ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 411
·期 2
·537-544
·
IF 3.307
Ran Hui,Lin Zheng-Zhong,Yao Qiu-Hong,Hong Cheng-Yi,Huang Zhi-Yong
A facile and practical ratiometric fluorescence probe based on two CdTe quantum dots (QDs) coated with molecularly imprinted polymers (MIPs) was prepared for the detection of trace malachite green (MG) in fish. Two CdTe QDs coated with MIPs were fabricated by a one-pot method using MG, (3-aminopropyl) triethoxysilane (APTES) and tetraethyl orthosilicate (TEOS) as template, functional monomer, and cross-linker, respectively. CdTe QDs with λ em 530 nm (gQDs) and 630 nm (rQDs) were used as the referential fluorophore and target sensitive fluorophore, respectively. The fluorescence intensity of gQDs remained unchanged in the presence of MG, while the fluorescence of rQDs could be quantitatively quenched by MG based on the strategy of fluorescence resonance energy transfer. The ratiometric fluorescence probe (MIPs@gQDs&rQDs) was characterized by transmission electron microscopy and Fourier transform infrared spectroscopy. The linear range of MG detection was 0.1–32 μmol L −1 with a detection limit of 8.8 μg kg −1 . The constructed probe has been successfully applied to the detection of MG in fish with the recoveries of 92.3–109.1%, which were validated by the method of HPLC. The result indicated that the probe possessed rapid response, wide linear range, high sensitivity, and relatively high selectivity, and was low-cost and easy in operation in the detection of MG in fish samples.
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Environmental Progress & Sustainable Energy
·
2019
·Vol. 39
·期 4
·e13346
·
IF 1.596
Chunsheng Li,Dandan Liu,Xianqing Yang,Shengjun Chen,Jianchao Deng,Hui Rong,Chi Li
Biodegradation by microorganisms is a potential treatment technique of malachite green (MG) in aquaculture environments. In this study, a bacterium with high MG decolorization and biodegradation ability was isolated through enrichment culture and color-decoloration circle method, and was identified as Klebsiella pneumoniae WA-1 after molecular and biochemical identification. The MG biodegradation characteristics and the factors affecting the MG biodegradation ability of this strain were studied using KBH 4 reduction-high performance liquid chromatography with fluorescence detector (HPLC-FLD) method. K. pneumoniae WA-1 could efficiently biodegrade MG in aqueous solution without any nutrients that over 94.0% MG was biodegraded by this strain at 1–20 mg/L within 0.5 hr and 100% MG were biodegraded at 1–10 mg/L within 12 hr. Fairly stable MG biodegradation performance was observed in complex environments, including various pH, temperature, salinity, and metal ions, especially at low MG concentration. Furthermore, the presence of NaCl, Mn 2+ , Mg 2+ , or Cu 2+ could enhance the MG biodegradation ability of this strain. These results indicate that K. pneumoniae WA-1 could be used as a potential MG degradation agent in complex aquaculture environments.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Qin Hu,Qiuyan Mao,Yikun Cui,Shiyun Gong,Lixia Xiao,Xiaojuan Gong,Tianzhu Guan,Zhen-quan Yang
This work made the first attempt to construct a florescence assay based on CDs@FMs (carbon dots-based fluorescence microspheres) for ultrasensitively probing malachite green (MG). Through static quenching and inner filter effect (IFE), the 581-nm emission peak of CDs@FMs could be significantly suppressed by MG. Our results demonstrated two good linear fluorescence responses for MG in the concentration scopes of 0.01–0.1 μM and 0.1–10.0 μM, respectively. Strikingly, the detection limits (LODs) achieved were down to picometer (56.7 pM) and nanometer levels (0.57 nM). Furthermore, this method exhibited good consistency with the HPLC results when applied for quantitatively screening MG from fish samples. Our current research highlights a promising application of CDs@FMs for enhanced MG probing in aquatic products with the merits of rapidity, simplicity, high accuracy and stable signal readout.
