CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Donghui Han,Jinquan Wan,Yongwen Ma,Yan Wang,Mingzhi Huang,Yangmei Chen,Dongya Li,Zeyu Guan,Ying Li
Oxidative decolorization of Orange G (OG) in Fe(II)/(S,S)-ethylenediamine-N,N′-disuccinic acid (EDDS)/persulfate (PS) process was investigated. Hydroxylamine was combined to accelerate the Fe(II) recovery for improvement of PS activation. Effects of the reagents dosage, pH, and hydroxylamine adding mode were evaluated in batch experiments. All the decolorization experiments were performed at 25 °C within 180 min and with initial OG concentration ranging from 0.25 to 2.5 mM. The results indicated that EDDS decreased the Fe(II) accessibility to 11.9% at the molar ratio of EDDS/Fe(II) = 1/1 and could improve the OG decolorization by slowing down the Fe(II) depletion rate. The addition of hydroxylamine was effective in further enhancement of the oxidative ability and 98% OG decolorization was obtained rapidly with only 50.6% PS decomposition when hydroxylamine/Fe(II) = 8/5. The combination of EDDS and hydroxylamine could expand the effective pH range up to 7. The hydroxylamine adding mode also played a significant role and OG decolorization efficiency was 49.4%, 67.7% and 70.7% when adding times was 1, 3 and 5, respectively. In addition, under the condition of PS/Fe(II)/hydroxylamine = 5/10/16, OG suffered incomplete decolorization up to 71.8% due to the insufficient PS dosage, while a decline of OG decolorization was observed as well when PS/Fe(II)/hydroxylamine = 80/10/16 because of the intensive consumption of hydroxylamine and hydroxyl radicals ( OH) by excessive PS. The radicals characterization via electron spin resonance (ESR) technique was also conducted and the results indicated hydroxyl radicals were the predominant oxidative species in studied processes.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2016
·
IF 3.976
Mei-Qiang Cai,Yi-Zu Zhu,Zong-Su Wei,Jian-Qiang Hu,Sheng-Dong Pan,Rui-Yang Xiao,Chun-Ying Dong,Mi-Cong Jin
Bimetallic oxide CuFeO 2 as a new heterogeneous catalyst has shown much higher catalytic ability for activating peroxide than single-metal oxides. The present work demonstrated a synergistic microwave (MW) enhanced Fenton-like process with CuFeO 2 for rapid decolorization of azo dye Orange G (OG). The MW irradiation dramatically enhanced the OG degradation efficiency, achieving 99.9% decolorization within 15 min at pH 5. The XRD analysis of reused CuFeO 2 , together with metal leaching tests, indicated merits of recycling for CuFeO 2 . The subsequent surface element analysis by XPS for fresh and used CuFeO 2 showed a complex network for reactions between copper-iron redox pairs and surface hydroxyl groups, leading to a synergistic Fenton-like system accelerated by MW irradiation. In the CuFeO 2 initiated Fenton-like reactions, several oxidant species (i.e., OH, O 2 − , electron hole , and Fe IV O) responsible to the OG oxidation were identified by quenching experiments, showing the MW generated high temperature and “hot spots” enhanced the yield of OH by generation of electron-hole pairs. Further, the 26 detected degradation products confirmed the OH dominant oxidation of OG. This study shows that the MW-enhanced Fenton-like reaction using CuFeO 2 has potential applications for rapid decolorization of dye effluent.
