SURFACE & COATINGS TECHNOLOGY
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2024
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IF 5.3
Xu Chuanqin,Zeng Zhikang,Li Xiaoya,Chen Tianyi,Peng Shusen,Ma Yongcun
The role of additives in surface treatments is pivotal for enhancing the functionality and performance of coatings. While the impact of additives on the functionality and performance of various types of coatings has been mechanistically investigated, the specific influence of additives on the durability of chromate-phosphate conversion coatings remains less understood. This study introduces a novel Cr(III) complex dye, which significantly improves the long-term durability of such coatings. Through comprehensive experimentation, it is demonstrated that the application of this dye markedly influences the morphology, chemical composition, element distribution, and modulus of the conversion film, with negligible effects on the film thickness. The paramount effectiveness of the dye is predominantly realized through the mitigation of bound water in the conversion film and the formation of a more stable structure via interaction with phosphate ions. This work contributes to the nuanced understanding of additive-coating interactions, highlighting the potential of specific chemical agents in advancing the durability of protective coatings.
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Journal of Water Process Engineering
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2026
·
IF 6.6
Feifei Xia,Shudong Ye,Jinjin Zhang,Jinhua Wu
Chromium-contaminated soil remediation via bioleaching generates wastewater containing persistent organic-Cr(III) complexes, which pose significant challenges during the post-treatment process. This study developed an innovative ternary synergistic system integrating mixed heterotrophic/autotrophic denitrifying bacteria with zero-valent iron (Fe 0 ) for promoted organic-Cr(III) removal and stabilization. In the nitrate-modulated biotic-Fe 0 (NMB Fe 0 ) system, heterotrophic bacteria mediated organic acid degradation, resulting in Cr(III) ion liberation. Concurrently, autotrophic bacteria utilized cathodic hydrogen from iron corrosion to accelerate both Fe 0 corrosion and secondary mineral production (e.g., magnetite and green rust) for subsequent Cr(III) adsorption and immobilization. The integrated system achieved 78.5% organic-Cr(III) removal in 5 d, representing a 6.7-fold enhancement as compared to the abiotic-Fe 0 control. Statistical analysis revealed significant positive correlations between nitrate concentration, Fe 0 dosage, and removal efficiency within the biological adaptation range, confirming denitrification as the primary driving mechanism. Leaching toxicity and reoxidation assessments demonstrated superior environmental stability of immobilized Cr(III) by NMB Fe 0 . Mechanistic investigations indicated that the synergistic interplay between heterotrophic and hydrogen-autotrophic bacteria effectively inhibited both organic-Cr(III) complexation and Fe Cr passivation layer formation on Fe 0 surface. These findings provide a novel, efficient, and sustainable strategy for bioleaching wastewater treatment.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Brian Musikavanhu,Yujie Zhang,Dongwei Zhu,Zhaoli Xue,Rui Yuan,Shengjun Wang,Long Zhao
A thiophene substituted naphthyl hydrazone derivative NHT was synthesized using a one-step route for the detection of trivalent chromium (Cr 3+ ). UV–visible absorption and emission spectra, density functional theory calculations as well as 1 H NMR titration confirmed that the probe underwent a turn-off response via the chelation enhanced fluorescence quenching effect upon exposure to Cr 3+ and the NHT -Cr 3+ complex was formed at a 1:1 binding stoichiometry. NHT exhibited a fast response rate of 2.3 min in buffer solution and a relatively low limit of detection of 41 nM. In addition, the Schiff base chemosensor exhibited excellent selectivity with high affinity towards Cr 3+ in the presence of other competing cations. Bioimaging of the probe in PC3 cells further demonstrated the potential real life application of the probe in detecting Cr 3+ .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
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IF 8.2
Peiyuan Xiao,Junqing Xu,Hongliang Shi,Fengyang Du,Huanzheng Du,Guangming Li
