Journal of Water Process Engineering
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2024
·
IF 6.3
Shuang Fu,Yingbo Chen,Xintong Wu,Liu Ye,Linzhe Xu,Xinyu Zhao
Nanofiltration (NF) membranes play a crucial role in wastewater treatment based on their unique separation mechanism. However, conventional polyamide nanofiltration membranes are susceptible to degradation in extreme pH or chlorine environments, resulting in a limited range of applications. In this study, hydrophilic functional coatings were constructed on polyethersulfone (PES) support using the biopolymer materials, κ-carrageenan (κ-CGN) and sodium carboxymethyl cellulose (CMC). The coatings were cross-linked with glutaraldehyde (GA) to form a dense three-dimensional network structure insoluble in water, enabling structural stability in harsh environments. The Na 2 SO 4 retention of the κ-CGN/CMC/PES composite membranes was maintained at 92.1 and 91.4 % after 38 days of immersion in 20 wt% H 2 SO 4 and 2 M NaOH aqueous solutions, respectively. Meanwhile, κ-CGN/CMC/PES maintained a good salt retention (Na 2 SO 4 , ∼90.0 %) after chlorine treatment (72,000 ppm h). The excellent separation performance of the κ-CGN/CMC/PES composite membranes at different pH and concentration of Cr (VI) indicated its wide application for Cr(VI) removal at harsh conditions.
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MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 7
·2235-2240
·
IF 4.831
Yang Xiaoqing,Xia Yan
Mass spectrometry (MS) is the most powerful tool in phosphoproteomics research. However, phosphopeptides usually are present in low concentrations and their preconcentration therefore is highly desired. We describe a two-step method for the synthesis of a metal organic framework of the type MIL-101(Cr) that is modified with urea (then designated as MIL-101(Cr)-UR 2 ). It possesses large surface area, good solvent stability and high affinity for some phosphates. Due to the presence of modified urea functions, this material allows for selective and effective enrichment of phosphorylated peptides. It was successfully applied to the enrichment of phosphopeptides from non-fat-milk. The method was applied to the detection of phosphopeptides in a tryptic digest of β-casein where is showed a detection sensitivity as low as 10 −10 M.
A two step method was designed to synthesis MIL-101(Cr)-UR 2 and the prepared green solid was successfully applied to recognize phosphopeptides. (Amino functionalized metal-organic framework (MOF-NH 2 ); urea modified metal-organic framework (MOF-UR 2 ); matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS))
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2016
·
IF 3.782
Nannan Qin,Ya Zhang,Hongjian Zhou,Zhigang Geng,Gang Liu,Yunxia Zhang,Huijun Zhao,Guozhong Wang
The reactivity of zero valent iron (Fe 0 ) for removing Cr(VI) is self-inhibiting under neutral and alkaline conditions, due to the precipitation of ferrous hydroxide on the surface of Fe 0 . To overcome this difficulty, we incorporated a second metal (Co) into Fe 0 to form FeCo bimetallic nanoparticles (FeCo BNPs), which can achieve higher activity and significant improvement in the reaction kinetics for the removal of Cr(VI) compared with Fe 0 . The FeCo BNPs were synthesized by a hydrothermal reduction method without using any templates. The characterization analysis indicated that the products were highly uniform in large scale with 120–140 nm size in diameter. The obtained FeCo BNPs exhibited a remarkable removal ability for Cr(VI) in the pH range of 5.3–10.0. Especially, FeCo BNPs were able to reduce trace Cr(VI) (1.0 mg L −1 , pH = 7.5) down to about 0.025 mg L −1 within 1 h. XPS analysis confirmed that Cr(VI) was reduced to Cr(III) by FeCo BNPs, while Fe and Co was oxidized, implying a chemical reduction process. The enhanced removal of trace Cr(VI) could be originated from the introduction of Co, which not only served as a protecting agent against surface corrosion by galvanic cell effect, but also enhanced the efficient flow of electron transfer between iron and Cr(VI). All the results primarily imply that FeCo BNPs can be employed as high efficient material for wastewater treatment.
