CHEMOSPHERE
·
2020
·
IF 5.778
Danping Wu,Fangfang Li,Quan Chen,Min Wu,Wenyan Duan,Qing Zhao,Bo Pan,Baoshan Xing
Significant degradation of organic contaminants in biochar sorption systems has recently been reported, demonstrating a promising potential application of biochar in pollution control . We hypothesized that the degradation of organic chemicals by biochar may be further enhanced under irradiation by UV light due to the photocatalytic activities of carbonaceous materials . Our results confirmed that UV conditions increased the degradation of rhodamine B (RhB) by up to three times compared to dark conditions. Washing biochar with ultrapure water further increased RhB photodegradation by up to ten times. This photodegradation increase was the highest for biochar produced at 1000 °C. HF treatment and the addition of biochar supernatant did not increase RhB photodegradation. Therefore, the biochar properties mediating RhB photodegradation may be related to solid particles, mostly the combination of graphite structures and organic functional groups. Based on XPS and FTIR analysis, we propose that the quinoid C O in biochar may play an essential role in RhB photodegradation. Further research on identifying the photoactive components of biochar will be fundamental for improved biochar manufacture and application.
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高影响因子
Micro & Nano Letters
·
2019
·Vol. 14
·期 11
·1192-1197
·
IF 0.975
Minyuan Yin,Yusong Pan,Chengling Pan
In the present study, the adsorption properties of graphite oxide (GO) for Rhodamine B (RhB) under different conditions was investigated. The specific surface area of the GO adsorbent decreased from 71.5 m 2 g −1 for before adsorption of RhB to 4.9 m 2 g −1 for after adsorption of RhB. The maximum adsorption capacity was 578.0 mg g −1 at 303.15 K. Moreover, the pH value has a great influence on the adsorption properties of GO. The adsorption capacity of GO for RhB increased first and then decreased with the rise of pH value. Study on the adsorption kinetics verified that the adsorption process conformed to the pseudo-second-order model adsorption process. The isothermal model is consistent with the Langmuir isothermal model and belongs to the monolayer chemical adsorption.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 15
·12447-12456
·
IF 2.779
Li Z. L.,Li S. Y.,Liu X. R.,Yuan S. Y.,Zhang Z. R.,Feng E. K.,Yang Z. M.,Han X. N.
In view of photodegradation of antibiotics based on SnS 2 , larger specific surface area SnS 2 microcubes remain rare. In this paper, shape-controlled SnS 2 microcubes with defects were successfully prepared via a simple template-engaged strategy. The obtained microcubes manifested high specific surface area (43.80 m 2 g −1 ). The degradation performance for Rhodamine B (RhB) was investigated in detail, including the effect of parameters, like different photocatalysts, pH, and catalyst dosage. The results indicated that degradation efficiency was 99.90% under visible light within 80 min. Moreover, the degradation efficiency was 79% after the four successive cycles.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Qizhou Dai,Lei Jiang,Xubiao Luo
Titanium based lead dioxide electrodes were successfully prepared by the method of electrodeposition in nitrate solution, including titanium base, Sn-SbO X interlayer, α-PbO 2 middle layer and β-PbO 2 active layer. Rhodamine B (RhB) was selected as the model pollutant to optimize the effects of operational factors in the electrochemical oxidation process. The removal of RhB and chemical oxygen demand (COD) were detected at different reaction time and the relative optimized results were achieved on condition of the concentration of supporting electrolyte, initial RhB concentration, pH value and applied current density at 0.1 mol/L, 200 mg/L, 4.4, and 20 mA/cm 2 , respectively. The kinetics results on RhB removal indicated that RhB degradation by electrochemical oxidation followed the pseudo- first-order reaction. Besides, UV-vis spectra revealed that the conjugated structure of RhB was easier and prior to be degraded. The intermediates generated in the solution were identified by GC/MS and a possible degradation pathway of RhB was proposed.
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WATER SCIENCE AND TECHNOLOGY
·
2021
·Vol. 83
·期 4
·751-761
·
IF 1.915
Yu Hong,Yang Xiuyun,Zhang Donghui,Guo Manran,Hou Yue,Li Leijiao,Bao Siqi
Tellurium quantum dots (Te QDs) were prepared using bulk tellurium as the precursor. Te QDs can be a highly active photocatalyst for boosting the photocatalytic degradation of rhodamine B (RhB) under visible light irradiation. The morphology and composition of Te QDs were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results showed that in the presence of H 2 O 2 , the photocatalytic efficiency of Te QDs on RhB could achieve a good degradation effect within a very short time (30 min). The effects of initial dye concentration, pH value, light intensity, catalyst dosage and H 2 O 2 concentration on dye degradation were successively studied. The effects of inorganic ions (NO 3 − , Cl − , SO 4 2− , Ca 2+ , Mg 2+ and Fe 3+ ) on photocatalytic degradation were also discussed. Experimental results of free radical capture showed that OH • and O 2 •− played important roles in photocatalytic degradation. More importantly, Te QDs efficiency still remained above 85% after four cycles of use, indicating good stability, recyclability and utility. This work may inspire further design of other semiconductor QDs for highly efficient dye degradation. Te QDs was prepared by a simple method and used for the efficient degradation of RhB. OH· and O 2 •− formed in the presence of H 2 O 2 effectively contributed to the degradation of RhB. Te QDs possess good stability, commendable repeatability and high catalytic activity.
