JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2026
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IF 2.7
Pengfei Guo,Meng Wang,Yingbo Chen
BACKGROUND The treatment of industrial wastewater containing chromium (Cr(VI)) and rhodamine B (RhB) is a critical environmental protection issue. Fenton-like systems have been widely considered for their potential in wastewater treatment, but developing efficient and practical Fenton-like materials and methods remains a key challenge. This study focuses on exploring the effectiveness of a Fenton-like system composed of a zero-valent iron-based composite material (HTCTSIP-5) and exogenous hydrogen peroxide (H₂O₂) for the removal of Cr(VI) and RhB from wastewater. RESULTS The effects of various parameters, including dosing methods, pH levels, content of HTCTSIP-5 and H₂O₂, and initial concentrations, on the removal efficiency were studied. Techniques such as electron paramagnetic resonance, scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy were employed to investigate the underlying mechanisms of removal of Cr(VI) and RhB. The results revealed that the HTCTSIP-5/H₂O₂ system exhibited high removal efficiencies for both Cr(VI) and RhB, with hydroxyl radicals ( • OH) identified as the key agents in RhB degradation. CONCLUSION This study confirms that the use of the HTCTSIP-5/H₂O₂ Fenton-like system is an effective approach for the treatment of wastewater containing Cr(VI) and RhB. It provided an effective material and method for industrial wastewater treatment, offering a valuable approach for environmental protection. © 2026 Society of Chemical Industry (SCI).
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SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Xinlan Wang,Ri’an Fu,Xiong Wu,Huasheng Lai
Surface-enhanced Raman spectroscopy (SERS) often suffers from poor selectivity, sensitivity, and anti-interference capabilities in metallic ions detection. Herein, a redox-mediated SERS method is presented for on-site detecting Cr(VI) in complex samples with ultrahigh sensitivity (2.6 fmol/L), selectivity, and rapidity (within 5 min). 2-Mercaptoimidazole was selected as the SERS probe due to its strong SERS activity and the ability of its thiol group to reduce Cr(VI) to Cr(III). The redox reaction between Cr(VI) and thiol group of 2-mercaptoimidazole under acid condition was investigated, including pH, mixing ratio, temperature, and concentration. Remarkably, the reaction equilibrium was achieved within 1 min. Furthermore, the method exhibited high selectivity for Cr(VI) over other ions due to its strong oxidizing properties, and excellent anti-interference capabilities attributed to the robust sulfur-metal bond formation. The redox-mediated SERS method with ultrahigh sensitivity and a detection limit of 2.6 fmol/L, which is 12 orders of magnitude below the safety level (0.1 mg/L) set by United States Environmental Protection Agency for drinking water. Finally, the method was successfully applied to detect Cr(VI) residues in environmental water and traditional Chinese medicine drinking samples (Codonopsis pilosula and Astragalus membranaceus), achieving satisfactory recoveries (85.5–110%) and low RSDs (0.1–4.2%). This work not only advances the analytical performance for on-site detection of Cr(VI) residue but also offers a versatile tool with substantial implications for public safety monitoring and pharmaceutical quality control.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Liwen Zhang,Shaohua Chen,Shanyi Tan,Huizi Wen,Shuyu He,Fen Zhang,Xiangru Zuo,Ling Xiong
The inherent limitations of nano zero-valent iron (nZVI) severely limit its widespread application in heavy metal pollution remediation. To address this, Shewanella oneidenis MR-1 (MR-1) was utilized to counteract the iron oxide passivation layer on nZVI surface, however, this approach suffered from low electron transfer rate between MR-1 and the passivation layer. In this research, a novel PDA-modified nZVI composite (PDA-nZVI) was synthesized. Compared to unmodified nZVI, the proportions of Fe 0 and Fe(II) on the PDA-nZVI surface increased 2.06 % and 21.63 %, respectively. The electrochemical tests (e.g., a more negative corrosion potential, a lower charge-transfer resistance, a higher current density, and a 3.4-times larger electrochemical active surface area for PDA-nZVI compared to nZVI) confirm that PDA enhances electron transfer from iron core to the outside, thereby promoting Fe 0 availability and Fe(II) generation on the PDA-nZVI surface. Meanwhile, PDA modification successfully enhanced the material's dispersibility and hydrophilicity in aqueous solutions. Results demonstrate that the Cr(VI) elimination capacity of the PDA-nZVI and MR-1 combined system (PDA-nZVI/MR-1) was markedly superior to that of the nZVI/MR-1 system. Mechanism analyses demonstrate that PDA can act as an electron shuttle to accelerate electron transfer between MR-1 and the passivation layer, thereby promoting more Fe(III) transformation to Fe(II). This process enables more Cr(VI) to be reduced to Cr(III), which is subsequently adsorbed or complexed on the material surface as Cr 2 O 3 /FeCr 2 O 4 and Cr x Fe 1-x (OH) 3 , ultimately being removed from the solution via co-precipitation. The PDA-nZVI/MR-1 system successfully overcomes the inherent limitations and exhibits an exceptional Cr(VI) elimination capability
