SURFACE REVIEW AND LETTERS
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2019
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IF 0.748
XIANGRUI MENG,MEIFENG HAO,YIWEI JIANG,XIANGZHENYUE SUN,YAN WANG,YUQING MIAO
A simple wet-explosion method was employed to synthesize the Ni–Bi–P composite microspheres. The hollow structure was obtained possibly due to the violent evolution of gas bubbles when the reaction reagents were mixed. The hollow microspheres of Ni–Bi–P exhibited outstanding high catalytic activity for the reduction of p -nitrophenol ( p -NP) to form p -aminophenol in the presence of NaBH 4 within only 1 s. Due to the space limitation, the hollow structure of Ni–Bi–P microspheres helps to accommodate and confine the molecules of NaBH 4 and p -NP within the small space where NaBH 4 and p -NP contact closely at Ni–Bi–P catalysts. The synergetic action of Ni, Bi and P elements also contributes the enhanced catalytic activity.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Shuhuai Xia,Yujun Jiang,Xia Guo,Yaqiong Wang,Wenlin Xu
Calixarene is a third-generation supra-molecular compound and has broad application prospects in clinical disease diagnosis and intervention treatment. Calixarene/surfactant systems have received increasing attention recently because the properties of these systems can be customized. However, very little is currently known about the binding of calixarene and calixarene/surfactant systems to proteins and the effects of calixarene and calixarene/surfactant systems on protein activity. In this study, we studied the binding of sulfonatocalix[n]arene (SC[n], n = 4, 6 and 8) with bromelain (BM) and polyphenol oxidase (PPO) both in the absence and presence of sulfobetaine surfactant (N-dodecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (SDDAB)) using various techniques, including protein activity measurements, molecular simulation, and fluorescence, UV–Vis, 1 H NMR, and circular dichroism spectroscopies. We found that SC[n] entered the docking pocket of the proteins in a stoichiometric molar ratio of 1:1, whereas the proteins did not enter the cavity of SC[n]. In addition, SC[n] formed a stronger bond with BM than with PPO. SC[n] decreased the activities of the proteins, where the activity of BM was inhibited to a greater extent than that of PPO. SC[n] and SDDAB formed complexes. The proteins did not destroy the binding between SC[n] and SDDAB but bonded with the SC[n]/SDDAB complex instead by interacting with SDDAB. Moreover, the protein activities could be controlled by the molar ratio of SC[n] to the surfactant: a lower ratio corresponded to higher activity.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Peng Zuo,Yefeng Liu,Xiaolei Liu,Weizhou Jiao,Ruixin Wang
Based on the ever-growing interest of heteroatoms (e.g., P, N, S, transition metals) doping into molybdenum carbide and graphene for electrochemical reactions , herein, a ternary phosphomolybdic acid-polyethyleneimine/graphene oxide nanocomposite as a suitable precursor was developed to not only uniformly hybridize molybdenum and carbon source to perform the controllable in situ growth of well-defined molybdenum carbide nanostructure on graphene by annealing, but also synchronously dope N and P atoms into molybdenum carbide crystal lattice and graphene. The as-prepared hybrid showed remarkable electrocatalytic activity and high stability for hydrogen evolution reaction in basic media, due to the following favorable features, i.e. a large accessible active sites afforded by the ultrafine molybdenum carbide, the heteroatoms doped, the regulated electronic structure, the balanced thermodynamics between hydrogen adsorption and desorption , the accelerated charge/mass transfer ability by the ultrathin and defective carbon layer , and the protection of molybdenum carbide by carbon layer. As a result, it only needed a small overpotential of 47 mV to drive 10 mA cm −2 and a low onset potential of 10 mV, as well as a small Tafel slope of 56.8 mV·dec −1 , thus suggesting its promising potential for hydrogen evolution electrocatalyst .
