Catalysts
·
2019
·Vol. 9
·期 3
·280
·
IF 3.444
Ruijia Lan,Wenbin Su,Jitai Li
A classic carbon material—expanded graphite (EG), was prepared and proposed for a new application as catalysts for activating peroxydisulfate (PDS). EG samples prepared at different expansion temperatures were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and other methods. It was observed that there existed a remarkable synergistic effect in the EG/PDS combined system to degrade Acid Red 97 (AR97). Unlike other carbon material catalysts, sp2carbon structure may be the main active site in the catalytic reaction. The EG sample treated at 600 °C demonstrated the best catalytic activity for the activation of PDS. Degradation efficiency of AR97 increased with raising PDS dosage and EG loadings. The pH of aqueous solution played an important role in degradation and adsorption, and near-neutrality was the optimal pH in this research. It was assumed that the radical pathway played a dominant role in AR97 degradation and that oxidation of AR97 occurred in the pores and interface layer on the external surface of EG by SO4·−and ·OH, generated on or near the surface of EG. The radical oxidation mechanism was further confirmed by electron paramagnetic resonance spectroscopy. The EG sample could be regenerated by annealing, and the catalytic ability was almost fully recovered.Keywords:sodium peroxydisulfate;expanded graphite;mechanism;degradation;acid red 97
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Ruoyu Dai,Yaoping Hu
Quantitative determination of hazardous synthetic colorants in food is quite essential for human health. Herein, a ratiometric fluorescence method is developed for sensitive and selective detection of acid red 18 (AR18) using green/red dual emissive carbon dots (g/r-CDs) as probes. The as-synthesized g/r-CDs exhibit two emission peaks at 508 and 610 nm under excitation of a UV light. When AR18 is added, the green fluorescence of g/r-CDs at 508 nm is quenched dramatically due to the strong inner filter effect; in contrast, the red fluorescence at 610 nm decreases much more mildly. The intensity ratio of I 610 /I 508 has a good linearity with the AR18 concentration over the range of 0.05–8.00 μM. A detection limit of 16 nM is obtained, much lower than the most values reported by former analytical methods. Based on the g/r-CD sensor, accurate determination of AR18 in drinks and candy is successfully realized, demonstrating the good practicability of the proposed method for AR18 monitoring in real samples.
研究领域:
分析化学
·
食品安全
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 2
·1-12
·
IF 3
Zhu Xiao,Yu Cao,Zhu Mingxin,Zhou Hua,Pan Shunlong
The advanced peracetic acid (PAA) oxidation technology has a wide application prospect in the field of wastewater treatment for its high efficiency, environmental protection and wide application. In this work, cobalt tetraferrote (CoFe 2 O 4 ) was used to activate PAA to degrade acid red B. The effects of CoFe 2 O 4 catalyst dosage, PAA concentration, initial pH value and anion on the decolorization efficiency of acid red B were investigated by intermittent single factor experiments. The optimal reaction conditions for the degradation of 0.1 mM acid red B in the CoFe 2 O 4 /PAA system were as follows: catalyst dosage of 0.008 g, PAA concentration of 1 mM, and initial pH = 7. After 30 min of reaction, the degradation rate of acid red B reached was as high as 99.5%. The coexistence of CoFe 2 O 4 /PAA with low concentrations of anions and humic acid (HA) had negligible effects on the catalysis of acid red B, while the coexistence with higher concentrations of HCO 3 − , H 2 PO 4 − and HA inhibited the degradation behaviors. Quenching experiments confirmed that there were a large amount of R-O• and a small amount of •OH in the CoFe 2 O 4 /PAA system, and 1 O 2 played an important role in the degradation process. After 6 cycles, the catalytic performance of CoFe 2 O 4 remained above 98.6%, showing stable catalytic performance, which were also confirmed by FTIR and XPS. This work provided a new way for effectively treating azo dye containing waste water.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Dandan Tang,Gaoke Zhang,Sheng Guo