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INDUSTRIAL CROPS AND PRODUCTS
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2023
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IF 5.9
Qianqian Tang,Hao Wu,Mingsong Zhou,Dongjie Yang
To remove Cr(VI) in water, a novel lignin-based anionic adsorption resin epichlorohydrin cross-linking lignin grafted by diethylenetriamine (E-DAL) was prepared by the direct cross-linking and curing of alkali lignin grafted by diethylenetriamine in aqueous solutions. Under the determined optimum synthesis conditions, E-DAL with higher nitrogen (7.46%) and lignin (32.78%) contents was obtained. Structural and physicochemical measurement results showed E-DAL was a macroporous resin, having a regular connected pore structure with porosity of 67.48% and pore size of 615.6 nm, also strong hydrophilicity, excellent acid-alkaline resistance and thermal stability. Adsorption experiment results indicated the adsorption isotherm of E-DAL to Cr(VI) was well-described by Langmuir model. E-DAL showed a higher adsorption capacity to Cr(VI), and the fitted maximum adsorption capacity reached up to 775.2 mg/g. Pseudo-second-order model could fit this adsorption process well, suggesting its chemisorption characteristics. The calculated thermodynamic parameters indicated a spontaneous and endothermic adsorption of E-DAL to Cr(VI). Dynamic column adsorption results showed E-DAL could completely remove Cr(VI) in wastewater. This whole preparation process only used a very small amount of cheaper amination agent and was relatively low-cost. This work provided efficient technical supports for the structural design of high-performance lignin-based anionic adsorption materials in water treatment field.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Qi Zhang,Kailin Gong,Xuechun Shao,Weiyu Liang,Wei Zhang,Cheng Peng
Microplastics (MPs) in farmland soil may affect the environmental fate and toxicity of heavy metals; however, how non-biodegradable and biodegradable MPs change the accumulation and phytotoxicity of Cr(VI) to the plants is still unknown. In this study, we explored the impacts of Cr(VI) concentrations (0, 20, 50, 100, 200, and 500 μmol/L), MP types (polyethylene (PE), polyamide (PA), and polylactic acid (PLA)), sizes (13, 48, and 500 µm), and concentrations (40, 200, and 1000 mg/L) on the Cr accumulation and toxicity to cucumber ( Cucumis sativus L.) under hydroponic conditions for 14 days. The results show that the presence of PE-MPs promoted the Cr accumulation in root by 8–39.8%. However, PA-MPs inhibited the Cr accumulation in the whole plant under less than 100 μmol/L Cr(VI). Notably, 1000 mg/L PA-MPs significantly reduced Cr accumulation in root and stem by 44.70% and 48.20%, respectively. Moreover, PE-MPs and PLA-MPs reduced the chlorophyll content and slowed down the growth of seedlings, while PA-MPs were beneficial to the growth of cucumber under 50–500 μmol/L Cr(VI) treatments, increasing the biomass by 20.99–189.99%. Furthermore, PE-MPs enhanced the content of MDA , especially under 500 μmol/L Cr(VI) concentration by 27.39%; however, the addition of PA-MPs and PLA-MPs slightly enhanced the enzyme activities including superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT). Significantly, 1000 mg/L PA-MPs promoted biomass and reduced MDA content compared the control due to their high Cr(VI) adsorption efficiency. Thus, MP type, especially PE-MPs, mainly determined the Cr accumulation and phytotoxicity, which was attributed to the various adsorption capacities of MPs to Cr(VI).
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PubMed
高影响因子
Journal of Water Process Engineering
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2022
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IF 7.34
Qi Jing,Wenhui You,Shuo Qiao,Yuheng Ma,Zhongyu Ren
In this study, nano zero-valent iron-reduced graphene oxide (NZVI-rGO) was successfully synthesized and applied for 2,4-DCP and Cr (VI) removal. Characterization results show that NZVI particles were successfully loaded on rGO nanosheets increasing the dispersibility of particles. Removal experiments indicate that the existence of rGO significantly enhanced the removal efficiency of 2,4-DCP and Cr (VI) compared with bare nano zero-valent iron. The removal rate of 2,4-DCP and Cr(VI) increased from 33.24 % and 63.14 % to 100 % and 98.40 %, respectively. Pseudo-second-order model and Langmuir isotherm model could better explain the 2,4-DCP removal process. The removal mechanism of 2,4-DCP in the process of simultaneous removal is adsorption, including π-π interaction, hydrogen bonding and n-π EDA interaction between Cr(VI) and 2,4-DCP. Cr(VI) is firstly fixed on the surface of NZVI-rGO by electrostatic interaction. The electrostatic interaction between γ-FeOOH and Cr(VI) and the strong connection formed by n-π EDA interaction between Cr(VI) and 2,4-DCP promote the adsorption of Cr(VI) in coexisting system. Subsequently, Cr(VI) is reduced to Cr(III) by accepting the electrons donated by NZVI, and Cr(III) interacts with OH − in the solution to generate Cr(OH) 3 precipitate. The existence of rGO accelerates the rate of electron transfer to Cr(VI) in NZVI. This study provides theoretical support for remediation of combined pollution of chlorinated organics and heavy metals.
