JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Jing Liang,Xinyu Li,Yujing Zheng,Yingnan Pang,Yunxing Zhao,Yao Wang,Jiejing Zhang,Jianfeng Zhang
Advanced reduction processes (ARPs) have become hotspot because of their fast and efficient features in pollutant treatment. In this study, a novel ARP was raised through the assistance of biological wastewater degradation solutions (PDs), to completely reduce Cr(VI). Enterobacter cloacae YN-4, which could completely degrade 1500 mg/L phenol within 72 h, was isolated and identified. While, the content of organic acids and their derivatives in PDs was extremely high (74.76 %). After the combination of PDs with Fe(III) and UV, 10 mg/L Cr(VI) was completely reduced within 66 min, whose reduction rate of Cr(VI) was stable at various concentrations (10–100 mg/L), which was applicable on electroplating wastewater. In addition, Cr(VI) could be reduced stably (71.63 %) after 10 cycles. Compared with the reported ARPs, herein, the components was complex, which was firstly proposed that simultaneous action of polycarboxylic acids, monocarboxylic acids, amino acids and alcohols could promote and ensure the stable reduction of Cr(VI). Among them, the multispecies radicals·CO 2 - and·O 2- generated in PDs were combined with Fe(II), to co-reduce Cr(VI). This strategy produces a wide variety of radicals, which can provide an alternative pathway for remediation of various heavy metals and organic pollutants.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Junlong Cai,Bin Liu,Fazhi Xie,Xin Mao,Bing Zhang
Cr(VI) in chromium-containing industrial wastewater, which is highly toxic and difficult to degrade, brings great challenges to the treatment of industrial wastewater. However, conventional chromium removal methods suffer from low efficiency and secondary contamination. This study demonstrates that the micelle-enhanced nanofiltration (MENF) process is an effective strategy for the removal of Cr(VI). Micelles generated from two commonly used cationic surfactants (cetyltrimethylammonium bromide (CTAB) and cetyltrimethylammonium chloride (CTAC)) were capable of complexing with Cr(VI), resulting in the formation of aggregates with larger hydrodynamic diameters that were effectively retained by the membrane. The results showed that CTAC had a greater performance in removing Cr(VI) compared to CTAB, and the removal rate can reach 98.55 % at an initial concentration of 100 ppm. Meanwhile, the retention rate of surfactant under each condition was more than 96.23 %, which effectively reduced the generation of secondary pollution. Even in the presence of interfering anions, Cr(VI) still had a high affinity for cationic surfactant micelles. In addition, concentration polarization and micelles deposition acted as the main fouling potential during MENF process. This study provides a new insight into technological innovation and environmental protection in the field of wastewater treatment.
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MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Yi Tian,Yunlong Yue
To improve the photoluminescence (PL) and increase photostability of carbon dots (CDs), phosphorus doped CDs with bright green emitting were prepared using (NH 4 ) 2 HPO 4 and m-phenylenediamine (MPD), and terephthalic acid (TA) via a solvothermal synthesis. Compared to undoped CDs (M−CDs), the PL efficiency of P-doped sample (M−6 %P-CDs) created using optimized conditions was improved from 55.1 to 73.9 %. These bright CDs were incorporated in films to test the stability, in which the photostability in liquid and polymer films were improved by 6 and 37 %, respectively. Namely, it is found that P affected the functional groups of on the surface and inside CDs. Phosphorus promoted the dehydration condensation reaction of precursors, increased the structural defects of the CDs, separated the sp 2 structural domains, and retained more oxygen-containing functional groups. In the case of o-phenylenediamine (OPD) instead of MPD, the PL efficiency of P-doped CDs was decreased. This is ascribed to P impeding the polymerization process of OPD. These CDs were used for pH and Cr(VI) ion sensors. P-doping improved the sensitivity of CDs to pH and Cr(VI). The pKa value of sample M−6 %P-CDs was 8.32 which was much lower compared with undoped one (∼1.97). Moreover, P-doped CDs revealed significantly enhanced sensitivity response to Cr(VI). The detection range and detection limit of M−6 %P-CDs for Cr(VI) was 1–130 μM and 0.59 μM, respectively. These results are crucial for the preparation and applications of CDs.
