Journal of Environmental Chemical Engineering
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2014
·
IF 0
Tingting Shen,Jinming Luo,Siyu Zhang,Xubiao Luo
Hierarchically mesostructured MIL-101 metal–organic frameworks (MOFs) were synthesized using anhydrous sodium acetate or hydrofluoric acid as a mineralizing agent and cetyltrimethylammonium bromide (CTAB) as a structure-directing agent. These new materials were then used to adsorb and remove the anionic dye methyl orange (MO) and the cationic dye methylene blue (MB) from contaminated water. The adsorption performance was systematically investigated and discussed. Experimental results revealed that the amount of MB adsorbed on MIL-101 that was prepared using sodium acetate is about 3.2 times the amount adsorbed on MIL-101 prepared using hydrofluoric acid, but quantities of adsorbed MO by the two adsorbents were nearly the same. Adsorbents synthesized with higher CTAB content had a higher content of the meso- and macro-scale pores, which favored the MB adsorption but impeded the MO adsorption. Dye adsorption is partially governed by the electrostatic interaction between the dye and the adsorbent, because the mineralizing agent can vary the charge carried by framework in a dye solution. The MB and MO adsorption kinetics followed a pseudo-second-order model, and the equilibrium dye adsorption data provided a good Langmuir model.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2024
·
IF 8
Yan Xu
The pursuit of clean energy generation and environmental preservation is of utmost importance for societal progress. However, couple clean energy production and pollution control is still a difficulty. In this study, a novel electrospun composite mat, with nano zero valent iron (Fe 0 , nZVI) encapsulated into polyacrylonitrile (PAN) nanofibers was acted as a catalyst. The activation energy (E a ) for the hydrolysis of NaBH 4 to produce hydrogen is 22 kJ·mol −1 , hydrogen atom utilization efficiency (HGE) of NaBH 4 is 60.80%. Three kinds of organic dyes 4-nitrophenol (4-NP), methylene blue (MB), and Rhodamine B (RhB) were served as the model pollutant, to construct NaBH 4 -organic system for energy production and pollution reduction. The NaBH 4 -organic system demonstrates a collaborative capability to simultaneously remove organic pollutants and generate hydrogen, with a coupling equilibrium point between the two processes. The hydrogen generation rate (HGR) and HGE increased with the concentration of pollutants increased. The degradation of 4-NP, MB, and RhB followed pseudo-first-order kinetics, with RhB degrading dosage 20 and 44 times higher than 4-NP and MB, respectively. H 2 and H· contributed to the organic degradation. nZVI directly participated in the formation H 2 and H·. PAN@Fe 0 possessed good recyclability and moderate cost. The degradation process adhered to the classical surface reaction controlled Langmuir-Hinshelwood (L-H) model. The integration of synergistic production capacity and pollutant degradation aligns well with the principles of green chemistry and sustainable development. This study demonstrates a novel approach to no precursor loss catalysts preparation, efficient production clean H 2 , advanced treatment of dye-containing wastewater, carbon neutral operation of sewage treatment plant.
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高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Yufeng Gan,Yuxiang Yang,Shunyan Ning,Yimin Liu,Yuezhou Wei,Xinpeng Wang,Deqian Zeng
Developing heterojunction photocatalysts is a critical method to augment the photocatalytic activity of single semiconductors. However, the instability of their heterostructure poses a significant challenge. Herein, a unique 0D/2D Mn 3 O 4 /CdS p-n photocatalyst has been prepared by a simple one-pot in-situ hydrothermal approach for H 2 production and methylene blue (MB) degradation. The optimized MC-0.18 (18 at% Mn) nanocomposite showed remarkable photocatalytic properties, producing a significantly higher H 2 generation rate of 1291 μmol· g −1 · h −1 , which was 13.7 and 9.2 times higher than that of pristine CdS and ex-situ synthesized MC-0.18-ex photocatalysts, respectively. MC-0.18 displayed the highest reaction rate at 0.0435 min −1 for MB degradation, which was approximately 2.6 and 6.3 times higher than CdS and Mn 3 O 4 , respectively. Active species capture experiments and ESR identified •OH and •O 2 − as the main substances involved in MB degradation. Importantly, MC-0.18 demonstrated excellent stability and reusability in photocatalytic H 2 production and MB degradation cycle tests. The formation of unique p-n heterostructures results in enhanced photoactivity due to the matched band alignment between ultrafine Mn 3 O 4 nanoparticles and CdS nanosheets , leading to a high charge separation capacity. This study offers a facile route to design p-n heterojunctions that have remarkable charge transfer abilities to promote H 2 production and degrade organic dyes.
