APPLIED ORGANOMETALLIC CHEMISTRY
·
2024
·Vol. 38
·期 9
·e7614
·
IF 3.7
Qiuyun Zhang,Feiran Xie,Jialu Wang,Tianqing Wang,Jiao Lei,Weihua Li,Jingsong Cheng,Yutao Zhang
For nearly a century, the excessive discharge of organic contaminants has gradually polluted water and endangered people's health, and photocatalysis has been prominently employed to remove persistent recalcitrant organic. Here, MIL-101(Cr) was firstly employed to introduce thin-layered Bi 2 O 2 CO 3 for the formation of Bi 2 O 2 CO 3 /MIL-101(Cr) nanosheet composite, by a simple and low-temperature in-situ growth approach. The phase, morphology, optical, and surface characteristics of the fabricated composite were characterized through XRD, FTIR, SEM-EDS, N 2 adsorption–desorption, UV–Vis DRS, PL, TG, and XPS techniques, and the ability in the photocatalytic breakdown of rhodamine B (RhB) molecule under visible light was also studied. The results of characterization analysis and optical analysis exhibited that Bi 2 O 2 CO 3 /MIL-101(Cr) has large pore size, good visible light response-ability, and the heterojunction created by intercalating Bi 2 O 2 CO 3 on MIL-101(Cr). Photocatalytic studies revealed that Bi 2 O 2 CO 3 /MIL-101(Cr) had superior RhB degradation activity than pure MIL-101(Cr) and Bi 2 O 2 CO 3 , which achieved 97.1% with visible light irradiation for 20 mg/l RhB. Meanwhile, the Bi 2 O 2 CO 3 /MIL-101(Cr) composite displayed good recyclability after three cycles as revealed by XRD and FTIR analysis proving their excellent stability. This study provides feasible insight into developing novel and efficient MIL-101-based heterojunction catalysts for environmental remediation in the future.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 3
·e70037
·
IF 0
Qiuyun Zhang,Maozhen He,Jialu Wang,Shijian He,Mei Deng,Yanhui Lei,Xiaojuan Zhang,Jingsong Cheng,Zhengjun Liu,Yutao Zhang
The construction and optimization of an effective photocatalyst for photodegradation of persistent recalcitrant organic remains challenging. In this work, MIL-101(Cr)-based nanocomposites (AgI@MCr) are proposed to be fabricated by a simple, green solvent, and room temperature in situ preparation strategy, achieving a highly efficient photocatalytic degradation of organic dye rhodamine B (RhB) molecule under visible light irradiation. Extensive characterization (XRD, FTIR, N 2 adsorption–desorption, SEM and EDS, TG, XPS, UV–vis DRS, PL, transient photocurrent, and EIS) confirmed the composite material's structure, morphology, elemental composition, and optical characteristics. Among all the prepared nanocomposites, AgI@MCr-2 demonstrates outstanding photocatalytic performance for RhB with a removal efficiency of 95.4% within 70 min, and a reaction kinetics of 0.0392 min −1 , superior to pristine AgI or MIL-101(Cr), and also shows excellent durability, retaining over 80% RhB degradation efficiency after four cycles. Remarkably, the significant enhancement is attributed to the built interfacial contact and synergistic effect between substances in the nanocomposite, high specific surface area, strong visible light–harvesting capacity, low bandgaps, and high electron–hole pair separation. In addition, a possible degradation route for the AgI@MCr nanocomposite is further proposed using various analysis techniques. This study provides valuable references for developing effective multicomponent MOF-based photocatalytic composite materials for dyeing wastewater treatment and environmental remediation.
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MATERIALS LETTERS
·
2018
·
IF 2.687
Xiu Yang,Ying Zhang,Yongcai Zhang,Tianxiao Peng,Aiping Zhu
Conjugated derivative (CPVC) from thermal dehydrochlorination of polyvinyl chloride (PVC) was tried to modify SnO 2 nanoparticles for developing a high efficiency visible-light-activated photocatalyst for the treatment of Cr(VI) wastewaters. CPVC modified SnO 2 nanoparticles (SnO 2 /CPVC) were synthesized via the following procedures: (i) mixing of SnO 2 nanoparticles and PVC in tetrahydrofuran solution, then evaporation of tetrahydrofuran to produce SnO 2 /PVC nanocomposite, and (ii) thermal treatment of the SnO 2 /PVC nanocomposite at 150 °C for 2 h to transform its PVC into conjugated CPVC. The as-synthesized products were characterized using X-ray diffraction, Raman spectroscopy, high resolution transmission electron microscopy, UV–vis diffuse reflectance spectra, transient photocurrent measurement, and electrochemical impedance spectroscopy. The photocatalytic tests indicated that SnO 2 /CPVC nanocomposite had exceptionally higher (about 14 times) photocatalytic activity than SnO 2 nanoparticles in the reduction of aqueous Cr(VI) under visible-light (λ > 420 nm) irradiation. This work is the first report of SnO 2 /CPVC as photocatalyst for the reduction of Cr(VI), and also useful for developing new efficient visible-light-activated photocatalysts using low cost polyvinyl chloride.