The simultaneous reduction of Cr(VI) and sequestration of the resulting Cr(III) in one process is highly desirable as a cost-effective and environmental-friendly approach for the decontamination of Cr(VI)-polluted wastewater. However, most of the existing adsorptive materials are only effective in low pH environments (pH = 1–3), severely restricting the adsorption efficiency and cost effectiveness. Herein, we proposed a chitosan-based magnetic porous microsphere (PPy@PMCS) for simultaneous Cr(VI) reduction and Cr(III) sequestration in a wide pH range. Benefiting from its abundant interaction sites, Cr(VI) was effectively adsorbed on the surface and then immediately reduced to Cr(III) with much lower toxicity. Most importantly, the resulting Cr(III) was in-situ sequestrated by the complexation of chitosan matrix. As a result, PPy@PMCS exhibited a maximum Cr(VI) adsorption capacity of 330.42 mg/g at pH 2.0 and an adsorption capacity of 167.82 mg/g even at near neutral pH (6.0), which is superior to most reported adsorbents. Furthermore, the exhausted PPy@PMCS can be rapidly separated from solutions under an external magnetic field and facilely regenerated. The proposed novel biopolymer-based material shows great application potentials in wastewater treatment.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2015
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IF 2.752
Xiaokun Wang,Yingqin Wei,Shasha Wang,Lingxin Chen
In this work, a simple “red-to-blue” colorimetric method for highly sensitive and selective determination of Cr (III) and Cr (VI) was presented, which was based on the aggregation of Tween 20-stabilized gold nanoparticles (Tween 20-Au NPs). This strategy relied upon the distance-dependent optical properties of gold nanoparticles (Au NPs), strong chelating between Cr (III) and citrate, and the reduction of Cr (VI) to Cr (III) by ascorbic acid (AA). Cr (III) could chelate with citrate to form a stable Cr (III)-citrate complex and thereby induce the aggregation of Tween 20-Au NPs. Thus, the sensing of Cr (III) and Cr (VI) based on aggregation of Au NPs was developed with the color of the Au NPs changing from red to blue, which was readily seen by the naked eye. The color change and surface plasmon resonance (SPR) absorption were used to monitor Cr (III) and Cr (VI) levels. Under the optimal assay conditions, good linear relationship was obtained, and the detection limit of Cr (III) and Cr (VI) were 0.016 μM and 0.009 μM in standard aqueous solution, respectively. Furthermore, the colorimetric method exhibited a good selectivity over other metal ions and was successfully applied to detect Cr (III) and Cr (VI) in real water samples.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2016
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IF 3.976
Zunwei Chen,Shufang Song,Yuezhong Wen
The priority pollutant chromium (Cr) was ubiquitous and great efforts have been made to reduce Cr (VI) into less-toxic Cr (III) by alga for the convenient availability and low expense. However, the functional role of organelle inside the algal cell in Cr (VI) reduction was poorly understood. In this study, organelles in green algae Chlorella vulgaris were extracted and further decorated for Cr (VI) reduction tests. Results showed that the chloroplast exhibited not only adsorption ability of total Cr (21.18% comparing to control) but also reduction potential of Cr (VI) (almost 70% comparing to control), whose most suitable working concentration was at 17 μg/mL. Furtherly, the isolated thylakoid membrane (ITM) showed better Cr (VI) reduction potential with the presence of sodium alginate (SA), even though the Hill reaction activity (HRA) was inhibited. As for photosystem II (PSII), the addition of mesoporous silica SBA-15 enhanced the reduction ability through improving the light-harvesting complex (LHC) II efficiency and electron transport rate. On the whole, the reduction ability order of the three kinds of materials based on chloroplast in C. vulgaris was PSII@SBA-15 > Chloroplast > ITM@SA. The attempt made in this study to reduce the Cr (VI) with C. vulgaris organelles might not only offer basement to detect the potential action mechanism of Cr (VI) reduction by C. vulgaris but also provide a new sight for the scavenge of heavy metal with biological materials.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 8
·1-12
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IF 5.3
Ruan Ya,Li Qiulan,Yang Dezhi,Yang Yaling
