Analytical Methods
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2021
·Vol. 13
·期 25
·2857-2864
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IF 2.896
Lan Wang,Huan Zhang,Hang Shi,Baodan Jin,Xiaoyun Qin,Geng Wang,Kucong Li,Tingting Zhang,Hongzhong Zhang
In this study, we develop a highly sensitive and selective photoelectrochemical (PEC) sensor for bisphenol A (BPA) determination by combining a TiO2/CdS heterostructure with inorganic framework molecular imprinting (MI) technology. A MI-TiO2/CdS heterostructure was synthesized via successive ionic layer adsorption combined with an inorganic framework molecular imprinting method. Due to the matched energy level distribution of TiO2 with CdS, the formed heterojunction promotes photogenerated charge separation and enhanced PEC conversion. The MI-TiO2/CdS based PEC sensor exhibits higher photocurrent responses and perfect selectivity for BPA under simulated sunlight irradiation. Benefiting from the unique heterostructure and special recognition ability of MI-TiO2/CdS, the photocurrent is linear to the concentration of BPA (range from 1 to 100 pmol L−1), with a low limit detection of 0.5 pmol L−1 (S/N = 3). Meanwhile, the detection results show that the PEC sensor exhibits excellent sensitivity, high selectivity, and good stability. Furthermore, the PEC sensor was successfully applied to the real environmental sample detection of BPA, in lake and river water, domestic wastewater and tap water. This PEC sensor exhibits favourable BPA detection, and it is also a promising method by which to measure other similar environmental substances selectively and sensitively in future work.
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Environmental Science-Nano
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2021
·Vol. 8
·期 7
·2069-2080
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IF 8.131
Xuan He,Lei Zhang,Xiangang Hu,Qixing Zhou
Solar steam generation has attracted interest in water purification and seawater desalination as an efficient solar energy conversion method. However, the complex preparation process and limited efficiency restrict the practical applications of solar-generated steam. Here, we report a three-dimensional wood membrane inside coated with MoS2 (WM-H, with S defects) for efficient seawater desalination. The vertically aligned mesoporous wood channels and their inner microstructures increase the contact interface between water and MoS2 in wood. The formation of S defects allows the surface temperature of the membrane to reach ∼53 °C under 1 sun illumination. The MoS2-coated wood with S defects exhibited an excellent evaporation flux (1.46 kg m−2 h−1, one sun), with a solar thermal conversion efficiency of 82.5%. The adsorption peak values of Na+ on the two sides of MoS2 with defects are 2.17 times and 1.49 times higher than those of MoS2 without defects. The wood-based design provides an inexpensive way to capture solar energy and generate steam.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 25
·14451-14458
·
IF 12.732
Yonggang Liu,Haijing Li,Junfu Li,Xiaoshuang Ma,Zhiming Cui,Daqiang Gao,Zhenghua Tang
Two-dimensional (2D) rhenium disulfide (ReS2) has been attracting immense interest as a highly promising hydrogen evolution reaction (HER) electrocatalyst recently. However, the HER catalytic active sites of ReS2 are still limited to the finite edges of the nanosheets and the basal-plane is catalytically inert. How to activate the in-plane catalytic activity of ReS2 accordingly becomes the sticking point to further boost its H2 evolution efficiency. Here, the fluorinated ReS2 hierarchical structure assembled as ultrathin nanosheets is proved to exhibit excellent HER activity, where the optimal sample of ReS2-F5.93 shows a low overpotential of 142 mV vs. RHE at a current density of 10 mA cm−2, a Tafel slope of 64 mV dec−1, and significantly improved stability. The enhanced HER performance is mainly attributed to the synergistic effects of increased in-plane active sites and remarkably accelerated charge transfer kinetics. The density functional theory calculation results reveal that F doping can yield the optimal H* adsorption Gibbs free energy and meanwhile increase the electronic states near the Fermi level for accelerated electron transfer. This work can broaden the horizon for designing efficient HER electrocatalysts via activating the in-plane catalytic activity of transition metal dichalcogenides (TMDs).
