SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Wei-Dong Xiao,Ling-Ping Xiao,Yi-Hui Lv,Wen-Zheng Yin,Julio Sánchez,Shang-Ru Zhai,Qing-Da An,Run-Cang Sun
Efficient removal of heavy metal ions and organic pollutants in wastewater is of great significance to healthy development of ecosystems. However, the facile preparation of novel functional materials for robust removal of both types of contaminants still remain a challenge. Herein, bifunctional composites derived from nanoscale zero-valent iron (nZVI) coated with lignin-derived carbon (LC) were fabricated via a carbothermal reduction strategy and denoted as Fe 0 @LC. This hybrid material exhibits superior performance with a maximum heavy metal removal amount of Cr(VI) as high as 575.4 mg/g from aqueous solutions. Notably, the elimination rate of Cr(VI) (100 mg/L) by Fe 0 @LC could reach up to 100% through adsorption and reduction. Furthermore, the obtained Fe 0 @LC occurs Fenton-like reactions without additional supply of H 2 O 2 toward effective degradation of organic pollutants, including 100%, 100% and 80% for methylene blue, methyl orange and congo red, respectively. The in-depth experimental and theoretical analyses reveal the synergistic effects between the catalytic Fe 0 center and the lignin-derived carbon boost the activity for catalytic degradation of organic dyes and Cr(VI) in the optimized conditions. This work not only provides critical insights into rational design, working mechanism, and application of bio-functional materials for wastewater treatment, but also achieves the goal of “treating waste with waste”.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Shihui Wang,Yuzhou Xia,Guiyang Yan,Meixia Chen,Xuxu Wang,Ling Wu,Ruowen Liang
Inspired by the concept of frustrated Lewis pairs (FLPs) from homogeneous catalysis, an organic supramolecular bridged metal-organic frameworks (MOFs) heterojunction, i.e., a perylene-3,4,9,10-tetracarboxylic diimide@MIL-125(Ti)-NH 2 (denoted PDI@MTi) composite is successfully fabricated via a two-step synthesis method. Experimental characterisations and theoretical calculations reveal that in the obtained “TiO 5−x -ligand-PDI” FLPs, the unsaturated Ti-O clusters function as a Lewis acid to accept photogenerated electrons, and the PDI sites act as a Lewis base to capture photogenerated holes. With the unique structure characteristics, the PDI@MTi shows excellent photocatalytic activity toward the disinfection of Staphylococcus aureus and Cr(VI) reduction, with 1.0- and 10.3-fold enhancements, respectively, compared with unadorned MTi. The synergic effects of the micro polarisation field, multiple active sites, and a C-N bonded interface contributed to photoactivity enhancement. This work demonstrates the potential of using MTi as a platform for constructing FLPs-containing heterogeneous photocatalysts and provides new strategies to control carrier separation.
