Desalination and Water Treatment
·
2024
·
IF 1
Jinfeng Yuan,Weidong Lu
Inorganic clays modified magnetic chitosan adsorbent (ICMMCA) was successfully prepared and systematically characterized in chemical structure and morphology. Effect of variables including initial pH and concentration of Cr(VI) in the solution, adsorption time, adsorption temperature and coexisting ions on the performance of ICMMCA in Cr(VI) removal from water were evaluated. Furthermore, the kinetic and thermodynamic studies were conducted to elucidate the adsorption mechanisms and thermodynamic characteristics of the adsorption process. The results demonstrated that the maximum Cr(VI) adsorption capacity of 94.67 mg/g could be achieved when the adsorbent loading was 1 g/L, the initial concentration of Cr(VI) was 100 mg/L, the adsorption time was 60 min and solution pH was at 5. The adsorption data could be well fitted by the Freundlich isotherm model. The thermodynamic parameters indicated that the adsorption process was spontaneous and endothermic in nature. The adsorption process could be described by the pseudo-second-order kinetic model.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chengfang Zhang,Zhenyu Song,Chao Li,Qinglong Liu,Jingchun Tang
In the actual polluted environment, the composite pollution system was usually composed of heavy metals and organic pollutants, especially Cr(VI) and chlorophenols often co-existed in industrial wastewater. In this study, a composite material consisting of multilayer graphene carbon shells coated with nZVI (gBC@nZVI) with various excellent properties was applied to deal with the composite system of Cr(VI) and 2,4-dichlorophenol (2,4-DCP) coexisting in the wastewater, and the intrinsic mechanism for the simultaneous removal of heavy metals and organic pollutants was systematically investigated. The results showed that in the composite pollution system (Cr(VI) = 20 mg/L, 2,4-DCP = 15 mg/L), complete removal of Cr(VI) could be achieved in 60 min, while 2,4-DCP achieved 95.2 % removal, with the contribution of oxidative degradation being 76.4 %. It was found that during the efficient adsorption and reduction of Cr(VI) by gBC@nZVI, the generation of the metastable intermediate Cr(V) was verified by probe compounds, electron spin resonance and UV–visible spectroscopy, and further experiments demonstrated that the generation of •OH was closely related to Cr(V) and promoted the oxidative degradation of the coexisting 2,4-DCP. Quenching experiments with the addition of specific scavengers indicated that •OH was the active species directly dominating the oxidative degradation of 2,4-DCP, whereas Cr(V) was indirectly involved in the degradation of 2,4-DCP by promoting the generation of •OH. In addition, the increase of solution pH negatively affected the degradation of 2,4-DCP in the composite polluted system, mainly due to the hindered generation of •OH in the alkaline environment. This work provided theoretical support for the promising application of gBC@nZVI in real environments contaminated with a combination of Cr(VI) and chlorophenols.
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Carbon Letters
·
2025
·
IF 5.8
Ren Zhiyuan,Chang Wei,Tian Ke,Yao Peiqi,Liu Bin,Li Yunfeng,Zhang Runze
This study details the synthesis and characterization of phosphorus-sulfur co-doped graphitic carbon nitride quantum dots (PSQ) and their integration into g-C 3 N 4 (CN) to form PSQ/CN composites for the enhanced photocatalytic reduction of Cr(VI) and fluorescence detection. Incorporating PSQ into CN was found to significantly improve light absorption, narrow the band gap, and enhance charge separation efficiency. Notably, the composite material exhibits superior photocatalytic performance, especially in acidic environments. Photocatalytic assessments utilizing Cr(VI) demonstrated that the PSQ/CN composite outperformed both undoped and singly doped materials, indicating its superior photocatalytic activity. Additionally, phosphorus-sulfur co-doping markedly increased the fluorescence quantum yield of PSQ. The fluorescence intensity exhibited a linear decrease with increasing Cr(VI) concentrations, enabling sensitive and selective detection of Cr(VI) with a detection limit as low as 1.69 μmol/L. Collectively, the PSQ/CN composite and PSQ highlight their potential for photocatalysis and fluorescence-based detection of Cr(VI), providing high sensitivity, selectivity, and synergistic interactions within the composite material.
