CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Jianhua Feng,Sen Xiong,Li Ren,Yong Wang
Chromium (Cr) is a common heavy metal that has severe impacts on the ecosystem and human health. Capacitive deionization (CDI) is an environment-friendly and energy-efficient electrochemical purification technology to remove Cr from polluted water. The performance of CDI systems relies primarily on the properties of electrodes. Carbon-nanotubes (CNTs) membranes are promising candidates in creating advanced CDI electrodes and processes. However, the low electrosorption capacity and high hydrophobicity of CNTs greatly impede their applications in water systems. In this study, we employ atomic layer deposition (ALD) to deposit TiO 2 nanoparticulates on CNTs membranes for preparing electrodes with hydrophilicity. The TiO 2 -deposited CNTs membranes display preferable electrosorption performance and reusability in CDI processes after only 20 ALD cycles deposition. The total Cr and Cr(VI) removal efficiencies are significantly improved to 92.1% and 93.3%, respectively. This work demonstrates that ALD is a highly controllable and simple method to produce advanced CDI electrodes, and broadens the application of metal oxide/carbon composites in the electrochemical processes.
研究领域:
环境科学
·
材料科学
·
水处理技术
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Qiang Qu,Ling Qiu,Ming-Zhuo Li,Guo-Tao Sun,He-Yu Chen,Xiao-Hui Guo
Magnetic biochar was successfully prepared from the waste Zanthoxylum branch and applied for Cr (VI) removal from wastewater. Modification parameters including concentration of iron-containing solution, ratio of Fe (III)/Fe (II), and pyrolysis temperatures were systematically investigated. There was a synergistic effect of synthesis conditions on the porous structure and the form distribution of iron. Based on the adsorption experiments, 900MZB8–1 displayed the best Cr (VI) removal performance (42.68 mg/g). The fitting result confirmed that the Cr (VI) removal reaction was the homogeneous chemisorption , and the predicted maximum removal capacity could reach at 215.44 mg/g. Moreover, the XPS analysis indicated that 79 % of Cr (VI) on adsorbent surface was transformed to Cr (III) by the cooperation of oxygen-containing functional groups and reductive iron. Meanwhile, 900MZB8–1 maintained the eminent removal efficiency of 80.65 % after four regeneration cycles. Additionally, the economic feasibility and practical performance indicated the rich-potential adsorbent for Cr (VI) removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2017
·
IF 2.764
Yu Gao,Wuzhu Sun,Weiyi Yang,Qi Li
Palladium nanoparticles were deposited on the amine-grafted glass fiber mat (GFM-NH 2 ) catalyst support by a conventional impregnation process followed by the borohydride reduction in aqueous solution at room temperature to create the designed Pd/GFM-NH 2 catalyst. By the use of large size glass fiber mat without nano/mesopores as the catalyst support, the internal mass transfer limitations due to the existence of nano/mesopores on the catalyst support were eliminated and the Pd/GFM-NH 2 catalyst could be easily separated from treated water due to the large size of the catalyst support. Batch experiments demonstrate its good catalytic reduction performance of Cr(VI) with formic acid as the reducing agent. It also demonstrated an efficient Cr(VI) removal and stability in a lab-prepared, packed fixed-bed tube reactor for the continuous treatment of Cr(VI)-containing water. Thus, it has a good potential for the catalytic reduction of Cr(VI) in the water treatment practice.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Siqi Xiao,Luming Ma,Wenhui An,Pengfei Shen
Catalytic ozonation for advanced treatment of industrial wastewater has proved to be effective, and the stability of the catalyst is crucial for the long-term application of the ozonation process in practical engineering. In this study, the electrochemical characteristics of four iron (Fe) shavings: alloy steels (38CrMoAl and 40Cr) and carbon steels (A3 and 45#) were investigated, and a new citric acid-optimized H 2 O 2 modification method was proposed. The low open circuit potential (OCP) of carbon steels indicated that they were more likely to be oxidized therefore required shorter modification times. The higher the OCP of alloy steels, the higher H 2 O 2 concentration was required to enhance modification efficiency. By adding citric acid, the rapid modification of alloy steel was