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Shan Ni,Hongnan Qu,Zihao Xu,Xiangyang Zhu,Huifang Xing,Li Wang,Jiemiao Yu,Huizhou Liu,Congmei Chen,Liangrong Yang
Heterogeneous electrocatalysis usually involves the charge transfer between the surface of electrocatalysts and corresponding reactants. Thus, modulating the surface electron density of electrocatalysts is an effective strategy to boost the electrocatalytic activity of targeted reactions. Herein, the NiSe 2 /FeSe 2 p-p heterojunction is constructed via a simple selenization method for both oxygen evolution reaction (OER) and urea oxidation reaction (UOR). The designed NiSe 2 /FeSe 2 electrocatalyst exhibits a superior activity towards OER, which only requires a low overpotential of 256 mV to reach a current density of 10 mA cm −2 , and surpasses other selenides and even the state-of-the-art RuO 2 . Impressively, when employed as the UOR electrode, the NiSe 2 /FeSe 2 heterojunction needs only 127 mV overpotential at 50 mA cm -2 , remarkably superior to other selenides and confirming the less energy consumption for UOR. The comprehensive analysis demonstrates that the well-designed built-in electric field at the heterointerface of NiSe 2 /FeSe 2 p-p heterojunction due to the difference of energy levels can expedite the charge transfer and thus strengthen the conductivity of heterojunction electrocatalyst. Moreover, the self-driven electron transfer across the NiSe 2 /FeSe 2 heterointerface can induce local charge redistribution at the interface region, which is beneficial for the adsorption of OH − and urea owing to the electrostatic interaction. Therefore, the designed NiSe 2 /FeSe 2 p-p heterojunction with regulated electronic structure displays extraordinary electrocatalytic activity for both the OER and UOR. This study demonstrates a novel strategy to manipulate the surface/interface charge states of electrocatalysts for improving the catalytic activity of OER and UOR, and provides new guidelines for exploring other superior electrocatalysts.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
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IF 2.694
Xu Jie,Chen Mengqi,Wei Yan,Hao Shuanghong
In this article, we propose a method of recovering p-MePhSO3K from the industrial by-product of quizalofop-p-ethyl. The phase diagram of the solid–liquid equilibrium system of p-MePhSO3K2CO3–H2O at the temperatures of 15, 25, 35, 45, and 55 °C was determined and plotted. Based on the phase diagram of 25 °C, the separation and recovery process of p-MePhSO3K from the p-MePhSO3K2CO3–H2O system was designed by analyzing the crystallization fields. First, p-MePhSO3K and K2CO3 were crystallized from wastewater in turn through evaporation separation. Then, the crystallized p-MePhSO3K was purified further by washing with ethanol. Finally, the pure p-MePhSO3K was transformed into the intermediate p-toluenesulfonyl chloride and then the intermediate l-p-toluenesulfonate ethyl lactate for quizalofop-p-ethyl production.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2011
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IF 3.068
Wenhui Xiong,Jian Peng,Yongfeng Hu
This paper presents a novel technique integrating bulk-sensitive and surface-sensitive XANES methods to distinguish between physisorption and chemisorption for phosphate adsorption onto ferrihydrite-modified diatomite (FHMD). XANES P K-edge, L-edge, and Fe M-edge spectra were obtained for reference samples (K 2 HPO 4 and FePO 4 ·2H 2 O) and test samples (phosphate adsorbed onto FHMD (FHMD-Ps) and Si-containing ferrihydrite (FHYD-Ps)). A resolvable pre-edge peak in the P K-edge spectra of FHMD-Ps and FHYD-Ps provided direct evidence for the formation of P–O–Fe(III) coordination and the occurrence of chemisorption. The resemblance between the P L-edge spectra of K 2 HPO 4 and FHMD-Ps and the marked difference between the spectra of FHMD-Ps and FePO 4 ·2H 2 O indicated the intact existence of the adsorbate and the adsorbent. The similarity between Fe M-edge spectra of FHMD and FHMD-Ps and the difference between the spectra of FHMD-Ps and FePO 4 ·2H 2 O confirmed the findings from P L-edge analyses. Therefore, chemisorption and physisorption coexisted during phosphate adsorption onto FHMD. Phosphate chemisorption occurred in the deeper zone of FHMD (from 50 nm to 5 μm); whereas physisorption occurred in the zone of FHMD shallower than 50 nm since the probing depth of XANES P K-edge method is 5 μm and that of P L-edge and Fe M-edge methods is 50 nm.