研究领域:
环境科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 26
·期 2
·1445-1454
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IF 2.8
Wang Daiyao,Zou Jing,Cai Huahua,Huang Yixin,Li Fei,Cheng Qingfeng
Advanced oxidation processes offer effective solutions in treating wastewater from various industries. The process of alkali-activated hydrogen peroxide (H 2 O 2 ) was superior for the treatment of alkaline dye wastewater because no additional reagents were required except H 2 O 2 . However, an important and interesting phenomenon had been observed that the primary reactive species were found different for degrading organic pollutants with the process of alkali-activated H 2 O 2 . Azo dye of Orange G (OG) and triphenylmethane dye of Rhodamine B (RhB) were chosen as the target organic pollutants. The influences of various parameters on OG and RhB degradation by alkali-activated H 2 O 2 were evaluated. Furthermore, different scavengers, including ascorbic acid, methanol, t -butanol, isopropyl alcohol, furfuryl alcohol, and nitro blue tetrazolium, have been tested to identify the active species involved in dye degradation, and it was found that O 2 ·− was mainly responsible for degrading OG, while HO 2 − anion was the primary oxidant for degrading RhB.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Linlin Huang,Xuwen Zhang,Tingting Liu,Lin Wang,Lixin Li,Da Li,Tao Sheng,Zilong Dong,Xinyue Zhao
A coal tar pitch-based porous carbon adsorbent (CPA) was synthesized through a straightforward method involving the heating of a mixture of KOH and coal tar pitch (CTP). This CPA exhibited a high surface area of 1811.2 m2 g–1 and a large pore volume of 0.94 cm3 g–1 when prepared with a CTP to KOH mass ratio of 1:4 at 800 °C. Parameters such as the heating temperature and activator dose were optimized to enhance the adsorption efficiency. The prepared CPA was extensively characterized by SEM, XRD, FTIR, and BET measurements. Notably, CPA presented a distinct adsorption performance for Orange G (OG), achieving a maximum adsorption capability of 449.7 mg g–1. Kinetic studies indicated that the adsorption process followed the pseudo-second-order model, while the adsorption isotherm data demonstrated that both chemical and physical interactions favored OG adsorption. Thermodynamic analysis revealed that the adsorption of OG on CPA was spontaneous and exothermic and increased the entropy. Density functional theory (DFT) calculations provided insights into the adsorption mechanism, highlighting electrostatic interactions, hydrogen bonds, and π–π interactions as the dominant processes governing OG adsorption onto the adsorbent.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2015
·Vol. 42
·期 2
·481-497
·
IF 1.221
Wang Chenxi,Wan Jinquan,Ma Yongwen,Wang Yan
The degradation of Orange G (OG) by persulfate (PS, S 2 O 8
2− ) activated with dual catalysts that combined zero-valent iron (ZVI) and copper oxide (CuO) was investigated through batch experiments. Effects of pH, initial OG concentration, persulfate dosages, and dosages of dual catalysts on OG degradation were also examined. Higher persulfate concentration and catalysts dosages resulted in higher OG degrading rates. The OG degradation was higher under acidic conditions (pH 3.0 and 5.0) when compared to alkaline conditions. The constituents and the morphology of the catalysts coating before and after reaction were also investigated with X-ray diffraction and scanning electron microscopy. Radical mechanism was studied and three radical scavengers [methanol (MA), tert-butanol (TBA), phenol] were used to determine the type of major active species taking part in the degradation of OG. It was assumed that the \({\text{SO}}_{4}^{ \cdot - }\) or \({\text{HO}} \cdot\) played a major role in the OG degradation. In conclusion, the ZVI/CuO/PS system is a good candidate for use in detoxifying water contaminants.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
Separations
·
2022
·Vol. 9
·期 12
·391
·
IF 3.344
Zhiquan Yang,Chong He,Wenning Liao,Xinyi Zhang,Wanhui Liu,Baosheng Zou
Dye effluent damaged the water environment and human health with its massive discharge. In order to eliminate dye from the water environment, a variety of adsorbents were used to investigate dye removal. Graphene oxide (GO) attracted extensive attention due to its excellent surface property in the degradation of dye wastewater. Modified GO with multifunctional groups helped to improve adsorption performance. 