RSC Advances
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2018
·Vol. 8
·期 23
·12870-12878
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IF 2.936
Li Tan,Hailong Li,Mengru Liu
In this study, CMC–LDH beads were prepared and characterized using SEM, FTIR and TG analysis. The beads were applied for the removal of Cr(VI) from aqueous solution. The effects of adsorbent dosage, initial pH and initial concentration of Cr(VI) solution on Cr(VI) uptake were investigated in detail. Moreover, adsorption isotherms and adsorption kinetic models were employed to analyze the adsorption process, and a preliminary study of the reusability of the adsorbent was performed. The experimental results showed that the CMC–LDH beads could remove Cr(VI) from aqueous solution efficiently. When the initial concentration of the Cr(VI) solution was 100 mg L−1 and the adsorbent dosage was 12 g L−1, the removal efficiency of Cr(VI) reached 96.2%. After the CMC–LDH beads were reused 10 times, the removal efficiency of Cr(VI) still remained at 89.6%.
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高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 45
·22580-22589
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IF 9.931
Xiu-Qing Qiao,Zhen-Wei Zhang,Qiu-Hao Li,Dongfang Hou,Qichun Zhang,Jian Zhang,Dong-Sheng Li,Pingyun Feng,Xianhui Bu
Exploiting novel photocatalysts with high efficiency and durability for reduction of hexavalent chromium (Cr(VI)) has gained attention from fundamental science and industrial research. In this work, we synthesized novel two-dimensional (2D) n–n Bi2MoO6 & Bi2S3 heterojunctions by a facile in situ anion exchange process for remarkably efficient removal of Cr(VI). Results show that Bi2MoO6 & Bi2S3 heterojunctions with core–shell structures are formed through the intimate contact of Bi2MoO6 core and Bi2S3 shell. The prepared Bi2MoO6 & Bi2S3 heterojunctions exhibit unprecedented photocatalytic activity for reduction of Cr(VI) under visible light irradiation. The optimized BMO-S1 heterojunction displays the highest reduction efficiency (κapp = 0.164 min−1) for Cr(VI) reduction. To the best of our knowledge, it is one of the highest reduction rate achieved among reported photocatalysts for Cr(VI) reduction under visible-light irradiation. Detailed studies show that strong selective adsorption for Cr(VI) enhances this unprecedented photocatalytic activity. Moreover, the intimate heterojunction between Bi2MoO6 core and Bi2S3 shell can efficiently deteriorate the charge carrier recombination and Bi2S3 content can boost visible light harvesting, thereby contributing to the remarkable photocatalytic catalytic activity, which were proven by PL, EIS and transient photocurrent responses. Characterization of Mott–Schottky plots and DRS prove that the Bi2MoO6 & Bi2S3 heterojunctions established a type-II band alignment with intimate contact, accounting for the efficient transfer and separation of photogenerated carriers. This work provides a simple route for facial synthesis of heterojunction photocatalysts for Cr(VI) reduction in industrial applications.
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ChemElectroChem
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2018
·Vol. 5
·期 19
·2893-2901
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IF 4.446
Jianxia Gu,Xiangdang Yin,Xiangjie Bo,Liping Guo
Graphical With a sense of selectivity : the metal-organic framework/reduced graphene oxide composite MIL-101(Cr)/rGO is prepared via a simple hydrothermal method. The electrochemical sensor based on the composite shows low detection limits and wide linearity ranges for the determination of metronidazole, Cd 2+ and Pb 2+ , and shows excellent selectivity, reproducibility and stability. In this work, a Cr-based MOF (MIL-101(Cr))/reduced grapheme oxide(rGO) electrocatalyst was prepared through a one-pot hydrothermal method. The obtained composite was characterized via scanning electron microscopy, transmission electron microscopy, X-ray diffraction and other standard techniques. Electrochemical methods were adopted to study the electrocatalytic ability of the composite. The results imply that, compared to the single components, it exhibits higher electrocatalytic activity for the reduction of metronidazole and stripping of Cd 2+ and Pb 2+ . Optimizing the ratio of MIL-101(Cr) and rGO, an electrochemical sensor was prepared using MIL-101(Cr)/rGO-20 and used for detection of metronidazole, Cd 2+ and Pb 2+ , respectively. The linear range for metronidazole can be divided in two parts, i. e. from 0.5 to 200 μM and from 200 to 900 μM. The limit of detection is 0.24 μM (S/N=3, n=10). Likewise, it also exhibits a wide linear range from 0.05 to 6.0 μM for the detection of Cd 2+ and Pb 2+ . The corresponding detection limits are found to be 5.2 nM and 3.0 nM (S/N=3, n=10), respectively. The proposed sensor also possesses superb selectivity, reproducibility, stability and can be applied to detect real samples with desired recovery rates. In addition, the possible reduction mechanism of metronidazole and adsorption mechanism of Cd 2+ and Pb 2+ were further discussed simply in this work.