研究领域:
环境化学
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材料科学
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表面科学
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吸附
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光谱学
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SCIENCE OF THE TOTAL ENVIRONMENT
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2023
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IF 9.8
Long Chen,Li-Ting Zhou,Yang-Cheng Ding,Di Wu,Hua-Jun Feng
As an important raw material for the synthesis of chemical and pharmaceutical, hazardous carcinogen p-chloronitrobenzene ( p -CNB) has been widely found in high-salinity wastewater which need to be treated carefully. Due to the high-salinity shock on microorganisms , conventional microbial treatment technologies usually show poor effluent quality. This study initially investigated the p -CNB removal performance of microorganisms stimulated by 1.2 V low-voltage in high-salinity wastewater under facultative anaerobic conditions and further revealed the enhanced mechanisms. The results showed that the p -CNB removal kinetic parameter k p-CNB in the electrostimulating microorganism reactor (EMR) increased by 104.37 % to 155.30 % compared to the microorganism reactor (MR) as the control group under the varying salinities (0–45 g/L NaCl). The secretion of extracellular polymeric substances (EPS) in halotolerant microorganisms mainly enhanced by 1.2 V voltage stimulation ranging from 0 g/L NaCl to 30 g/L NaCl. Protein concentration ratio of EMR to MR in loosely bound EPS achieved maximum value of 1.77 at the salinity of 15 g/L NaCl, and the same ratio in tightly bound EPS also peaked at 1.39 under the salinity of 30 g/L NaCl. At the salinity of 45 g/L NaCl, 1.2 V voltage stimulation mainly enhanced salt-in strategy of halotolerant microorganisms, and the intracellular Na + and K + concentration ratio of EMR to MR reached maximum and minimum values of 0.65 and 1.92, respectively. Furthermore, the results of microbial metagenomic and metatranscriptomic analysis showed the halotolerant microorganisms Pseudomonas_A and Nitratireductor with p -CNB removal ability were enriched significantly under 1.2 V voltage stimulation. And the gene expression of p -CNB removal, salt-in strategy and betaine transporter were enhanced under voltage stimulation at varying salinities. Our investigation provided a new solution which combined with 1.2 V voltage stimulation and halotolerant microorganisms for the treatment of high-salinity wastewater.
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PubMed
高影响因子
ENVIRONMENT INTERNATIONAL
·
2019
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IF 7.943
Jing Zhan,Yiran Liang,Donghui Liu,Xiaoran Ma,Peize Li,Wangjing Zhai,Zhiqiang Zhou,Peng Wang
Background The prevalence of obesity has raised global concerns. Environmental pollutants are one of the main causes of obesity. Many studies have demonstrated that dietary fiber could reduce obesity induced by high-fat diets, but whether environmental pollutant-induced obesity can be reversed is still unknown. Objectives This study aimed to investigate the effects of pectin on obesity induced by a typical environmental pollutant p,p'-dichlorodiphenyldichloroethylene (p,p′-DDE) and explore the underlying mechanism by which pectin reversed p,p′-DDE-induced obesity. Methods p,p′-DDE was used to induce obesity in C57BL/6J mice and pectin was supplied during and after cessation of p,p'-DDE exposure. Body and fat weight gain, plasma lipid profile and insulin resistance of mice were assessed. Gut microbiota composition and the levels of short-chain fatty acids (SCFAs) as well as the receptor proteins and hormones in the SCFAs-related signaling pathway were analyzed. Moreover, p,p′-DDE levels in various tissues of mice were detected. Results Pectin supplementation reversed body and fat weight gain, dyslipidemia, hyperglycemia and insulin resistance in p,p′-DDE-exposed mice. Furthermore, pectin apparently altered the p,p′-DDE-induced microbial composition and then promoted the levels of SCFAs in colonic feces as well as the expression of G-protein coupled receptors and the concentration of hormone peptide YY (PYY) and glucagon like peptide-1 (GLP-1). Pectin treatment also significantly reduced p,p′-DDE accumulation in mice tissues during p,p′-DDE exposure but did not change p,p′-DDE metabolism after termination of p,p′-DDE exposure. Conclusions Pectin had a good effect on reducing p,p′-DDE-induced obesity through regulating gut microbiota and provided a potential strategy for the treatment of environmental pollutant-caused health problems.
