CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2020
·Vol. 36
·期 6
·1272-1278
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IF 1.063
Li Ying,Pan Bo,Miao Hongyan,Xu Humin,Liu Xuefeng,Shi Gang
The present work was mainly focused on the single and binary adsorption of methylene blue(MB) and methyl orange(MO) from alcohol aqueous solution over rice husk based activated carbon(RHAC). The study of single dye adsorption equilibrium experiments found that the Langmuir adsorption model was consistent with the adsorption behavior of RHAC on MB and MO, indicating that it was a single layer adsorption. The adsorption behavior conformed to the pseudo-second-order kinetic model. The binary dye adsorption experiments showed that the Langmuir-Freundlich model could be applied to describe the adsorption behavior of RHAC on MB and MO. Comparation with the single dye system, the adsorption capacity on the binary dye system was larger, and there was “competitive adsorption” and “synergistic adsorption” effects existed. Meanwhile, the pseudo-second-order kinetic model also fit for the binary dye adsorption behavior.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Shumei Zhao,Yingqing Zhan,Qingying Feng,Wei Yang,Hongyu Dong,Ao Sun,Xin Wen,Yu-Hsuan Chiao,Shirui Zhang
Fabrication of highly efficient adsorption and easy-handling absorbent is promising for removal of dyes from wastewater, but it was still a big challenge. In this study, a novel polymer nanofibrous composite absorbent was designed by the decoration of acidified MWCNTs on polydopamine-modified poly(arylene ether nitrile) nanofibrous membrane and following co-deposition of tannic acid/carboxylated chitosan. The structure and composition of as-prepared nanofibrous composite absorbent were confirmed by SEM, FTIR, XPS , and TGA . The congo red (CR) and methylene blue (MeB) were applied as probe dyes to evaluate the adsorption capacity of nanofibrous composite absorbent (With the average pore diameter of 19.21 nm) for cation and anion dyes. It was found that the adsorption capacity of MeB and CR at the optimum pH could reach 633 and 589 mg/g in 300 min, respectively. The adsorption process of MeB and CR followed the Langmuir adsorption model and pseudo-second-order model. Moreover, the nanofibrous composite absorbent exhibited easy-handling property and good regeneration ability, showing the potential application for the efficient adsorption of various dyes from wastewater.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Aowei Lv,Xue Lv
Anthropogenic wastewater generation and water pollution can have negative impacts on public health and ecosystems. However, most materials do not have both adsorptive and catalytic properties, so the design and development of sustainable and multifunctional materials is essential for wastewater treatment. Herein, composite hydrogel (PHG) containing [2-(Methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl) ammonium hydroxide (SBMA) and chitosan quaternary ammonium salts (HACC) were prepared for wastewater treatment. The adsorption capacities of the PHG hydrogels for nickel (Ni II ), copper (Cu II ), and palladium (Pd II ) ions were 158.68, 182.99, and 229.78 mg/g, respectively. The adsorption process is consistent with the Langmuir adsorption model and quasi-secondary kinetics. For further application of adsorbed metal ions, NaBH 4 was selected for in situ reduction to prepare hydrogel-based catalysts cemented with metal nanoparticles (Ni-, Cu- and Pd-NPs), respectively. The PHG-Pd catalysts demonstrated significant catalytic efficiency in reducing 4-nitrophenol and methylene blue, and K app were 0.307 and 0.365 min −1 , respectively. Among them, the activation parameters for the reduction of 4-NP over PHG-Pd catalyst were calculated as E a = 36.27 kJ/mol, ΔH # = 33.72 kJ/mol and ΔS # = −259.68 J/(mol·K). This study is expected to provide insights into the design of multifunctional adsorption catalysts for the removal of dyes and nitro compounds from wastewater.
