JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Sheng Luo,Fan Qin,Yin’an Ming,Huiping Zhao,Yunling Liu,Rong Chen
Hazardous hexavalent chromium removal from wastewater is an urgent issue in industry environmental pollution. In this work, hollow Bi 2 S 3 nanospheres have been successfully synthesized from unique Bi 2 O 3 porous nanospheres via Kirkendall effect through hydrothermal process. It was found that the sulfur source and the initial Bi 2 O 3 templates played key roles in the formation of the uniform morphologies and structures through an anion exchange process. Compared with other Bi 2 S 3 samples, the synthesized hollow Bi 2 S 3 nanospheres exhibited much enhanced photocatalytic ability for Cr(VI) photoreduction. XPS analysis demonstrated that Cr(VI) was reduced to less harmful Cr(III) species over hollow Bi 2 S 3 nanospheres under visible-light irradiation. More importantly, the hollow Bi 2 S 3 nanospheres remained high efficiency and good stability in the recycling Cr(VI) photoreduction, and exhibited remarkable Cr(VI) removal ability in actual electroplating industry wastewater treatment.
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MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 12
·3151-3157
·
IF 4.831
Yu Haili,Long Dengying
The authors describe a highly chemiluminescent metal-organic framework (MOF) that was obtained by loading the pores of MIL-101(Cr) with luminol. Immobilization is based on Lewis acid-base interactions between the coordinatively unsaturated metal sites of MIL-101(Cr) and the amino groups of luminol. The luminol-loaded MOF displays strong chemiluminescence (CL) in the presence of hydrogen peroxide (H 2 O 2 ) in alkaline solution. Pyrophosphate (PPi), in turn, acts as a quencher of this CL. These findings have been exploited in the design of a CL based method for the determination of either H 2 O 2 or PPi. The assays for H 2 O 2 works in the 3 to 100 μM concentration range and has a detection limit of 0.5 μM. The quenchometric assay for PPi works in the 5 to 70 μM concentration range and has a 1.2 μM detection limit.
Luminol-embedded metal-organic frameworks (MOFs) with high chemiluminescent activity were prepared and used for the sensitive determination of either H 2 O 2 or pyrophosphate ions.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2016
·
IF 3.138
Pan Hu,Jing Wang,Ruihua Huang
In this study, simultaneous removal of Cr(VI) and Amido Black 10B (AB10B) using quaternized chitosan coated bentonite was investigated by a batch method. The factors affecting adsorption process such as pH, adsorbent dosage, contact time and initial concentration and the interaction of two components in binary solutions have been studied. The results showed that the antagonism effect existed between Cr(VI) and AB10B in binary systems. The equilibrium time for Cr(VI) adsorption was less than the one for AB10B adsorption. The maximum adsorption capacities of the modified bentonite, according to the Langmuir isotherm model were 847.5 mg/g for AB10B and 66.6 mg/g for Cr(VI) at 298 K. The experimental results demonstrated that both Cr(VI) and AB10B were well described by the pseudo-second-order model. Thermodynamic study depicted that the adsorption of Cr(VI) and AB10B onto the modified bentonite was both spontaneous. The adsorption for Cr(VI) was exothermic while the one for AB10B was endoth- ermic in nature.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Yaru Li,Zhongmin Liu,Yongchuan Wu,Jitao Chen,Jingyu Zhao,Fengmin Jin,Ping Na
Carbon dots-TiO 2 nanosheets (CDs-TNs) composites were synthesized by hydrothermal method and applied for the first time in photoreduction of Cr(VI) under sunlight illumination. The materials were characterized by transmission electron microscope, X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectrometer, and X-ray photoelectron spectroscopy analysis. The results confirmed that CDs are successfully incorporated with TNs through Ti O C bonds. With the introduction of CDs, CDs-TNs composites exhibit excellent photoreduction performance of Cr(VI), which is higher than that of TNs, P25 and CDs-P25. The unique upconversion property and electron transfer property of CDs play essential roles on light harvesting and charge carriers transferring in the photoreduction process. Most importantly, CDs could facilitate the formation of H 2 O 2 , leading to the consumption of holes. As a result, the recombination of photoinduced electron-hole pairs is hindered and photoreduction activity of CDs-TNs is promoted.