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JOURNAL OF CHEMICAL PHYSICS
·
2022
·Vol. 157
·期 21
·
IF 4.304
Li Dong,He Xiaoxiao,Zhao Litao,Li Haoyang,Zhang Xiaolei,Chen Jinquan,Jin Qingyuan,Xu Jianhua
Graphene and its derivatives, due to their two-dimensional carbon nanostructures, have provided new opportunities to fortify organic dye-based photovoltaic and photocatalytic assemblies. In this article, we employed organic dyes Rhodamine B (RdB) and graphene oxide (GO) [or reduced graphene oxide (RGO)] to assemble the composite materials RdB–GO and RdB–RGO. It was found that both GO and RGO could strongly quench the fluorescence (FL) intensity of RdB. The mechanisms of FL quenching in both RdB–GO and RdB–RGO have been investigated by using femtosecond fluorescence up-conversion and transient absorption spectroscopy. When RdB was anchored on the GO (or RGO) surface, the solvent relaxation component 3.1 ps of pure RdB disappeared; instead, the ultrafast excited state electron transfer process (1–2ps) in RdB-GO and RdB-RGO was found and originated from the LUMO of RdB to the conduction band of GO (or RGO). We further reveal that the energy level change caused by GO reduction makes the energy levels of RGO closer to those of RdB, resulting in the electron transfer being more effective in RdB–RGO. Therefore, the RdB–RGO composite materials may have higher application values for dye-sensitized solar cells.
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高影响因子
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2024
·
IF 3.2
Lijun Jin,Lixia Jin,Haiyang Liu,Zhe Wang,yuguang Lv
Rhodamine B, hydrazine hydrate, and HCl generated the intermediate LBXJ. Next, LBXJ, chromone 3-formaldehyde, and 100 % ethanol prepared the probe Y2ST. NMR, IR, and MS. described the intermediate and probe structures. Following the determination of the structure, tests were conducted on the response time, pH value, linearity, detection limit, accuracy, coordination ratio, and recovery of samples. Additionally, the fluorescence selectivity of ions was compared. The rate of Zn 2+ detection in zinc gluconate was 96.1 % at 5 × 10 −6 mol/L--5 × 10 −5 mol/L, while the detection limit of Y2ST was 0.7 × 10 −6 mol/L. It can be applied to Zn 2+ content determination.
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Desalination and Water Treatment
·
2016
·
IF 1.272
Yongsheng Lu,Xingxing Yang,Lu Xu,Zhan Wang,Yunfeng Xu,Guangren Qian
The Fe3+/persulfate system for Rhodamine B (RhB) oxidative degradation has been investigated. The catalytic mechanism in the Fe3+/persulfate system was proposed as follows: Fe3+ was restored to Fe2+ by the generated intermediate products during the degradation process. The influence parameters were examined in batch experiments, including Fe3+ and persulfate concentration and initial pH. The results indicated that the Fe3+/persulfate system exhibited good performance for RhB degradation and followed first-order kinetics. 95.91% of the RhB was removed within 30 min under the following conditions: [Fe3+]0 = 1 mM, [persulfate]0 = 1 mM and pH 3.0. The RhB degradation efficiencies increased as the Fe3+ and persulfate concentrations increased. In addition, the RhB degradation was inhibited in the presence of inorganic anions, which was primarily due to a complex reaction between Fe3+ and various anions except for .
