JOURNAL OF HAZARDOUS MATERIALS
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2016
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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
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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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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
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IF 3.8
Douhao Yang,Ruiting Jian,Jianjun Yan,Ao Zhang,Bowen Liu,Zhongwei Liu
Defect engineering has a great effect on the properties of metal–organic frameworks (MOFs). In this study, the defective UiO-66-NH2 MOFs are successfully prepared by a rapid Ar plasma modification method. At certain experimental conditions (15 W radio frequency input power, 20 Pa working pressure, and 120 s Ar plasma modification time), the afforded UiO-66-NH2 shows significant enhancement in photocatalytic reduction of Cr(VI), and a maximum reduction efficiency of 68.5% is obtained. Advanced characterizations show that the plasma treatment generates missing-linker defects within the UiO-66-NH2 structure, which can enhance the separation of photogenerated electrons and holes and improve the photoreduction capability. The findings not only contribute to a better understanding of the relationship between the structure and performance of MOFs but also provide a simple approach for defect engineering of MOFs.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Chen Wang,Xiaohui Wu,Mingjie Huang,Tao Zhou,Juan Mao,Xiangling Zhang
Treatment of Cr(VI)-contaminated wastewaters by conventional reduction methods has been intensively challenged by alkaline environments. In this study, a novel copper-iron oxide composite (Cit@CuFeO) enriched with oxygen vacancies (OVs) was developed by ball milling with citric acid ligand (Cit). The material demonstrated efficient Cr(VI) removal within a broad pH range (6.0–12.0). Intriguingly, simultaneous and nearly complete in-situ immobilization of Cr(III) occurred, instead of precipitated in strong alkaline circumstances. Characterizations of the Cit@CuFeO revealed that ball milling of Cit could introduce abundant OVs into the oxide structure, serving as pivotal active sites linearly correlated with Cr(VI) capture and removal. These generated OVs could also boost electron conduction in Cit@CuFeO and cause a positive shift in the zeta potential , thereby enabling the adsorption of negative CrO 4 2- at high pH. Furthermore, DFT calculation verified that the surface-attached Cit would significantly decrease the adsorption energy of Cr(VI) at OVs sites, competitively excluding the occupancy of common inorganic anions especially CO 3 2– and thus favoring the Cr(III) immobilization under alkaline conditions. This study has provided a green functional material for the one-step remediation of alkaline Cr(VI) wastewaters without the need for acidification.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Bing Hou,Xinyu Yang,Ling Wang,Tao Shi,Muhammad Akram,Lei Wang,Jun Wan,Baoyu Gao,Jingwen Pan
Cerium-based adsorbents possessed unique advantages of valence variability and abundant oxygen vacancies in hexavalent chromium (Cr(VI)) adsorption, but high cost and unstable properties restricted their application in Cr(VI) contained wastewater treatment. Herein, a series of bimetallic adsorbents with different cerium/iron ratios (CeFe@C) were prepared by adding inexpensive Fe into Ce-based adsorbents (Ce@C), and the effect of Fe doping on adsorption properties of Ce@C for Cr(VI) was investigated thoroughly. Compared with pristine Ce@C, CeFe@C exhibited excellent removal performance for Cr(VI), and the improved maximum adsorption capacity reached 75.11 mg/g at 25℃. Benefiting from Fe doping, CeFe@C had good regeneration property, with only 25 % decrease after five adsorption–desorption cycles. Contents of trivalent cerium (Ce(III)) and oxygen vacancies (O v ) in bimetallic adsorbents were positively correlated with divalent iron (Fe(II)) doping, indicating that the formation of Ce(III) and surface defects on Ce@C could be effectively regulated by Fe doping. Density functional theory (DFT) calculation results further proved that the doped Fe enhanced the electron transfer effectively and lowered the energy barriers of Cr(VI) adsorption onto Ce@C surface, strengthening the reduction and complexation to Cr(VI). This study provides new insights for improving the Cr(VI) removal performance by modified Ce-based adsorbents, and further promotes the utilization potentiality of low-cost and low-toxicity Ce-based adsorbents in Cr(VI)-containing wastewater treatment.