Copper selenide nanoparticles (CuSeNP) were synthesized using histidine, ethylenediamine, and sodium selenate as precursors by one-step microwave digestion methods. The as-prepared CuSeNPs exhibit excellent catechol oxidase mimic enzyme and catalase (CAT)-like activities. Dopamine (DA) can be oxidized to aminochrome with H 2 O 2 by CuSeNPs, and the intermediate product aminochrome can further react with α -naphthol to yield a highly fluorescent derivative. It was confirmed that Cr(III) could adsorb on the surface of CuSeNPs and inhibit the production of semiquinone radicals in the reaction system, and the catalytic activity of CuSeNPs was inhibited. The detection mechanisms, kinetics, and catalytic properties of CuSeNPs were systematically investigated. As a result, a novel fluorescence method for the assay of Cr(III) was established. The feasibility of CuSeNP nanozyme in detecting speciation Cr(III) in food samples was explored with satisfactory results. It showed the obvious potential for developing effective and dependable fluorescent detection method for protecting food safety. Graphical Abstract
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 7
·1-11
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IF 6.232
Guo Hao,Wu Ning,Xue Rui,Liu Hui,Wang Mingyue,Yao Wenqin,Wang Xiaoqiong,Yang Wu
An Eu(III)-functionalized strontium-organic framework (Eu 3+ @Sr-MOF) was synthesized by encapsulating Eu 3+ ions into the pores of Sr-MOF via postsynthetic modification (PSM) and fully characterized by XRD, SEM, EDS, FTIR, and TGA. The luminescent properties of Eu 3+ @Sr-MOF were measured and investigated in detail, which demonstrated that Eu 3+ @Sr-MOF not only possessed excellent water and chemical stabilities in a wide pH range (5–10) but also displayed red luminescence with excitation/emission maxima at 332/617 nm. The Eu 3+ @Sr-MOF can be considered as a highly selective and sensitive recyclable luminescence probe for sensing Cr(III) and Cr(VI) based on strong luminescence quenching effects; it can be recycled at least five times. The luminescence probe for Cr 3+ , CrO 4 2− , and Cr 2 O 7 2− shows low detection limits (0.15 μM, 0.17 μM, and 0.13 μM, respectively), relatively broad linear ranges (0.6–150 μM, 0.1–200 μM and 0.4–180 μM, respectively), and high quenching constants K SV . The signals can be observed by the naked eye under UV light of 365 nm. The method was applied to the determination of total Cr in environmental water samples.
Graphical abstract
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Industrial Chemistry & Materials
·
2025
·
IF 11.9
Huiyao Huang,Shiquan Zhong,Yawen Chen,Wangquan Gong,Changshen Ye,Jie Chen,Ting Qiu
The semiconductor manufacturing industry imposes stringent requirements on the metal ion content of photoresist resin monomers. Tris(2-carboxyethyl) isocyanurate (H3tci), a critical raw material for photoresist resin monomers, inevitably incorporates metal ions during production. However, its inherent carboxyethyl groups form stable coordination complexes with Cr(III), hindering the semiconductor-grade resin monomer production. To achieve the ultra-deep removal of Cr(III) at ultra-trace concentrations, inspired by the Hard-Soft-Acid-Base theory, we systematically modulated the electron-rich sulfonic acid group on polymers via controlled sulfonation conditions to achieve a novel series of adsorption materials (St) with ultra-high Cr(III) adsorption affinity. The adsorption-recrystallization process using our St-V-15, which exhibited the benchmarked distribution coefficient (Kd) of 1.01×108 mL g-1, could reduce Cr(III) concentration in H3tci from 840 ppb to 24.3 ppb. Furthermore, St-V-15 exhibited a maximum adsorption capacity calculated using the Langmuir model of 126 mg g-1 and a rapid initial adsorption rate of 13.58 mg g-1 min-1 at 298 K. Additionally, St-V-15 demonstrated exceptional selectivity for Cr(III) over competing ions (e.g., K(I), Mg(II), Na(I) and Zn(II)) and maintained stable performance over at least 5 adsorption-desorption cycles. The superior performance originated from the chelation between Cr(III) and the sites of O atoms (S-O and S=O) combined with the electrostatic interaction between deprotonated sulfonic acid groups and Cr(III). These results position St-V-15 as a promising adsorption material for ultra-trace Cr(III) removal in H3tci, offering a cost-effective solution for semiconductor-grade resin monomer production for the very first time.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.1
Jinxin Ma,Jieping Zheng,Jiangyao Chen