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JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Qinghua Xu,Yulu Wang,Liqiang Jin,Yu Wang,Menghua Qin
A novel nanocomposite based on black wattle (BW) tannin and nanocellulose was prepared and applied in heavy metal ions adsorptive removal from aqueous solutions. Firstly, nanocrystalline cellulose was oxidized by sodium periodate to get dialdehyde nanocellulose (DANC). BW tannin was then covalently immobilized onto DANC, which was used as both the matrix and crosslinker, to obtain tannin-nanocellulose (TNCC) composite. The resulting nanocomposite was characterized using FTIR, AFM, and TG. The successful immobilization was confirmed by the chromogenic reaction between FeCl 3 and TNCC and FT-IR analysis. AFM images revealed that TNCC was ellipsoidal particles with lengths ranging from 100–400 nm. Zeta potential measurement showed that TNCC was negative charged at a pH range from 1–12. Compared to the original tannin, the thermal stability of TNCC was slightly increased by the addition of nanocellulose. TNCC demonstrated the maximum adsorption efficiency at pH 2 for Cr(VI) and pH 6 for Cu(II) and Pb(II), respectively. The adsorption for these three metal ions followed pseudo second-order kinetics, indicating the chemisorption nature. The adsorption isotherms all fitted well with the Sips model, and the calculated maximum adsorption capacities were 51.846 mg g −1 , 53.371 mg g −1 and 104.592 mg g −1 for Cu(II), Pb(II) and Cr (VI), respectively.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yanyan Xing,Mengke Tian,Ruoman Ji,Ting Wang,Xiaohong Hou
The immobilization of bovine serum albumin (BSA) with high efficiency, good reproducibility and stability for chiral separation has attracted much attention in the medicinal field. BSA was immobilized into MIL-101(Cr) by three ways for efficient chiral separation in this research. MIL-101(Cr)@BSA was firstly prepared by adsorption, NH 2 -MIL-101(Cr) ⊂ BSA by direct bonding, and NH 2 -MIL-101(Cr) ⊂ Glu ⊂ BSA by glutaraldehyde crosslinking bonding. Compared to the other two materials, NH 2 -MIL-101(Cr) ⊂ BSA as a new enantioselective separator, with the most BSA loading rate of 437.6 mg g −1 exhibited excellent chiral separation performances and succeeded in realizing a complete chiral separation of racemic 1–phenylethanol within 14 s. It was found that the NH 2 -MIL-101(Cr) ⊂ BSA was more strongly bound to R -1-phenylethanol and the ee value could reach 100 % when the material was added in three batches. The different interactions between BSA and racemates mainly including hydrogen bonding, hydrophobic interaction and π-π interaction were revealed by the molecular docking studies, especially hydrogen bonding, accounting for the observed selective chiral recognition capacity of racemic 1–phenylethanol of NH 2 -MIL-101(Cr) ⊂ BSA. Moreover, both of NH 2 -MIL-101(Cr) ⊂ BSA and NH 2 -MIL-101(Cr) ⊂ Glu ⊂ BSA showed excellent stability and reusability. This combination of theory and experiment provided a clearer basis for other researchers to have different requirements for protein immobilization, and provided new ideas and methods for the development of chiral selectors.
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FUEL
·
2024
·
IF 6.7
Fanjia Sun,Xueqing Tian,Jianbing Zang,Rui Zhu,Zhiwei Hou,Youbin Zheng,Yanhui Wang,Liang Dong
Transition metal sulfides, recognized for their platinum-like activity, were prominent in electrolytic water hydrogen production research. In this context, we reported a NiS/NiS 2 heterostructure composite active center electrocatalyst optimized by Cr doping (Cr-NiS/NiS 2 @NF) based on the dual regulation of defect engineering and interface engineering. The electronic structure of Ni and S could be adjusted by Cr doping, and the creation of defects exposed more active sites. Meanwhile, the resulting NiS/NiS 2 heterogeneous interface acted as a composite activity center, enhancing the alkaline HER process rate. The Cr-NiS/NiS 2 @NF achieved 100 mA cm −2 at an overpotential of 172.8 mV. Density functional theory analysis confirms the significant decrease in the water dissociation potential barrier, attributable to the electron redistribution caused by Cr doping. The optimized heterointerface functioned as a composite activity center. Here, the Cr-NiS component effectively facilitated water dissociation, while the NiS 2 component primarily enhanced H 2 generation and desorption. The introduction of Cr significantly improved the electronic coupling at the bi-phase interfaces, thereby accelerating the transport of hydrogen intermediates. This study revealed the modulation of electron distribution at the Cr-doped nickel sulfide heterointerface, offering deep atomic-scale insights. These findings provide novel perspectives for the field of hydrogen production via water electrolysis.
