Journal of Water Process Engineering
·
2025
·
IF 6.7
Peng Xiang,Congming Tang,Kai Ma,Xinli Li
It is a key to disclose the structure-dependent adsorption capacity for design and optimization of adsorbent toward removal of dyestuff pollutants from wastewater. Due to this, the relationship between the crystal phase structure of MoS 2 and adsorption capacity for RhB (Rhodamine B) as a typical dyestuff contaminant was investigated. To compare with the commercial MoS 2 ( c MoS 2 ), the diffraction peak ascribed to (002) plane evidently moved toward low 2θ angle in 1T-MoS 2 , suggesting an enlarged interplanar spacing, which was confirmed by HRTEM characterization. 1T-phase displayed far higher adsorption capacity than 2H-phase, in which q t value of 1T-MoS 2 achieved 688.30 ± 10.1 mg/g at 500 mg/L RhB solution, and is 3.0 times larger than c MoS 2 containing 90 % 2H-MoS 2 . Besides, 1T-MoS 2 without sulfur vacancy also displays much higher adsorption capacity than the sulfur vacancy-rich ss MoS 2 , indicating that sulfur vacancy has no contribution to adsorption of RhB. On basis of R 2 criterion, the adsorptions for RhB over c MoS 2 , ss MoS 2 and 1T-MoS 2 well conformed to the pseudo-second order kinetics, indicating that chemical adsorption dominated during the adsorption process. Analysis of structure-dependent adsorption strongly demonstrated that 1T-MoS 2 had more excellent adsorption performance than c MoS 2 and ss MoS 2 due to the synergistic adsorptions of stronger coordination, electrostatic interaction and physisorption. To compare with other adsorbents, 1T-MoS 2 outperformed most of other adsorbents for adsorption of RhB. Cyclic adsorption experiments showed that 1T-MoS 2 possessed an excellent reusability. This work afforded an efficient strategy for crystal phase-mediated adsorption to achieve removal of RhB from wastewater.
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WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 236
·期 1
·1-16
·
IF 3.8
Zheng Lijia,Cao Shoutao,Tang Meng,Ge Ming
A solvothermal route was used to synthesize manganese ferrite/multi-wall carbon nanotubes (MnFe 2 O 4 /MWCNT) composite catalyst, which was firstly employed to activate peroxymonosulfate (PMS) to eliminate rhodamine B (RhB) from water. The catalytic activity of the as-obtained MnFe 2 O 4 /MWCNT for PMS activation and RhB degradation was higher than that of MnFe 2 O 4 and MWCNT. The optimal MnFe 2 O 4 /MWCNT-10 catalyst (0.3 g/L) can remove 98.1% of RhB (20 mg/L) from water by activating PMS (1.0 g/L) after 100 min of reaction, and this catalyst remained stable in the oxidation process. Quenching experiments, X-ray photoelectron spectroscopy (XPS) and electrochemical analysis demonstrated that RhB elimination in the MnFe 2 O 4 /MWCNT-PMS system was accomplished by the non-radical ( 1 O 2 and electron transfer) and free radical (O 2 •− , SO 4 •‒ and •OH) oxidation pathways, and 1 O 2 played a leading role. The influence of operational factors (PMS dosage, initial solution pH, catalyst dosage, reaction temperature, common inorganic anions and water matrix) on RhB removal by MnFe 2 O 4 /MWCNT-10 activated PMS was investigated in detail. The presence of Cl ‒ ions significantly boosted RhB degradation due to the production of more 1 O 2 .