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Soft Matter
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2018
·Vol. 14
·期 36
·7516-7525
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IF 3.709
Ming Duan,Jiayi Wu,Yan Xiong,Shenwen Fang,Jie Chen
Different molecular structures lead to different adsorption performances. In this work, the adsorption behavior of two organic dyes, namely, crystal violet (CV, triphenylmethane dye of symmetric structure) and methylene blue (MB, azo dye of linear structure), were investigated, characterized and differentiated at the silica/water interface using the total internal reflection induced near field evanescent wave (TIR-NFEW) platform. According to the change in the evanescent wave intensity and following Beer's law, the adsorption behaviors of CV and MB can be monitored real time and sensitively. On one hand, the Langmuir adsorption model was applied to obtain the related thermodynamic data (including adsorption equilibrium constant (Kads) and adsorption free energy (ΔG)). With ΔG(MB) = −25.7 ± 1.7 kJ mol−1 < ΔG(CV) = −21.5 ± 0.6 kJ mol−1 < 0, the linear MB showed a higher spontaneous adsorption ability than the symmetric CV at the silica/water interface. On the other hand, a two-step adsorption kinetic model was applied to obtain the dynamics data including the linear adsorption rate constant (k1) and the exponential adsorption rate constant (k2). With k1(CV) < k1(MB) and k2(CV) ≈ k2(MB), MB diffused faster than CV at the first diffusion step but had nearly the same interaction speed as CV in the second adsorption step. A molecular-aligned-mechanism was successfully proposed to describe the interfacial interaction process for both CV and MB that includes molecular reactions involving electrostatic attraction of type I SiO− and H-bonds of type II SiOH. This work provides new insights into the molecular-level interpretation of the adsorption of the azo and triphenylmethane dyes at the silica–water interface.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2017
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IF 4.217
Weiwei Huang,Yonghua Hu,Yaoyue Li,Yanbo Zhou,Dechao Niu,Zhongfang Lei,Zhenya Zhang
The increasing worldwide pollution of nature waters with endocrine disrupting chemicals (EDCs), heavy metals and dyes has highlighted the need for versatile and effective removal approaches. In this study, a citric acid-crosslinked β-cyclodextrin polymer (CA-β-CD) was applied for simultaneous adsorption of bisphenol A (BPA), methylene blue (MB) and Cu 2+ , typical pollutants of EDCs, dyes and heavy metals, respectively. In a monocomponent system, the adsorption behaviors exhibited a monolayer maximum adsorption capacity (q m ) of 0.3636 mmol/g for BPA, and a heterogeneous q m of 0.9229 and 0.9155 mmol/g for MB and Cu 2+ , respectively. The multicomponent experiment indicated that BPA and MB adsorptions onto CA-β-CD were independent from each other, whereas MB and Cu 2+ competed over the same sites. An adsorption mechanism was proposed: each component of CA-β-CD played an essential role, the cyclodextrin cavities contributed to entrapment of non-polar BPA, and the surface carboxyl groups provided binding sites for polar MB and Cu 2+ . Adsorption performance of the polymer was unaffected by humic acid, a major component of natural organic matter. Overall, due to its green synthetic procedure, versatile and good adsorption performance, excellent recyclability and anti-jamming capacity, CA-β-CD has great potentials for practical applications in water purification.
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高影响因子
CHEMOSPHERE
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2018
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IF 4.427
Tingting Liu,Lu Jing,Lin Cui,Qingyun Liu,Xiaomei Zhang
With the development of dye production and printing industry, dyes wastewater has increased dramatically. The resulting environmental pollution problem is increasing seriously. In the present work, a porphyrin-based porous organic polymer (PPOPs-OH) was synthesized by using pyrrole and 2,6-dihydroxynaphthalene-1,5-dicarbaldehyde (DHNDA) as basic building block in situ. This method was cost- and time-efficient, without the participation of metal catalysts. Further reaction of PPOPs-OH with chlorosulfonic acid, a new sulfonic acid functional material (PPOPs-SO 3 H) was obtained with the increasing electronegativity and hydrophilicity. PPOPs-SO 3 H exhibit good adsorption capacity for methylene blue (MB) from water (980.4 mg g −1 ) and excellent selectivity for MB in the present of rhodamine B (RhB) and methyl orange (MO). Mechanism investigation revealed that electrostatic in comparison with π-π interaction is the prominent force in the absorption process. Recycling experiments found the absorption properties of PPOPs-SO 3 H did not reduce significantly after several cycles. As a consequence, our findings highlight an appealing opportunities for covalent organic polymers with their potential application as high-efficiency and robust adsorbents for pollutants removal and environmental protection.
