JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2022
·
IF 5.141
Teng Du,Miao Cui,Yue Chao,Yuxuan Xiao,Ziqi Ren,Yonglin An,Changgong Meng
Photocatalytic application is obstructed by the self-aggregation and low specific surface area of nano materials. High dispersion of SmVO 4 nanoparticles on HMOR zeolite (HMOR) were prepared by template-free method. Not only the agglomeration of nanomaterials is restrained, but also the combination of low-cost zeolite and semiconductor to prepare high-performance photocatalyst is conducive to the rational utilization of resources. Sm(NO 3 ) 3 ·6H 2 O and NH 4 VO 3 were used as precursors, and mixed with HMOR to prepare SmVO 4 /HMOR by precipitation method.. This method does not use any templates and surfactants, realizing the high dispersion of SmVO 4 nanoparticles on the surface of HMOR with the particle size are 17 ∼ 23 nm. The photocatalytic activity of SmVO 4 /HMOR was tested by degradation of rhodamine B (RhB). Compared with the monomer of SmVO 4 , the degradation rate of 29.81 wt% SmVO 4 /HMOR was increased from 33.12 % to 70.99 % under visible light irradiation for 2.5 h. The rate constant k (0.50 h −1 ) was boosted to 2.9 times as much as SmVO 4 monomer (0.17 h −1 ). When 3.7 wt% H 2 O 2 (30 %) was added into the photocatalytic system, the photocatalytic degradation rate could reach 93.26 % within 30 min. The synergistic effect of SmVO 4 and HMOR is critical on the improvement of the removal efficiency of RhB. SmVO 4 in the form of nanoparticles on the HMOR support has high photocatalytic activity. In addition, HMOR acted as electron acceptor to accelerate the transfer efficiency of photoelectrons, inhibiting the recombination of charges and improve the photocatalytic efficiency.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Yun-fei Zhang,Chun-hui Zhang,Yu-feng Liu,Dan Li,Jian-hui Xu,Lei Li,Qi Wu,Jin-hong Fan,Lu-ming Ma
Herein, the SiC-Fe 0 powders were mechanically synthesized and employed for activation of peroxymonosulfate (PMS) to remove florfenicol (FLO). Compared to Fe 0 /PMS system, up to a 3.97-fold increase in degradation rates of 20 mg/L FLO was observed by 25% ( w / w ) SiC-Fe 0 /PMS system in 5 mins, which could be attributed to the increased specific surface area and electron transfer rate of SiC-Fe 0 . Both the radical and non-radical processes were involved in the SiC-Fe 0 /PMS system, in which 1 O 2 and • O 2 − played the dominant role in the FLO degradation and SO 4 •− as well as • OH also participated in the system. ROSs investigation suggested that 1 O 2 , • O 2 − , SO 4 •− were mainly generated from the decomposition of PMS and • OH was mainly derived from the ZVI (or Fe 2+ )-catalyzed activation of O 2 . Meanwhile, H* has a nonnegligible role in PMS activation or the transformation of iron species. Five intermediates of FLO in SiC-Fe 0 /PMS system were identified and a significant removal of the overall toxicity was observed. The degradation pathways of FLO were proposed to be hydrolysis, hydroxylation and dechlorination. Besides, this SiC-Fe 0 /PMS system shows effective removal rate for 2-chlorophenol, acetaminophen, tetrabromobisphenol A and carbamazepine, and the FLO-polluted surface water and artificial wastewater. Overall, this study demonstrated that SiC-Fe 0 was promising in practical application and provided new insights into the generation mechanisms of ROSs in the ZVI/PMS system.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Xiaoyu Xia,Xiaoyi Tan,Chao Wu,Yao Li,Guanghua Zhao,Ming Du
The aggregation-induced emission (AIE) material has been widely used in biological detection due to their unique property of fluorescing in aggregation state. However, the poor dispersion and biocompatibility limit its application in in vivo real-time imaging. Here, a novel strategy is designed to obtain pH-responsive AIE nanomaterials, working through 4-Undecoxy Tetraphenyl Ethylene Methacrylate (PM1) block, with excellent features (dispersion, biocompatibility, self-reconstruction and cancer specific recognition). The recombinant human H-ferritin (rHuHF) was used to prepare rHuHF-PM1 nanocomposites which effectively supported the dispersion and transfer of PM1 in the biological environment, even making it target tumor cells due to the overexpression of ferritin receptors on tumor cells. To simulate the changes of rHuHF in intracellular lysosomes, particle size and fluorescence of rHuHF-PM1 were analyzed, which reflected the loose structural changes of rHuHF nanocages in weak acid system that facilitated the degradation of macromolecular rHuHF in intracellular lysosomes and following release of PM1. The released PM1 molecules aggregated and emitted brilliant blue fluorescence. Several cell lines, Hela, HT-29, HepG2, L-O2 and HUVEC have all been sensitively detected and distinguished. Accordingly, this nanocage has a potential to be applied to disease diagnosis and provides a novel sensing platform for the identification of cancer.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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IF 7.963