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Journal of Inorganic and Organometallic Polymers and Materials
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2024
·
IF 3.9
Liu Yuhao,Wang Xuyi,Chen Jiayue,Wang Hua,Cheng Ming,Zheng Dan,Zhang Beibo,Geng Liang,Chen Liping,Jia Yingbin,Wang Luoxin
In this work, we synthesized core-shell NH 2 -UiO-66@UiO-67 via a solvothermal method to achieve controlled assembly of amino-modified UiO-66 and UiO-67 at micro and nano scale. NH 2 -UiO-66@UiO-67 exhibited notable visible light responsiveness and an increased specific surface area.In addition, it demonstrated outstanding performance in Cr(VI) removal, which can be attributed to the photocatalytic conversion of Cr(VI) into less toxic Cr(III), and the adjustable pores and large specific surface area facilitating Cr(III) adsorption. Notably, it exhibited a robust removal efficiency across a wide pH range of 2.0 to 10.0. Specifically, at pH = 2.0, the Cr(VI) solution with a concentration of 60 mg/L was completely removed within 140 min. The results show that the adsorption of core-shell NH 2 -UiO-66@UiO-67 meets the pseudo-second-order adsorption kinetics and has the ability of photocatalytic reduction of Cr (VI).
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Xiupei Yang,Xiaofang Chen,Hanyu Yang,Yuxiu Fan,Ling Jiang,Feng Huo
With the development of electronics, electroplating, printing, and dyeing industries, environmental pollution caused by hexavalent chromium (Cr(VI)) has become increasingly prominent. Skin contact with Cr (VI) can cause allergies or genetic defects, and inhalation can cause cancer, which is a lasting danger to the environment and the human body. Developing effective strategies to monitor Cr(VI) in environmental water or industrial wastewater can evaluate the degree of water pollution and risk warning, thus helping to prevent the spread of Cr(VI) pollution, promote the protection of water resources and the ecological environment, and ensure human safety and sustainable development. On the basis of the regulation of dopamine, boron-doped zinc single-atom nanozymes (Zn/B-NC SAzymes) with three-dimensional nanoflower morphology were controlled in this work. The introduction of B in Zn/B-NC SAzymes and the high metal loading of Zn (6.5 wt%) led to the formation of more active sites, resulting in the material showing excellent enzyme-like activity. H 2 O 2 decomposed to generate superoxide radicals under the catalysis of Zn/B-NC SAzymes, which then oxidized the substrate 3,3′,5,5′-tetramethylbenzidine (TMB) to generate blue oxTMB. When Cr(VI) was introduced into the sensor system, the color of blue oxTMB is deepened, and the colorimetric method of Cr(VI) was constructed. The linear range is 0.2–40 μM, LOD is 59 nM, and the visual detection of Cr (VI) is performed with the aid of the smartphone. This work not only provides experimental and theoretical guidance for understanding the active centers of Zn-SAzymes and their catalytic processes, but also provides a promising and alternative detection strategy for the rapid and even visual on-site detection of Cr(VI) in aquatic environments, which is of great significance for the control of Cr(VI) pollution in the environment and industrial wastewater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yanping Dong,Xiqiang Tian,Shoulei Huang,Abdullah N. Alodhayb,Muhammad Zahid
The interfacial characteristics of platinum (Pt) metal catalysts can be systematically regulated by interacting them with electropositive metals, leading to synergistic interactions for extensive catalytic applications. In this study, an evenly dispersed polyol-synthesized iron (Fe)-promoted Pt bimetallic nanoparticle (BNPs) system was embedded in MIL-101(Cr). The PtFe 2 @MIL-101(Cr) catalyst unveiled remarkable activity (86%) and selectivity (89%) for the superior hydrogenation of the targeted C O bond of cinnamaldehyde (CAL). The exceptional hydrogenation performance can be credited to the interplay of the geometric and electronic properties arising from charge shuttling