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高影响因子
ELECTROCHIMICA ACTA
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2021
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IF 6.901
Songjian Deng,Yi Dai,Yue Situ,Defei Liu,Hong Huang
Electrocatalytic oxidation technology and dimensionally stable anodes are widely used in the field of organic dye wastewater treatment . Rational manipulation of microscopic morphology, surface chemistry, and electrode configuration on DSA is of prime importance to enhance its electrochemical performance in the electrocatalytic degradation of organic pollutants . Herein, a novel Ti/SnO 2 -Sb anode with a microsphere structure composed of nanosheet was prepared by the in-situ hydrothermal method . And this electrode was compared with a control sample prepared by the traditional thermal decomposition method in terms of microscopic morphology, chemical structure , and electrochemical performance in the degradation of methylene blue. Benefiting from the nanosheet structure, small grain size, and higher Sb 2 O 5 content, the electrode prepared by the hydrothermal method had a higher Oxygen Evolution Potential (2.09V), a smaller impedance (8.61Ω), and a larger Electrochemical Active Surface Area. And its removal rate of methylene blue reached 100% while the total organic carbon content reduced by 39.20% within 60 min, which is significantly superior to that of traditional thermal decomposition electrodes. This study highlights that the electrode prepared by single-step hydrothermal process shows more excellent catalytic performance than that by the traditional thermal decomposition process and the hydrothermal method has bright application prospects in DSA for electrocatalytic oxidation.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2024
·Vol. 31
·期 16
·24113-24128
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IF 0
Ma Xiaoxiao,Li Yutong,Du Yile,Chen Shuangli,Bai Yunfan,Li Lin,Qi Chuhua,Wu Pingping,Zhang Sijing
The presence of organic dyes in aquatic systems poses a significant threat to ecosystems and human well-being. Due to recycling challenges, traditional commercial activated carbon is not cost-effective. To address this, an imidazolate acid zeolite framework-8 (ZIF-8)-modified magnetic adsorbent (ZMPLB-800) was synthesized through the in-situ formation of ZIF-8 and subsequent carbonization at 800 °C, using magnetic pineapple leaf biochar (MPLB) as a carrier. The porous structure of ZMPLB-800 facilitates the rapid passage of dye molecules, enhancing adsorption performance. ZMPLB-800 exhibited remarkable adsorption capacity for methylene blue (MB) across a pH range of 3–13, with a maximum adsorption capacity of 455.98 mg g −1 . Adsorption kinetics and thermodynamics followed the pseudo-second-order kinetic model and Langmuir isotherm model. Mechanisms of MB adsorption included pore filling, hydrogen bonding, electrostatic interactions, π-π interactions, and complexation through surface functional groups. Additionally, ZMPLB-800 demonstrated excellent regeneration performance, recording a removal efficiency exceeding 87% even after five adsorption/desorption cycles. This study provides a novel strategy for treating dye wastewater with MOF composites, laying the foundation for waste biomass utilization. Graphical
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WATER SCIENCE AND TECHNOLOGY
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2017
·Vol. 77
·期 1
·91-100
·
IF 1.197
Chen Dan,Zhou Jun,Wang Hongyu,Yang Kai
There is an increasing need to explore effective and clean approaches for hazardous contamination removal from wastewaters. In this work, a novel bead adsorbent, polyvinyl alcohol–graphene oxide (PVA-GO) macroporous hydrogel bead was prepared as filter media for p -nitrophenol (PNP), dye methylene blue (MB), and heavy metal U(VI) removal from aqueous solution. Batch and fixed-bed column experiments were carried out to evaluate the adsorption capacities of PNP, MB, and U(VI) on this bead. From batch experiments, the maximum adsorption capacities of PNP, MB, and U(VI) reached 347.87, 422.90, and 327.55 mg/g. From the fixed-bed column experiments, the adsorption capacities of PNP, MB, and U(VI) decreased with initial concentration increasing from 100 to 400 mg/L. The adsorption capacities of PNP, MB, and U(VI) decreased with increasing flow rate. Also, the maximum adsorption capacity of PNP decreased as pH increased from 3 to 9, while MB and U(VI) presented opposite tendencies. Furthermore, the bed depth service Time (BDST) model showed good linear relationships for the three ions' adsorption processes in this fixed-bed column, which indicated that the BDST model effectively evaluated and optimized the adsorption process of PVA-GO macroporous hydrogel bead in fixed-bed columns for hazardous contaminant removal from wastewaters.