3-Aminopropyltriethoxysilane modified GO (AS-GO) was fabricated for the removal of Orange G (OG) in this study. The results showed that AS-GO had an excellent adsorption ability of OG. During the reaction process, the maximum adsorptive capacity of OG was up to 576.6 mg/g at T = 313 K and pH = 3 with the initial OG concentration of 100 mg/L and the initial adsorbent dose of 2.5 g/L. The adsorption kinetic process of AS-GO conformed to the pseudo-second-order and Langmuir models. The spontaneous and endothermic adsorption of OG occurred in the adsorption process. The main adsorption mechanisms were electrostatic, π–π and hydrogen bonding interactions in the reaction process. After four cycles of AS-GO, it maintained high removal efficiency owing to its remarkable stability. The scheme of GO modified with AS could hinder the agglomeration of GO and provide more active sites, which would further enhance the adsorption properties and expand its application in water purification.Keywords:adsorption;Orange G;graphene oxide;3-aminopropyltriethoxysilane
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Micro & Nano Letters
·
2021
·Vol. 16
·期 10
·500-505
·
IF 1.102
Dejuan Fa,Yuqing Miao
By hydrothermal reaction, the hydrangea-like ZnS/ZnIn 2 S 4 microspheres were prepared in the presence of thioacetamide. X-ray photoelectron spectroscopy and high resolution transmission electron microscopy confirmed that the ultra-long nanowires are composed of ZnS and ZnIn 2 S 4 . Scanning electron microscopy showed the morphology of ultra-thin nanosheets with an average thickness of 8.5 nm cross from inside to outside, forming ZnS/ZnIn 2 S 4 microspheres with a porous diameter of about 2.8 μm. Nitrogen adsorption desorption isotherm determined that the BET specific surface area of the microspheres was 109.19 m 2 /g which showed that they have a large specific surface area. The obtained ZnS/ZnIn 2 S 4 microspheres showed broad absorbance ranging from UV (200 nm) to visible (520 nm) with low indirect band gaps of 2.08 eV. It leads to outstanding visible-light-driven photocatalysis for the degradation of xylenol orange (XO) and thymol blue (TB) in water, and the two dyes were almost completely degraded after 60 and 135 min, respectively. This provides new potential to explore nanomaterials for efficient photo-driven degradation of organic dyes under visible light irradiation.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Xinyu Zheng,Huaili Zheng,Yuhao Zhou,Yongjun Sun,Rui Zhao,Yongzhi Liu,Shixin Zhang
Wastewater containing dyes poses a severe threat to human health and to environmental safety. Hence, finding an effective way to treat this wastewater has attracted wide attentions. In this study, quaternary ammonium group-rich magnetic nanoparticles (MNPs), Fe 3 O 4 @SiO 2 -MPS-g-DAC (FSMD), were facilely prepared by grafting polymerization and served as a cationic adsorbent to remove anionic dye Orange G from aqueous solutions. Being compared with Fe 3 O 4 @SiO 2 -MPS MNPs, the adsorption capacity of FSMD MNPs was notably enhanced and it could be maintained in a high level under a wide solution pH range. The dependency on pH and the sensitivity to ionic strength indicated that the main adsorption mechanism was the electrostatic interaction. The adsorption kinetics followed the pseudo-second-order model, and the adsorption isotherms were well described with the Langmuir model. According to the thermodynamic analysis , the adsorption process was spontaneous and endothermic. FSMD MNPs were proved to have advantages of fast adsorption rate, high adsorption capacity, easy separation ability under external magnetic field, and satisfactory reusability, therefore they can be applied in the removal of anionic dyes from wastewater.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2016
·
IF 2.848
Heng Lin,Yating Li,Xiaoyu Mao,Hui Zhang
The decolorization of Orange II by an electro-enhanced goethite (α-FeOOH) activating peroxydisulfate (PDS) process (EC/α-FeOOH/PDS process) is reported in this study. Sulfate radicals was produced by activating PDS with Fe(II), which was generated continuously from the cathodic reduction of Fe(III) on α-FeOOH surface. The decolorization of Orange II showed little dependence on the initial pH. The comparison of Orange II decolorization under different systems was investigated. The surface properties of α-FeOOH before and after reaction were investigated by X-ray Photoelectron Spectroscopy (XPS). The radical species generated in EC/α-FeOOH/PDS process were determined by Electron Paramagnetic Resonance (EPR). On the basis of the results, the mechanism of Orange II decolorization in EC/α-FeOOH /PDS process was proposed. The catalyst α-FeOOH maintained its high activity during repeated batch experiments. Response surface methodology (RSM) based on Box–Behnken statistical experiment design (BBD) was applied to analyze the experimental variables. The response surface methodology models were derived from the experimental results and the response surface plots of the pseudo-first-order decolorization rate constant were developed accordingly.