Zhengqing Cai,Yougui Song,Xibiao Jin,Chong-Chen Wang,Haodong Ji,Wen Liu,Xianbo Sun
A highly solar active AgBr/h-MoO 3 composite was constructed by a facile precipitation method, and the charge separation tuning was achieved by photoreduction of AgBr. The photoreduced Ag 0 on AgBr/h-MoO 3 acted as charge transfer bridge to form Z-scheme heterostructure, while the high degree of Ag reduction converted the material into type-II heterostructure. The synthesized optimal material promoted charge separation and visible light activity due to the incorporation of highly solar active AgBr, which showed ca. 2 times activity on trimethoprim (TMP) degradation than h-MoO 3 . The contribution of reactive species on TMP degradation followed the order of O 2 − > 1 O 2 > h + , which agree well with the proposed charge separation mechanism. The photocatalytic degradation mechanism of TMP was proposed based on the radical quenching, intermediate analysis and DFT calculation. The toxicity analysis based on QSAR calculation showed that part of the degradation intermediates are more toxic than TMP, thus sufficient mineralization are required to eliminate the potential risks of treated water. Moreover, the material showed high stability and activity after four reusing cycles, and it is applicable to treat contaminants in various water matrix. This work is expected to provide new insight into the charge separation tuning mechanism for the AgX based heterojunction , and rational design of highly efficient photocatalysts for organic contaminants degradation by solar irradiation.
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Materials
·
2021
·Vol. 14
·期 11
·2741
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IF 3.623
Pengcheng Lv,Ruihong Meng,Zhongyang Mao,Min Deng
In this study, the hydrated sodium aluminosilicate material was synthesized by one-step hydrothermal alkaline desilication using fly ash (FA) as raw material. The synthesized materials were characterized by XRD, XRF, FT-IR and SEM. The characterization results showed that the alkali-soluble desilication successfully had synthesized the sodium aluminosilicate crystalline (N-A-S-H) phase of sodalite-type (SOD), and the modified material had good ionic affinity and adsorption capacity. In order to figure out the suitability of SOD as an adsorbent for the removal of ammonium and phosphorus from wastewater, the effects of material dosing, contact time, ambient pH and initial solute concentration on the simultaneous removal of ammonium and phosphorus are investigated by intermittent adsorption tests. Under the optimal adsorption conditions, the removal rate of ammonium was 73.3%, the removal rate of phosphate was 85.8% and the unit adsorption capacity reached 9.15 mg/L and 2.14 mg/L, respectively. Adsorption kinetic studies showed that the adsorption of ammonium and phosphorus by SOD was consistent with a quasi-secondary kinetic model. The adsorption isotherm analysis showed that the equilibrium data were in good agreement with the Langmuir and Freundlich model. According to thermodynamic calculations, the adsorption of ammonium and phosphorus was found to be a heat-absorbing and spontaneous process. Therefore, the preparation of SOD by modified FA has good adsorption properties as adsorbent and has excellent potential for application in the removal of contaminants from wastewater.Keywords:N-A-S-H;sodalite;simultaneous removal;ammonium;phosphorus
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Materials
·
2020
·Vol. 13
·期 10
·2340
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IF 3.057
Yongzhe Fan,Huazhen Yang,Haisheng Fan,Qi Liu,Chuang Lv,Xue Zhao,Mingxu Yang,Jianjun Wu,Xiaoming Cao
The hexagonal boron nitride (h-BN) nanosheets modified by silane coupling agent (KH560) were doped into acrylic acid coating on the surface of galvanized steel to improve its corrosion resistance. H-BN nanosheets modified by KH560 were prepared and characterised by scanning electron microscopy, transmission electron microscopy, atomic force microscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy. The corrosion resistance of the acrylic acid coatings was measured by electrochemical testing. The results show that the corrosion current density of the coating with modified h-BN nanosheets was reduced from 2.2 × 10−5A/cm2to 2.3 × 10−7A/cm2compared with the acrylic acid coating. The impedance of the composite coating with modified h-BN is 4435 Ω·cm2, higher than the BNNS coating (2500 Ω·cm2) and the acrylic acid coating (1500 Ω·cm2). This is due to the physical barrier and electrical insulation properties of the hexagonal boron nitride (h-BN) nanosheets.Keywords:hot-dip galvanized steel;boron nitride nanosheet;corrosion resistance;acrylic coating