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Wei Zhang,Min Chen,Xinjian Cheng,Jie Yang,Jumei Li
In this study, we demonstrated an efficient solar photocatalyst, g-C 3 N 4 modified hollow Ag/ZrO 2 core–shell composites (Ag/hZrO 2 /CN) using polymethylacrylic acid (PMAA) nanospheres as sacrificial template. The optimized Ag/hZrO 2 /CN catalyst demonstrated substantial photocatalytic performance, achieving 97.6 % degradation of methylene blue (MB) and 99.5 % degradation of thiram (TRM) within 90 min under simulated sunlight using a 500 W Xe lamp. The improved property is likely attributed to the synergistic effect among three constituents and the effective segregation of photogenerated electron-hole pairs in ZrO 2 , g-C 3 N 4 and Ag NPs, as confirmed by photocurrent and EIS analysis. Based on free radical scavenging studies (e − , h + , OH and O 2 − ), the mechanism underlying the boosted photocatalytic activity was suggested. Moreover, Ag/hZrO 2 /CN presented excellent surface enhanced Raman scattering activity, achieving quantitative sensing of MB and TRM with limits of detection of 5 × 10 −8 and 10 −6 mol/L, respectively, and a favorable linear correlation between SERS intensities and logarithmic concentration (R 2 ≥ 0.97). Additionally, Ag/hZrO 2 /CN accomplished recyclable SERS detection of MB and TRM through stimulated sunlight irradiation, which is significant for the recyclable SERS detecting through fast sunlight-powered procedure.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Mengjia Sheng,Xiang Zhang,Zhen Song,Hongye Cheng,Zhiwen Qi
The rapid development of dye industry has led to a significant amount of wastewater discharged. As a widely-used dye, toxic and non-degradable methylene blue is becoming a serious threat to our ecosystem. Thus, wastewater containing methylene blue must be treated properly. Considering the strengths of ionic liquid (IL) and metal organic framework (MOF) in molecular separation, a convenient solution strategy is proposed in this work for designing and preparing IL@MOF composite adsorbent in order to efficiently remove methylene blue from water. As a kind of water-stable MOFs, UiO-66 was synthesized by a one-pot method under very mild conditions using deep eutectic solvent (DES) as reaction media instead of conventional organic solvents. The easily obtained UiO-66-DES has superior MB adsorption kinetics but limited adsorption capacity. To mitigate this weakness, a computational and systematic IL screening framework is developed. [EtOHMIM][PF6] is eventually selected from 3569 candidates and incorporated into the UiO-66-DES. The resulted IL@MOF composite maintains the fast MB adsorption while importantly increasing the adsorption capacity from 45.85 mg/g to 227.57 mg/g. Given 10 mg/L MB solution, the removal rate is improved from 34% to 91% in 5 minutes. Meanwhile, the adsorption capacity is almost unchanged after 5 regeneration cycles, which offers great potentials for practical applications. Finally, the detailed mechanism analysis reveals that the loaded IL introduces new adsorption sites with stronger interactions with MB. These results show that the [EtOHMIM][PF6]@UiO-66-DES composite resulted from DES-assisted MOF synthesis and IL-based post-synthesis is a promising material for efficient MB wastewater treatment.
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高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Zhenrui Yang,Jiyong Zhang,Wentao Zhang,Qin Zhou,Jiayuan Shen,Yi Huang
Herein, the Co 2+ -doped ZnO nanoarrays with high photocatalytic activity were grown on the stainless steel wire mesh (Co 2+ -ZnO@SSM) by the hydrothermal method , and the special micro-nano structure with high surface roughness was obtained through stearic acid (STA) surface modification for the superhydrophobicity. By changing the concentrations of STA, the hydrophilic and hydrophobic structure of Co 2+ -ZnO/STA@SSM could be controlled, and the water contact angle in air reached 154.9° when the STA concentration was 0.04 mol/L. In different oil/water mixtures, the Co 2+ -ZnO/STA@SSM showed excellent oil/water separation efficiency and separation flux, and after 16 separation cycles and bending tests, the separation efficiency remained above 89%. In addition, the Co 2+ -ZnO/STA@SSM still maintained excellent visible photocatalytic activity, and the photocatalytic efficiency for methylene blue degradation could reach 93% in water. This dual-functional Co 2+ -ZnO/STA@SSM membrane with visible-light photocatalysis and oil/water separation provides a potential purification strategy for the complex industrial wastewater.
研究领域:
材料科学
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环境工程
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纳米技术
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物理化学
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催化化学
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