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WATER SCIENCE AND TECHNOLOGY
·
2024
·Vol. 89
·期 9
·2384-2395
·
IF 2.5
Bing Wenrong,Li Xinyu,Liang Mingzhao,Zhou Xu,Zhang Jianfeng,Liang Jing
View large Download slide View large Download slide Close modal Cr(VI) and phenol commonly coexist in wastewater, posing a great threat to the environment and human health. However, it is still a challenge for microorganisms to degrade phenol under high Cr(VI) stress. In this study, the phenol-degrading strain Bacillus cereus ZWB3 was co-cultured with the Cr(VI)-reducing strain Bacillus licheniformis MZ-1 to enhance phenol biodegradation under Cr(Ⅵ) stress. Compared with phenol-degrading strain ZWB3, which has weak tolerance to Cr(Ⅵ), and Cr(Ⅵ)-reducing strain MZ-1, which has no phenol-degrading ability, the co-culture of two strains could significantly increase the degraded rate and capacity of phenol. In addition, the co-cultured strains exhibited phenol degradation ability over a wide pH range (7–10). The reduced content of intracellular proteins and polysaccharides produced by the co-cultured strains contributed to the enhancement of phenol degradation and Cr(Ⅵ) tolerance. The determination coefficients R 2 , RMSE, and MAPE showed that the BP-ANN model could predict the degradation of phenol under various conditions, which saved time and economic cost. The metabolic pathway of microbial degradation of phenol was deduced by metabolic analysis. This study provides a valuable strategy for wastewater treatment containing Cr(Ⅵ) and phenol. Co-culture can degrade phenol under high concentrations of Cr(VI). Co-culture improves the degraded rate and concentration of phenol under Cr(VI) stress. Co-culture synergistically enhances the ability to resist phenol and Cr(VI) toxicity. BP-ANN predicted the degradation of phenol under different conditions.
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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.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Jisuan Tan,Yuxin Xu,Qin Deng,Yingmei Li,Yanzhen Yin,Xingtang Liang,Yong Luo
This study investigated the transformation of an agricultural byproduct, pomelo peel, into an environmental purifier by crosslinking assisted surface amination process and its use in wastewater treatment application. Surface morphology and textural analysis showed that the functionalized surface-amidated pomelo peel (SA-PP) attained a lamellar structure with an average pore size of 6.52 nm and a specific surface area of 7.82 m² g −1 . Zeta potential measurements confirmed that SA-PP exhibits a positive surface charge within a pH range of 3–11. This surface characteristic facilitated the effective adsorption of anionic dyes by SA-PP, including amaranth red ( Q e = 497.15 mg g −1 ), methyl orange ( Q e = 247.93 mg g −1 ), bright blue ( Q e = 231.53 mg g −1 ), and lemon yellow ( Q e = 116.77 mg g −1 ), as well as heavy metal ions like hexavalent chromium (Cr(VI), Q e = 193.17 mg g −1 ). Further investigations on the adsorption of amaranth red and Cr(VI) indicated that SA-PP achieved equilibrium after 30 min. The process followed the pseudo-second-order and Langmuir isotherm models, indicating monolayer adsorption. The adsorption efficacy of SA-PP remained consistent across a wide range of pH levels. After five cycles, SA-PP was able to retain more than 60 % of its adsorption capacity, highlighting its potential as a sustainable, cost-effective, non-toxic, and biodegradable adsorbent for wastewater treatment applications.
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ACS Applied Bio Materials
·
2024
·
IF 4.6
Xingli Ding,Li Sheng,Jianming Zhang,Ge Zhang,Qi Gu,Yu Li,Long Zhang,Min Ji
Portable fluorescent film sensors offer a solution to the contamination issue in homogeneous sensor detection systems. However, their special structure leads to low sensitivity and a long response time, resulting in a significant scientific challenge limiting their development and application. In this work, we propose a dual design strategy to prepare highly sensitive film sensors for rapidly detecting Cr2O72–. Specifically, P(Fmoc-Osu)-SA hydrogel films were developed by integrating the biological macromolecule sodium alginate (SA) with the conjugated polymer poly(N-(9-Fluorenylmethoxycarbonyloxy)succinimide) (P(Fmoc-Osu)), using both mold and inkjet 3D printing methods. The “molecular wire effect” of the sensing unit P(Fmoc-Osu) and the water channel within the film substrate are responsible for the improved sensitivity and the reduced response time of this thin film sensor. P(Fmoc-Osu)-SA hydrogel films prepared by these two methods can rapidly detect Cr2O72– with limits of detection of 1.18 and 0.078 nM, respectively. Considering that 3D-printed hydrogel films can be tailored to different shapes according to detection needs, the P(Fmoc-Osu)-SA hydrogel films produced from this method were effectively applied in vegetable samples. This study provides an innovative and effective strategy for the development of biocompatible hydrogel sensors that offer the potential for determining trace amounts of Cr2O72– in agriculture.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Jinlong Wang,Shengqiang Song,Hang Liu,Ao Huang,Yunfei Wang,Mithun Nath