研究领域:
材料科学
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环境科学
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生物学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Yutong Yang,Lijie Zhao,Danfeng He,Dongmei Shi,Bing Zhao,Haixia Yu,Wanxia Tang,Jianhua Zheng
Considering the potential effects of physical and chemical properties and morphology on photocatalytic performance, La doped Bi 2 WO 6 nanosheets (La/Bi 2 WO 6 -NS) were synthesized by immersion method using Na 2 WO 4 ·2 H 2 O, Bi(NO 3 ) 3 ·5 H 2 O and La(NO 3 ) 3 as raw materials. The synthesized La/Bi 2 WO 6 -NS was characterized by SEM, TEM, XPS, XRD, UV–vis, PL, I-t and EIS. The enhancement of the photocatalytic activity of La/Bi 2 WO 6 -NS in the degradation of tetracycline (TC) and reduction of chromium (VI) can be attributed to the oxygen vacancy level generated by La doping, which played a crucial role in improving the performance of Bi 2 WO 6 -NS. Moreover, the unique 2D nanosheets feature afforded abundant active sites and endowed an enhanced the visible light response, further improved photocatalytic performance. Additionally, 4 % La/Bi 2 WO 6 -NS exhibited extraordinary the simultaneously photocatalytic degradation of Cr(VI)/TC efficiency with 92.0 % and 90.8 %, which are much higher than that of single Cr(VI) and TC. Combining of the experimental confirmations and the deep DFT calculations, the synergistic photocatalytic mechanism of the synthesized material was investigated systematically.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2025
·Vol. 15
·期 1
·1-16
·
IF 3.9
Zhang Fengrong,Liu Luxing,Zhang Cuilan,Shang Dawei,Wu Lishun
A novel adsorbent ZnAl–LDHs/SiO 2 (ZA/SiO 2 ) was prepared by blending urea mixture of ZnSO 4 and Al 2 (SO 4 ) 3 while using SiO 2 as a support form. The adsorption properties of ZA/SiO 2 for the removal of toxic metal ions (Cu(II) and Cr(VI)) from water were evaluated. By batch experiment method to investigate the ZA/SiO 2 adsorption of Cu(II) and Cr(VI) solution treatment effect. The sorption kinetics curves of Cu(II) and Cr(VI) on ZA/SiO 2 were L-shaped. What’s more, the solid concentration effect was found in the process of sorption kinetics. Langmuir and Freundlich sorption isotherm models were used to analyze the adsorption data. The results showed that the adsorption conforms to Langmuir and Freundlich adsorption isotherm models. However, the adsorption capacity of ZA/SiO 2 compounds for Cu(II) and Cr(VI) is greatly improved. The adsorption capacity of Cu(II) is 158 mg·g −1 and of Cr(VI) is 176 mg·g −1 , which were 3.6 and 1.8 times of ZnAl-LDHs (ZA), respectively. Density functional theory (DFT) was utilized for the analysis of intrinsic mechanism and specific pathways. The primary mechanism for removing Cr(VI) from water mainly included the intercalation of Cr 2 O 7 2− and exchange between Cr 2 O 7 2− and OH − , excluding Cr(OH) 3 precipitation. Regarding the primary mechanism for eliminating Cu(II) from water, it involves isomorphic substitution as the predominant process, except for the formation of Cu(OH) 2 precipitates.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
·
IF 21.1
Danyan Lin,Xiujie Lin,Hao Li,Hongyuan Huang,Huan Yang,Jie Yang,Baowei Hu,Fengfeng Chen,Xinrong Guo,Xiangke Wang,Wen Yao
Herein, the ultrathin porous nitrogen-doped carbon nanosheet (uPNC-NS-800) catalyst was developed for efficient Cr(VI) reduction. Its versatile structures were obtained via thermal exfoliation of metal-organic frameworks with KCl. Impressively, uPNC-NS-800 achieved complete reduction of Cr(VI) to Cr(III) within only 6 min in oxalic acid (OA) aqueous solution, exhibiting significantly higher catalytic efficiency compared to PNC-NS-800, which lacks ultrathin structure. It also retained high catalytic activity after twelve cycles and exhibited excellent applicability, effectively removing Cr(VI) from various water environment within 30 min. Additionally, electron paramagnetic resonance spectroscopy indicated that uPNC-NS-800 promoted the generation of ·CO 2 − and ·OH radicals from OA, accelerating Cr(VI) reduction. Density functional theory calculations suggested that Defect C was the dominated active center and Pyridine N, Pyrrole N, and Graphite N were the synergistic active sites to together facilitate Cr(VI) reduction. This study provides a new insight into designing efficient carbon-based catalysts for real environmental wastewater remediation.