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Ahmad Beyhaqi,Seyed Mohammad Taghi Azimi,Zhihong Chen,Chun Hu,Qingyi Zeng
Exfoliated and plicated g-C 3 N 4 nanosheets (CNsF) were prepared through a thermal-chemical exfoliation in which the bulk g-C 3 N 4 was obtained first under thermal exfoliation, and then was exposed to an acidic etching using hydrofluoric acid under hydrothermal condition. The acidic etching not only exfoliated g-C 3 N 4 nanosheets by disrupting weak van der Waals forces between layers, which led to formation of a monolayer or a few layers of g-C 3 N 4 nanosheets, but also made disordered defects on its surface and created plicated g-C 3 N 4 nanosheets. Under visible-light illumination, the optimized sample (CNsF-6%) showed a hydrogen evolution rate of 54.13 μmol h −1 g −1 (without co-catalyst) and a specific surface area of 121.4 m 2 g −1 , which were about 4.7 and 2.5 times, respectively, higher than pristine g-C 3 N 4 . It also showed remarkably enhanced photocatalytic performance in removing various organic pollutants. This remarkable improvement probably arises from the porous nanosheets and an increased number of active sites resulting from the CNsF, which subsequently enhanced the charge separation efficiency. This work provided an alternative way to obtain highly active g-C 3 N 4 photocatalysts .
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Polymers
·
2021
·Vol. 13
·期 5
·837
·
IF 4.329
Xingang Liu,Jiang Tan,Xi Li,Chuhong Zhang
In this work, hierarchical MoS2/C quasi-hollow microspheres are prepared by a one-pot hydrothermal process with the addition of glucose. The glucose is not only inclined to form the roundish sphere in the completion of the synthesis of MoS2, but at the same time the microspheres formed by the glucose can act as the nuclei on which the MoS2grows. Glucose, acting as a nucleating agent, has the advantages of being low-cost and environmentally friendly, which can simplify the fabrication process. The interiors of the MoS2/C samples are multi-hole and quasi-hollow, which is beneficial for the insertion and extraction of lithium ions. For the first time, we demonstrate that hierarchical-structured MoS2/C quasi-hollow microspheres exhibit an excellent cycling stability and rate capability in lithium ion batteries (LIBs) and are significantly superior to the bulk MoS2. The method presented in this article may provide a simple, clean. and economical strategy for the preparation of MoS2/C microspheres as a feasible and promising anode material for LIBs.Keywords:MoS2;hydrothermal synthesis;hollow microsphere;lithium ion battery (LIB)
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Reaction Kinetics Mechanisms and Catalysis
·
2021
·Vol. 132
·期 2
·1211-1224
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IF 2.081
Zhang Long,Ge Jianhua,Zhuang Tao,Ding Xiulong,Zheng Xuyang
A series of novel sodium persulfate (Na 2 S 2 O 8 ) modified g-C 3 N 4 photocatalysts were prepared in this study to enhance nitrogen fixation. Characterization results found that the type of precursors and the mass ratio affect the crystal structure, morphology, and optical properties of the modified g-C 3 N 4 . The photocatalysts exhibited considerable nitrogen vacancies (N Vs ) depending on the nature of the different precursors and their mass ratios to Na 2 S 2 O 8 . In addition, the production rate of ammonia of the modified g-C 3 N 4 was significantly higher than that of pure g-C 3 N 4 under optimal conditions. The four cycles show modified g-C 3 N 4 excellent stability. Combined with the results of pH test, the possible mechanism of the photocatalytic nitrogen fixation process using modified g-C 3 N 4 was proposed.