achieved, and the catalysts exhibited lower passivation current (I p ), indicating a lower rate of substrate loss and a longer lifetime of alloy steel catalysts. Furthermore, chromium (Cr) enrichment occurred in the oxide layer of alloy steel catalysts. The Cr/Fe (atomic ratio) in oxide layer for 38CrMoAl and 40Cr increased from 0.018 to 0.040 and from 0.010 to 0.037, respectively. The presence of CrOOH and Cr 2 O 3 within the oxide layer reinforced the layer’s overall structural integrity and enhanced its protection for the internal substrate, making the catalysts more resistant to adapt to high-salinity wastewater. Through laboratory tests, it was found that among the four catalysts, 38CrMoAl showed the highest stability and good catalytic activity with low Fe loss concentration. Therefore, the pilot-scale application effect of 38CrMoAl catalyst was evaluated. In the advanced treatment of pharmaceutical wastewater, chemical oxygen demand (COD) and total organic carbon (TOC) removals were 56.3% and 32.4%, respectively. These results showed that the stability of catalyst can be improved by optimizing the selection of steel, and the introduction of citric acid achieved Cr enrichment effect and amplified the potential stability advantage of alloy steel. The research provides guidance on raw material selection for catalyst preparation to different industries' wastewater treatment, especially in high-salinity wastewater ozonation treatment, which can realize the long-term stable application of catalyst.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Hua-Rong Yang,Shan-Shan Li,Xiang-Cheng Shan,Chen Yang,Qing-Da An,Shang-Ru Zhai,Zuo-Yi Xiao
Novel millimeter-scale hollow polyethyleneimine/carboxymethylcellulose beads were facilely prepared by simply adjusting the usage of polyethyleneimine for surface modification of preformed solid carboxymethylcellulose beads, which were gradually transformed into hollow beads during the glutaraldehyde mediated cross-linking process. Taking advantage of the hollow structure and porous shells which possess abundant, accessible sorption sites, this newly designed bead-like sorbent exhibited very high adsorption capacity for Cr(VI) and phosphates, for which the exceptional value of 535.39 mg/g and 150.65 mg/g was achieved under fitting conditions, respectively, and both of them much superior to most reported studies. Most importantly, the adsorption capacity for Cr(VI) and phosphate over the typical sorbent remained at high levels even after 6 and 22 cycles, respectively, which is another feature of the hollow bead-like sorbent. Based on various characterization results like SEM-EDX, FT-IR, TGA, zeta potential, XPS, etc., it showed that the adsorption mechanism of Cr(VI) over as-fabricated hollow bead-like sorbents could be mainly correlated to the electrostatic attraction and reduction manner, while the adsorption process of phosphate was mainly due to the electrostatic interaction. By its millimeter-sized shape with surface accessible sorption sites, the column adsorption testing revealed that the Thomas model fitted well with the phosphate adsorption process. Given its controllable fabrication process, excellent adsorption performance, and exceptional mechanical properties, this newly designed millimeter-scale hollow bead-like sorbent has promising applications in the field of anionic pollutant removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Fei Chen,Qi Yang,Yali Wang,Fubing Yao,Yinghao Ma,Xiaoding Huang,Xiaoming Li,Dongbo Wang,Guangming Zeng,Hanqing Yu
Despite massive research efforts are devoted into wastewater treatment, the coexistence of organic compounds and heavy metals is an escalating environmental problem, especially in surface waters. In this work, a rapid reduction of Cr(VI) and oxidation of refractory ciprofloxacin (CIP) were achieved simultaneously by the Ag/AgBr decorated BiVO 4 Z-scheme heterojunction under visible light irradiation. The ternary photocatalyst was fabricated by a facile hydrothermal method, followed by photoreduction process. Superior photocatalytic performance of Ag/AgBr/BiVO 4 was not only reflected in single Cr(VI) reduction or CIP oxidation, but also displayed in simultaneous removal of two contaminants, which should be attributed to the enhanced visible light absorption, high charge carriers separation efficiency and redox of their photo-generated electrons and holes in the constructed Z-scheme heterostructure. Characterization methods including