The rapid, on-site quantification of trivalent chromium (Cr(III)) is crucial for environmental risk assessment, yet conventional analytical methods are severely hampered by their reliance on bulky instrumentation. To address this challenge, we report a portable, dual-mode colorimetric sensing platform centered on the specific interaction between Cr(III) and α-sulfophenylacetic acid-functionalized silver nanoparticles (D-SFA-AgNPs). This interaction triggers the controlled aggregation of nanoparticles, resulting in a distinct yellow-to-gray color change and a significant red-shift in the localized surface plasmon resonance (LSPR) spectrum. To fully leverage this optical response, a low-cost, Arduino-based smart analyzer was engineered, integrating a Red-Green-Blue (RGB) colorimetric mode for rapid screening and a multi-channel spectral mode for trace analysis. Under optimized conditions, the platform achieved a rapid response (< 1 min) with a linear dynamic range of 0.033–100 μg L −1 . The limit of detection (LOD) was determined to be 4.60 μg L −1 , which is significantly lower than the World Health Organization (WHO) guideline for drinking water (50 μg L −1 ). Furthermore, analytical validation in real water samples demonstrated excellent spike recoveries (97.6%–107.6%) and high precision (RSD < 5.9%), showing high consistency with the gold-standard inductively coupled plasma-mass spectrometry (ICP-MS) method. Consequently, by synergizing the Arduino-based open-source hardware with dual-mode sensing, this work provides a cost-effective solution for the point-of-need monitoring of Cr(III), holding great potential for environmental surveillance even in resource-limited areas.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Dashi Lei,Chunli Gou,Chunli Wang,Juanqin Xue,Zhongshen Zhang,Weizhen Liu,Zhang Lin,Jing Zhang
The reduced chromite ore processing residue (rCOPR) deposited in environments is susceptible to surrounding factors and causes reoccurrence of Cr(VI). However, the impact of natural sunlight on the stability of rCOPR is still unexplored. Herein, we investigated the dissolution and transformation behaviors of Cr(III)–Fe(III) hydroxide, a typical Cr(III)-containing component in rCOPR, under visible light. At acidic conditions, the release rate of Cr(III) under illumination markedly increased, up to 7 times higher than that in the dark, yet no Cr(VI) was produced. While at basic conditions, only Cr(VI) was obtained by photo-oxidation, with an oxidation rate of ∼7 times higher than that by δ-MnO2 under dark conditions at pH 10, but no reactive oxygen species was generated. X-ray absorption near-edge structure and density functional theory analyses reveal that coexisting Fe in the solid plays a critical role in the pH-dependent release and transformation of Cr(III), where photogenerated Fe(II) accelerates Cr(III) produced at acidic conditions. Meanwhile, at basic conditions, the production of intermediate Cr(III)–Fe(III) clusters by light leads to the oxidation of Cr(III) into Cr(VI) through the nonradical “metal-to-metal charge transfer” mechanism. Our study provides a new insight into Cr(VI) reoccurrence in rCOPR and helps in predicting its environmental risk in nature.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Jianting Liu,Yicong Chen,Shuyu Jiang,Jianhui Huang,Yuancai Lv,Yifan Liu,Minghua Liu
A cellulose-g-poly-(acrylamide-co-sulfonic acid) polymeric bio-adsorbent (CASA) was prepared by grafting copolymerization, and used to adsorb Cr(III) from leather wastewater. The SEM, XRD, FTIR , and XPS results showed that CASA contains many spherical particles and functional groups such as NH 2 , C O, and HSO 3 . The adsorption experiments revealed that CASA presented excellent adsorption performance for Cr(III) (274.69 mg/g of max adsorption capacity) from high-salinity wastewater, which was much better than other reported adsorbents with different structures. Meanwhile, adsorption equilibrium could be reached within 10 min due to the introduction of abundant sulfonic acid groups on its surface. In addition, the adsorption process followed the Langmuir adsorption isotherm , and the experimental data conformed to the pseudo-second-order kinetics model . Moreover, the main adsorption mechanisms include chelation, electrostatic interactions , and cation exchange , which provide an important theoretical basis for the removal of toxic inorganic pollutants from leather wastewater.
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