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JOURNAL OF MOLECULAR STRUCTURE
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2025
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IF 4.7
Guohui Chen,Minghua Li,Youmei Chen,Qin Zhu,Ya Yan,Xiaoyun Pu
CuInS 2 (CIS) was synthesized via a thermal injection method. Subsequently, different amounts of hydroxylated multi - walled carbon nanotubes (HMWCNTs) were incorporated into CIS through an in - situ growth method to fabricate HMWCNTs/CIS composites. The visible light photocatalytic activity of CIS and HMWCNTs/CIS was assessed using methylene blue (MB) and gaseous formaldehyde as model pollutants. Experimental results reveal that controlled incorporation of HMWCNTs into CIS markedly improves the composite's photocatalytic activity for both methylene blue (MB) degradation and gaseous formaldehyde (HCHO) removal. The optimal amount of HMWCNTs introduced was 1%. At this optimal ratio, 75% of the degradation efficiency of MB (80 mL of 10 mg/L) was achieved over 20 mg of HMWCNTs/CIS. Compared with CIS, the degradation efficiency of MB was increased by 25% (λ>420 nm). Regarding the gaseous pollutant formaldehyde, under this optimal ratio, a degradation efficiency of 96% was achieved within 2 h. The enhancement of the visible light photocatalytic activity of HMWCNTs/CIS can be attributed to the incorporation of HMWCNTs, which not only improves the visible light absorption of CIS but also facilitates the migration of photogenerated electrons, suppresses the recombination of photogenerated electron-hole pairs, and significantly enhances the photocatalytic performance of CIS. Moreover, the incorporation of HMWCNTs alters the predominant active species in the CIS system for MB degradation, shifting from hydroxyl radicals (⋅OH) and photogenerated electrons (e⁻) to photogenerated holes (h⁺) and hydroxyl radicals (⋅OH).
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Materials Today Communications
·
2025
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IF 4.5
Yin-Xia Sun,Li-Ping Liu,Ai-Ping Luo,Qin-Shu Li,Yu Sun,Zhe-Peng Deng,Wan-Hong Sun,Geng Guo
A new anionic Ce-MOF ([CeL(CHOO - )]·(CH 3 ) 4 N + )) based on ligand H 3 L (2,4,6-tris(4-carboxyphenyl)-1,3,5-triazine) was successfully synthesised and its adsorption properties of organic dyes were deeply investigated. Due to its unique pore structure and anionic skeleton, Ce-MOF exhibits excellent adsorption capacity for cationic dyes such as methylene blue (MB), crystal violet (CV) and rhodamine B (RhB), while it has no adsorption effect on anionic dyes such as methyl orange (MO) and methyl red (MR). The adsorption kinetics and isothermal model of Ce-MOF were systematically investigated using methylene blue as a model, and it was found that the adsorption process conformed to the quasi-primary kinetic model and the Langmuir isothermal model, indicating monomolecular layer adsorption. After five cyclic adsorption experiments, Ce-MOF maintained efficient adsorption performance, showing excellent cyclic stability and structural integrity. In the selective adsorption experiment of mixed dyes, it was found that cationic dyes can be adsorbed by Ce-MOF, and small molecule cationic dyes have a faster adsorption rate than large molecules. In addition, through DFT theoretical calculations, we revealed the adsorption mechanism of Ce-MOF on cationic dyes, which provided a theoretical basis for the design of new and efficient adsorption materials. This study not only provides an effective strategy for the removal of organic dyes, but also opens up a new way for the application of MOF materials in environmental treatment.
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Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Zhewen Shao,Kexin Xiang,Shuchang Liu,Feng Hong,Ye Gao,Enhong Lei,Jinping Jia,Yingping Huang
Presently, fast degradation of organic wastewater has been achieved by the synergetic method of hydrodynamic cavitation and H2O2 at a laboratory scale, while the physico-chemical effect, especially the turbulence characteristics on the degradation process remains lacking. This paper presents investigation on the degradation of dyeing wastewater containing methylene blue (MB) under neutral condition, within a vortex-based hydrodynamic cavitation (VBHC) reactor. Operating conditions are firstly optimized and then used to collaborate with H2O2 to study the synergetic effects of this hybrid treatment method. The turbulence characteristics are subsequently obtained by a computational fluid dynamics (CFD) simulation, and the correlation between them and the degradation process of MB is revealed. The results indicate that the highest degradation rate of 91.95 % is achieved under optimal conditions. Higher inlet pressure (4.5 bar) owns the thickest vapor volume fraction, greatest vapor transfer rate, and largest size of cloud cavity in the vortex core region, indicating the strongest cavitation intensity; meanwhile, moderate solution temperature (30 ℃) also favors for the greatest cavitation intensity inside the reactor. The optimal cavitation intensity activates the considerable production of reactive oxygen species, and results in good consistency with the MB degradation performance, which predominately occurs in the annular region around the vortex rope. This research unveils the rationale behind the physical essences of the VBHC process and its influence on the degradation efficacy of MB, which can provide reliable guidance for further development of cavitational reactors to degrade organic pollutants by the VBHC/H2O2 hybrid treatment method.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Mingzhen Wang,Yanhui Li,Mingfei Cui,Meixiu Li,Wenshuo Xu,Liubo Li,Yaohui Sun,Bing Chen,Kewei Chen,Yang Zhang
The phenomenon that calcium alginate does not exhibit high adsorption capacity as a carrier material has not been reasonably explained or solved. In this paper, a new viewpoint that the orbital energy level of metal ions and the binding degree of the α-l-guluronate and β-d-mannuronate units affect the adsorption performance of the composite was innovatively proposed. Taking barium alginate (BA) as an example, the possibility of replacing calcium alginate is discussed. Barium alginate/graphene oxide (BA/GO) membranes and three-dimensional (3D) barium alginate-bentonite-graphene oxide derived (3D-BA) hydrogels were prepared by vacuum freeze-drying to remove methylene blue . The structure and morphology of the prepared adsorbents were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, thermogravimetry and Fourier transform infrared spectroscopy . The effects of adsorbent dosage, doping ratio, temperature, contact time, pH value and initial dye concentration on the adsorption performance of BA composites were investigated. The adsorption capacities of the BA/GO and 3D-BA materials were 1011.3 and 710.3 mg/g, respectively. The BA/GO membrane exhibited stable filtration performance against high concentrations of dyes. Benefiting from the strong interaction between bentonite , sodium alginate and Ba 2+ , the 3D-BA hydrogel showed higher thermal stability and better adsorption efficiency than other materials. The Elovich kinetic model and Sips equation can appropriately describe the adsorption process . The results show that barium alginate is a better carrier material than calcium alginate.