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CHEMOSPHERE
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2023
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IF 8.8
Xiaoming Zhang,Qi Li,Kai Nie,Kaiting Cao,Qi Liao,Mengying Si,Zhihui Yang,Weichun Yang
Effective remediation of Cr(VI)-contaminated soil with strong alkalinity and high Cr(VI) concentration is a severe challenge. Herein, a proton-buffering montmorillonite-supported sulfidated nano zerovalent iron (nFeS/Fe 0 @H–Mt) was developed for remediation of alkaline Cr(VI)-contaminated soil. The reductive efficiencies of water-soluble Cr(VI) reached 99.7%, 99.3% and 99.8% in three tested soils with initial concentrations of 439.6, 3307.5 and 4626.7 mg kg −1 , respectively, after 15 d of nFeS/Fe 0 @H–Mt treatment. Further speciation analyses demonstrated most available Cr species (exchangeable and carbonate-bound Cr) were transformed into more stable Cr species. The leachable Cr(VI) and total Cr obtained by toxicity leaching procedures decreased to extremely low levels and maintained long-term stability for 120 d. Such superior reductive immobilization performance of FeS/Fe 0 @H–Mt was attributed to the synergistic effect of sulfidated nano zerovalent iron and proton-buffering montmorillonite , which induced the coordination of proton donation and electron transfer . The proton-buffering montmorillonite (H–Mt) could prevent the aggregation of nanoparticles and provide protons to accelerate the corrosion of Fe 0 . In addition, the FeS component improved electron selectivity and facilitated electron transfer of Fe 0 to Cr(VI). Our study demonstrated that the coordination of proton donation and electron transfer significantly enhanced the Cr(VI) reduction under the alkaline condition thus leading to effective remediation of alkaline Cr(VI)-contaminated soil.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Ziyong Chang,Baili He,Xiaosha Gong,Xiaoyue Qi,Kexin Liu
Preparation of efficient adsorbents is of great significance for the recovery of precious metals from secondary resources. Herein, –NH 2 was successfully grafted on MIL-101(Cr) via hydrothermal reaction to improve the adsorption capacity of Au (Ⅲ) in aqueous solution. MIL-101(Cr)–NH 2 had a huge specific surface area (1016.50 m 2 ‧g −1 ), which can provide more adsorption sites for Au (III). At 298 K, the maximum adsorption capacity of Au (III) by MIL-101(Cr)–NH 2 was 792.43 mg∙g −1 and was higher than that by MIL-101(Cr) (140.83 mg∙g −1 ). The adsorption data was well fitted by Langmuir and pseudo-second-order models, confirming that the adsorption process conformed to single molecule adsorption and chemical adsorption . Mechanism study indicated that the adsorption of Au (III) by MIL-101(Cr)–NH 2 was initiated with electrostatic attraction and promoted by reduction and inner complexation between AuCl 4 - and protonated amino groups. During adsorption, Au (Ⅲ) was reduced to Au (0) and Au (I) by –NH 2 . Density functional theory (DFT) calculation demonstrated that MIL101(Cr)–NH 2 possessed higher binding affinity and more adsorption sites for Au (III) than MIL-101(Cr). Moreover, MIL-101(Cr)–NH 2 exhibited excellent selectivity towards Au (III) and good recyclability, which is promising in the recovery of precious metals.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Hao Du,Ningyi Li,Lingxuan Yang,Qiang Li,Guoxiang Yang,Qi Wang
Environmental crisis caused by Cr(VI) pollution has gained remarkable attention. Developing efficient photocatalysts for Cr(VI) remediation remains a great challenge. Herein, the Ag@Ag 3 VO 4 /Ag 3 PMo 12 O 40 (Ag@Ag 3 VO 4 /AgPMo) S-scheme heterojunctions were prepared via the combination of hydrothermal and photodeposition methods for Cr(VI) reduction. The resultant S-scheme heterojunctions were characterized to investigate their morphological, structural, photoelectrochemical and optical properties. The synergy of surface plasmon resonance (SPR) effect of Ag and S-scheme hetero-structure improved their photo(electro)chemical performance. Upon visible light irradiation, the optimized Ag@Ag 3 VO 4 /AgPMo delivered superior photoreduction efficiency (94.8%) of Cr(VI) and stability with a slight loss of the performance (92.8% after 6 cycles). The enhancement of Cr(VI) reduction performance may be ascribed to the extended light absorption range and separation and migration pathway of photo-induced electron-hole pairs confirmed by the proposed photoreduction mechanism. This work not only confirms a highly active catalytic system for the light-driven environmental application, but pave a way for the construction of S-scheme heterojunction photocatalysts.