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CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Jing Zhang,Ning Gao,Fulong Chen,Tao Zhang,Guilong Zhang,Dongfang Wang,Xingyong Xie,Dongqing Cai,Xijun Ma,Lifang Wu,Zhengyan Wu
In this paper, we firstly used the inorganic nano-network of palygorskite (IPAL) with multiporous structure fabricated from rigid nano-rods by ion beam bombardment to enhance the photoactivity of the graphitic carbon nitride (CN). Results of spectroscopy techniques show that the as-prepared sample (IPAL/CN) displays broader light absorption in the visible light region and low recombination of charge carriers. Photocatalytic illustrations of Cr (VI) (and methylene blue (MB)) in aqueous solution by IPAL/CN samples were investigated respectively. Results show that the IPAL/CN-1:6 composites exhibit a superior catalytic activity with 99.5% of Cr (VI) and 99.2% of MB removal efficiency in 100 min, which were almost 7.0 times and 9.5 times higher than that of pure CN, respectively. After four cycles, the IPAL/CN-1:6 exhibits great photoactivity. Moreover, the reaction can be conducted better under the low pH value of the solution, and the initial concentration can influence the reaction property. The theory of DLVO and zeta potential were used to analyze the dispersion effect on the samples. The higher photoactivity of the IPAL/CN samples could be attributed not only to the high adsorption capacity but also to the improved dispersion affected by the nano-network of IPAL. This study provides a new opportunity for the modification of photocatalyst by the inorganic nanomaterials formed easily by physical irradiation.
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Nanomaterials
·
2018
·Vol. 8
·期 7
·537
·
IF 3.504
Haijiao Lu,Jingkang Wang,Fei Li,Xin Huang,Beiqian Tian,Hongxun Hao
Recyclable nanomaterials are in great need to develop clean technology for applications in the removal of water contaminants. In this work, easily separable montmorillonite/Fe3O4/humic acid (MFH) nanocomposites were fabricated through a facile hydrothermal route. It was found the adsorption ability and stability of MFH was significantly enhanced due to the synergistic effects between montmorillonite, Fe3O4nanoparticles and humic acid. The MFH nanocomposites are highly efficient and recyclable as they can remove at least 82.3% of Cr(VI) and 95.1% of aniline in six consecutive runs. The adsorption mechanism was investigated by analyzing the kinetic parameters of pseudo first-order, pseudo second-order, and intraparticle diffusion models and describing the equilibrium isotherms of Langmuir and Freundlich models. Results indicated different adsorption mechanisms of Cr(VI) and aniline by MFH. The readily synthesized MFH nanocomposites can act as effective and practical materials for environmental applications.Keywords:nanocomposites;wastewater;adsorption;kinetics;isotherms;reusability
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ENVIRONMENTAL POLLUTION
·
2019
·
IF 5.714
Zhe Wang,Fanyu Lin,Liqin Huang,Zhili Chang,Bing Yang,Shuang Liu,Maosheng Zheng,Yuexiang Lu,Jing Chen
As a useful heavy metal ion , chromium has seen its applications in various fields. While it is also a toxic contaminant in water and may cause serious threats to the environment and human health. To develop a novel material with good adsorption capacity and easy solid-liquid separation strategy was necessary and significant. In this paper, the β-cyclodextrin (β-CD) functionalized three-dimensional structured graphene foam (CDGF) was successfully synthesized with the facile and one-step hydrothermal method. The SEM , BET, XRD, FT-IR and XPS analysis were carried out and the results confirmed the successfully grafting of β-CD onto GF. The batch adsorption of Cr(VI) was also taken out and the CDGF possessed good selectivity compared with other metal ions at pH = 3. The adsorption capacity reduced gradually as the initial pH of the Cr(VI) solution grew higher, which was because the anionic species of Cr(VI) were partial to the positively charged surface of CDGF. The easy separation strategy of the CDGF was also demonstrated and the CDGF could be taken out easily with a tweezer after the adsorption of Cr(VI), which significantly simplified the separation procedure and reduced time. By comparing the FT-IR and XPD analysis results, the adsorption mechanism was explored and the hydroxyl groups on CDGF played the main role in the adsorption process. This work brings a novel material for the adsorption of Cr(VI) from water and provides an innovative direction for the easy and fast solid-liquid separation strategy in the adsorption and other application fields.