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Journal of Environmental Chemical Engineering
·
2016
·
IF 0
Yufang Tang,Yongde Zeng,Tao Hu,Qiang Zhou,Yongzhen Peng
In this study, lignin sulfonate-based mesoporous materials (LSMMs) were prepared and applied for removal malachite green (MG) from aqueous solution. Lignin sulfonate- g -poly (acrylic acid- r -acrylamide) was prepared by grafting poly(acrylic acid- r -acrylamide) onto a lignin sulfonate molecule followed by crosslinking. N 2 adsorption/desorption indicated that the corsslinked lignin sulfonate- g -poly(acrylic acid- r -acrylamide) were mesoporous materials. The batch adsorption experiments of MG on LSMMs were carried out to evaluate the performance of the LSMMs. Results revealed that the maximum percentage adsorption of MG on the LSMMs is more than that of MG on the lignin sulfonate-based polymer without grafted copolymer with a maximum difference of 37% in the same adsorption conditions. pH, adsorbent dosage, initial MG concentration and temperature are just the parameters that could exhibit breathing effect to the adsorption process. The adsorption kinetics follows a pseudo-second-order kinetics, intra-particle diffusion is not the only rate-controlling step in the entire adsorption process, and the equilibrium adsorption data could be described well by the Langmuir isotherm equation. The adsorption process is endothermic, spontaneous and random. LSMMs can be used as low-cost adsorbent for refractory cationic organic dye in effluent.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yuting Zhang,Xinmiao Qi,Qiang Ma,Jie Li,Xin Guo,Jianzheng Qiao,Yiqiang Wu
Malachite green (MG), a synthetic dye widely used in industrial applications and aquaculture, poses significant health hazards due to its genotoxic and carcinogenic properties. Addressing these risks requires innovative methods for the efficient MG removal and sensitive detection. In this study, we developed a novel β-cyclodextrin/carbon dots-loaded cellulose nanofibrils/MIL-100(Fe) hydrogel (βCCM) for enhanced adsorption and fluorescence detection of MG. The βCCM demonstrated an exceptional maximum adsorption capacity of 1789 mg/g. Furthermore, βCCM exhibited bright orange fluorescence, which was significantly quenched upon exposure to MG through inner filter effect and static quenching. The fluorescence detection platform exhibited high sensitivity, with a limit of detection (LOD) of 0.09 μg/L and excellent linearity. Its practical applicability was validated through successful MG removal and detection in real water samples, achieving high recoveries and reproducibility. Mechanistic investigations revealed that the enhanced adsorption performance resulted from the incorporation of MIL-100(Fe) and the formation of a three-dimensional (3D) porous structure, which also stabilized the fluorescent signal and amplified detection sensitivity. This study highlights the effectiveness of βCCM for both MG adsorption and detection, presenting a novel strategy for designing advanced β-cyclodextrin-based hydrogels tailored for water treatment.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Zuyao Fu,Ze Chen,Lingfeng Yang,Hao Wang,Jing Xie,Zhaoyang Ding
The misuse of malachite green (MG) has led to significant water pollution, and its metabolite, leucomalachite green (LMG), poses a serious health risk. Rapid detection of drug residues in aquaculture is crucial for food safety. In this study, the dual-emission fluorescent sensor RhB@Tb-MOF (RhB = Rhodamine B) was synthesized based on fluorescence resonance energy transfer (FRET). MG significantly quenches the fluorescence of RhB and affects the fluorescence of Tb-MOF to different extents, making it a suitable ratiometric fluorescent sensor for sensitive MG detection with a limit of detection (LOD) of 9.6 × 10 −3 μg/mL. Although LMG did not affect the fluorescence of RhB@Tb-MOF, it formed a ratio with the fluorescence of RhB@Tb-MOF due to its intrinsic fluorescence properties, and the LOD was 3.5 × 10 −3 μg/mL. Additionally, increasing MG concentrations shifted the sensing system's color from pink to blue, with a colorimetric LOD of 0.15 μg/mL. This paper introduced a colorimetric/fluorescent dual-mode sensor for MG and LMG detection. Furthermore, this sensor was combined with smart labeling technology to achieve rapid on-site quantification of MG, offering significant potential for broad application.