UV–vis absorption spectra (UV–vis DRS), transient photocurrent response (PC), photoluminescence spectra (PL) and electrochemical impedance spectra (EIS) were employed to confirm the mechanism. The active species trapping experiments and electron spin resonance (ESR) measurements demonstrated that h + , O 2 − and OH all participated in CIP degradation, while e − and O 2 − were the main active groups for Cr(VI) reduction. The presence of Ag facilitated a Z-scheme Ag/AgBr/BiVO 4 photocatalyst due to its electron mediator role. The CIP mineralization was verified by three-dimensional excitation-emission matrix fluorescence spectra (3D EEMs) and total organic carbon (TOC) removal. At last, the possible CIP degradation pathway was also proposed. This work will provide a new route to design the novel Z-scheme photocatalysts for the simultaneous degradation of organic pollutants and reduction of heavy metal ions in water.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 91
·74629-74637
·
IF 3.84
Yunling Gao,Jieming Shu,Cong Zhang,Xiang Zhang,Haiyan Chen,Kejian Yao
A new coumarin–quinoline based sensor 1 has been synthesized. The paramagnetic Cu2+ ion turned off the fluorescence of sensor 1 with a 1 : 1 binding stoichiometry. The resultant 1–Cu2+ complex could act in situ as an efficient “off–on” fluorescence sensor for the paramagnetic Cr3+ ion triggered by the 1 : 1 replacement of Cu2+ with Cr3+. This selective fluorescence “on–off–on” sensor was used to identify Cu2+ and Cr3+ in living breast cancer MCF-7 cells using confocal fluorescence microscopy, indicating that sensor 1 has a potential application for the selective detection of Cu2+ and Cr3+ in living cells.
研究领域:
生物化学
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分析化学
·
细胞生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Peng Liao,Binrui Li,Lin Xie,Xiaoao Bai,Han Qiao,Qianqian Li,Biwei Yang,Chongxuan Liu
Engineered nanoparticles-mediated contaminant transport has been recognized as a significant process governing the mobility of metals and radionuclides in groundwater. Engineered silicate nanoparticles (ESNPs) are attractive materials for the sequestration or extraction of Cr(VI) and other metals and radionuclides from groundwater. While great efforts have been devoted toward the application of these materials for Cr(VI) sequestration, the underlying interface adsorption mechanism is not thoroughly elucidated. This study investigates the immobilization mechanisms of Cr(VI) on a representative ESNPs, NH 2 -MCM-41, over a range of water chemistry conditions. By combining batch adsorption experiments with an array of complementary characterizations, we provided spectroscopic and microscopic evidence that the electrostatic interactions between the positively charged NH 2 -MCM-41 surface derived from amino functionality and the negatively charged Cr(VI) species was the dominant mechanism responsible for Cr(VI) immobilization. In addition, the weak hydrogen bonding interactions may also contribute to adsorption to a degree. Furthermore, thermodynamic studies suggested a favorable, spontaneous, and exothermic adsorption process. Site energy analysis illustrated that the distribution of energy binding sites on NH 2 -MCM-41 is Cr(VI) loading dependent. The new insights provided here can advance understanding of the transport of Cr(VI) associated NH 2 -MCM-41 that benefits the application of ESNPs-based technologies for metals immobilization in groundwater.
研究领域:
环境科学
·
纳米技术
·
污染治理
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 3
·1319-1328
·
IF 3.591
Sijing Zeng,Dengjie Zhong,Yunlan Xu,Nianbing Zhong
In order to improve the reactivity of nZVI for Cr(VI) removal, porous styrene resin loaded carboxymethyl cellulose-stabilized nano-zero-valent iron (CMC-D201@nZVI) was first prepared by the simple liquid phase reduction method. Its morphology, chemical properties and Cr(VI) removal performance were investigated. CMC–nZVI with nZVI as the core and CMC as the shell loaded on the surface of D201 exhibits excellent stability, longevity and regeneration performance. This is because the special framework structure of D201 weakens the agglomeration of nZVI, and the positively charged quaternary amine groups on its surface can electrostatically adsorb Cr(VI). nZVI enhances its stability through the combination of bidentate bridging with CMC. The CMC layer further improves the distribution and mobility of nZVI by electrostatic repulsion and steric hindrance, and simultaneously can complex the products (Fe(III), Cr(III), CrxFe1−xOOH or CrxFe1−x(OH)3) in the reaction system to promote the adsorption process. Under the conditions of pH 4.90, adsorption dose 50 mg, temperature 298 K, and shaker speed 150 rpm, the maximum adsorption capacity of 0.05 CMC-D201@nZVI is 169.24 mg g−1. Its adsorption behavior is spontaneous single-layer chemical adsorption. This study provides a new idea for the design of efficient adsorption materials for Cr(VI) removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Liying Yu,Lingyu Zhang,Guojuan Ren,Shuang Li,Baoya Zhu,Fang Chai,Fengyu Qu,Chungang Wang,Zhongmin Su