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CRYSTENGCOMM
·
2025
·
IF 2.6
Han Fang,Jia-Peng Han,Bo Zhang,Deng-Bo Liu,Xing-Wang Li,Jing-Yu Li,Yutong He,Mei-Hui Yu
The heavy metal ion pollution has become one of the most serious environmental problems, which promotes the continuous exploration of new materials and methods to achieve efficient detection of heavy metal ions. Luminescent metal-organic frameworks (LMOFs) featuring the designable and functional structures and tunable luminescence properties exhibit excellent potential for the recognition and detection of heavy metal ions. Herein, a Cd(II)-based luminescence MOF {[Cd2(2F-bpdc)2(tib)]}n (NKM-103) (tib=1,3,5-tris(1-imidazolyl)benzene, 2F-H2bpdc= 3,3'-difluorobiphenyl-4,4'-dicarboxylic acid) has been designed and synthesized successfully. Derived from the characteristic of ligand with conjugated units, NKM-103 shows well fluorescence emission performance and potential as a sensor for detecting both Fe(III) cations and Cr(VI) anions (Cr2O72- and CrO42-) through turn-off effect. Moreover, NKM-103 for all three kinds of ions shows low detection limit and high selectivity.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Mengjie Huang,Mengjia Zhang,Xinyu Huan,Yuanyi Li,Wei Wei,Yong Zhang
Microplastics (MPs) commonly undergo aging in various environmental media, affecting both their environmental behavior and Trojan-horse effect for contaminants. However, the mechanisms underlying the different impact of various aging processes on the Trojan-horse effect of polyamide (PA) MPs towards metal oxyanions remain unclear. This study explored how chemical aging and UV irradiation impact the structural characteristics and Cr(VI) adsorption of PA MPs under various influencing factors. Results showed that both aging processes enhanced the negative surface charge, surface oxygen content, and roughness of PA MPs, with FTIR correlation spectroscopy confirming an increase in O-containing functional groups. Cr(VI) adsorption onto aged PA sharply increased by 17.4 % (14 days of UV irradiation), 39.4 % (42 days of UV irradiation), and 21.7 % (chemical aging) compared to original PA. Salinity and natural organic matter had adverse effects on Cr(VI) adsorption. Spectroscopic analyses highlighted the crucial role of hydrophilic amide groups in controlling Cr(VI) adsorption onto aged PA, involving hydrogen bonding, electrostatic interactions, and reduction. Aged PA exhibited higher adsorption capacities but also greater desorption under simulated seawater and intestinal fluid, suggesting increased migration potential for Cr(VI). This study provides helpful insights into assessing the environmental risk of co-existing PA MPs and metal oxyanions, particularly considering the effect of aging processes.
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JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Jun Wu,Xian-Bin Wang,Raymond J. Zeng
The widespread distribution of chromium(VI) in the environment leads to groundwater contamination. The use of iron sulfide (FeS) to remove Cr(VI) has therefore been proposed. However, aggregation is one of the main problems associated with the use of FeS nanoparticles prepared by traditional methods In this study, we used sodium alginate (SA) to stabilize FeS nanoparticles (FeS-SA). SA could prevent aggregation of FeS by the concurrent electrostatic repulsion and steric hindrance. Homogeneously dispersed FeS-SA nanoparticles 100 nm in diameter were observed. FeS-SA showed high efficiency in Cr(VI) removal, corresponding to an enhancement of efficiency from 65% (7.50 mmol Cr(VI) per g FeS) to 100% (11.54 mmol Cr per g FeS) relative to that achieved with naked FeS. Analysis of reaction products by X-ray diffraction and X-ray photoelectron spectroscopy revealed the co-existence of α-FeOOH, S 8 , and Cr(OH) 3 that apparently were introduced by Fe(II), S(−II), and Cr(VI), respectively. In-depth analysis of the removal mechanism revealed that reduction and adsorption respectively account for 82% and 18% of the Cr removal. In addition, higher pH and CaCl 2 concentration resulted in lower removal efficiency. This study provides a promising application of SA in enhancing FeS reactivity for the remediation of groundwater pollution.