研究领域:
材料科学
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环境科学
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催化化学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 43
·20280-20288
·
IF 3.591
Shengli Zhang,Yanbo Pei,Menglin Li,Wei Li,Kai Su,Junmin Chen,Hongwei Yang
In the present study, a functionalized carboxymethyl cellulose-based adsorbent (PEI–PAM–CMC) was prepared via linking polyethyleneimine and polyacrylamide with carboxymethyl cellulose by epichlorohydrin. It possessed a sponge-like structure with a large number of micron-sized pores, which facilitated the mass transfer of Cr(VI). Under neutral conditions, Cr(VI) can be efficiently removed by the protonated PEI–PAM–CMC. The residual levels in the effluent were below 0.5 and 0.05 mg L−1 for 10 and 1 mg L−1 of Cr(VI), respectively. The adsorption data fitted well with the pseudo-second order kinetic model and Langmuir isotherm. Common ions including Cl−, H2PO4−, NO3−, K+, Na+, Ca2+, Mg2+ and Cr3+ had neglectable influence for Cr(VI) adsorption on the PEI–PAM–CMC except SO42−. Meanwhile, PEI–PAM–CMC showed good regeneration and reusability with a 7.5% decrease in the removal rate after ten adsorption/desorption cycles. XPS analysis and DFT calculation revealed that Cr(VI) uptake by the PEI–PAM–CMC was involved in electrostatic attraction and chemical binding. Electrostatics and induction were the main weak interaction between Cr(VI) and the adsorbent, and the major chemical adsorption sites were mainly distributed in the nitrogen groups. This research not only developed an efficient material for Cr(VI) removal but also provided a promising insight into an adsorption mechanism study.
研究领域:
环境科学
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材料科学
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理论计算
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Yangshuo Sun,Guiyang Jiang,Yiming Zhou,Leilin Shu,Jiarui Li,Longcheng Liu,Junzhe Zhang,Xunrui Cheng,Yiyun Liu,Xiaoyan Xu,Zhi Zhu,Junshan Liu,Jing Zhang,Bo Sheng,Zhengyan Wu
This study successfully employed an electric field-driven physical technique to load nanoscale zero-valent iron (NZVI) onto a polyvinylidene fluoride (PVDF) membrane, resulting in a highly dispersed and stable NZVI-PVDF composite membrane (ENP). This method avoids the generation of toxic substances and significantly suppresses NZVI aggregation and oxidation, making it highly effective for the reduction of Cr(VI) in wastewater. SEM and AFM analyses revealed that, compared to conventional loading methods, this technique effectively reduces NZVI agglomeration. The resulting NZVI particles have an average diameter of 17.29 nm, while the root mean square roughness (Sq) of the membrane surface is 127.338 nm, ensuring a higher availability of Cr(VI) reduction-active sites. Moreover, after NZVI loading, the surface contact angle of the PVDF membrane decreased from 77.4° to 63.1°, indicating enhanced hydrophilicity. Cr(VI) reduction experimental results indicate that under optimal conditions with an applied voltage of 6 kV, pH 2, temperature of 25 °C, and atmospheric pressure, the ENP membrane achieved a Cr(VI) removal efficiency of 99.8 % within 1 h for an initial Cr(VI) concentration of 100 mg/L. These findings demonstrate that the electric field-driven NZVI loading approach will provide a promising, cost-effective, and environmentally friendly strategy for industrial wastewater treatment. It effectively overcomes the issue of NZVI aggregation while expanding its practical applications in water treatment technologies.
