CHEMOSPHERE
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2020
·
IF 5.778
Tianchan Zang,Hao Wang,Yinghao Liu,Li Dai,Shuang Zhou,Shiyun Ai
The disposal and management of waste sludge is a considerable challenge for environmental protection and resource utilization. Herein, sludge-based biochar material loaded with nano-Fe 3 O 4 (xS@Fe-y) was fabricated via hydrothermal carbonization process and employed as catalyst to activate peroxymonosulfate (PMS) for degrading organic dyes in wastewater. Benefiting from the proper iron content, porous structure and the good dispersibility of iron on the catalyst surface, the proposed 5S@Fe-500 catalyst not only exhibited excellent catalytic activity and durability in the activation of PMS to degrade Rhodamine B (RhB), which was almost completely removed in 10 min (50 mL 50 mg L −1 ), but also performed broad application prospects in pollutant degradation . More importantly, the free radical quenching test and electron spin-resonance spectroscopy (ESR) detection demonstrated that O 2 • - , SO 4 • - , OH and 1 O 2 were generated during the process of catalyst activation of PMS. Based on this, a possible reaction pathway for degrading RhB with the aid of 5S@Fe-500 was put forward. It is believed that this work offers a promising reuse method of converting the waste sludge to a high efficiency and low-cost nano magnetic catalyst to activate PMS for degrading refractory organic pollutants in aquatic surroundings.
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DYES AND PIGMENTS
·
2020
·
IF 4.613
Xueyan Liu,An Chen,Yuxin Wu,Chengyou Kan,Jianhong Xu
The stimulus-responsive P(MMA- co -BA- co -RhBUEA) latexes were prepared by miniemulsion polymerization of butyl acrylate (BA), methyl methacrylate (MMA), and a rhodamine-based probe RhBUEA. Their chemical composition and structures were characterized by FTIR and UV–Vis spectral analysis. Meanwhile, the effects of AIBN, SDS , and RhBUEA content on the miniemulsion polymerization and the morphology of latex particles were investigated. Based on the recipe of 30 mM SDS to the volume of water, 2 wt% AIBN and 5 wt% RhBUEA to the total monomers , the sensing properties of the resultant latex and its film were studied. Both the latex and the latex film displayed the noticeable color change, high sensitivity, superior selectivity, and anti-interference properties towards Fe 3+ over other metal ions in aqueous solution. The detection limits of the latex and the latex film were 0.122 and 0.208 μM, respectively. Furthermore, the film sensor exhibited good recyclability thanks to the off-on switch, possessing the potential as a portable and reversible chemosensor for the naked-eye detection of Fe 3+ .
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Materials
·
2019
·Vol. 12
·期 23
·3948
·
IF 2.972
Lingfang Qiu,Zhiwei Zhou,Mengfan Ma,Ping Li,Jinyong Lu,Yingying Hou,Xiangshu Chen,Shuwang Duo
Novel visible-light responded aluminosilicophosphate-5 (SAPO-5)/g-C3N4composite has been easily constructed by thermal polymerization for the mixture of SAPO-5, NH4Cl, and dicyandiamide. The photocatalytic activity of SAPO-5/g-C3N4is evaluated by degrading RhB (30 mg/L) under visible light illumination (λ > 420 nm). The effects of SAPO-5 incorporation proportion and initial RhB concentration on the photocatalytic performance have been discussed in detail. The optimized SAPO-5/g-C3N4composite shows promising degradation efficiency which is 40.6% higher than that of pure g-C3N4. The degradation rate improves from 0.007 min−1to 0.022 min−1, which is a comparable photocatalytic performance compared with other g-C3N4-based heterojunctions for dye degradation. The migration of photo-induced electrons from g-C3N4to the Al site of SAPO-5 should promote the photo-induced electron-hole pairs separation rate of g-C3N4efficiently. Furthermore, the redox reactions for RhB degradation occur on the photo-induced holes in the g-C3N4and Al sites in SAPO-5, respectively. This achievement not only improves the photocatalytic activity of g-C3N4efficiently, but also broadens the application of SAPOs in the photocatalytic field.Keywords:g-C3N4;SAPO-5;composite;photocatalytic;visible light
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
·
IF 2.298
Guohong Yao,Sisi Li,Jun Xu,Hui Liu
A dual-responsive hydrogel based on graphene oxide (GO) was prepared by in situ radical copolymerization of N-isopropyl acrylamide (NIPAM) as a temperature-sensitive component and acrylic acid (AA) as a pH-sensitive unit. The resulting hydrogels (GO/poly(NIPAM-co-AA) (PNA) were systematically characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and scanning electron microscopy. With the change of AA content, the lower critical solution temperature of hydrogels changed from 26.91 to 24.38 °C. The swelling ratio under alkaline condition was higher than that under acidic condition. The adsorption of rhodamine B (RB) followed Langmuir isotherm model and pseudo-second-order model, and nearly 93% of RB could be released within 10 h at pH 4.01 and 60 °C. With imidacloprid as the model drug, the higher cumulative release rate of the GO/PNA hydrogel was obviously observed at pH = 4.01 than at pH = 9.18. On the basis of their good adsorption–desorption, loading-releasing, and regeneration ability, the GO/PNA hydrogel as a multifunctional adsorbent might have broad application prospects in environmental protection and biomedical engineering.