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JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Qi Wang,Xiaodong Shi,Enqin Liu,John C. Crittenden,Xiangjuan Ma,Yi Zhang,Yanqing Cong
AgI sensitized BiOI-Bi 2 O 3 composite (AgI/BiOI-Bi 2 O 3 ) with multi-heterojunctions was prepared using simple etching-deposition process. Different characterization techniques were performed to investigate the structural, optical and electrical properties of the as-prepared photocatalysts. It was found that the ternary AgI/BiOI-Bi 2 O 3 composite exhibited: (1) improved photocurrent response, (2) smaller band gap, (3) greatly reduced charge transfer resistance and (4) negative shift of flat band potential, which finally led to easier generation and more efficient separation of photo-generated electron-hole pairs at the hetero-interfaces. Thus, for the reduction of Cr(VI), AgI/BiOI-Bi 2 O 3 exhibited excellent photocatalytic activity under visible light irradiation at near neutral pH. AgI/BiOI-Bi 2 O 3 was optimized when the initial molar ratio of KI to Bi 2 O 3 and AgNO 3 to Bi 2 O 3 was 1:1 and 10%, respectively. The estimated k Cr(VI) on optimized AgI/BiOI-Bi 2 O 3 was about 16 times that on pure Bi 2 O 3 . Good stability was also observed in cyclic runs, indicating that the current multi-heterostructured photocatalyst is highly desirable for the remediation of Cr(VI)-containing wastewater.
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TALANTA
·
2016
·
IF 4.035
Jian-feng Guo,Dan-qun Huo,Mei Yang,Chang-jun Hou,Jun-jie Li,Huan-bao Fa,Hui-bo Luo,Ping Yang
Herein, we have developed a simple, sensitive and paper-based colorimetric sensor for the selective detection of Chromium (Ⅵ) ions (Cr (VI)). Silanization-titanium dioxide modified filter paper (STCP) was used to trap bovine serum albumin capped gold nanoparticles (BSA-Au NPs), leading to the fabrication of BSA-Au NPs decorated membrane (BSA-Au NPs/STCP). The BSA-Au NPs/STCP operated on the principle that BSA-Au NPs anchored on the STCP were gradually etched by Cr (VI) as the leaching process of gold in the presence of hydrobromic acid (HBr) and hence induced a visible color change. Under optimum conditions, the paper-based colorimetric sensor showed clear color change after reaction with Cr (VI) as well as with favorable selectivity to a variety of possible interfering counterparts. The amount-dependent colorimetric response was linearly correlated with the Cr (VI) concentrations ranging from 0.5 µM to 50.0 µM with a detection limit down to 280 nM. Moreover, the developed cost-effective colorimetric sensor has been successfully applied to real environmental samples which demonstrated the potential for field applications.
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CERAMICS INTERNATIONAL
·
2014
·
IF 2.086
Songjing Wang,Peng Li,Lianyi Shao,Kaiqiang Wu,Xiaoting Lin,Miao Shui,Nengbing Long,Dongjie Wang,Jie Shu
In this article, LiNi 0.5 Mn 1.5 O 4 and LiNi 0.4 Cr 0.15 Mn 1.45 O 4 are prepared by the tartaric acid-assisted sol–gel method. It can be found that Cr doping not only can suppress the formation of impurity phase in the final product but also can increase the cation ordering in the spinel structure. Morphology observation reveals that the introduction of tartaric acid in the preparation leads to a controlled cubic morphology and a narrow particle size distribution . It is clear that both LiNi 0.5 Mn 1.5 O 4 and LiNi 0.4 Cr 0.15 Mn 1.45 O 4 consist of octahedrons with the particle size ranging from 0.5 to 1.5 μm. Charge/discharge tests show that LiNi 0.4 Cr 0.15 Mn 1.45 O 4 can deliver a higher initial discharge capacity (143.9 mAh g −1 ) than that of undoped LiNi 0.5 Mn 1.5 O 4 (136.6 mAh g −1 ). After 40 cycles, the reversible discharge capacity of LiNi 0.4 Cr 0.15 Mn 1.45 O 4 can be still maintained at 139.7 mAh g −1 . For comparison, LiNi 0.5 Mn 1.5 O 4 only shows a reversible discharge capacity of 127.7 mAh g −1 . It suggests that Cr substitution for Ni and Mn in the spinel structure can effectively improve the electrochemical performance of LiNi 0.5 Mn 1.5 O 4.
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