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CHEMICAL ENGINEERING SCIENCE
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2025
·
IF 4.3
Ying Liu,Jiao Jiao,Qing-Yan Gai,Yu-Jie Fu,Yi-Bo Qiu,Yuan Wang
The extensive use of refractory organic dyes in the textile, printing, paper, food, and pharmaceutical industries is a significant source of water pollution. In this study, a novel magnetic hollow porous copper-based Fenton-like catalyst using cattail sporopollenin as a skeleton support (CSp/Fe 3 O 4 -Cu 2 O) was developed for the first time for the adsorption and efficient degradation of two refractory organic dyes rhodamine B and methylene blue in aqueous environments. Under the optimal conditions, CSp/Fe 3 O 4 -Cu 2 O showed complete ability to degrade the mixed dyes. The degradation kinetic constant of CSp/Fe 3 O 4 -Cu 2 O increased by 10.57 times compared to the control Fe 3 O 4 -Cu 2 O. The hollow porous structure of cattail sporopollenin (CSp) in CSp/Fe 3 O 4 -Cu 2 O not only adsorbed the dyes, but also promoted the continuous generation of active species by facilitating the redox cycling of Cu 2+ /Cu + through the adsorption of Cu 2+ , which synergistically realized the efficient degradation of mixed dyes. Furthermore, CSp/Fe 3 O 4 -Cu 2 O showed promising application potentials as follows: degradation rates of over 96 % for mixed dyes in a wide pH range of 3.0–11.0; complete degradation of mixed dyes in various water matrices including ultrapure water, tap water, and Songhua River water; and degradation rates of over 98 % for mixed dyes after six consecutive cycles. Overall, the novel Fenton-like catalyst CSp/Fe 3 O 4 -Cu 2 O developed in this study was found to be highly promising for the treatment of organic dye-contaminated water in chemical industries. This study also provided new insight into using the excellent adsorption properties of natural sporopollenin for the Fenton-like catalytic degradation of organic pollutants.