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 10
·7772-7779
·
IF 3.289
Huiping Zhao,Yafang Zhang,Guangfang Li,Fan Tian,Han Tang,Rong Chen
Loose-packed flower-like BiOCl hierarchical nanostructures (HNs) assembled by thin nanosheets were successfully synthesized via a facile solvothermal method. Based on the matchability analysis of band structure of BiOCl and the molecular orbitals of the dyes, the RhB dye-sensitized heterogeneous BiOCl HNs system was established for MO degradation under visible light irradiation. The mechanism of MO degradation over RhB-sensitized BiOCl was also discussed according to the photocurrent and photoluminescence results. It was found that MO degradation efficiency over RhB-sensitized BiOCl HNs was obviously improved due to the generation of superoxide radicals (˙O2−) through the reduction of surface-adsorbed O2 molecules by the injected electrons on the conduction band of BiOCl HNs from the excited RhB molecules. This work may provide insight on better understanding the organic dye photodegradation process in RhB dye-sensitized BiOCl heterogeneous systems and explore a dye-sensitized semiconductor photocatalyst strategy for environmental remediation.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 4
·1-19
·
IF 2.8
Yao Bingdong,Zheng Guangwei,Luan Yina,Wang Lingxu,Xing Xuemin,Wang Yangyang,Liu Yan,He Jingxian,Zhang Fengqing
The morphology-controlled synthesis of nanostructured photocatalysts by an environmentally friendly and low-cost method provides a feasible way to realize practical applications of photocatalysts. Herein, Bi 2 WO 6 (BWO) nanophotocatalysts with mulberry shape, sheet-like, and round-cake morphologies have been successfully synthesized through a highly facile solvothermal process by simply adjusting the solvothermal temperature or utilizing selective addition of ethylene glycol as an orientation agent without using strong acids and bases and/or hazardous chemicals. The ratio of ethylene glycol and glacial acetic acid can affect the morphology and oxygen vacancy content of BWO, thereby influencing the photocatalytic performance. The photocatalytic activity of the as-prepared samples was evaluated by degradation of rhodamine B (RhB) and tetracycline under visible-light irradiation. The results indicated that all the BWO samples exhibited morphology-associated photocatalytic activity, and the sheet-like structure of BWO obtained via solvothermal treatment at 120 °C with ethylene glycol and glacial acetic acid ratio of 1:3 achieved the maximum specific surface area and possessed abundant oxygen vacancies, exhibiting outstanding photocatalytic activity for degradation of RhB and tetracycline. The degradation rate of RhB reached 100% within 20 min. To the best of our knowledge, this value is one of the most remarkable values for pristine BWO photocatalysts. Radical capture experiments demonstrated that hydroxyl radicals (·OH) play major roles compared with electrons (e − ) and holes (h + ) in the photocatalytic degradation process. A possible mechanism for the photocatalytic degradation of pollutants was proposed to better understand the reaction process. We believe that the more economical, efficient and greener methodology can provide guidance to develop highly efficient photocatalysts with favourable morphology and structure.
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Materials Advances
·
2022
·Vol. 3
·期 4
·2185-2190
·
IF 0
Ping Li,Mengyou Gao,Lei Sun,Huizhong Xu,Xiaochen Dong,Jianjian Lin
Coating a few layers of MoS2 nanosheets on a substrate is an effective approach to enhance catalytic activity for photocatalytic degradation. Herein, we fabricated heterostructured TiO2/MoS2 (H-TiO2/MoS2) with high structural stability via a simple two-step solvothermal approach. H-TiO2/MoS2 was composed of TiO2 as a hard core and MoS2 nanosheets as a shell, which could increase the electron transfer rate between TiO2 and MoS2 and enable active edge sites of MoS2 to be maximally exposed. Besides, H-TiO2/MoS2 indicated enhanced light absorption in the UV to Vis range when compared to TiO2 nanoparticles, and slightly lower than that of MoS2. This is beneficial for the enhancement of the photocatalytic degradation performance. Therefore, H-TiO2/MoS2 displayed a strong adsorption ability toward organic dyes and showed excellent performance in the photocatalytic degradation of rhodamine B with the concentration decreased by 99.4% due to the synergistically stimulative effect. The work will enlighten the development of highly efficient molybdenum sulfide-based heterostructured photocatalysts.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 4
·4209-4215
·
IF 3.056
Tong Huiyan,Jiang Qianyi,Zhong Xiaocong,Hu Xingshuai
In the recent years, microplastics have attracted much attention as new emerging environmental pollutants. Previously, several studies were performed to understand the source and fate of microplastics in the environment, organisms, and food webs. To track microplastics and improve their legibility, labeling them is a very effective method during laboratory experiments. This study presents an effective Rhodamine B dye (RhB) staining method for microplastics. The method is crucial for the visual observation of white or transparent plastics by dyeing them in purple or pink, as well as makes the microplastics to fluoresce under common microscope fluorescence filter ranges. Five types of microplastic polymers, namely polyethylene, polypropylene, polystyrene, polyvinyl chloride, and polyurethane were used as the test materials. The efficiencies of ethanol, acetone, and distilled water as possible solvents for dissolving RhB were investigated. Next, the fluorescence stability in various conditions was assessed. The results indicated that ethanol was the most appropriate solvent in dissolving RhB used in staining the microplastics. RhB was fluorescently stable under varying conditions (light and gut fluid) or different solutions (KOH, nitric acid, and saturated NaCl). Additionally, RhB staining exhibited an insignificant effect on the Raman spectra of the microplastics. Our proposed method is simple and robust and helps to visualize the different types of microplastic polymers tested in laboratory experiments, particularly the transparent, white, and small size microplastics.
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