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INORGANIC CHEMISTRY
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2025
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IF 4.7
Longying Duan,Ting Cheng,Yanyue Zhu,Yuping Wang,Yanxin Gao,Jinhong Bi
Environmental concerns are driving the development of eco-friendly and effective methods for contaminant monitoring and remediation. In this study, a lanthanide porphyrin-based MOF with dual fluorescence sensing and photocatalytic properties was synthesized and applied for the detection and combined removal of Cr(VI) and ciprofloxacin (CIP). Using different excitation wavelengths, the material exhibited selective detection of Cr(VI) via fluorescence quenching and CIP through fluorescence enhancement. The variation in color intensity of Tb-MOF on 3D EEM spectra enabled simultaneous detection of both contaminants. Additionally, Tb-MOF demonstrated a synergistic removal effect, achieving over 95% removal rates of Cr(VI) and CIP within 90 min, with consistent sensing and catalytic performance across four cycles. Mechanistic investigations revealed that (i) strong coordination between Tb3+ and CIP altered the surface potential of Tb-MOF, enhancing Cr(VI) adsorption; (ii) as an efficient electron acceptor, Cr(VI) promoted electron transfer and its reduction to Cr(III); and (iii) superoxide radicals generated via a type I mechanism played a key role in CIP degradation. This research underscores the potential of Tb-MOF as a multifunctional platform for simultaneous detection and synergistic remediation of mixed pollutants.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 19
·28695-28705
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IF 0
Liu Hongyu,Ye Wei,Zhang Huan,Wang Huicai,Wei Junfu
Here, polyaniline/polyvinylidene fluoride (PANI/PVDF) nanofiber composite membrane was fabricated using electrostatic spinning technology to remove hexavalent chromium Cr(VI). The employment of PANI not only extremely enhanced the hydrophilic property of the nanofiber membrane, but also facilitated the transfer of Cr 2 O 7 2− from water to the membrane. The PANI/PVDF membrane had an extremely excellent performance in getting rid of Cr(VI) and a quite large flux (250 L/m 2 h). The maximum adsorption quantity of the membrane could reach 334.5 mg/g in which adsorption played 52.12% part and reduction played 47.87% part. The removal rate could reach nearly 100% immediately in the permeate solution under filtration while it needed 240 min to reach 100% only by static adsorption. Therefore, the interception of the membrane and the adsorption reduction of PANI had synergistic effect on removal of Cr(VI). Furthermore, the removal rate of Cr(VI) could still reach 95.97% after reused 8 times. The membrane showed a very good reusability and application prospect. Graphical Abstract
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
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IF 4.3
Yi Gu,Yang Jiao,Ya Ruan,Jing Yang,Yaling Yang
Herein, a nanocomposite of Cu,Ce-containing phosphotungstates (Cu,Ce-PTs) with outstanding laccase-like activity was fabricated via a one-pot microwave-assisted hydrothermal method. Notably, it was discovered that both Fe 3+ and Cr 6+ could significantly enhance the electron transfer rates of Ce 3+ and Ce 4+ , along with generous Cu 2+ with high catalytic activity, thereby promoting the laccase-like activity of Cu,Ce-PTs. The proposed system can be used for the detection of Fe 3+ and Cr 6+ in a range of 0.667–333.33 μg/mL and 0.033–33.33 μg/mL with a low detection limit of 0.135 μg/mL and 0.0288 μg/mL, respectively. The proposed assay exhibits excellent reusability and selectivity and can be used in traditional Chinese medicine samples analysis.
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DIAMOND AND RELATED MATERIALS
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2024
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IF 4.3
Tao Chen,Luzhao Xing,Shaojun Niu
Here, a novel magnetic nitrogen-rich biochar (MNRB), synthesized by attaching Fe 3 O 4 @SiO 2 -NH 2 particles with core-shell structure on crab shell derived/nitrogen-rich biochar (NRB), was used as absorbent and reductant to remove hexavalent chromium in aqueous systems. Characteristics of the material demonstrated that the MNRB was rich in nitrogen-containing functional groups and that the Fe 3 O 4 @SiO 2 -NH 2 magnetic particles with a diameter of approximately 150 nm were successfully added on the MNRB surface by strong ether linking (C-O-C). The maximum removal capacity of MNRB was 152.9 mg·g −1 , which was considerably higher than most reported magnetic biochar. Study of the removal mechanisms revealed that the Cr(VI) removal by MNRB involved three steps: (1) adsorption of Cr(VI) anions by protonated functional groups; (2) reduction of Cr(VI) anions to Cr(III) cations by electron-donor groups; and (3) chelation of Cr(III) cations by amine groups. The easy regeneration, satisfactory reusability, and remarkable performance in batch tests reflected the high potential of MNRB for treating Cr(VI)-contaminated water.