This study determines the potential of manganese oxide (MnO x ) nanoparticles for the activation of peroxymonosulfate (PMS). The MnO x nanoparticles were prepared by a facile co-precipitation method and the degradation rates of acid red G (ARG) by the as-prepared catalysts in the presence of PMS were measured. The results showed that the Mn 3 O 4 nanoparticles with tetragonal structure exhibited high catalytic activity for the degradation of ARG by activating PMS to generate radicals. The effects of the operational parameters on the catalytic property of the obtained nanosized Mn 3 O 4 catalyst were investigated in detail. The catalyst exhibits excellent catalytic activity in a wide range of pH from 2 to 12. Moreover, it still maintained high catalytic activity even after five reaction cycles, indicating the good stability of the catalyst. In addition, radical quenching studies were carried out to ascertain the dominating radical species and a proper mechanism was also proposed.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2013
·
IF 2.004
Shi Wang,Yan-Yun Zhai,Qiang Gao,Wen-Jun Luo,Hua Xia,Cheng-Gang Zhou
A new strategy to retrieve chitosan-decorated carbon nanotube (CS/CNT) from aqueous dispersion was proposed. The CS/CNT, prepared via a “surface deposition–crosslinking” method, exhibited an aggregation microstructure with plentiful interstitial spaces. By introducing magnetic nanoparticle (MNP) into CS/CNT dispersion solution, MNP was embedded in the CS/CNT aggregates, which endowed the CS/CNT with magnetic retrievability. Using this strategy, a simple and convenient operation for the removal of anionic azo dye (acid red 18 (AR18)) was achieved by directly adding CS/CNT and MNP into the dye solution, where CS/CNT acted as an adsorbent and MNP enabled all CS/CNT aggregates to be magnetically retrievable. Effects of pH, ionic strength, contact time, temperature, and initial AR18 concentration on adsorption efficiency were investigated. Results showed that AR18 adsorption could achieve equilibrium quickly and the maximum adsorption capacity could be up to 809.9 mg·g–1 at 323.15 K. Full kinetic and thermodynamic investigations as well as isotherm analysis were also undertaken. Moreover, the reusability of magnetically retrievable CS/CNT was evaluated, and the result showed that the removal of AR18 was kept relatively constant (99.11 % to 99.76 %) in 10 consecutive cycles. The study suggests that the magnetically retrievable CS/CNT is a promising adsorbent for removal of anionic azo dyes from aqueous solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Chaoying Zhang,Yunguang Yu,Hong Wei,Kebin Li
AgCl was incorporated with clay montmorillonite to improve the individual catalytic or adsorption performance. A green method was proposed to synthesize AgCl/montmorillonite composite by intercalating silver-ammonia complexes into the interlayers of montmorillonite followed by reacting with HCl vapor to in situ form AgCl particles on montmorillonite. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscopy, transmission electron microscope, Brunauer–Emmett–Teller analysis, X-ray photoelectron spectra, and UV–vis diffuse reflectance spectrum. It was shown that AgCl not only intercalated into the interlamination of montmorillonite but also anchored on its exterior surfaces. AgCl on clay surface was cube-like particles, which were dominated by the higher activity of {1 0 0} planes. The photocatalytic activity of AgCl/montmorillonite (AgCl-Mt) composites were evaluated by degradation of azo dye Acid Red 18 (AR18) under UV-irradiation. AgCl in AgCl-Mt composites had an optimum amount. When 3CEC of silver-ammonia was used to prepare [Ag(NH 3 ) 2 ] + -exchanged Mt, the obtained 3AgCl-Mt had the best activity. The degradation of 50 mL AR18 at pH 6 with 1 g L −1 of catalyst only needed 10 min. The low pH and dye concentration, and high catalyst loading favored the removal of dye. Moreover, the superoxide radicals and holes were found to be major reactive species responsible for the photocatalytic degradation of AR18. PL revealed that besides reducing the aggregation of AgCl and tailoring morphology of AgCl, montmorillonite also suppressed the combination of photogenerated electron-hole pairs, and thus enhanced the photocatalytic activity and stability. This study may offer an efficient approach for fabricating silver-halide-based composite photocatalysts for environmental cleanup.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Wei-Xing Zhang,Lu Lai,Ping Mei,Yan Li,Yu-Hang Li,Yi Liu