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Functional Materials Letters
·
2021
·
IF 2.17
Biao Wang,Ya Liu,Xu Huai,Yuqing Miao
In order to develop non-noble metal-based electrocatalysts for glucose oxidation, the Ni-doped, urchin-like Bi 2 S 3 particles were prepared by a solvothermal method using the solvent of ethylene glycol/H 2 O. The obtained products were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction. The background signal from capacitance current is relatively low and the electrocatalytic oxidation current of glucose relatively high due to the urchin-like nanostructure of Bi 2 S 3 particles and high surface area where the presence of Bi also improves the electrocatalytic performance of Ni I I /Ni I I I shift.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Ming Qu,Jirui Hou,Tuo Liang,Pengpeng Qi
Much attention has been directed toward amphiphilic nanosheets in diverse applications owing to their remarkable properties. In this work, the rhamnolipid-molybdenum disulfide nanosheets, environmentally friendly biological-amphiphilic-nanosheets (BANs), are prepared through the one-step simple hydrothermal method. The ultralow concentration of BANs (0.005 wt %), as a solid emulsifier, can emulsify crude oil and stabilize the size of emulsions (oil in water) within 1.2 μm. The adsorption of BANs to the oil–water interface improves the stability of the BANs emulsion, and it both reduces interfacial tension and increases interfacial film strength. Tremendous desorption energy (thousands of KBT) is required to remove a single BAN from the interface to the bulk phase. Besides, BANs can turn an oil-wet surface into an intermediate-wet surface and spread to exfoliate oil film on the solid surface. The evolution of the three-phase contact line experiences two stages: a steep stage and a gentle stage. The spreading behaviors are due to an imbalance between the surface forces and structuring disjoining pressure at the confinement region (wedge film). Moreover, 25.3% of additional oil recovery was observed from the flooding of an ultralow concentration of BANs nanofluid (0.005 wt %) in a natural outcrop core, which is 2.5 mD in permeability at experimental conditions: 120 °C and around 25 × 104 mg/L in salinity. The high tolerance of rhamnolipid-molybdenum disulfide nanosheets to high temperature and harsh salinity is because of synergism between MoS2 nanosheets and rhamnolipid molecules. Additional residual oil reduction is due to a combination of multiple effects such as crude oil emulsification, wettability alteration, interfacial tension reduction, and formation of structuring disjoining pressure. This study presents the possibility to enhance oil recovery in low-permeability reservoirs with harsh conditions.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Liangmei Rao,Peicong Zhou,Peng Liu,Xinyu Lu,Xuemin Duan,Yangping Wen,Yifu Zhu,Jingkun Xu
Green and sustainable development provides a new idea for solving environmental pollution issues of rural biomass wastes. Amorphous molybdenum sulfide (a-MoS x ) nanocomposite based on biochar microsphere (BM) as voltametric sensing platform for smart analysis of baicalin in real sample was facilely prepared. Pomelo peel was employed as the carbon source for improving electronic conductivity and environmental stability and electrocatalytic capacity of a-MoS x . A mixture consisted of the precursor of both a-MoS x and BM were treated by a co-hydrothermal method. The a-MoS x nanocomposite with porous BM was formed by centrifuging, washing, drying, pulverizing, and calcining. The structure and properties of the as-obtained nanocomposite were characterized, and the electrochemical behaviors of baicalin, parametric conditions and performance of the as-prepared sensor were investigated. Peak currents recorded by differential pulse voltammetry is proportional to baicalin concentrations in wide linear ranges from 10 nM to 5 μM with a low limit of detection of 2 nM. Machine learning algorithms like least squares support vector machine and artificial neural network was built to realize smart analysis and digital output for baicalin. Good cyclic stability, excellent voltammetric response, and satisfactory practicability will provide a promising electrochemical sensing platform for facile preparation of two-dimension nanomaterials functionalized with biochar derived from agroforestry biomass.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhenzong Zhang,Yuxin Cao,Fenghao Zhang,Wenjie Li,Yuanling Li,Han Yu,Meiyang Wang,Hongbing Yu
A novel S-scheme photocatalytic heterojunction composite nanomaterial is developed by integrating zero-dimensional WO 3 quantum dots (WQDs) on two-dimensional ultrathin CdIn 2 S 4 (CIS) nanosheets with the aim of fostering carrier separation, enhancing the performance of carrier interface transport, minimizing carrier distance transport, and achieving effective photocatalytic CO 2 reduction. The composite photocatalyst WQDs/CdIn 2 S 4 (WCIS) allows for the efficient photocatalytic reduction of CO 2 to CO and CH 4 , as shown by product analysis and isotopic measurement. The photogenerated electrons in WQDs recombine with the holes in CIS nanosheets, and the left electrons in CIS have stronger CO 2 reduction abilities. The highest yields of CO and CH 4 achieved with the WCIS photocatalyst are 8.2 and 1.6 μmol g -1 h −1 ––2.6 and 8 times higher than those for CIS, respectively. Moreover, the S-scheme WCIS possesses a stable crystal structure and recycling ability. Finally, the S-scheme charge transfer path on the WCIS composite is proposed according to theoretical calculation, in-situ irradiated X-ray photoelectron spectroscopy, and electron paramagnetic resonance (ESR) analyses.