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Qi Wang,Yuqi Liu,Han Chen,Tong Yan,Xinying Wang,Yusi He,Baizhuang Li,Biao Li,Yuebin Feng,Huilong Luo,Wei Li
Cobalt-based materials have been proved to be effective heterogeneous catalysts for the activation of peroxymonosulfate (PMS) to degrade many refractory organic dyes. Herein, a novel Co-based complex was prepared by hydrothermal method using py (pyridine) and pda (pyridine-2,3-dicarboxylic acid) as mixed ligands and Co(NO 3 ) 2 ·6H 2 O as Co 2+ ion source and characterized by techniques of Single-crystal X-ray diffraction (SC-XRD), Fourier transform infrared spectroscopy (FTIR), powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TG), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET). Then the prepared Co-based complex was utilized as a peroxymonosulfate (PSM) activator for the efficient degradation of Rhodamine B (Rh B). It was found that the degradation efficiency of Rh B by the system was as high as 98.34 % within 10 min. Meanwhile, the effects of Rh B concentration, catalyst dosage, PMS dosage, and reaction temperature on the degrading process were investigated. Free radical capture experiments confirmed that sulfate radical (SO 4 ˙ˉ) and hydroxyl radical ( ˙ OH ) were the main free radicals that played a role in the degradation of Rh B dye, and the possible degradation mechanism of the reaction was proposed. The recyclability test demonstrated that the catalytic efficiency of the prepared Co-based complex was still higher than 95 % after four cycles, and the characteristic peaks of PXRD spectrum match the simulated pattern. The present results indicated that the prepared Co-based complex can be serve as a stable and effective catalyst for generating free radicals (such as SO 4 • − , • OH) to further treat organic dyes and provide more options for future wastewater remediation.
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ANALYTICAL BIOCHEMISTRY
·
2017
·
IF 2.334
Xuan Ni,Bing Xia,Lumei Wang,Jing Ye,Gaoshang Du,Haiwei Feng,Xiaotong Zhou,Tong Zhang,Wenhao Wang
In this paper, we developed a fluorescent aptasensor for 17β-estradiol (E2) determination in aqueous solution using label-free E2-specific aptamer, gold nanoparticles (AuNPs) and Rhodamine B (RhoB) as sensing probe, fluorescent quencher and fluorescent indicator respectively. In the absence of E2, AuNPs were wrapped by E2 aptamer and maintained dispersed in NaCl solution basically. These dispersed AuNPs could effectively impair the originally high fluorescence of RhoB. Contrarily, in the presence of E2, E2 aptamer could specifically combine with E2 to form E2-aptamer complex, so the AuNPs were released by E2 aptamer and aggregated under the influence of NaCl. The aggregated AuNPs have a weak influence on RhoB fluorescence. Therefore, the E2 concentration can be determined by the change of fluorescence intensity of RhoB. This fluorescent assay has a detection limit as low as 0.48 nM, a linear range from 0.48 to 200 nM, and high selectivity over other disrupting chemicals. It was applied to determine E2 in water samples with recoveries in the range of 94.3–111.7%. The fluorescent aptasensor holds great potential for E2 detection in environmental water samples.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Jinyang Liu,Qiqi Liao,Chengcai Li,Xueliang Jiang,Jiuming Li,Wangyong Jin,Guojin Liu,Yuhai Guo,Bin Yu,Hailin Zhu
Being a low-energy, reusable, and environmentally friendly degradation technology, photocatalysis has excellent application prospects in textile dye wastewater degradation. In this study, we combine the advantages of photocatalysis and membrane technology to prepare photocatalytic membranes that immobilize the photocatalyst and alleviate membrane pollution. Dual-precursor graphitic carbon nitride (U6M1) was composited with Bi 12 TiO 20 (BTO) using the annealing method to prepare a novel Δ(Z + II)-type BTO/U6M1 photocatalyst with visible-light response capacity. Subsequently, BTO/U6M1/PES composite photocatalytic membranes were fabricated using the nonsolvent-induced phase separation (NIPS) method, and the photodegradation activity of the composite membranes was executed against rhodamine B (RhB) dye. The results indicated that the composite membrane exhibiting the best photocatalytic performance achieved nearly 100 % degradation of RhB within 120 min. Furthermore, the membrane with optimal photocatalytic performance retained photocatalytic activity for five consecutive dye degradation tests, demonstrating its reusability.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Jieli Ou,Yiqing Liu,Linyue Zhang,Zhenran Wang,Yuqi Tang,Yongsheng Fu,Dandan Zhao
Although Cu(II)/peroxymonosulfate (PMS) process has been successfully applied to degrade varied organic contaminants in water, the slow transformation of Cu(II) to Cu(I) that works only in alkaline conditions retards the treatment efficiency of this process. In this study, a new finding was observed, that is, oxytetraczdycline (OTC) could effectively enhance the degradation of organic pollutants in Cu(II)/PMS process where it was also removed in acidic conditions. With the addition of OTC in Cu(II)/PMS system, 85.5% of rhodamine B (RhB) was degraded in 90 min at pH 4.0, which was far more than that without OTC (36.1%), and simultaneously 98.1% of OTC was eliminated. The added OTC could form OTC-Cu(II) complexes which might powerfully improve the reduction of Cu(II) to Cu(I), exerting a positive effect on the PMS activation and subsequent degradation of RhB. Electron paramagnetic resonance (EPR) experiments assisted with radical scavenging experiments and Raman spectrum detection results suggested that Cu(III) and hydroxyl radical (HO • ) were the predominant reactive species for RhB degradation, while OTC removal in this system was mainly ascribed to direct PMS oxidation. The Cu(II)/PMS process also showed a promising success on the synergistic degradation of OTC with the other four refractory organic pollutants , indicating the potential application of PMS oxidation in water treatment .