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Nanomaterials
·
2018
·Vol. 8
·期 4
·248
·
IF 3.504
Fuhua Wei,Ding Chen,Zhao Liang,Shuaiqi Zhao
Using a microwave-assisted ball-milling approach, Fe-based metal-organic frameworks (Fe-MOFs) were prepared from FeSO4·7H2O and trimesic acid. Scanning electron microscopy, Fourier-transform infrared spectrometry, X-ray, and thermogravimetric analysis were utilized to characterize the thermal stability and structure of the prepared Fe-MOFs. These Fe-MOFs were used to remove organic dyes from aqueous solutions. Specifically, they removed 96.97% of 23.3592 mg/L of Congo red in a 200 mL solution within 300 min of treatment with natural light at 15 °C. Likewise, 88.21 and 70.90% of 22.7527 mg/L of Orange II and 17.8326 mg/L of Rhodamine B, respectively, were removed from 200 mL solutions within 300 min of treatment at 15 °C. At 35 °C, 99.57, 95.98, and 99.38% of 23.3855 mg/L of Congo Red, 22.7365 mg/L of Orange II, and 17.9973 mg/L of Rhodamine B, respectively, were removed from 200 mL solutions within 300 min of treatment. The adsorption kinetics were investigated and the pseudo-first-order kinetic model was found to be superior to the pseudo-second-order kinetic model. Overall, using metal-organic frameworks to treat dye wastewater was found to be inexpensive, feasible, and efficient. Therefore, this material has future prospects in research and applications in the purification of wastewater.Keywords:wastewater treatment;metal-organic frameworks;dye removal;microwave-assisted ball milling
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NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 40
·期 1
·755-763
·
IF 3.086
Zhihong Zhang,Hongfei Ji,Shuai Zhang,Donglai Peng,Qixuan Fu,Minghua Wang,Linghao He,Lingyu Yue
We report a novel nanocomposite of hollow TiO2 microspheres and plasma polyacrylic acid (TiO2@PPAA) modified with rhodamine B (TiO2@PPAA-RhB). This nanocomposite was further used as an electrochemical sensor for the ultra-sensitive and selective detection of Cu2+ in water. A gold electrode was modified with hollow TiO2 nanospheres, followed by the closely bonded layer of PPAA via plasma polymerization. Subsequently, the carboxyl groups of TiO2@PPAA nanocomposites were activated to ester groups by N-hydroxysuccinimide/1-ethyl-3-(3-dimethylaminoprolyl) carbodiimide hydrochloride. The resultant activated ester groups reacted with the amino groups on rhodamine to form the amide groups, leading to the modification of TiO2@PPAA nanocomposites with rhodamine. Considering the synergistic effect of strong electrostatic interaction between the carboxyl groups of PPAA and Cu2+, the direct adsorption of Cu2+ on the TiO2 surface, and the coordination chemistry formed between Cu2+ and rhodamine, the developed electrochemical biosensor exhibited high sensitivity of Cu2+ detection, with a detection limit of 0.404 pM within the range of 0.001–10 nM of Cu2+. Therefore, the fabricated electrochemical sensor based on TiO2@PPAA-RhB can be obtained via plasma polymerization and represents a highly promising tool for use in environmental monitoring.