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Journal of Cleaner Production
·
2025
·
IF 10
Tong Xu,Xiaopei Ding,Chengcai Li,Haoyang Cheng,Guojin Liu,Hailin Zhu,Yuhai Guo,Xueliang Jiang,Jiuming Li
Accelerated industrial expansion has led to significant wastewater pollution, with effluent containing the toxic heavy metal Cr(VI) posing severe threats to ecosystems and human health. The combination of metal-organic frameworks (MOFs) and membrane separation techniques offers promising solutions for pollutant removal. This study developed a polytetrafluoroethylene (PTFE)-based composite membrane for effective Cr(VI) removal from aqueous solutions. This membrane was prepared through the in-situ synthesis of zinc-zirconium bimetallic MOFs on a PTFE membrane that had been modified with L-DOPA/PEI. The composite membrane demonstrated optimal Cr(VI) adsorption at a Zr:Zn molar ratio of 1:4, under conditions of 45 °C and pH = 2, with a maximum adsorption capacity of 335.1 mg/g. The adsorption process of Cr(VI) onto the composite membrane adhered to both the pseudo-second-order kinetic model and the Freundlich adsorption isotherm. Thermodynamic analyses confirmed a spontaneous, endothermic process. The composite membrane, with its excellent adsorption capacity, filtration performance, and recyclability, stands out as a highly effective material for the removal of Cr(VI) from aqueous solutions. Furthermore, it addresses the issues of aggregation, difficulty in separation, and the recycling challenges associated with powder-like MOFs, demonstrating significant potential for practical applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
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IF 21.1
Ziwei Ma,Jingyi Wang,Wei Wang,Xueyi Song,Yating Liu,Shaobin Wang,Yunjin Yao
We engineered a NiSe/Ni₃Se₂ heterostructure on nickel foam that activates formic acid for rapid hexavalent chromium detoxification. We used one-step hydrothermal growth and probed structure and mechanism by diffraction and spectroscopy, electron microscopy, electron paramagnetic resonance with 5,5-dimethyl-1-pyrroline N-oxide, and batch and fixed-bed tests. The optimized catalyst removed 99.7% of 50 mg L⁻¹ hexavalent chromium in 40 minutes at 25 °C, achieved full removal of 1 mg L⁻¹ in 20 minutes, tolerated common ions, and maintained 100% removal for 180 h in continuous flow. Mechanistic analyses show a radical pathway dominated by hydrogen radicals (H ⁎ ) and carbon dioxide radical anions ( C O 2 • − ), promoted by selenium vacancies and tightly coupled nickel selenide interfaces that accelerate formic-acid activation and interfacial charge transfer. Operating without external energy input, this monolithic architecture avoids powder recovery and minimizes pressure drop and cost, offering a general route to defect-engineered selenides for efficient, low-cost environmental redox remediation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
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IF 5.4
Zhiru Wang,Meng Su,Chanjuan Wang,Yuxin Wang,Ying Liu,Xiaoshuang Yin,Wenzhong Yang,Hui Xu
A robust composite hydrogel (i.e., ZnO@(CNC- g -PAA/PEI)) integrating cellulose nanocrystal-grafted polyacrylic acid/polyethyleneimine with uniformly dispersed ZnO nanoparticles (NPs) was synthesized through dual chemical-physical cross-linking strategies. This multifunctional hydrogel synergistically combines adsorption and photocatalytic reduction for efficient Cr(VI) removal, exhibiting exceptional stability, recyclability, and performance. Systematic optimization revealed that pH, ZnO loading, adsorbent dosage, and contact time critically influenced removal efficiency. Under optimal conditions (pH at 3, 15 wt% ZnO loading, 100 mg/L Cr(VI), 0.5 g/L adsorbent), a remarkable 99.03 % Cr(VI) removal was achieved. The enhanced efficacy arises from three synergistic features: (1) a 3D porous architecture enabling rapid Cr(VI) diffusion, (2) abundant protonated amine groups for electrostatic adsorption, and (3) homogeneously distributed