A natural biosorbent prepared from wheat bran (WB) and multiple quaternary ammonium salts (MQAS) was used to remove dye (AR-18) from aqueous solution. The adsorption kinetics and thermodynamic mechanism of the adsorption of AR-18 on MQAS-WB were also examined. Results reveal that adsorption isotherm data can be well described by Langmuir model. The calculated thermodynamic parameters indicate that the adsorption is exothermic and spontaneous. The adsorption kinetics follows the pseudo-second-order model. MQAS-WB shows potential for large-scale wastewater treatment. Dynamic adsorption studies reveal that the dye removal efficiency of the packing column of MQAS-WB is higher than that of raw WB.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Yingzi Lin,Junjie Chen,Hao Li,Lei Chen,Baoling Yuan,Chunyan Shi,Siwen Li,Gen Liu,Yuefeng Xie
Acid red 73 (AR73) is a representative dye pollutant that poses a threat to the environment and human health. Effectively removing this type of pollutant by conventional processes is difficult. However, this study found that compared with UV/PDS, UV/O 3 , and PDS/O 3 , UV/O 3 /PDS composite system had the highest degradation effect on AR73. The degradation efficiency in the composite system reached 97.61% within 30 min, and the synergistic coefficients in the composite system were all greater than 1. In the UV/O 3 /PDS system, ·OH was the main free radical that mainly degrades AR73. The increase of PDS dosage promoted the degradation of AR73, but the increase of O 3 dosage was difficult to greatly improve the degradation of AR73 effect. The kinetic model of the apparent reaction rate was determined. The UV/O 3 /PDS system can efficiently degrade AR73 in a wide range of substrate concentrations and pH levels, and at the same time showed good adaptability to various concentrations of anions (Cl − , CO 3 2− , SO 3 2− , and C 2 O 4 2− ). Under raw water quality, the degradation effect of AR73 was still as high as approximately 90%. The theoretical attack site was obtained by DFT calculation , and the possible degradation pathway of AR73 was proposed based on the GC-MS spectrum and UV–Vis absorption spectrum . The attack of –N N- by ·OH, SO 4 − , and O 3 was proposed to be the main possible degradation pathway for AR73. Therefore, this study further improves the understanding of the UV/O 3 /PDS system and shows the potential applicability of this system in the treatment of dye wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yan Liu,Qiang Gao,Chen Li,Shu Liu,Kaisheng Xia,Bo Han,Chenggang Zhou
Adsorption using monolithic adsorbents is an attractive emerging technology for water treatment, but it still remains a great challenge to facilely combine microscopically a well-developed surface functionality with a macroscopic architecture. In this work, we reported a simple, low-cost, and effective method for constructing uniform coating of crosslinked polyethyleneimine (PEI) on monolithic melamine sponge (MS) through pre-modification with polydopamine (PDA), followed by a rotary evaporation-driven “crosslinking–surface deposition” process. Due to the amine groups-rich surface and highly open porous structure, the resulting monolithic adsorbent (PEI@PDA/MS) exhibited high adsorption capacities and fast adsorption kinetics toward Pb(II) (231.81 mg g −1 ; < 100 min) and acid red 18 (AR18, 464.53 mg g −1 ; < 180 min). Moreover, PEI@PDA/MS possessed excellent shape memory property and could be manually collected with tweezers, indicating its great operational convenience in recycling. Cyclic adsorption/desorption experiments confirmed its satisfying reusability. Continuous flow adsorption behaviors of the PEI@PDA/MS monolith were further investigated by directly using it as stationary phase, which also exhibited high removal efficiencies for Pb(II) and AR18. Besides, adsorption mechanisms based on the characterization analyses were also proposed. Our study provides an effective strategy for fabricating high-quality PEI-based monolithic adsorbents with great potential to be used in environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 49
·期 1
·23-42
·
IF 3.134
Lin Yingzi,Hou Ao,Li Hao,Shi Chunyan,Chen Lei,Yuan Baoling,Liu Yi,Wang Yu,Liu Xiaochen