研究领域:
环境科学
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材料科学
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水处理技术
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
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.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Qinzhi Wang,Zhan Shi,Zhi Wang,Yijian Zhao,Jianuo Li,Huifan Hu,Yaowen Bai,Zhihao Xu,Hui Zhangsun,Li Wang
Acid orange II (AO II), a typical azo pigment, is strictly controlled by legislation and prohibited in foodstuffs. Herein, we prepared gold nanoparticles decorated amino-functionalized Cr-based metal-organic frameworks [NH 2 -MIL-101(Cr)@Au] via an in-situ reduction method as a surface-enhanced Raman scattering (SERS) substrate for simultaneous adsorption and detection of AO II. Gold nanoparticles are uniformly dispersed on the surface of NH 2 -MIL-101(Cr) owing to its three-dimensional (3D) structure and the interaction between –NH 2 and Au ions , providing more SERS-active “hot spots”. These NH 2 -MIL-101(Cr)@Au nanocomposites exhibited selective and high adsorption performance (419.85 mg g −1 ) for AO II, and could be used as superior SERS substrates for the detection of AO II with a low limit of detection (LOD) of 0.05 mg L −1 and wide detection range of 0.05–50 mg L −1 using portable Raman spectrometer. Furthermore, this SERS assay has been successfully used to determine AO II in orange juice and chili powder with good sensitivities.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 6
·065902
·
IF 1.449
Liguang Xiao,Xiaotong Zhang,Gang Yan
The Cr(VI) is a acute toxic and bioaccumulated pollutant in wastewater, the removal of these contaminants is particularly significant. Semiconductor photocatalysis is an effective method to reduce the Cr(VI) in the wastewater. In this paper, diatomite/Bi2S3 composite photocatalysts are synthesized by a facile in suit hydrothermal vulcanization method using bismuth nitrate and thiourea as precursors and diatomite as supporting materials. The structural information, morphologies, chemical states and optical properties of the composite are characterized by XRD, SEM, XPS and DRS. Under visible light irradiation (λ > 400 nm), the diatomite/Bi2S3 composite exhibit better photocatalytic reduction activity of Cr(VI) than the pristine Bi2S3. The photocatalytic mechanism is further investigated by the active species capturing tests and photoelectrochemical measurements.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2024
·
IF 2.7
Taohong Zhou,Jin Lin,Fengmei Jin,Yanxing Yao,Zhihao Li,Lihua Wang
Cr(VI) is one of the most typical heavy metal contaminants and rapid detection of Cr(VI) is highly important in food control and public health. Herein, a core–shell Au@Pt nanozyme-based colorimetric assay was developed for the rapid and sensitive detection of Cr(VI). The monodispersed Au@Pt core–shell nanoparticles exhibited high peroxidase-mimicking activity and can catalyze colorless TMB into blue-colored oxidized oxTMB. After the addition of Cr(VI), the oxTMB molecules can be reduced into colorless TMB. The ultrathin Pt shell can prevent the Pt component from aggregation, thus improving the catalytic activity of Au@Pt nanozyme. These Au@Pt nanozyme-based Cr(VI) assays exhibited high sensitivity and selectivity and displayed satisfactory recoveries in practical samples. Our work highlights opportunities for the development of core–shell nanozymes with extensive applications in food safety, biomedicine, and environmental monitoring.
研究领域:
纳米材料
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Yuxin Liu,Qintie Lin,Jieyi Pan,Yirong Deng,Junli Zheng,Mingchao Lyu,Hao Luo,Yang Luo
The existing remediation technologies for Cr(VI) contamination soil suffer from long processing times. Microwave catalysis is an efficient environmental remediation technology, and the reasonable design of microwave catalysts can enable a microwave catalytic system to rapidly complete the remediation of Cr(VI). In this study, a microwave catalyst, NRFC-3, with high microwave absorption performance and electron density was designed via a nitrogen enrichment strategy. Density functional theory (DFT) calculations verified that the electron density of the material was increased by nitrogen-enriched strategy. Under the experimental conditions, the electrons (e − ) of NRFC-3 originate from “hot spots” and the current density is not lower than 3.78 × 10 9 e·g −1 ·s −1 . In addition, the reduction of Cr(VI) in the MW/NRFC-3 system is feasible through DFT predictions, and this conclusion was experimentally verified. The MW/NRFC-3 system has a remediation efficiency of 100 % for Cr(VI)-contaminated soil within 25 min, significantly reduced the toxicity of Cr(VI) to the environment and humans, and had long-term stability. The potential application of the MW/NRFC-3 system was verified by remediation experiments on Cr(VI)-contaminated soils of different degrees. This study provides a new technology for the rapid and harmless treatment of Cr(VI)-contaminated soil.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）