ZnO NPs minimizing aggregation and maximizing photocatalytic activity. Simulated light irradiation triggered Cr(VI)-to-Cr(III) reduction, regenerating active sites and amplifying removal capacity. Kinetic analyses confirmed pseudo-second-order adsorption. The hydrogel retained 94.75 % efficiency after five cycles, demonstrating robust reusability. This work provides a scalable strategy for designing hydrogel-based adsorbent-photocatalyst hybrids, offering a sustainable solution for chromium-laden wastewater remediation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Lingling Zhou,Ao Qu,Jing Guo,Zhanxiang Zhang,Hongru Li,Yanhui Zhao,Zhe Zhang,Xudong Yang
Developing solid-state red light–emitting carbon quantum dots (CQDs) with high photothermal stability remains a key challenge in this field. This study successfully constructed a new dual–function fluorescent nanocomposite material (RCDs@ZIF-8) by encapsulating 4,4-dihydroxybenzophenone and o-phenylenediamine-derived red fluorescent carbon quantum dots in ZIF-8 metal–organic frameworks. The porous structure of ZIF-8 effectively confines RCDs, significantly improving their photostability and fluorescence specificity, and successfully imparting them with intense red solid–state fluorescence. The RCDs@ZIF-8 composite material exhibits extremely high red fluorescence intensity in a solid state and can be used as an efficient, ratio–type fluorescent probe. In solution, it exhibits a highly selective fluorescence quenching response to Cr 6+ ions with a detection limit of 0.49 μM, making it suitable for the rapid, visual detection of trace amounts of Cr 6+ in environmental water samples. More importantly, the strong solid-state fluorescence of this material enables the high-contrast visualization of latent fingerprints, with clear and distinct fingerprint lines. RCDs@ZIF-8 integrates efficient solution sensing (Cr 6+ detection) and high–performance solid-state light emission/imaging (fingerprint identification, optical applications) in a dual-function manner. It has a wide range of applications in environmental monitoring, forensic identification, and optical anti–counterfeiting.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
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IF 4.6
Jiaqi Wang,Yuan Fu,Dong Liang,Jiangbo Pan,YiChang Jing,Changhe Liao,Di Wang,Shuangying Wei,Chengyu Wang,Jian Li
Carbonized polymer dots (CPDs), a new nanofluorescent materials inheriting the advantages of CDs, have been widely studied for their excellent physicochemical stability and tunable fluorescence properties, and have extensive application in the fields of optoelectronic devices and environmental monitoring. In this study, nitrogen-doped CPDs (CMC-M-CPDs) were synthesized via hydrothermal reaction using carboxymethyl cellulose (CMC) and melamine (M), which allowed N doping to improve the luminescence of CPDs through cross-linking and reduction of the energy gap. Due to the excitation-dependent, the luminescence wavelength of CPDs can be tuned, so these CPDs exhibit two optimal emission centers in the fluorescence spectra, which originate from the carbon core and the surface, respectively. A significant quenching effect on the luminescence of CMC-M-CPDs at 457 nm and 515 nm was exhibited due to static quenching of Cr(VI). Therefore, dual-channel fluorescence detection of Cr(VI) can be achieved, allowing detection using both excitation wavelengths to be carried out concurrently and mutually verified in complex environments. This improves the accuracy of detection, with limits of detection (LOD) of 60.15 nM and 93.95 nM, respectively. The CMC-M-CPDs demonstrate excellent selectivity and anti-interference in the detection of Cr(VI), with a quenching response occurring within 1 s. This dual-channel fluorescent probe can also be applied for sensitive detection in tap water and Songhua River water. Furthermore, the fluorescence of quenched CPDs can be restored by adding ascorbic acid (AA), achieving a maximum recovery efficiency of 96.6 %.