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CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Yingtong Pan,Yiwen Tang,Ji-Xuan Liu,Guo-Jun Zhang
High-entropy engineering offers a new paradigm for catalyst design. In this study, a high-entropy BiFeO 3 -based catalyst was synthesized via rare-earth multi-element doping. Entropy engineering enhanced structural stability and oxygen vacancy concentration, which promoted iron redox cycling and the generation of reactive oxygen species, thereby boosting activity in Fenton reactions. The catalyst achieved 96.9 % rhodamine B degradation within 20 min ( k = 0.169 min −1 ) under neutral conditions. It retained 93.5 % activity after multiple cycles without ion leaching, demonstrating excellent stability, scalability, and durability. This work confirms the feasibility of high-entropy strategies in developing efficient and sustainable catalysts for water treatment applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2025
·
IF 0
Wu Guizhi,Duan Xuebin,Xu Hongqing,Han Chunyu,Liu Jing,Yan Boyin,Li Jincheng,Wang Jianming,Wang Songxue
The UV/SPC process was employed for the removal of rhodamine B (RhB), and the influences of reaction parameters and natural water components on the degradation of RhB were systematically studied. The results demonstrate that RhB can be efficiently eliminated in the UV/SPC system compared to using UV photolysis or SPC oxidation alone, with •OH and CO 3 •− being the main radicals to degrade RhB. The degradation efficiency of RhB was enhanced with increasing SPC concentration but decreased with increasing initial RhB concentration. Moreover, the degradation efficiency of RhB decreased with the increasing initial pH. When pH increased from 3 to 11, the degradation efficiency of RhB declined from nearly 100 to 81.93% within 20 min. Natural organic matter (NOM) and anions (Cl − and HCO 3 − ) exhibited an inhibitory effect on the degradation of RhB in the UV/SPC system, and the inhibitory effect was aggravated with the increase of NOM and anion concentrations. Consequently, there was a decrease in the degradation efficiency of RhB in the UV/SPC system in real water compared to pure water. The byproducts generated during the degradation of RhB were attributed to hydroxylation, N -deethylation, and C-O bond cleavage. Some intermediate products from RhB degradation still pose relatively high environmental risks, while most have low environmental hazards.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2015
·Vol. 33
·期 10
·1470-1476
·
IF 1.835
Zu Xi-hong,Jian Zhi-hui,Yi Guo-bin,Huang Hai-liang,Zhong Ben-bin,Luo Hong-sheng,Huang Jia-rong,Wang Cui
In this study, well-ordered gold nanoparticle array on silicon substrate was adopted as an active surface-enhanced Raman scattering substrate for detecting rhodamine B (RB), and the influence of RB morphologies on surface-enhanced Raman scattering (SERS) properties was discussed. The Au nanoparticle array was prepared by using patterned P4VP nanodomains of poly(styrene- b -4-vinylpyridine) (PS- b -P4VP) diblock copolymer thin films as nanoreactors which is a simple and economical approach. The results show that Raman spectra of RB on the Au nanopaticle array have much stronger intensity than those on the bare silicon substrate by detecting same RB solution. It indicates that the prepared Au nanoparticle array on silicon substrate has a significant Raman enhancement for RB. Interestingly, the Raman intensity of RB from its ethanol solution is much stronger than that from its aqueous solution due to the special morphologies of RB formed in their ethanol solutions. This work provides an effective approach to prepare highly sensitive and stable surface-enhanced Raman scattering substrate.