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高影响因子
INORGANICA CHIMICA ACTA
·
2017
·
IF 2.002
Jie Chai,Yanfei Liu,Jinglong Dong,Bin Liu,Binsheng Yang
The worldwide use of chromium(III) picolinate Cr(pic) 3 as nutrition additives has aroused more and more controversies. To reevaluate the safety and validity of Cr(pic) 3 , seven new derivatives Cr(R-pic) 3 (pic = picolinic acid, R = H ( 1 ), 5-Br ( 2 ), 5-CF 3 ( 3 ), 4-Cl ( 4 ), 5-COOH ( 5 ), 3-CH 3 ( 6 ), 5-OH ( 7 ), 3-OH ( 8 )) were synthesized and characterized by X-ray crystal diffraction, ESI-MS, IR and elemental analysis. It was found that different substituent group affected physicochemical activities of the complex such as the Fenton-like reaction and oxidation reaction. Especially, –OH group derivatives lose their hydroxyl radical-generation and Cr(VI)-generation abilities comparing with halogen group in tube experiment. Even so, these differences in chemistry properties may be ignored in live cells and animal tests: no obvious cellular damage (MTT assay) and tissue injury (acute toxicity study) were observed for both Cr(pic) 3 and its derivatives. In addition, hypoglycemic activity study indicated that these Cr(III) complexes have no significant influence than CrCl 3 salt on the blood glucose, serum insulin, total cholesterol, triglyceride, high density lipoprotein and low density lipoprotein of diabetic mice through two months’ study. Therefore, these substituent group is unable to improve the biological activities of Cr(pic) 3 obviously and the validity of Cr(pic) 3 used as a nutrition additives is doubted.
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CHINESE JOURNAL OF CHEMISTRY
·
2014
·Vol. 32
·期 5
·434-442
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IF 1.04
Changhua Song,Hui Liu,Yuan Li,Shuai Ge,Hongwei Wang,Wenshuai Zhu,Yonghui Chang,Changri Han,Huaming Li
A series of metal-Al 2 O 3 catalysts were prepared simply by the conventional impregnation with Al 2 O 3 and metal chlorides, which were applied to the dehydration of fructose to 5-hydroxymethylfurfural (HMF). An agreeable HMF yield of 93.1% was achieved from fructose at mild conditions (100°C and 40 min) when employing Cr(III)-Al 2 O 3 as catalyst in 1-butyl-3-methylimidazolium chloride ([Bmim]Cl). The Cr(III)-Al 2 O 3 catalyst was characterized via XRD, DRS and Raman spectra and the results clarified the interaction between the Cr(III) and the alumina support. Meanwhile, the reaction solvents ([Bmim]Cl) collected after 1 st reaction run and 5 th reaction run were analyzed by ICP-OES and LC-ITMS and the results confirmed that no Cr(III) ion was dropped off from the alumina support during the fructose dehydration. Notably, Cr(III)-Al 2 O 3 catalyst had an excellent catalytic performance for glucose and sucrose and the HMF yields were reached to 73.7% and 84.1% at 120°C for 60 min, respectively. Furthermore, the system of Cr(III)-Al 2 O 3 and [Bmim]Cl exhibited a constant stability and activity at 100°C for 40 min and a favorable HMF yield was maintained after ten recycles.
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ELECTROCHIMICA ACTA
·
2013
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IF 3.777
Ruizhuo Ouyang,Wangyao Zhang,Shilin Zhou,Zi-Ling Xue,Lina Xu,Yingying Gu,Yuqing Miao
We report here the successful fabrication of an improved Bi film wrapped single walled carbon nanotubes modified glassy carbon electrode (Bi/SWNTs/GCE) as a highly sensitive platform for ultratrace Cr(VI) detection through catalytic adsorptive cathodic stripping voltammetry (AdCSV). The introduction of negatively charged SWNTs extraordinarily decreased the size of Bi particles to nanoscale due to electrostatic interaction which made Bi(III) cations easily attracted onto the surface of SWNTs in good order, leading to higher quality of Bi film deposition. The obtained Bi/SWNTs composite was well characterized with electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), the static water contact angle and the voltammetric measurements. The results demonstrate the improvements in the quality of Bi film deposited on the surface of SWNTs such as faster speed of electron transfer, more uniform and smoother morphology, better hydrophilicity and higher stripping signal. Using diethylene triaminepentaacetic acid (DTPA) as complexing ligand, the fabricated electrode displays a well-defined and highly sensitive peak for the reduction of Cr(III)–DTPA complex at −1.06 V (vs. Ag/AgCl) with a linear concentration range of 0–25 nM and a fairly low detection limit of 0.036 nM. No interference was found in the presence of coexisting ions, and good recoveries were achieved for the analysis of a river sample. In comparison to previous approaches using Bi film modified GCE, the newly designed electrode exhibits better reproducibility and repeatability toward aqueous detection of trace Cr(VI) and appears to be very promising as the basis of a highly sensitive and selective voltammetric procedure for Cr(VI) detection at trace level in real samples.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2016