In the study, the solid solubility limits of Cr 3+ in the CaAl 12-x Cr x O 19 phase and leachability of any Cr 6+ safety were investigated. Analytical tools and leaching experiments were used to investigate the Al 3+ substitution in hibonite (CaAl 12 O 19 ) structure by Cr 3+ . The results showed that at Al:Cr=9:3, all the generated phases were chrome-hibonite (Ca 1.06 Cr 2.87 Al 9.07 O 18.99 ) and were also supported by the XPS and Cr 6+ leaching experiments results. However, when proportion of Cr in system increases to Al:Cr=7:5, the primary phases are Ca 1.09 Cr 3.92 Al 8.01 O 18.98 and alumina-chrome solid solution (Al 0.77 Cr 1.22 O 3 ) along with a small amount of wuboraite solid-solution (CaAl 2±x Cr 2±x O 7 , a Cr 3+ phase) and chrome-hauyne (Ca 4 Al 6 CrO 16 , a Cr 6+ phase). At Al:Cr=7:5, distilled water and 0.1 mol/L HCl leach around 1.9 mg/L Cr 6+ , but HCl showed relatively faster leaching of Cr 6+ than water and below the Chinese national standard of waste disposal of 3 mg/L. The maximum solid-solubility limit of Cr 3+ in CaAl 12-x Cr x O 19 could be considered as x =3.9.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 28
·41032-41045
·
IF 0
Sun Ying,Wang Zexu,Zhang Shijie,Liu Chuyin,Xu Yunfeng
The problem of soil and water contamination caused by Cr(VI) discharged from the dyeing, electroplating, and metallurgical industries is becoming increasingly serious, posing a potentially great threat to the environment and public health. Therefore, it is crucial to develop a fast, efficient, and cost-effective adsorbent for remediating Cr-contaminated wastewater. In this work, MgAl-LDH/commercial-activated carbon nanocomposites (LDH-CACs) are prepared with hydrothermal. The effects of preparation and reaction conditions on the composite properties are first investigated, and then its adsorption behavior is thoroughly explored. Finally, a potential adsorption mechanism is proposed by several characterizations like SEM–EDS, XRD, FTIR, and XPS. The removal of Cr(VI) reaches 72.47% at optimal conditions, and the adsorption study demonstrates that LDH-CAC@1 has an extremely rapid adsorption rate and a maximum adsorption capacity of 116.7 mg/g. The primary removal mechanisms include adsorption-coupled reduction, ion exchange, surface precipitation, and electrostatic attraction. The reusability experiment illustrates that LDH-CAC@1 exhibits promising reusability. This study provides an effective adsorbent with a remarkably fast reaction, which has positive environmental significance for the treatment of Cr(VI) wastewater.
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PubMed
MOLECULES
·
2024
·Vol. 29
·期 14
·3417
·
IF 4.2
Pengfei Zhu,Zhaoxia Hu,Shouwen Chen
The development of economical catalysts that exhibit both high activity and durability for chlorinated volatile organic compounds (CVOCs) elimination remains a challenge. The oxidizing and acidic sites play a crucial role in the oxidation process of CVOCs; herein, praseodymium (Pr) was introduced into CrOx catalysts via in situ pyrolysis of MIL-101(Cr). With the decomposition of the ligand, a mixed micro-mesoporous structure was formed within the M-Cr catalyst, thereby reducing the contact resistance between catalyst active sites and the 1,2-dichloroethane molecule. Moreover, the synergistic interaction between chromium and praseodymium facilitates Oβspecies and acidic sites, significantly enhancing the low-temperature catalytic performance and durability of the M-PrCr catalyst for 1,2-dichloroethane (1,2-DCE) oxidation. The M-30PrCr catalyst possess enhanced active oxygen sites and acid sites, thereby exhibiting the highest catalytic activity and stability. This study may provide a novel and promising strategy for practical applications in the elimination of 1,2-DCE.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xikun Zhang,Yang Su,He Zhang,Yukai Wang,Yu Chang,Shurui Yi,Junzheng Chen,Di Fang,Xue Lv,Lu Liu
A novel composite hydrogel prepared from polyacrylamide (PAM), polydopamine-modified montmorillonite (PDA@MMT), graphene and hydroxypropyl cellulose (HPC), loaded with Ag NPs, was prepared for the catalytic degradation of methylene blue (MB) and Congo red (CR) using in situ reduction. HPC significantly enhanced the dispersion of PDA@MMT within the hydrogel, endowing the hydrogel with excellent mechanical properties, with stress and strain of 1773 kPa and 4005 %, and elastic modulus and toughness of 43.4 kPa and 29.54 MJ/m 3 , respectively. The introduction of graphene (GN) increased the rate of electron transfer during the catalytic process and significantly improved the catalytic efficiency, with catalytic rate constants of 1.360 and 0.803 min −1 for MB and CR at 20 °C, respectively. The hydrogels were endowed with excellent antimicrobial properties due to the introduction of Ag NPs. In the future, this hydrogel is expected to play an important role in environmental pollution control.
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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.
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