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Materials
·
2024
·Vol. 17
·期 7
·1598
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IF 3.1
Yongqi Liu,Shasha Chu,Yuebing Xu,Xinyu Chen,Hao Zhou,Jinlin Li,Yanjie Ren,Xintai Su
Upcycling Cr-containing sulfate waste into catalysts for CO2hydrogenation reaction benefits both pollution mitigation and economic sustainability. In this study, FeCrO3/Fe2O3catalysts were successfully prepared by a simple hydrothermal method using Cr-containing sodium sulfate (Cr-SS) as a Cr source for efficient conversion and stable treatment of Cr. The removal rate of Cr in Cr-SS can reach 99.9% at the optimized hydrothermal conditions. When the synthesized catalysts were activated and used for the CO2hydrogenation reaction, a 50% increase in CO2conversion was achieved compared with the catalyst prepared by impregnation with a comparable amount of Cr. According to the extraction and risk assessment code (RAC) of the Reference Office of the European Community Bureau (BCR), the synthesized FeCrO3/Fe2O3is risk-free. This work not only realizes the detoxification of the Cr-SS but transfers Cr into stable FeCrO3for application in a catalytic field, which provides a strategy for the harmless disposal and resource utilization of Cr-containing hazardous waste.
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JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Dayu Sun,Dongdong Chu,Mingkai Xu,Chao Xing,Lan Ling
The remediation of multicomponent wastewater containing high-valent heavy metals and organic pollutants remains a significant environmental challenge. Visible-light-driven photocatalysis holds promise for concurrent pollutants decontamination, but is often hindered by sluggish interfacial charge transfer, rapid electron-hole recombination, and inadequate redox-active carriers. In this work, we present a dual-vacancy-incorporated Bi 2 WO 6 ( V -BWO) photocatalyst, featuring strategically introduced oxygen vacancies (OVs) and bismuth vacancies (BiVs), to overcome these constraints. Integrated theoretical and experimental investigations uncover a defect-mediated charge dynamics mechanism: OVs function as shallow electron traps enabling ultrafast charge capture, while BiVs function as deep relaxation sites that—under Cr(VI)-induced electron quenching—synergistically stabilize holes and extend their lifetime. This synergistic vacancy modulation achieves exceptional performance: a ciprofloxacin (CIP) degradation rate constant of 3.3 × 10 −2 min −1 with concurrent Cr(VI)-to-Cr(III) conversion (0.036 mmol/L reduced after 60 min). Notably, the catalyst sustains robust > 80.6 % contaminant removal efficiency in continuous-flow operation across diverse pollutants including CIP, bisphenol A (BPA), and rhodamine B (RhB). These findings elucidate the pivotal role of dual-defect states in tuning carrier dynamics and establishes a robust platform for integrated photocatalytic detoxification of multicomponent wastewater streams.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Zhaoxiang Zhong,Bochi Pan,Yi Xing,Hanlin Xu,Min Zhang,Lei Ding,Faliang Cheng
The extensive global application of chlorpyrifos (CPF) has led to significant environmental accumulation through aquatic systems, presenting substantial risks to ecological integrity and public health. This urgency necessitates advanced detection methodologies with enhanced sensitivity and operational efficiency to ensure environmental safety. Here, we developed a novel photoelectrochemical aptamer sensor utilizing a MIL-101(Cr)&Bi 2 S 3 heterostructure composite. This architecture synergistically integrates the broad-spectrum photon absorption capability of Bi 2 S 3 with the hierarchical porosity and structural stability of MIL-101(Cr), achieving remarkable enhancement in both electron-hole separation efficiency and interfacial charge transfer. The sensing platform was further optimized through aptamer functionalization, which confers precise molecular recognition capabilities while maintaining optimal charge transfer dynamics at the electrode interface. Systematic evaluation demonstrated exceptional analytical performance: a linear detection range spanning four orders of magnitude (0.05–10 μg/mL), ultralow detection limit of 0.022 ng/mL (S/N = 3). The developed methodology provides a versatile framework for adapting to other organophosphorus pesticide detection requirements through modular aptamer replacement.