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MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Jianli Tao,Meng Zhang,Xiang Gao,Hao Zhao,Zhenpeng Ren,Donghui Li,Jiaojiao Li,Ruiqin Zhang,Yonggang Liu,Yunpu Zhai
Co 3 O 4 /red phosphorus (Co 3 O 4 /RP) photocatalysts were synthesized via facile hydrothermal and mechanically grinding approach. The catalysts were characterized via XRD , TEM , XPS , N 2 sorption , photoelectro chemical measurements and UV–vis DRS . The results showed that the Co 3 O 4 nanocrystals were assembled on the surface of the RP. The loading of Co 3 O 4 on RP was beneficial to enhance the light absorption compared with pure RP. Under visible light , 94.5% of malachite green (MG) can be photodegraded within 20 min over 10% Co 3 O 4 /RP composite, while only 17.3% and 59.9% of MG can be photodegraded over pure Co 3 O 4 and RP. The reaction rate constant k obtained over 10% Co 3 O 4 /RP heterojunction (0.1464 min −1 ) is approximately 3.2 times that of pure RP (0.0457 min −1 ), and 15.3 times that of bare Co 3 O 4 (0.0096 min −1 ). The cycle experiments showed that the catalyst had high photocatalytic stability. Co 3 O 4 nanocrystals inhibit the photoelectron-hole pair recombination of red phosphorus semiconductor, and exhibit improved visible light absorption . Consequently, the catalytic performance of Co 3 O 4 /RP has been enhanced under visible light .
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SEPARATION SCIENCE AND TECHNOLOGY
·
2016
·
IF 1.083
Zhengzhong Lin,Dan Wang,Hongyuan Zhang,Lu Li,Zhiyong Huang,Jianxiong Shen,Yuhui Lin
Molecularly imprinted polymers (MIPs) were synthesized using malachite green (MG) as template, and methacrylic acid/sodium methacrylate as composite monomers. The equilibrium dissociation constant and apparent maximum adsorption capacity of the MIPs reach 12.2 mg·L−1 and 3.2 mg·g−1, respectively. The MIPs demonstrate excellent recognition ability due to high-affinity sites constructed by the electrostatic interaction and hydrogen bonds between template and composite monomers. The MIPs were successfully employed for the detection of MG residue in aquatic products coupled with high-performance liquid chromatography (HPLC) with a detection limit of 0.57 μg·kg−1.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Xiaodong Yang,Zhiyong Hou,Xuefei Yang,Minghui Li,Yuanxia Guo,Kai Wang,Shuaiqi Luo,Jin Zhao,Pengkai Sun,Qiang Yang,Rui Chen,Yan Yan,Lulu Liu,Lili Wang,Ye Han,Fanming Zeng,Andrew R. Zimmerman,Bin Gao
New efficient and sustainable methods for the removal of malachite green (MG) from environmental media are needed. In this study, corn straw was co-pyrolyzed with montmorillonite under a variety of conditions (400, 500, 600, and 700 °C and 10–40 wt% montmorillonite), without any use of toxic chemicals, to produce a series of biochar-clay composites. Characteristics of the composites that make them promising contaminant sorbents include a uniform lamellar-particle micromorphology, enhanced mesoporous structure and surface area (53.0 m 2 g −1 ), and abundant and diverse oxygen/carbon-containing functional groups (i.e., O-H, C-O, C=C, and C-H). The composite produced at 600 °C and 10 wt% montmorillonite had the highest observed MG removal from aqueous solution (6572.1 mg g −1 , 99.6% removal rate). Adsorption of MG by the sorbent was attributed to multiple sorption mechanisms, including physical interaction, cation exchange, and π-π bonding interactions, and was modulated by intra-particle diffusion. This work highlights the potential of corn straw biochar-montmorillonite composites as a favorable adsorbent for environment remediation and water treatment.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2026
·Vol. 28
·期 1
·12
·
IF 2.6
Fu Qiuping,Zha Lei,Wang Jialin,Hu Jing,Wu Pan,Xiao Bin
The development of high-capacity and easily separable adsorbents is crucial for efficient dye wastewater treatment. Herein, a magnetic Fe 3 O 4 @ZIF-67 nanocomposite was synthesized via a facile in situ method to enhance its separation and recovery capabilities. The characterization results confirmed the successful synthesis of this nanocomposite. The batch adsorption experiments demonstrated that its adsorption capacity reached as high as 949.5 mg·g −1 . This process can be well described by the Langmuir and pseudo-second-order models, indicating it is a single-layer chemical adsorption. The thermodynamic studies revealed the adsorption to be spontaneous and endothermic. This work not only presents Fe 3 O 4 @ZIF-67 as a highly efficient and recyclable adsorbent for malachite green (MG) but also validates the strategy of constructing magnetic MOF-based composites for practical environmental remediation.