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SURFACE & COATINGS TECHNOLOGY
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2022
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IF 4.865
Xiang Hou,Hao Wang,Qun Yang,Yanxia Chen,Linjiang Chai,Bo Song,Ning Guo,Shengfeng Guo,Zhongwen Yao
An Al-containing ODS steel was coated with a composite Cr-AlN layer by pack-cementation treatment. Constituent phases and microstructures of the coating layer were carefully characterized. The results show that the Cr-layer is a Cr-Fe solid solution with {Cr,Fe} 2 N 1-x particles and Cr 2 C particles, while the AlN-layer is composed of AlN particles and α-Fe matrix. The formation of Cr 2 C and {Cr,Fe} 2 N 1-x particles in the Cr-layer is due to the drag effect of the strong carbide-forming element Cr on the carbon in ODS steel and nitridation reaction of NH 4 Cl and Cr, Fe, respectively. During high-temperature pack-cementation, N atoms in the air diffuse into the ODS steel substrate and react with Al in the steel under the catalytic action of yttria , resulting in the formation of the AlN particles. Due to the limited diffusion depth of N and the high nitrogen concentration in the surface layer, the density and size of AlN particles are distributed in a gradient. The particle size is small and high on the side of the Cr-layer, while the particles on the side near the substrate are coarse and low in density. The composite coating greatly improves the surface hardness and friction resistance of the ODS steel.
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APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Xian Li,Jiafeng He,Weilong Zhang,Lijun You,Jumei Li
A sandwich structured Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) magnetic nanosphere with Ag nanoparticles as an interim layer was fabricated with in situ deposition of Ag nanoparticles onto Fe 3 O 4 nanospheres and subsequent coating an outmost shell of mesoporous TiO 2 -ZrO 2 . As compared to Fe 3 O 4 /m(TiO 2 -ZrO 2 )/Ag with Ag nanoparticles as the outmost layer, unique Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) sandwich nanospheres possess higher efficient charge migration and larger specific surface area disclosed by the BET and photoelectrochemical characterizations, so they present improved photocatalytic activity toward Cr(VI) reduction. In addition, they have high thermal stability because mesoporous TiO 2 -ZrO 2 outmost shell could protect the interim Ag nanoparticles from damage and agglomeration at high temperature. Results showed reduction efficiency of Cr(VI) of Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) reached 98.4 % in 30 min, as 1.6 times as that of Fe 3 O 4 /m(TiO 2 -ZrO 2 )/Ag. The Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) still obtained 91.3 % and 87.9 % reduction ratio after calcination at 500 ℃ and recycling 5 times, respectively. The photocatalytic mechanism was also revealed by scavenger experiments and ERP analysis. This work provided a good example for further design and preparation of magnetic photocatalysts with high performance for the remediation of heavy metal pollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Na Wang,Qilin Liu,Bo Xie,Xuechun Huang,Dan Xiao
Cr(VI) pollution severely threatens the water environment and human health. One of the effective ways to solve this problem is to develop environmentally friendly and efficient adsorbents. This paper proposes a highly efficient Cr(VI) adsorbent based on tannic acid coating PVA/PVP/PEI nanofibrous membrane. The adsorbent is environment-friendly and has satisfying water stability and adsorption performance. The optimum preparation conditions, adsorption conditions, and the influence of ionic strength and coexisting ions were investigated comprehensively. Through the study of adsorption kinetics and isotherms, the adsorption of Cr(VI) on the nanofibrous membrane was found following the pseudo-second-order kinetics model, and the adsorption isotherm model following the Langmuir model. The maximum adsorption capacities were 631.97 mg/g, 667.52 mg/g, and 695.04 mg/g at 298 K, 308 K, and 318 K, respectively. After adsorption of Cr(VI), the membrane can be converted to high purity Cr 2 O 3 by calcination. The tannin-coated PVA/PVP/PEI nanofibrous membrane is a promising adsorbent because it can efficiently adsorb Cr(VI) and convert highly toxic Cr(VI) into hypotoxic Cr(III).
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