·
IF 3.782
Jiabai Cai,Xueqing Wu,Fengying Zheng,Shunxing Li,Yaling Wu,Yanping Lin,Liting Lin,Biwen Liu,Qiaoying Chen,Luxiu Lin
After polystyrene@titanium dioxide (PS@TiO 2 ) composite with different size was calcined at designated temperature, TiO 2 hollow sphere with controllable size was obtained for high efficient photo-reduction of Cr(VI). The feature of the TiO 2 hollow sphere was investigated by SEM, TEM , XRD , UV–Vis, and photoluminescence . The photo-reduction of Cr(VI) were measured for the performance assessment of the TiO 2 hollow sphere, Cr(VI) was used as an electron acceptor . After irradiation for 2 h, the photo-reduction rate of Cr(VI) (pH = 2.82) for TiO 2 (450 nm) was 96%, which exhibited an increase of 5% and 8% compared with TiO 2 (370 nm) and TiO 2 (600 nm). The absorption edges of TiO 2 hollow sphere (450 nm) was largest with the increasing of hollow sphere size from 370 to 600 nm. The optimal hollow sphere size of TiO 2 was 450 nm for the photo-reduction of Cr(VI), because the light-harvesting efficiency (the best of absorption edge) and photo-generated electron-hole separation rate (the best of photo-reduction rate) of TiO 2 hollow sphere were controlled by its hollow sphere size. In addition, we find that the behavior of the hydrogen production was inhibited by the coexistence Cr(VI) solution. This study can improve our understanding of the mechanism for the activity enhancement by the optimal hollow sphere size of TiO 2 .
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2017
·
IF 1.174
Jianhua Chen,Xue Sun,Lijing Lin,Xinfei Dong,Yasan He
In the present paper, a metal–organic framework Cr-BDC was prepared and used as adsorbent for adsorption of o -nitrophenol (ONP) and p -nitrophenol (PNP) from aqueous solutions. Cr-BDC was characterized by scanning electron microscopy, transmission electron microscope, X-ray diffraction and BET methods. The results indicate that Cr-BDC gets a very large specific surface area of 4128 m 2 ·g − 1 and pore sizes are concentrated in 1 nm, which is a benefit for using for wastewater treatment . The influences of the adsorption conditions, such as temperature, solution concentration, adsorption time and reusability on adsorption performance were investigated. Cr-BDC exhibited an encouraging uptake capacity of 310.0 mg·g − 1 for ONP, and adsorption capacity of Cr-BDC for ONP is significantly higher than that for PNP under suitable adsorption conditions. The characterizations of adsorption process were examined with the Lagergren pseudo-first-order, the pseudo-second-order kinetic model, and the intra-particular diffusion model. Kinetics experiments indicated that the pseudo-second-order model displayed the best correlation with adsorption kinetics data. Furthermore, our adsorption equilibrium data could be better described by the Freundlich equation. The results indicate that the as-prepared Cr-BDC is promising for use as an effective and economical adsorbent for ONP removal.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Hammad Eman N.,Eltaweil Abdelazeem S.,Abouelenein Saeyda A.,El-Subruiti Gehan
Water contamination by heavy metals, especially chromium (VI), poses a critical environmental issue due to its carcinogenic nature and persistence in the environment. Addressing this, the current study develops an efficient adsorbent, CPBr-MIL-88A@AmGO, which utilizes the synergistic capabilities of Cetylpyridinium bromide–modified MIL-88A and amine-functionalized graphene oxide to enhance Cr(VI) removal from aqueous solutions. The obtained results indicate that CPBr-MIL-88A@AmGO achieves its highest removal efficacy at pH 2, where the interaction of CPBr and AmGO’s positively charged centers significantly contributes to the adsorption processes. According to the Langmuir isotherm model, the composite’s adsorption capacity reached a maximum of 306.75 mg/g. The adsorption kinetics adhered to a pseudo-second-order model along with the endothermic nature of the process. Although the presence of SO 4 2- ions significantly reduces adsorption capacity, other interfering ions including Na + , K + , Ca 2+ , Cl - , and NO 3 - only slightly affect it. Remarkably, the composite maintains high removal efficiency, over 82%, even after 7 recycling tests, underscoring its potential for practical applications in water treatment systems. The proposed mechanism involves the contribution of electrostatic attractions, ion exchange, complexation, and the reduction of Cr(VI) to Cr(III) in the removal process. This study not only offers a potent solution for Cr(VI) remediation but also contributes to sustainable water resource management.