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Nanomaterials
·
2025
·Vol. 15
·期 11
·850
·
IF 4.3
Liying Wen,Fangfang Cheng,Xinyu Zhao,Lin Han,Dongye Zhao,Shifeng Wang
Wastewater containing triphenylmethane dyes such as malachite green (MG), discharged by textile and food industries, poses significant carcinogenic risks and ecological hazards. Conventional physical adsorption methods fail to degrade these pollutants effectively. To address this challenge, we focused on two-dimensional SnSe2semiconductor materials. While their narrow bandgap and unique structure confer exceptional optoelectronic properties, prior research has predominantly emphasized heterojunction systems. We synthesized SnSe2with well-defined hexagonal plate-like structures via a one-step hydrothermal method by precisely controlling precursor ratios (Sn:Se = 1:2) and reaction temperatures (120–240 °C). Systematic investigations revealed that hydrothermal temperature modulates the van der Waals forces between crystal planes, enabling selective exposure of (001) and (011) facets, as confirmed by XRD, SEM, and XPS analyses, thereby influencing the exposure of specific crystal facets. Experiments demonstrated that pure SnSe2synthesized at 150 °C achieved complete degradation of MG (40 mg/L) within 60 min under visible light irradiation, exhibiting a reaction rate constant (k) of 0.099 min⁻¹. By regulating the exposure ratio of the active (001)/(011) facets, we demonstrate that crystal facet engineering directly optimizes carrier separation efficiency, thereby substantially enhancing the catalytic performance of standalone SnSe2. This work proposes a novel strategy for designing noble-metal-free, high-efficiency standalone photocatalysts, providing crystal facet-dependent mechanistic insights for the targeted degradation of industrial dyes.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Saleem Raza,Xiaolan Wu,Qianqian Liu,Pengfei Zhang,Pei Zhang,Xiaoxian Su,Prabhu Sengodan,Yasin Orooji,Rui Zhang
The synergistic integration of photocatalytic nanomaterials with hydrogel matrices has emerged as a promising strategy for sustainable wastewater treatment due to their biocompatibility, stability, and cost-effectiveness. In this study, a multifunctional hydrogel was fabricated through a green synthesis route by embedding Fe₃O₄@VO₂–polydopamine (PDA) composites into a sodium alginate (SA) network via a two-step cross-linking process. Fe₃O₄ nanoparticles were synthesized by co-precipitation, followed by water bath growth of Fe₃O₄@VO₂ and in situ PDA deposition to improve interfacial stability and charge transfer. The resulting Fe₃O₄@VO₂-PDA-SA/H hydrogel exhibited excellent magnetic recoverability, high photocatalytic efficiency, and structural robustness. Malachite green (MG) and tetracycline hydrochloride (TCH), representative contaminants from aquaculture wastewater, were employed as target pollutants. The composite achieved maximum photodegradation efficiencies of 98.39 % for MG and 87.03 % for TCH, with only moderate efficiency loss after five consecutive cycles (retaining 88.38 % and 61.03 % removal, respectively). Radical quenching experiments revealed that •OH and •O₂ − played dominant roles in pollutant degradation, confirming a synergistic photocatalytic mechanism. These findings demonstrate that Fe₃O₄@VO₂-PDA-SA/H not only ensures efficient and stable photocatalysis in complex aqueous environments but also offers facile recyclability, highlighting its potential as a practical material for advanced wastewater remediation.
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