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CERAMICS INTERNATIONAL
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2015
·
IF 2.605
Tingting Li,Shenglian Luo
Ag 2 O/Bi 2 O 3 microspheres were successfully synthesized by a facile co-precipitation hydrothermal method in the presence of surfactant polyvinylpyrrolidone (PVP). X-ray diffraction confirmed that Ag 2 O/Bi 2 O 3 was made up of the cubic Ag 2 O phase and the tetragonal Bi 2 O 3 phase. Scanning electron microscopy and transmission electron microscopy showed that the synthesized Ag 2 O/Bi 2 O 3 microspheres were assembled by radially grown nanosheets with the thickness of about 50 nm. In comparison with N-doped TiO 2 , Bi 2 O 3 and Ag 2 O, the Ag 2 O/Bi 2 O 3 composites showed much higher efficiency for photodegradation of Rhodamine B (RhB) under visible light irradiation ( λ ≥420 nm). Among the Ag 2 O/Bi 2 O 3 composites, the sample with 0.3 mol fraction of Ag 2 O exhibited the highest photocatalytic activity. The excellent photocatalytic activity of Ag 2 O/Bi 2 O 3 may be ascribed to the strong visible light absorption resulting from the quantum dot sensitization of Ag 2 O and the efficient separation of photogenerated electron–hole pairs through Ag 2 O/Bi 2 O 3 heterojunction . The possible photocatalytic mechanism was proposed based on band gap structure analysis and the reaction effects by adding the radical scavengers.
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JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Xiaojing Hou,Wenjuan Shen,Xiaopeng Huang,Zhihui Ai,Lizhi Zhang
Molecular oxygen activation by ferrous ions (Fe(II)) in aqueous solution could generate reactive oxygen species (ROS) with high oxidation potential via reaction between Fe(II) and oxygen molecules (Fe(II)/air), however, ROS yielded in the Fe(II)/air process is insufficient for removal of organic pollutants due to the irreversible ferric ions (Fe(III)) accumulation. In this study, we demonstrate that ascorbic acid (AA) could enhance ROS generation via oxygen activation by ferrous irons (AA/Fe(II)/air) and thus improve the degradation of rhodamine (RhB) significantly. It was found that the first-order aerobic degradation rate of RhB in the AA/Fe(II)/air process in the presence of ascorbic acid is more than 4 times that of the Fe(II)/Air system without adding ascorbic acid. The presence of ascorbic acid could relieve the accumulation of Fe(III) by reductive accelerating the Fe(III)/Fe(II) cycles, as well as lower the redox potential of Fe(III)/Fe(II) through chelating effect, leading to enhanced ROS generation for promoting RhB degradation. This study not only sheds light on the effect of ascorbic acid on aerobic Fe(II) oxidation, but also provides a green method for effective remediation of organic pollutants.
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DYES AND PIGMENTS
·
2014
·
IF 3.468
Xianyi Cao,Fei Shen,Minwei Zhang,Jiajia Guo,Yeli Luo,Jingyue Xu,Ying Li,Chunyan Sun
A rapid, convenient and highly sensitive method for melamine detection was presented based on fluorescence resonance energy transfer between rhodamine B and citrate-stabilized gold nanoparticles . Rhodamine B could be electrostatically adsorbed to the surface of gold nanoparticles and the fluorescence emission of rhodamine B was quenched. Upon addition of melamine, the decreased fluorescence emission recovered, since melamine could induce the aggregation of gold nanoparticles and release the adsorbed rhodamine B. Under the optimal conditions, the fluorescence recovery efficiency was linearly proportional to melamine concentration in the range of 5–1000 μg L −1 . The detection limit was 0.18 μg L −1 , which was greatly lower than the safety limits required in China. The method was successfully applied for melamine detection in milk and powdered infant formula. Many advantages were exhibited by the system such as facile material synthesis, ease of operation, rapid analysis and competitive analytical performance.