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PubMed
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Junjie Su,Qi Yang,Zhihu Zhang,Ziyue Zhang
Nowadays, Ni/Fe bimetallic nanocomposites have shown great potential for removing Cr(VI). However, the action of Ni 0 in Cr(VI) removal is still controversial, which was studied in this work. In this study, Ni/Fe@Fe 3 O 4 -g-C 3 N 4 (NFFOCN) nanocomposites were applied to remove Cr(VI) from aqueous solutions and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and other methods. Batch experiments were conducted to evaluate the Cr(VI) removal performance. Experimental results demonstrated that under optimal operating conditions (pH 5.5, 10 mg/L Cr(VI), 0.3 g/L NFFOCN, 30°C), a Cr(VI) removal efficiency of 90.78% was achieved within 50 min. Theoretical maximum adsorption capacity was calculated to be 36.101 mg/g. Combining experimental and characterization results, it could be concluded that Cr(VI) removal was attributed to the synergistic effect of the NFFOCN components. Ni 0 not only participated directly in the reduction of Cr(VI) as an electron donor, but also converted the corrosion product H 2 of nano-zero-valent iron (nZVI) into highly reducible atomic hydrogen (·H) to remove Cr(VI). Additionally, Ni 0 could form a primary battery with nZVI, facilitating the electron transfer between nZVI and Cr(VI). NZVI and its derivatives, Fe 2+ ions and green rust, were responsible for Cr(VI) reduction. Furthermore, the presence of Fe 3 O 4 and carbon nitride (g-C 3 N 4 ) improved the stability and reactivity of the nanocomposites.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
You Yanran,Zhu Hongtao,Dong Hongliang,Sheng Guodong
In this work, FeS was anchored on mesoporous silica microspheres (SiO 2 200, SiO 2 500, and SiO 2 1000), and named as FeS@SiO 2 (i.e., FeS@SiO 2 200, FeS@SiO 2 500, FeS@SiO 2 1000), in adsorbing and detoxifying U(VI)/Cr(VI) from wastewater. Results demonstrated that FeS@SiO 2 exhibited higher efficiency towards U(VI)/Cr(VI), outperforming FeS and SiO 2 alone. Kinetic investigations revealed that adsorption of U(VI)/Cr(VI) followed pseudo–second–order model best, highlighting effective chemical interplay. XPS investigations demonstrated multi–species which was included FeS, Fe(II), S 2− and polysulfide (S 2 2− , S n 2− ) could be employed as reductants for U(VI)/Cr(VI) adsorption. The combination of SiO 2 and FeS offered an enhanced efficiency for U(VI)/Cr(VI), making these composites promising materials in water purification. Graphical
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INTERNATIONAL BIODETERIORATION & BIODEGRADATION
·
2024
·
IF 4.1
Liwen Zhang,Luyao Xi,Shuyu He,Huizi Wen,Shanyi Tan,Shaohua Chen
Bioremediation has garnered considerable interest due to its advantages of economy and no secondary pollution. However, the direct electron transfer rate between microorganisms and Cr(VI) is low. The bioreduction of Cr(VI) by Shewanella oneidensis MR-1 ( S. oneidensis ) in the presence of formylmethylflavin (FMF) was conducted to understand how FMF mediated the extracellular electron transfer process to improve Cr(VI) removal. In this study, FMF was firstly synthesized by modifing RF to increase its solubility and redox activity. The findings indicate that S. oneidensis /FMF exhibited better Cr(VI) removal performance compared to that of S. oneidensis . Under optimum conditions, 40 mg/L Cr(VI) could be completely removed by S. oneidensis /FMF within 120 h, while only 48.6% of Cr(VI) was removed by S. oneidensis , and the first order rate constant (k) for the Cr(VI) elimination by S. oneidensis /FMF (0.033 h −1 ) was about 4.1-fold greater than that of S. oneidensis (0.008 h −1 ). Moreover, the removal of Cr(VI) by S. oneidensis /FMF were dominated by reduction, and supplemented by adsorption and complexation. FMF enhance the extracellular electron transfer rate (EETR) was confirmed by electrochemical cyclic voltammetry (CV) and linear scanning voltammetry (LSV) experiments. This study emphasizes the potential important role of FMF in environmental bioremediation.
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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.
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