Dye wastewater with high concentration, large molecular weight, complex structure, and certain toxicity has brought a serious burden to the environment. In this study, acid red 73 dye (AR73) was used as the model pollutant to compare the degradation effects of different systems on AR73. The influence factors of a UV/hydrogen peroxide/peroxydisulfate (UV/H 2 O 2 /PDS) composite system, such as H 2 O 2 dosage, initial concentration of AR73, initial pH value, anion concentration, and actual water, on the degradation of AR73 were investigated. Compared with other systems, the UV/H 2 O 2 /PDS composite system had the best degradation effect of AR73, with a degradation efficiency of 98.98%, which conforms to the pseudo-first-order reaction kinetic model, the pseudo-first-order reaction kinetic constant ( k obs ) is 0.1339 min −1 . And the synergy coefficients in this complex system were all greater than 2. Specifically, the degradation efficiency of the UV/H 2 O 2 /PDS composite system for AR73 was the highest when the initial pH was neutral. The presence of anions inhibited the degradation of AR73, and the real water reduced the degradation efficiency for AR73. Electron spin resonance (ESR) detection and free radicals capture test demonstrated that hydroxyl radical ( · OH) was the main reactive species in AR73 degradation, and its 80.66–84.93% contribution. With the destruction of the structure of AR73 by free radicals, anilines, phenols, and oxalic acid were found to be the main intermediate products during the degradation of AR73 by gas-phase mass spectrometry and UV–vis spectrograms. The changes in toxicity during the degradation of AR73 by the UV/H 2 O 2 /PDS complex system were also assessed.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 26
·12696-12702
·
IF 3.925
Jiaman Liu,Jiping Jia,Huaqiang Yu,Jialin Zhang,Ji Li,Honghua Ge,Yuzeng Zhao
Nanoporous carbon (NPC) with microporous, mesoporous, and macroporous composite structures was designed and a new electro-Fenton cathode material was prepared by loading NPC onto graphite felt (GF) in this paper. The surface morphology and electrochemical properties of this material have been analyzed. The results show that the NPC obtained by carbonizing the composite of multi-walled carbon nanotubes and zeolite imidazole skeleton-8 has rich porosity and large specific surface area, which promotes the two-electron oxygen reduction reaction. Compared with the original GF, the NPC/GF electrode loaded with NPC has a higher current response and a lower charge transfer resistance. This modification has significantly improved the performance of the cathode to produce H2O2. Under the optimum conditions, the H2O2 yield of the NPC/GF electrode is about 17 times higher than that of the original GF and the degradation rate of acid red 18 (AR 18, 100 mg L−1) can reach 98.18% within 2 hours. After eight cycles, the H2O2 output of the NPC/GF cathode did not decrease significantly and the degradation rate of AR18 was still higher than 95%, indicating that the NPC/GF electrode has good reusability and certain practical value.
研究领域:
材料科学
·
环境工程
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Yong Chen,Jiandi Huang,Yannan Ma,Hui Xu
The limitation of low energy density of carbon-based supercapacitors can be broken through introducing redox mediators into the electrolyte. Herein, biomass porous carbon CPPS-2 with a high specific surface area of 1649 m 2 /g was prepared by KOH activation. Capitalizing on the adsorption property of porous carbon, redox mediator, acid red 18 (AR18), was confined into the nanopores of CPPS-2 to fabricate the CPPS-2-18 electrode. After adsorbing 2.72 mg AR18, the specific capacitance of CPPS-2-18 is 568F/g at a current density of 1 A/g in 1 M H 2 SO 4 , which is as same as that of CPPS-2 in 1 M H 2 SO 4 + 10 mM AR18, however, the rate performance and coulombic efficiency of CPPS-2-18 are higher than those of CPPS-2. The results reveal that the redox reaction in nanopores of CPPS-2-18 is more reversible than that on the surface of CPPS-2. Meanwhile, the symmetric supercapacitor based on CPPS-2-18 achieves a maximum energy density of 23Wh/kg and power density of 6000 W/kg. Besides, the self-discharging behavior of CPPS-2 is restrained by confining AR18 into the nanopores.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）