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CHEMOSPHERE
·
2021
·
IF 7.086
Hui Li,Nana Wang,Tangfu Xiao,Xiangting Zhang,Jianqiao Wang,Jinfeng Tang,Qingnan Kong,Chuanbin Fu,Huabang Quan
Arsenic (As) is a problematic pollutant that can cause cancer and other chronic diseases due to its potential toxicity. Iron (oxyhydr)oxides can readily sorb As and play important roles in the geochemical cycle of As. Attention has mainly been given to the affinity and mechanism of As sorption by synthetic pure iron (oxyhydr)oxides, and little is known about the relationship between As behavior and multicomponent secondary iron minerals (SIMs) naturally formed in acid mine drainage (AMD). To investigate this relationship, we performed sorption kinetics, isotherm and competitive sorption experiments to investigate As(V) sorption behaviors on naturally formed SIMs harvested from different runoff zones of an abandoned coal mine. Several spectroscopic analyses were used to evaluate the structural and component changes and phase transformation. Three environmental SIMs formed at nascent (n-SIM), transient ( t -SIM) and mature ( m -SIM) stages were determined to be similar in the element components of Fe, S and O but different in structure. As(V) sorption behaviors on these environmental SIMs followed a pseudo-second-order kinetic model, and the sorption extent followed the sequence of n-SIM > t -SIM > m -SIM. As(V) sorption is not significantly influenced by Na + /Ca 2+ concentration or ionic strength except for that of PO 4 3− , and it slightly decreases as the Cr(Ⅲ) concentration increases but increases with increasing Sb(Ⅲ)/(V) concentration. The results of spectral analyses indicate that As(V) immobilization mainly depends on exchange with SO 4 2− and surface complexation, along with the phase transformation of schwertmannite/jarosite to goethite and other phases. These findings are helpful for better understanding the geochemical behaviors of As(V) associated with environmental SIMs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Lili Lu,Yongjin Ma,Hongqin Liu,Rui Dong,Pengfei Tan,Lu Yang,Jun Pan
Developing durable and efficient photocatalysts for H 2 evolution is highly desirable to expedite current research on solar-chemical energy conversion. In this work, a novel photocatalytic H 2 evolution system based on Zn 0.3 Cd 0.7 S/NiS 1.97 nanocomposite was rationally designed for the first time. In this advanced composite structure, NiS 1.97 nanosheets as a co-catalyst were intimately coupled to the inner surface of the hollow spherical Zn 0.3 Cd 0.7 S. The construction of the hollow spherical shell shortened the distance of charge migration to the surface site and increased the multiple absorption of incident light. The introduction of NiS 1.97 nanosheets increased the light absorption capacity of the composite system and also greatly improved the separation and migration behavior of photo-generated carriers due to its narrower band gap and relatively low conduction band position, which had been confirmed by DRS, EIS and PL. As a result, the hollow Zn 0.3 Cd 0.7 S/NiS 1.97 composite material exhibited excellent photocatalytic activity. At the loading amount of NiS 1.97 up to 15 at.%, the hollow Zn 0.3 Cd 0.7 S/NiS 1.97 composite exhibited the best photocatalytic activity with a corresponding H 2 production rate of 22.637 mmol g -1 h −1 , which was 1.42 times and 1.85 times that of hollow Zn 0.3 Cd 0.7 S and solid Zn 0.3 Cd 0.7 S, respectively. Moreover, this novel catalyst also displayed a long-term stability without apparent debasement in H 2 evolution activity. It is expected that this work could provide new inspiration to the design and development of other highly active photocatalytic systems for water splitting.
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