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Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Mengyuan Huang,Yuanyuan Yang,Hui Cao,Min Yuan,Tai Ye,Liling Hao,Jinsong Yu,Fengqin Yin,Fei Xu,Xiuxiu Wu
Cr(VI) is a representative heavy metal which has significant toxicity to biological organisms. Ion-imprinted polymers (IIPs) have been recognized as effective adsorbents to remove Cr(VI) from environment. Among them, imidazole derivatives are expected to serve as potential monomers for Cr(VI)-IIPs, but the binding mechanisms of monomers with Cr(VI) remain unclear, which makes Cr(VI)-IIPs design having rare sound theory to be guideline. In this work, the suitable functional monomer of Cr 2 O 7 2- -IIPs was screened among five imidazole derivatives (adenine, cytosine, uric acid, l-histidine, 1-methacryloyl imidazole) with a target-monomer binding affinity guide strategy, and the optimal self-assembling conditions were investigated using theoretical calculations and experimental methods. Adenine exhibited the highest potential among the five candidate monomers, followed by cytosine. The optimal ratio of target and monomer was determined to be 2:3. Furthermore, a 5:5 mixture of ethanol and cyclohexane was identified as the most suitable solvent for the pre-polymerization environment, while epichlorohydrin acted as the most appropriate crosslinker. Additionally, the binding nature of non-covalent interaction between target and monomer was identified to be electrostatic-dominated hydrogen bonding. These mechanistic insights provide valuable theoretical support for the rational design of Cr 2 O 7 2- -IIPs, which are significant for IIPs development as adsorbents for contaminants detection and removal from environment.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Min Zhang,Mingxuan Du,Yuhang Ren,Yun Zhu,Yunyuan Dong,Jianming Liao,Xiaobin Chen,Qifu Zheng,Hongfei Yin
Element doping is generally employed to modify photocatalysts by optimizing their electronic structure, and light absorption , as well as improving charge separation and transfer, which are key factors in photocatalysis . In this study, a simple one-step solvothermal route was employed to synthesize N, O co-doped ZnIn 2 S 4 . Systematical analyses demonstrate that the introduction of N and O co-doping leads to enhanced light absorption, increased specific surface areas , and improved charge separation and transfer in comparison to the unmodified ZnIn 2 S 4 . As expected, compared with bare ZnIn 2 S 4 , the as-prepared N, O co-doped ZnIn 2 S 4 exhibits superior photocatalytic H 2 evolution and Cr(VI) photoreduction performance. The H 2 evolution rate of the N, O co-doped ZnIn 2 S 4 reaches 2254.0 μmol g −1 h −1 , which is 2.8 times of pristine ZnIn 2 S 4 . Moreover, the Cr(VI) photoreduction efficiency reaches 99.5 % within 50 minutes, and the apparent kinetic constant is nearly 4 times the bare ZnIn 2 S 4 . This work contributes to the modification of ZnIn 2 S 4 for photocatalytic H 2 generation and Cr(VI) reduction.
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Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Wen Sun,Rui Wang,Lingfei Li,Jun Zhao,Bianhua Liu
To combat the increasingly serious water pollution caused by heavy metal ions , the development of efficient adsorbents is of great significance. In this study, a novel composite adsorbent for Cr(VI) removal was smartly designed using environmentally friendly materials such as tannic acid (TA) and polyethyleneimine (PEI) for surface modification of g-C 3 N 4 nanosheets through covalent assembly of polyphenols and amines. The obtained (PEI-TA)-g-C 3 N 4 composite was capable of efficiently and quickly adsorbing Cr(VI) in water, with a maximum adsorption capacity of 769.23 mg/g at 308 K (35 °C), which was much higher than most reported Cr(VI) adsorbents. Notably, (PEI-TA)-g-C 3 N 4 could reduce highly toxic Cr(VI) to low toxic Cr(III) and effectively adsorb it. The Cr(VI) adsorption process was a spontaneous thermal adsorption process that conformed to the pseudo-second-order kinetic model and Langmuir isotherm model. In addition, the excellent photothermal performance of (PEI-TA)-g-C 3 N 4 further accelerated the adsorption of Cr(VI). Moreover, the strong anti-interference ability of (PEI-TA)-g-C 3 N 4 composite against anions and other metal ions enabled it to effectively remove Cr(VI) in complex environments, expanding its practical application scenarios. The polymer coatings rich in phenolic hydroxyl- and amine-rich formed on the large surface area of g-C 3 N 4 and the protonation of the amino groups are the keys for (PEI-TA)-g-C 3 N 4 composite to have ultra-high adsorption performance and strong anti-interference ability towards Cr(VI). The designed strategy of this metal-free and environmentally friendly composite with ultra-high removal of Cr(VI) capability from wastewater provides new ideas for developing green, inexpensive, and efficient adsorbents.
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