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Journal of Central South University
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2020
·Vol. 26
·期 11
·2974-2986
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IF 1.249
Xu Si-quan,Pan Dong-hui,Xiao Guo-min
With the aim of achieving a high 5-hydroxymethylfurfural (HMF) yield from glucose with H-ZSM-5 catalyst at low cost, three inexpensive biphasic reaction systems, H 2 O—tetrahydrofuran (THF), H 2 O—2-methyltetrahydrofuran (MeTHF) and H 2 O’2-butanol, were discovered and proved to be particularly effective in promoting the formation of HMF from glucose over H-ZSM-5 zeolite. In order to determine the optimal process conditions, the effects of various experimental variables, such as reaction temperature, reaction time, catalyst dosage, volume of organic solvent, as well as inorganic salt type on glucose conversion to HMF in three systems were investigated in detail. It was found that under optimal reaction conditions, H 2 O—THF, H 2 O—2-butanol and H 2 O—MeTHF allowed the glucose dehydration process to achieve HMF yields of up to 61%, 59%, and 50%, respectively. Moreover, in the three biphasic systems, the H-ZSM-5 catalyst was also demonstrated to maintain excellent stability. Thus, the catalytic approach proposed in this paper can be believed to have potential prospects for industrially efficient and low-cost production of HMF.
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Biosensors-Basel
·
2023
·Vol. 13
·期 10
·932
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IF 5.4
Gang Peng,Mengxue Guo,Yuting Liu,Han Yang,Zuorui Wen,Xiaojun Chen
Hg2+, a highly toxic heavy metal, poses significant environmental and health risks, necessitating rapid detection methods. In this study, we employed an electrochemical aptasensor for rapid and sensitive detection of Hg2+based on DNA strands (H2 and H3) immobilized graphene aerogels-Au nanoparticles (GAs-AuNPs) hybrid recognition interface and exonuclease III (Exo III)-mediated cyclic amplification. Firstly, Gas-AuNPs were modified on the surface of the ITO electrode to form a sensing interface to increase DNA loading and accelerate electron transfer. Then, DNA helper was generated with the addition of Hg2+via Exo III-mediated cycling. Finally, the hairpin structures of H2 and H3 were opened with the DNA helper, and then the methylene blue (MB) functionalized DNA (A1 and A2) combined with the H2 and H3 to form an H-shaped structure. The current response of MB as an electrochemical probe was proportional to the concentration of Hg2+. Under optimal conditions, the aptasensor showed excellent performance for Hg2+, achieving a linear range from 1 fM to 10 nM and a detection limit of 0.16 fM. Furthermore, the aptasensor was used to detect Hg2+in spiked milk samples, achieving a high recovery rate and demonstrating promising application prospects.Keywords:graphene aerogels–Au nanoparticles;Hg2+;H-shaped;aptasensor;milk sample
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MACROMOLECULAR CHEMISTRY AND PHYSICS
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2023
·Vol. 224
·期 23
·2300304
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IF 2.5
Mingzhao Li,Jia Wang,Anjun Qin,Ben Zhong Tang
Hyperbranched polymers have been widely applied in various fields because of their good solubility, high reactive end groups, and low viscosity, etc. Therefore, it is of great importance to develop new strategies to build multifunctional hyperbranched polymers with novel architectures. In this work, a C(sp 3 )─H activation-based polymerization of internal alkynes and bifunctional secondary amines is successfully established, and multifunctional hyperbranched polyamines (hb-PAs) with 100% E -isomers and high molecular weights ( M w up to 76 500) are prepared in good yields (up to 82%). The hb-PAs containing tetraphenylethylene moiety show unique aggregation-enhanced emission properties and can be used for explosive detection with a low limit of detection (9.14 × 10 −8 m ). Notably, the hb-PAs display high refractive indices (up to 1.7607) that can be further modulated to 1.7825 by the coordination of its peripheral ethynyl group with metallic cobalt. Moreover, the hyperbranched structure endows the hb-PAs with much better properties than their linear counterparts, such as higher photoluminescence quantum yields and refractive indices. In addition, the hb-PAs can be modified by a C(sp 3 )─H activation reaction of internal alkynes and alcohols. This work not only prepares a series of functional nitrogen-containing hyperbranched polymers but also promotes the application of C(sp 3 )─H activation in polymer chemistry.
