-C 3 N 4 can shorten the band gap for widening the visible light responsive range, and the synergistic effect of Schottky-junction and P-Ni chemical bond can increase the separation efficiency of electron-hole pairs and efficiently ameliorating the charge transfer dynamics. Moreover, the 2D/2D structure with large and tight contact interfaces can decrease the charge migration distance. In this work, the 2D/2D NPCN Schottky-junction photocatalyst reasonably designed provides a meaningful case for meeting the requirements for high-efficiency hydrogen production driven by solar energy.
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Environmental Science-Nano
·
2021
·Vol. 9
·期 2
·511-522
·
IF 8.131
Xiaohui Zhong,Zuqi Zhong,Shujie Liang,Gongchang Zeng,Shuang Cheng,Hong Deng,Zhang Lin
The electrochemical CO2 reduction reaction (CO2RR) to HCOOH offers a promising strategy for a carbon-neutral cycle. Sn-Based materials have been demonstrated as applicable in extensive studies of CO2RR to HCOOH, but great challenges still remain, including the weak CO2 adsorption and narrow potential window as well as low stability. Herein, we developed ultrasmall Sn nanoparticles inlaid on N/P-doped carbon (Sn@NPC) composites by an upcycling design using Sn electroplating sludge. The obtained Sn@NPC electrode exhibited a higher Faradaic efficiency of 87.93% for HCOOH at 1.05 V vs. RHE and an FE over 80% within a 500 mV broad potential window. Moreover, the Sn@NPC electrode achieved excellent long-term stability up to 105 h, which was superior to that of most Sn-based catalysts in similar systems. Density functional theory calculations demonstrated that Sn@NPC could enhance CO2 adsorption, which led to stronger *OCHO adsorption, weaker *HCOOH adsorption and faster electron/mass transport. This work may provide a promising lead for recycling metal from electroplating sludge and for the design of efficient and stable catalysts for the CO2RR.
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