between Fe and Pt within the homogenously distributed Pt–Fe bimetallic nanoparticle system. The experimental results indicate enhanced valence electrons in the Pt d-band through the mutual synergetic interface between the Pt and Fe BNPs. Consequently, these Fe–Pt sites functioned as interfacial electrophilic and nucleophilic (Lewis acid-base) sites, enhancing H 2 activation and facilitating C O bond conversion to yield unsaturated cinnamal alcohols (COL). Additionally, the narrow pores of MIL-101(Cr) encapsulating the Pt–Fe BNPs induced steric hindrance, allowing only C O bond hydrogenation. Furthermore, the PtFe 2 @MIL-101(Cr) catalyst maintained its optimal hydrogenation performance over five cycles, demonstrating no substantial loss in either CAL conversion or COL yield, thus endorsing the universal practical applicability of the catalyst.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 9
·3954-3966
·
IF 9.931
Zhikai Yu,Xingmin Gao,Yan Yao,Xiangcheng Zhang,Guo-Qing Bian,Winston Duo Wu,Xiao Dong Chen,Wei Li,Cordelia Selomulya,Zhangxiong Wu,Dongyuan Zhao
Aerosol-assisted methods possess a strong capability for synthesis of titania (TiO2) microspheres. For dynamic separation applications, rough TiO2 microspheres with uniform large micron sizes, high external-surface-area-to-volume ratios, high surface areas, uniform mesopores and abundant hydroxyl groups are desirable. Herein, we demonstrate the combination of evaporation induced self-assembly (EISA) with a microfluidic-jet spray drying process for scalable synthesis of novel mesoporous TiO2 materials with the above-mentioned properties for Cr(VI) removal under both static and dynamic conditions. The TiO2 materials are spherical with uniform large micron sizes (∼45 μm). They possess wrinkled surfaces and thus have high particle external-surface-area-to-volume ratios. They show high surface areas (22–138 m2 g−1), large pore volumes (0.15–0.27 cm3 g−1) and uniform mesopores (5.2–20.7 nm). They carry abundant surface Ti–OH groups due to the presence of oxygen vacancies and the Ti3+ valence state. Several experimental parameters, such as drying and calcination temperatures, are varied, leading to TiO2 samples with tunable surface areas and mesopore sizes. They can be adopted as batch sorbents for removal of Cr(VI) in water with fast adsorption rates, large capacities and pH-dependent adsorption behavior. Part of the adsorbed Cr(VI) can be reduced to Cr(III) in acidic solutions. The influences of adsorbent properties on adsorption performance are elucidated. Moreover, their uniform large micron sizes make them excellent fillers for efficient separation of Cr(VI) in dynamic flows with similar performance to that under static conditions, as well as easy regeneration and high cycling stability. Their adsorption performance under flowing conditions is much better than those of commercial TiO2 nanoparticles and mesoporous TiO2 materials prepared by a conventional EISA method, which make them very attractive for practical dynamic separation applications.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 6
·4078-4088
·
IF 2.599
Su Yiping,Cui Mingfang,Zhu Jianhua,Wu Yayu,Wei Yaping,Bian Shicong
A feasible strategy is demonstrated here for low-cost and rapid synthesis of nanosheet-structured BaCO 3 spheres (NSBCs) on a large scale. Experiments reveal that NSBCs were developed from amorphous precursor under the mediation of phosphate. Their nanosheet-composed structures facilitate the rapid removal of contaminant of Cr(VI) within 60 min from aqueous solution, showing an excellent adsorption capacity ( q
m,cal = 227 mg/g, T = 298 K). The kinetic and isotherm processes confirmed well to the pseudo-second-order model and Langmuir adsorption model, respectively. Thermodynamic analysis indicated that the adsorption process was spontaneous and endothermic. NSBCs show better Cr(VI) removal behaviour compared with commercial and some synthetic barium carbonate, which may have potential application in water treatment.
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