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RSC Advances
·
2024
·Vol. 14
·期 39
·28320-28331
·
IF 3.9
Linjie Yi,Hongwei Wang,Xianliang Ren,GaoBin Liu,Hongen Nian,Zhiqin Zheng,Fang Wu
Structural modification is expected to be a facile way to enhance the adsorption performance of MXene. In this work, the structural modification of Ti3C2Tx was carried out by a spray freezing method, and two kinds of nano-structure (spherical and flaky) of Ti3C2Tx were prepared by adjusting the solution concentration of Ti3C2Tx. Then the Cr(VI) adsorption capacity and removal efficiency of the spherical and flaky Ti3C2Tx was investigated, respectively. It is found that flaky Ti3C2Tx was produced with a Ti3C2Tx concentration of 3 mg mL−1, while spherical Ti3C2Tx was obtained with a concentration of 6 mg mL−1. The long diameter of flaky Ti3C2Tx is about 8–10 μm, and the specific surface area is 17.81 m2 g−1. While spherical Ti3C2Tx had a diameter of about 1–4 μm and a specific surface area of 17.07 m2 g−1. The optimized structure of flaky and spherical Ti3C2Tx improves the maximum adsorption capacity by 97% and 33%, respectively, compared with the few-layer Ti3C2Tx. The maximum adsorption capacity of flaky Ti3C2Tx was 928 mg g−1, while that of spherical Ti3C2Tx was 626 mg g−1. The adsorption capacity of both Ti3C2Tx structures decreased with the increase of pH, and reached the maximum value at pH = 2; meanwhile, the adsorption capacity of both Ti3C2Tx structures increased with the increase of Cr(VI) concentration. The adsorption of Cr(VI) on flaky Ti3C2Tx was very fast, reaching equilibrium in 3 min, while spherical Ti3C2Tx took 5 min. The adsorption of Cr(VI) on both Ti3C2Tx structures belonged to the monolayers, heat-absorbing chemical adsorption, and the diffusion process of Cr(VI) was regulated by the external diffusion and internal diffusion of particles. Its adsorption mechanism was the combination of reductive adsorption and electrostatic adsorption.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Liqing Zhang,Bo Li,Yonggang Wei,Haoyuan Xu
Environmental problems caused by Cr(VI) need to be solved urgently. As a green and safe adsorbent, magnesium oxide has the characteristics of strong adsorption capacity and safety, non-toxic and harmless. In this study, high-performance Cr(VI) adsorption material (F-MgO) was prepared by combination hydrothermal modification of recycling MgO and doping of solid waste fly ash with the MgO that was a by-product of high magnesium laterite nickel ore. The adsorption properties of F MgO composites for Cr(VI) were evaluated, and the maximum adsorption capacity of Cr(VI) by F MgO reaches 172.6 mg/g at pH = 2.0. The F-MgO also showed high stability and excellent cycle adsorption performance. The adsorption mechanism was extensively studied by adsorption kinetics and DFT theoretical calculation, and electrostatic adsorption and chemical interaction between Cr(VI) and F MgO active sites were demonstrated. The prepared F MgO composites from waste resources with a simple synthetic method have great potential in the treatment of chrome-containing wastewater to achieve the purpose of treating waste with waste.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Han Xu,Qin Yang,Mingjiao Tian,Yaruo Zhao,Dong Guo,Zeyu Jiang,Yanfei Jian,Yadi Wang,Fan Dang,Chunli Ai,Jialei Wan,Reem Albilali,Chi He
Revealing the mechanism behind active oxygen species in chlorinated volatile organic compounds (CVOC) destruction is crucial but challenging. Herein, we designed a chromium-substituted titanium bimetal catalyst with strengthened element interaction, exhibiting remarkable ability to activate oxygen and destroy intermediates. Encapsulated chromium species triple the electron transfer speed (Cr → TiO 2 ), converting 90 % of vinyl chloride at 244 °C. The constructed Cr 6 + −O−Ti 3+ structure distorts TiO 2 lattice, generating defects that promote oxygen species activation. In-situ technologies and DFT calculations demonstrate that vinyl chloride adsorbed at Cr 6+ =O sites is oxidized by lattice oxygen, forming C O species, while surface oxygen activates in a cyclic process, promoting the *CH 2 CH to *CH 2 CHO and CH 2 CO. The constructed Cr-O-Ti structure breaks the rate-limiting step of *CH 2 CHO to CH 2 CO process, accelerating the formation of *CH 3 CO and further promoting the deep oxidation process (*CHO + *CO). This work presents new findings towards CVOC highly efficient purification, showcasing significant application potential.
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