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WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 9
·1-11
·
IF 3.8
Wei Hongyan,Li Xuejiao,Chen Lizhu,Li Shujie,Liu Hongxu,Song Tiehong
At present, the visible light (Vis) catalytic oxidation, as a wastewater treatment approach without secondary pollution, has captured the interest of many researchers. However, the efficiency of visible photocatalysis still needs to be continuously improved. In this study, a piezoelectric photocatalyst Bi 2 WO 6 (BWO) responding to both Vis and ultrasound (US) was prepared, characterized, and employed to treat Rhodamine B (RhB) in water. The removal efficiencies of RhB under different systems (Vis/BWO, US/BWO, (Vis + US)/BWO) were investigated and the reuse capacity of BWO were examined. Moreover, the piezoelectric photocatalytic mechanism of (Vis + US)/BWO system on RhB removal was analyzed. The results exhibited that the prepared Bi 2 WO 6 possessed excellent photoresponsive and piezoresponsive properties, and the removal and mineralization of RhB could reach 100% and 77.2% within 60 min, respectively. Under the combined effect of photocatalysis and piezoelectricity, the superoxide radicals, hydroxyl radicals, and photogenerated holes produced, which were responsible for the degradation of RhB in (Vis + US)/BWO system. Graphical Abstract
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POLYMER BULLETIN
·
2017
·Vol. 75
·期 7
·2887-2900
·
IF 1.43
Liu Qian,Yan Chun-Na,Xu Xin-Meng,Wang Li-Ping,Li Guang
Novel poly(hydroxypropyl acrylate)- co -poly(hydroxypropyl acrylate)-rhodamine B (PHPA- co -PHPA-RhB) hydrophilic copolymers were synthesized via radical polymerization in this paper. And then the honeycomb-structured porous films were fabricated by dropping the (PHPA- co -PHPA-RhB) copolymers and PS solution on glass substrates by breath figure method (BFM). The effects of solvent, hydrophilic copolymers’ molecular weight, the proportion of hydrophilic copolymers and hydrophobic polymers on the formation of porous films were investigated. The porous films were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), spectrofluorometer and confocal laser scanning microscope (CLSM). The results show that PHPA- co -PHPA-RhB and PS solutions can form regular honeycomb porous films; the average diameter of the films pore decreases with the proportion of hydrophobic polystyrene increased. Similar regular was also found when the molecular weight of PHPA- co -PHPA-RhB was enhanced. Furthermore, the fluorescence properties of the porous films were also investigated in this study.
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LANGMUIR
·
2025
·
IF 3.9
Wantao Li,Yunlan Xu,Dengjie Zhong,Danli Tang,Tanxia Xiang,Chunmiao Fan,Yuanfang Yang
In this study, CoFe2O4 anchored by MoS2 modified biochar (CoFe2O4@MoS2–BC) was synthesized using a hydrothermal approach and utilized to activate peroxymonosulfate (PMS) to degrade rhodamine B (RhB). The effects of pH value, catalyst and PMS dosage, RhB concentration, and coexisting compounds were systematically investigated. Within 7 min, CoFe2O4@MoS2–BC achieved a removal rate of 99.63% for 100 mg·L–1 RhB. The outstanding stability and environmental compatibility of CoFe2O4@MoS2–BC was verified by cycling and metal ion leaching experiments. The contribution of 1O2, SO4•–, •OH, and •O2– in the degradation procedure was revealed by quenching experiments, among which 1O2 was the predominant active species. Electrochemical characterization indicated that CoFe2O4@MoS2–BC exhibited enhanced current density, redox activity, and superior electron transfer capability. Comprehensive characterization analysis and experimental data revealed that the high efficiency of CoFe2O4@MoS2–BC was attributed to Co2+/Co3+, Fe2+/Fe3+, and Mo4+/Mo6+ redox cycling on the CoFe2O4@MoS2–BC surface. The cycles of Co2+/Co3+ and Fe2+/Fe3+ were enhanced by Mo, while unsaturated S increased the reactivity of Mo, thereby accelerating the redox of metal ions; oxygen vacancies (Ov) enhance the mobility of surrounding oxygen ions mobility and promoted the conversion from lattice oxygen (Olat) to reactive oxygen species (O*), thereby activating PMS effectively. This research is expected to provide innovative insights that will inform the design and development of excellent activity and stability of heterogeneous metal-based catalysts.
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