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JOURNAL OF HAZARDOUS MATERIALS
·
2014
·
IF 4.331
Chengqun Xu,Honghai Wu,Feng Long Gu
BiOBr/Na–montmorillonite composites (BiOBr–Mt) were prepared under laboratory ambient conditions by using the surfactant cetyltrimethylammonium bromide (CTAB) as the Br source and template, and the as-synthesized samples were characterized by XRD, FT-IR, FESEM, TEM equipped with EDS, BET and UV–vis DRS techniques. Interestingly, the particle size of BiOBr can be controlled by CTAB modified Na-montmorillonite. The photocatalytic activity of the as-prepared was further evaluated by decomposition of Rhodamine B (RhB) under visible light irradiation; the obtained results revealed that the BiOBr–Mt sample had strong photoabsorption in the visible light region. It has higher photocatalytic activity than pure BiOBr alone. There exists an efficient adsorption for RhB onto BiOBr–Mt contrast to that onto the pure BiOBr. The adsorption processes can be well described by pseudo-second-order kinetic model; meanwhile, the adsorption behaviors can be described by both Freundlich and Langmuir equations but the former was better. Additionally, the relevant adsorption and degradation mechanisms were explored and the possible mechanisms were presented. The photocatalytic activity has high effect both in acidic and basic conditions on the degradation reaction but in acidic condition is more favorable. After three recycles, BiOBr–Mt did not exhibit any significant loss of photocatalytic activity, confirming the photocatalyst was essentially stable.
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CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Dan Wang,Pengkun Hou,Dietmar Stephan,Shifeng Huang,Lina Zhang,Ping Yang,Xin Cheng
For surface functionalization of cement-based materials with photocatalytic properties, weak adhesion between photocatalysis and matrix worsens these properties and results in poor weathering resistance in outdoor environments. To overcome these problems, in this study, two SiO 2 /TiO 2 composites, with different deposited densities of TiO 2 nanoparticles on a SiO 2 sphere, were prepared and used for surface coating of cement-based materials. The two composites show different efficiencies. The photocatalytic results show that the coated cement pastes exhibited excellent rhodamine B-removal efficiency before and after curing and accelerated weathering processes, indicating that SiO 2 in the system has a crucial effect as a ‘glue’ preventing the release of TiO 2 . The bonding mechanism was revealed by the reaction of the samples and main components and hydration products (such as CH, C-S-H and C 3 S).
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RSC Advances
·
2025
·Vol. 15
·期 16
·12629-12644
·
IF 4.6
Yinqi Yang,Guoshuai Ma,Xiaoli Hu,Wei Wang,Zhonglin Du,Yao Wang,Xue-zhong Gong,Haoyu Tan,Fengxiang Guo,Jianguo Tang
In the context of sustainable development, the utilization of semiconductor materials for the degradation of dyes, antibiotics, heavy metals, and pesticides in wastewater under visible light has emerged as a focal point of contemporary research. In this investigation, a WO3@TiO2 composite was synthesized via a solvothermal method, with the composite exhibiting a molar ratio of 5% WO3 to TiO2 precursors demonstrating optimal photocatalytic degradation performance. This material achieved complete degradation of 20 mg per L Rhodamine B (RhB) dye and tetracycline (TC) antibiotic within 30 min. Furthermore, the effects of initial pollutant concentration and solution pH on catalytic efficacy were systematically explored. The findings revealed that at RhB concentrations below 40 mg L−1, the degradation proceeded at an accelerated rate, with a rate constant exceeding 0.128 min−1. The catalyst exhibited robust performance across a broad pH range, attaining peak degradation efficiency at pH ≈ 3. The exceptional photocatalytic prowess of the WO3@TiO2 composite is predominantly attributable to its distinctive hollow microstructure, the intimate interfacial synergy between WO3 and TiO2, and the efficient separation of photogenerated electrons and holes facilitated by the type-II heterojunction architecture.
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