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Journal of Environmental Chemical Engineering
·
2023
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IF 7.7
Junyong He,Ya Yang,Peidong Hong,Yulian Li,Chao Xie,Zijian Wu,Minqiang Li,Lingtao Kong
The use of peroxymonosulfate (PMS) activation to eliminate organic contaminants is a promising technology to purify water owing to its strong reactivity. However, because of the existed rate limiting step, the performance of PMS activation was restrained and required external energy consumption. Therefore, a new strategy was proposed to solve this problem by preparing catalysts with abundant electron-rich sites and electron traps to accelerate PMS activation. In this research, a novel MnCeO x -H catalyst with rich surface oxygen vacancies was firstly synthesized to accelerate the transfer of electrons among the catalysts, oxidant and pollutants. The contaminants were rapidly eliminated in the MnCeO x -H/PMS system, while the reaction rate constant of MnCeO x -H/PMS system was 30 times higher than that of CeO 2 /PMS system. The surface oxygen vacancies were able to adsorb and trap PMS, then the free electrons of oxygen vacancies would reduce PMS and produced HO•, 1 O 2 and SO 4 •- , while 1 O 2 played a major role. The contaminants which acted as electron-donors in this system were adsorbed at Mn, Ce sites, achieving effective conversion recycling of Ce(IV)/Ce(III), Mn(III)/Mn(II) and Mn(IV)/Mn(III). This discovery is believed to inaugurate a novel way for designing powerful electron-rich sites and electron traps to accelerate PMS activation for contaminants degradation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Shiyue Hu,Junhong Liu,Xuanlan Luo,Qiqi Shen,Yu Qin,Haikun Hu,Jinhai Yuan,Shuangkou Chen,Di Xu
Currently, photocatalytic degradation is a fascinating technology due to its capability to treat escalating environmental problems by degrading chemicals like dyes and pharmaceuticals from wastewater. Herein, the hexagonal prism GQDs/h-MoO 3 composite photocatalyst was fabricated through a facile hydrothermal approach. The synthesized samples were identified by XRD , SEM, FT-IR, XPS , UV-Vis DRS , and PL technologies to study the crystal structure, morphology, surface chemical composition , and optical properties . The preparation circumstances of binary compounds, such as different GQDs (Graphene quantum dots) loading amounts, precursor solution pH, hydrothermal temperature, and hydrothermal time were optimized, also, and the photocatalytic activity of materials is determined by photodegradation of Methylene Blue in this approach, which systematically investigated the impact of operational conditions on the efficiency of the photocatalytic reaction. The results revealed that 10GQDs/h-MoO 3 has the best photocatalytic performance among competitors, which exhibited a high photodegradation efficiency (85.58%) of MB, and the rate was approximately 2.13 times greater than pristine h-MoO 3 . Moreover, the PL and EIS measurements proved the outstanding separation and migration ability of the photo-excited carriers of composite, which was attributable to the fact that GQDs can serve as electron transporters and acceptors to induce electron-hole separation efficiently. Finally, the free radical scavenging experiments confirmed that the primary active species was h + in the photocatalytic process, as well as a potential explanation for the improved photocatalytic activity of GQDs/h-MoO 3 photocatalysts was proposed.
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Materials
·
2023
·Vol. 16
·期 14
·4979
·
IF 3.4
Wen Zhong,Jiazhi Dong,Siqiang Chen,Zhe Tong
The synergistic effect of different types of solid particles in liquid lubricants is of great interest. In this work, g-C3N4nanosheets were initially prepared using a calcination method and then as-prepared, and h-BN were used as lubricating additives to the white oil. A comparison between the mixed additives and the single g-C3N4or h-BN additives revealed that the base oil with the addition of g-C3N4and h-BN showed the best lubricating properties. The results show a 12.3% reduction in friction coefficient, resulting in a 68.6% reduction in wear rate compared to the white oil when filled with 0.5 wt% g-C3N4and h-BN (1:1 by weight). Moreover, the addition of g-C3N4and h-BN improves the high-temperature lubrication properties of the white oil. However, the friction coefficient and wear rate increase with increasing oil temperature. The large contact area between g-C3N4and its sliding counterpart and the strong adhesive force between h-BN and its sliding counterpart improve the film formation efficiency, leading to enhanced tribological properties under oil lubrication conditions.
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