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
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IF 6.14
Jiajia Feng,Dingke Zhang,Hongpeng Zhou,Mingyu Pi,Xiaodeng Wang,Shijian Chen
Fabricating heterostructures to promote the charge separation and doping heteroatom to modulate the band gap of the photocatalysts have been regarded as effective strategies to improve the photocatalytic performance. However, it is still an unresolved issue of doping element and fabricating heterostructures with good contact at the same time. In this study, P nanostructures/P doped graphitic carbon nitride composites (P@P-g-C3N4) were successfully composited by a solid reaction route. Various structural characterizations, including X-ray adsorption near edge structure, indicate that P has been doped into g-C3N4 and P nanostructures were directly grown on g-C3N4 to form heterostructures. As expected, the intimate contacted heterostructured composites exhibit much enhanced light absorption and high-efficiency transfer and separation of photogenerated electron–hole pairs, and consequently, the composites also possess the superior photocatalytic performance in the rapidly degrading RhB and an efficient H2 production rate of 941.80 μmolh–1g–1. Systematical studies combining experimental measurements with theoretical calculations were carried out to expound the underlying reasons behind the distinct performance. This study pave a one-step way to synthesize earth abundant element C, N, and P as novel photocatalysts for photochemical applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Zizheng Ai,Yongliang Shao,Bin Chang,Lei Zhang,Jianxing Shen,Yongzhong Wu,Baibiao Huang,Xiaopeng Hao
As a metal-free polymeric semiconductor, graphitic carbon nitride (g-C 3 N 4 ) is a promising candidate for photocatalytic water splitting but suffers from the insufficient optical absorption and sluggish utilization of photocarriers. Herein, based on the energy band engineering theory, a new design philosophy of tunable p-n homojunction is proposed and realized in a novel P-doped g-C 3 N 4 (PCN) material. Through regulating the tendency of transformation in p-n homojunction, a strong internal electric field is built and integrated with two secondary internal electric fields by further decorating with Ti 3 C 2 , leading to the formation of a triple-internal electric field system. Thus the spatial separation efficiency of photocarriers is improved and their lifetime is prolonged. The specific photocatalyst exhibits excellent overall water splitting performance in pure water with a notable quantum yield. This work presents a peculiar concept of adjustable p-n homojunction and holds great significance for the rational design of advanced photocatalyst in water splitting.
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JOURNAL OF CATALYSIS
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2022
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IF 8.047
Xiaowen Sun,Qing-Nan Wang,Shengyang Wang,Pengfei Zhang,Zhendong Feng,Xianwen Zhang,Zhaochi Feng,Can Li
Photocatalytic selective oxidation of p -xylene with O 2 offers a mild pathway to synthesize p -methyl benzaldehyde ( p -MBA), which is one of the primary precursors in the manufacture of fine chemicals. Here, we report that Au/WO x /TiO 2 photocatalyst selectively catalyzes the oxidation of p -xylene to p -MBA with 88.6% selectivity at 1.0% conversion, the formation of CO x is suppressed to 0.8%. Kinetic experiments indicate that p -methylbenzyl alcohol and p -MBA are initial products. p -Methylbenzyl alcohol is further oxidized to form p -MBA, p -methylbenzyl acid and CO x ; p -MBA is further oxidized to p -methylbenzyl acid and CO x . On TiO 2 surface, p -methylbenzyl alcohol is more prone to directly combust to CO x by O 2 – . Loading of WO x can weaken the adsorption ability of p -methylbenzyl alcohol on the catalyst surface to avoid the combustion. Meanwhile, WO x and Au can facilitate the separation of photo-generated carriers to attain high activity and suppress the O 2 – formation to obtain high selectivity.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 4
·1-9
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IF 2.8
Zhen Cheng,Ma Limin,Liu Shuang,Wang Yishu,Li Dan,Guo Fu
Electroplating crystalline cobalt–phosphorus (Co–P, with 1 ~ 8 at.% P) is a potential interfacial layer for electronic packaging solder joints, however, the optimal content of P has been lack of systematic research. In this work, crystalline Co–P coatings with P contents of 2, 4 and 6 at.% (Co–2P, Co–4P, Co–6P) were prepared and then bonded with Sn–Ag solder to form Cu/Co– x P/Sn–Ag solder joints. Within aging at 180 °C for 120 h, the diffusion resistance and intermetallic ductility of crystalline Co–P coatings with different P contents were systematically studied. The microstructure, phase composition and mechanical properties of Co–Sn intermetallic compounds (IMCs) were comprehensively characterized using XRD, SEM, EBSD and nano-indentation techniques. The XRD results showed that the Co–P coatings were crystalline structure, with obvious sharp diffraction peaks of β-Co. The Co–4P system exhibited the slowest IMCs growth rate and the best diffusion resistance was obtained in this system, and the kinetic analysis showed that the Co–Sn IMCs growth at the interface was controlled by interface reaction and volume diffusion. It was found that CoSn 3 was generated in the three systems during the aging process, while CoSn 4 and Co–Sn–P were generated only in Co–6P system. Compared with Ni–Sn, Co–Sn exhibited significantly lower IMCs hardness, so the brittle fracture tendency of Co–P solder joints was lower. With the increase of P content, the hardness of Co–Sn IMCs increased first and then decreased, ranging from 3.20 to 4.94 GPa, and the minimum value was noticed in the Co–6P system. Co–4P coating would be a promising barrier layer owing to its good diffusion resistance, Co–6P coating may be used in solder joints with high mechanical load owing to its lowest IMCs hardness, and the Co–2P coating can maintain a balance in anti-diffusion and mechanical properties.
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