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Desalination and Water Treatment
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2025
·
IF 1
Hongliang Zhang,Wensheng Tang
In this study, a polyethyleneimine (PEI)-modified magnetic sludge biochar (N@FeBC) was prepared via coprecipitation and impregnation methods for treating Cr(VI) contamination in aqueous and soils. Under conditions of pH 3 and 298 K, N@FeBC exhibited a utmost Cr(VI) removal amount of 82.97 mg/g. The removal behaviors were most accurately characterized the pseudo-second-order and Langmuir model. Thermodynamics analysis revealed that the reactions were spontaneous, endothermic, and accompanied by increased system entropy. The removal capacities progressively decreased as the pH rose from 2 to 10, with the optimal removal amounts occurring under acidic conditions. While coexisting cations had negligible effects on Cr(VI) adsorption, anions inhibited the process to varying degrees. Interestingly, humic acid presence improved the efficiencies of Cr(VI) removal. Notably, N@FeBC reduced low-concentrations of Cr(VI) in various water matrices to below the WHO drinking water standard (0.05 mg/L), and retained excellent performance after 15 reuse cycles. In soil stabilization tests, N@FeBC more effectively reduced Cr(VI) toxicity in contaminated soil. Mechanistic investigations revealed that Cr(VI) removal occurred via electrostatic attraction to protonated surface functionalities, partial reduction to Cr(III), and subsequent coordination with functional groups. This study indicates that N@FeBC can serve as an efficient material for removing Cr(VI) contamination.
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CARBON
·
2021
·
IF 9.594
Mingyan Jia,Lulin Peng,Maohua Yang,Huangzhao Wei,Mei Zhang,Yu Wang
In this article, we show that the conventional boron-nitrogen co-doped carbon dots (BNCDs) exhibit unique fluorescent ratiometricity in the detection of Cr (VI) due to their unique dual emission system. The 3D fluorescence spectrum study reveals that besides the commonplace emission centered at (360, 465) nm in blue fluorescence region, another center which may be corresponding to N-contain conjugation domains is found at (490, 535) nm. In the presence of Cr (VI) ions, the emission centered at (360, 465) nm is remarkably quenched due to inner filter effect, whereas the emission centered at (490, 535) nm is almost unchanged. By spectrally simulating inner filter effect using different excitation interferents in the 3D fluorescence spectrum study, accompanied with the fluorescence lifetime and absorption comparison, the sensing mechanism has thoroughly been illustrated. The versatile sensing capability of BNCDs in the different real samples not only provides a new way for the rapid determination of Cr (VI) in practices, but also demonstrates the great potential of the carbon-based materials with multiple emission possess in developing ratiometric sensing platform for rapid and accurate assay of different kinds of analytes.
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ENVIRONMENTAL POLLUTION
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2016
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IF 4.839
Na Li,Fenglian Fu,Jianwei Lu,Zecong Ding,Bing Tang,Jiabin Pang
Chromium-contaminated water is regarded as one of the biggest threats to human health. In this study, a novel magnetic mesoporous MnFe 2 O 4 @SiO 2 −CTAB composite was prepared by a facile one-step modification method and applied to remove Cr(VI). X-ray diffraction, scanning electron microscopy, transmission electron microscopy , specific surface area, and vibrating sample magnetometer were used to characterize MnFe 2 O 4 @SiO 2 −CTAB composites. The morphology analysis showed that the composites displayed a core-shell structure. The outer shell was mesoporous silica with CTAB and the core was MnFe 2 O 4 nanoparticles , which ensured the easy separation by an external magnetic field. The performance of MnFe 2 O 4 @SiO 2 −CTAB composites in Cr(VI) removal was far better than that of bare MnFe 2 O 4 nanoparticles. There were two reasons for the effective removal of Cr(VI) by MnFe 2 O 4 @SiO 2 −CTAB composites: (1) mesoporous silica shell with abundant CTA + significantly enhanced the Cr(VI) adsorption capacity of the composites; (2) a portion of Cr(VI) was reduced to less toxic Cr(III) by MnFe 2 O 4 , followed by Cr(III) immobilized on MnFe 2 O 4 @SiO 2 −CTAB composites, which had been demonstrated by X-ray photoelectron spectroscopy results. The adsorption of Cr(VI) onto MnFe 2 O 4 @SiO 2 −CTAB followed the Freundlich isotherm model and pseudo-second-order model. Tests on the regeneration and reuse of the composites were performed. The removal efficiency of Cr(VI) still retained 92.4% in the sixth cycle. MnFe 2 O 4 @SiO 2 −CTAB composites exhibited a great potential for the removal of Cr(VI) from water.