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
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 4
·1-19
·
IF 2.9
Gao Zhicheng,Zhang Lei,Shi Xin,Yang Jun,Wang Xunqiu
So far, the purification of dyes wastewater through adsorption and other economical and environmentally friendly methods had received great attention. Therefore, this study mainly discussed the role and rule of PA65 material in wastewater dye treatment. In the experiment, the effects of pH value of solution, initial dye concentration, amount of adsorbent and adsorption time on the removal rate of orange G were studied. It was found that under the conditions of pH < 6, initial dye concentration of about 70 mg·L −1 , amount of adsorbent of about 60 mg, and adsorption time of 120 min, good adsorption performance could be achieved. Under acidic conditions, the PA65 with a pore structure exhibited certain adsorption performance for anionic dyes and had higher selectivity for binary mixed dyes. FITR analysis confirmed the presence of amide groups and amino groups interacting with dye molecules. In addition, the experimental data was fitted by adsorption isotherms and adsorption kinetics model. The results showed that the Langmuir model best describes the equilibrium isotherm data, showing a maximum adsorption capacity of 63.17 mg‧g −1 , and the adsorption data follows the pseudo-second-order dynamics model. The thermodynamic properties revealed that the adsorption process was endothermic and spontaneous.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
Catalysts
·
2024
·Vol. 15
·期 1
·24
·
IF 3.8
Yaohui Xu,Yong Li,Zhao Ding,Yang Zheng
To further enhance the safety and energy efficiency of the Fe3O4preparation experiment, we proposed a strategy for synthesizing monodisperse Fe3O4microspheres through a one-step solvothermal process. In this environmentally friendly synthesis method, stable FeCl3∙6H2O was utilized as the sole raw material, while ethylene glycol, characterized by its high boiling point and favorable safety profile, served as the solvent. Additionally, inexpensive and readily available urea was selected to function either as a mineralizer or surfactant. Through this one-step solvothermal reaction, the target product of Fe3O4could be obtained without subsequent calcination under reducing or inert atmospheres, thereby enhancing experimental safety and promoting energy conservation. By controlling the amount of urea added, it became feasible to produce monodisperse magnetic Fe3O4microspheres characterized by complete crystallinity and high yield. Utilizing the as-synthesized Fe3O4as a catalyst, we investigated its photocatalytic activity against xylenol orange organic dyes along with its regeneration characteristics. When 40 mmol of urea was incorporated into the reaction mixture, the resulting Fe3O4sample exhibited optimal photocatalytic performance; a 20 mg/L xylenol orange solution became colorless and transparent after just 1.5 h of UV light irradiation. Furthermore, during five consecutive regeneration cycles, its catalytic activity could be restored to its initial level. Importantly, Fe3O4demonstrated excellent magnetic sensitivity properties that facilitated rapid targeted separation under an external magnetic field, providing convenience for recovery and collection purposes.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Fang Zhu,Huiqi Wu,He Zhang,Sridhar Komarneni,Jianfeng Ma
Here in, a special catalytic system of potassium persulfate (K 2 S 2 O 8 , PS) activated by Bi 2 MoO 6 –CuS composite was established for the orange II (OII) degradation under visible light. The Bi 2 MoO 6 –CuS composite was synthesized by a two-step hydrothermal and solvothermal methods. The structure, morphology, light absorption and photocatalytic properties of the composite were respectively characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–visible diffuse reflectance spectroscopy (UV–vis DRS). The removal efficiency of OII degradation in the Bi 2 MoO 6 –CuS/PS/vis system reached to 98% within 80 min, which was much higher than that of either Bi 2 MoO 6 or CuS alone. A feasible mechanism analysis of OII degradation was proposed and validated by simple classical quenching experiments and electron spin resonance (ESR) spectroscopy. The high removal efficiency by the nanocomposite could be attributed to highly active species of O 2 ·- , ·OH and SO 4 •− radicals in the Bi 2 MoO 6 –CuS photocatalytic oxidation system. Moreover, the composite material retained its activation performance even after 5 degradation cycles, which suggested its high stability.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）