In this article, we reported a dual emissive multicolorful fluorescent-nanoprobe which was composed of gold nanocluster (BSA-Au NCs) and carbon dots (CDs) with a certain proportion, i.e. Au NCs-CDs. The dual emissive Au NCs-CDs showed pink fluorescence under UV light, and the dual emission peaks at 625 nm and 444 nm were corresponded to the existence of Hg 2+ and Cr 6+ respectively. The fluorescence color transformed from pink to blue when in presence of Hg 2+ . The blue fluorescence emission of CDs selectively quenched by Cr 6+ , whereas the red fluorescence of BSA-Au NCs was stable against Cr 6+ , which can be treated as internal reference. The difference response of the two emissions to Hg 2+ and Cr 6+ resulted in a distinguished fluorescent color change, which can be noticed by the naked eyes clearly. When the Hg 2+ and Cr 6+ were exposed to the Au NCs-CDs simultaneously, the dual-emission of the Au NCs-CDs were all reduced and exhibited the complete quenching of the pink emission. The detection limits for Hg 2+ and Cr 6+ were 1.85 nM and 5.34 nM, respectively. Significantly, it was successfully applied to determine the existence of Hg 2+ and Cr 6+ in real samples, which offered the advantages of simplicity, environmentally friendly and cost saving efficiency.
研究领域:
分析化学
·
纳米生物技术
·
环境监测
·
毒理学
·
分子探针
·
环境健康
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Wei Fang,Xianying Jiang,Hanjin Luo,Junjie Geng
A novel hybrid nanocomposite, polypyrrole nanoparticles (PPy) anchored on the graphene/silica nanosheets with the high specific surface area (polypyrrole-graphene/silica, GS-PPy), was synthesized by a facile in situ polymerization and shows great potential to remove hexavalent chromium [Cr(VI)] in aqueous solutions. Characterizations by XRD , TEM, SEM, BET, FT-IR and XPS, have confirmed that the PPy nanoparticles were well-distributed on the surface of GS nanosheets . The effects of pH, contact time, the concentration of Cr(VI), temperature, coexisting ions and the number of adsorption-desorption cycles were studied. The maximum adsorption capacity of the GS-PPy for Cr(VI) was 429.2 mg g −1 at 298 K at pH 2, which was much higher than PPy nanoparticles and other related materials. The adsorption data fitted to the pseudo-second-order model and Langmuir isotherm model. The removal mechanism involved in electrostatic attraction, ion exchange and reduction process that partial adsorbed Cr(VI) was reduced to Cr(III). And Cr(III) was still retained on the surface of GS-PPy. The GS-PPy nanocomposite will be a potential candidate for the removal of Cr(VI) from the industrial waste water.
研究领域:
环境科学
·
材料科学
·
纳米技术
·
环境污染与控制
·
物理化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 18
·4602-4607
·
IF 7.779
Meng Zhao,Shengqiang Liu,Hao Cai,Fangyi Zhao,Zhen Song,Quanlin Liu
Near-infrared (NIR) light devices have great potential in non-destructive testing and biomedicine fields. However, the lack of stable and efficient long wavelength NIR phosphors hinders their development. In this work, utilizing the compositional flexibility of antimonate double perovskites, we realized efficient and tunable broadband NIR emissions based on A2MSbO6:Cr3+ materials (A = Ca, Sr, and Ba; M = Ga, In, Sc, and Y). The NIR emission peaks ranged from 825 to 1010 nm by a composition modulation. In particular, Ca2ScSbO6:Cr3+ exhibits an 850 nm-centering broadband NIR emission with an internal quantum efficiency of 84.5% and a high thermal quenching temperature, retaining ∼71% at 410 K of the initial intensity at 80 K. Comparatively, Sr2InSbO6:Cr3+ with a 920 nm-centering broadband emission has 63.2% internal quantum efficiency. This work could help in discovering novel NIR phosphors with long-wavelength emissions and high efficiency.
研究领域:
生物医学工程
·
材料科学
·
光学成像
·
无损检测
·
分子探针开发
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）