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Desalination and Water Treatment
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2024
·
IF 1
Abdelazeem S. Eltaweil,Eman M. Abd El-Monaem,Ahmed M. Omer,Randa E. Khalifa,Mona M. Abd El-Latif,Gehan M. El-Subruiti
MIL-101(Fe) iron-benzene dicarboxylate based metal-organic framework (MOF) was synthesized via a solvothermal method for adsorptive removal of cationic methylene blue (MB) dye from aqueous solution. The prepared MIL-101(Fe) was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, thermal gravimetric analyzer, X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller analysis tools. Various parameters affecting the removal efficiency were deliberated such as pH medium, contact time, solution temperature, MOF dosage, and initial MB dye concentrations. Results showed that MIL-101(Fe) has a maximum adsorption capacity of 58.82 mg/g at pH 9. Moreover, data obtained from isotherm studies were more fitted to the Langmuir isotherm model (R 2 = 0.997), while the adsorption kinetics followed the pseudo-second-order model. The thermodynamic studies proved that the adsorption process of MB dye onto MIL-101(Fe) was spontaneous and endothermic. Besides, MIL-101(Fe) showed higher adsorption ability towards cationic MB dye compared to the anionic methyl orange dye. Finally, the MIL-101(Fe) adsorbent showed excellent reusability for removing MB dye with efficiency exceeded 70% after ten consecutive cycles. Therefore, the as-prepared MIL- 101(Fe) could be applied as a reusable adsorbent for removing cationic dyes from their aqueous solutions.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Yinxiao Zhang,Yanhui Li,Yan He,Jie Zhang,Xinxin Wang,Lianwei Yin,Qiuju Du,Xinxin Pi,Botong Chen,Yichen Li,Haitong Zhou
Adsorption, as a widely used water treatment method, has gradually revealed many drawbacks. Advanced oxidation processes, as emerging water treatment technologies, address some of the limitations of adsorption. However, designing bimetallic catalysts that are easy to synthesize and prevent metal ion leaching is crucial for activating peroxymonosulfate (PMS). To address these issues, this study designs a biochar reactor structure made by simple treatment and composite formation using wood as the base material. Biochar serves as an adsorbent to concentrate PMS and pollutants while preventing metal leaching. Additionally, Co Cu nitrogen-doped graphite carbon derived from metal-organic frameworks (MOFs) is encapsulated within the structure to efficiently activate PMS. The system achieved 100 % methylene blue degradation within one minute. Even after five cycles, it maintained a 95 % removal rate and exhibited excellent degradation performance across a wide pH range, proving its practical applicability. Furthermore, the synergistic pathway and transfer channels involved in adsorption-PMS activation were elucidated through various characterizations to reveal the underlying mechanism. This study aims to provide a novel material with adsorption and catalytic capabilities for the removal of organic pollutants through a simple and easily scalable synthesis method.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Qiang Yao,Jing Guo,Fucheng Guan,Qiang Yang,Jia Li,Da Bao,Jiahao He,Xinbin Ji,Xuecui Song
This work aims to prepare a composite adsorbent with a fixed shape to improve the performance of carbon materials and to solve the problem of adsorbent in powder form which is difficult to recycle after use. The BC-ZnS composite system was successfully prepared by hydrothermal method based on the preparation of biomass carbon (BC) using alginate (Alg), while the ZnS component was grown in-situ on the surface of BC. The effects of Alg, Zn source, hydrothermal temperature and time on the synthesis of BC-ZnS were explored, the results indicated that ZnS was successfully grown in-situ on the BC surface, while the BC maintained its original morphology. BC-ZnS showed excellent adsorption capacity for methylene blue (MB), basic fuchsin (BF), and copper ions (Cu 2+ ), reaching 301.50 mg/g for MB and exhibiting good cyclic stability. The adsorption of MB/BF/Cu 2+ by BC-ZnS was characterized by the presence of multiple forces, where the BC component mainly depended on the electrostatic force of Alg residue, while the ZnS involves electrostatic forces, ion exchange and Lewis acid/base soft-soft interactions. The adsorption process conforms to pseudo-first-kinetics and is a spontaneous entropy-increasing process. BC-ZnS can be a candidate for reusable wastewater treatment and has excellent potential for application.
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ANALYTICA CHIMICA ACTA
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2015
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IF 4.513
Xiaoyun Lin,Yongnian Ni,Serge Kokot
An electrochemical biosensor capable of indirect detection of DNA damage induced by any one of the three endocrine-disrupting compounds (EDCs) – bisphenol A (BPA), 4-nonylphenol (NP) and 4- t -octylphenol (OP), has been researched and developed. The methylene blue (MB) dye was used as the redox indicator. The glassy carbon electrode (GCE) was modified by the assembled dsDNA/graphene oxide-chitosan/gold nano-particles to produce a dsDNA/GO-CS/AuNPs/GCE sensor. It was characterized with the use of electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and scanning electron microscopy (SEM) techniques. The loading/release of the MB dye by the dsDNA/GO-CS/AuNPs film was investigated, and the results showed that the process was reversible. Based on this, the sensor was used to measure the difference between the loading capabilities of intact and damaged dsDNA in the films. The sensor was then successfully applied to detect DNA damage electrochemically. The differential pulse voltammetry (DPV) peak current ratio for MB, observed before and after DNA damage, increased linearly in the presence the BPA, NP or OP compounds; the treatment range was 10–60 min, and the respective damage rates were 0.0069, 0.0044 and 0.0031 min −1 , respectively. These results were confirmed by the binding constants: 2.09 × 10 6 M −1 (BPA-DNA), 1.28 × 10 6 M −1 (NP-DNA) and 9.33 × 10 5 M −1 (OP-DNA), all of which were obtained with the use of differential pulse stripping voltammetry (DPSV).
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