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CHEMICAL ENGINEERING JOURNAL
·
2019
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IF 8.355
Qiaoyuan Gao,Dagang Lin,Yongjie Fan,Qin He,Qi Wang
Visible-light-active Fe-2MI assemblies were prepared at room temperature using 2-Methylimidazole (2MI) as organic ligand to form complex with Fe(II) or Fe(III). TGA and XRD characterizations indicated that Fe(II) can form more stable complex and higher coordinating percentage with 2MI relative to Fe(III). Besides, Fe(II)-2MI displayed amorphous state with larger BET surface area and higher photocurrent response. At very low catalyst dosage (0.1 g/L), highest activity for Cr(VI) reduction can be achieved using Fe(II)-2MI as photocatalyst. The estimated pseudo-first-order rate constant (0.021 min −1 ) was 1.4 and 2.1 times that on Fe(III)-2MI and Fe(II)-NaOH, respectively. The well-known ZIF-67 (Co-2MI), ZIF-7 (Zn-2MI) and Fe-MOFs with other organic ligands (H 2 BDC, NH 2 -H 2 BDC or FA) were also used as control samples. Optimal activity for photocatalytic reduction of Cr(VI) was achieved by Fe(II)-2MI. The operating factors was optimized at acidic pH (2.0), higher catalyst dosage (0.3 g/L) and appropriate concentration of coexisting organics (2.0 mM) within the tested range. The stability of Fe(II)-2MI was investigated at different pH values (2, 3 and 4.64), which all displayed good stability. Mechanism study indicated that Fe(II)-2MI has adequate conduction and valence band positions for Cr(VI) reduction and organics oxidation, respectively. Therefore, the as-prepared amorphous Fe(II)-2MI assemblies may be cheap, stable and easy available candidate for the photocatalytic disposal of Cr(VI)-containing wastewaters.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Hong-Mei Cheng,Shi-Xi Zhao,Xia Wu,Jian-Wei Zhao,Lei Wei,Ce-Wen Nan
The crystal structure of the Li 2 MnSiO 4 cathode material would collapse during the charge and discharge process because of that the Mn-O coordination polyhedron changed from [MnO 4 ] into [MnO 6 ] in the process of Mn +2 to Mn +4 , but the Cr element could remain [CrO 4 ] crystal ligand from Cr +2 to Cr +4 , so Cr element substitution was used to improve the structural stability of the Li 2 MnSiO 4 cathode material. In this work, Li 2 Mn 1-x Cr x SiO 4 /C nanocomposites were synthesized by solid-state method. XRD, SEM and TEM observations show that the as-prepared Li 2 Mn 1-x Cr x SiO 4 /C materials presents an orthorhombic crystal structure (S.G. Pmn2 1 ), the particle size of Li 2 Mn 1-x Cr x SiO 4 /C powder ranges from 50 to 100 nm. The XRD and XPS results indicate that Cr +2 is successfully doped into Li 2 MnSiO 4 lattice and has well compatibility with Li 2 MnSiO 4 . The electrochemical results display that Li 2 Mn 92.5% Cr 7.5% SiO 4 /C exhibits significantly enhanced cycle stability and discharge capability. The initial discharge capacity of the Li 2 Mn 92.5% Cr 7.5% SiO 4 /C sample is 255 mAh g −1 , and the discharge capacity was still about 60 mAh g −1 after 50 cycles. Furthermore, the XRD patterns, TEM images and Raman analysis reveal that the Cr doping enhances the structural stability of Li 2 Mn 1-x Cr x SiO 4 /C and improves the electrochemical activity of the cathode. Thus, the Li 2 Mn 92.5% Cr 7.5% SiO 4 /C have shown potential applications for lithium ion batteries.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Qunfeng Kuang,Kun Liu,Qikun Wang,Qibing Chang
Biochar is used as adsorption material for transition metal ions based on its special high surface area. However, the ion adsorption capacity is limited by the inability through the increasing of specific surface area. Three-dimensional hierarchical pore biochar (ASPB) is prepared by pre-carbonization and KOH activation using soybean protein with gelation properties to construct a three-dimensional framework structure of biomass. The saturation level of Cr(VI) adsorption in 250 mg·L −1 Cr(VI) solution is 489.66 mg·g −1 , which is attributed to the ASPB's vast 2788 m 2 ·g −1 surface area and three-dimensional hierarchical pore structure, with pore structure data indicating an empty volume of 1.65 cm 3 ·g −1 and a 2.386 nm size average pore size. The Cr(VI) adsorption level is higher than the calculated saturated capacity according to Langmuir equation based on the specific surface area. The extra adsorption performance is contributed to the transport channels provided by the three-dimensional framework structure, the large and abundant ion riveting sites provided by micro-mesopores, and the redox and complexation of surface-active groups. The saturated adsorption capacity can keep 86.6 % after three adsorption–desorption cycles.
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