RSC Advances
·
2023
·Vol. 13
·期 42
·29695-29705
·
IF 3.9
Hui Fui,Shumin Gao,Xinran Ma,Yiping Huang
Layered double hydroxides (LDHs) have been extensively investigated as promising peroxymonosulfate (PMS) activators for the degradation of organic pollutants. However, bulk LDHs synthesized using conventional methods possess a closely stacked layered structure, which seriously blocks active sites and yields low intrinsic activity. In this study, we exfoliated bulk CoAl-LDHs to fabricate CoAl-LDH nanosheets by alkali-etching and Ostwald ripening via a simple hydrothermal process in a KOH solution. The exfoliated LDHs possessed the typical nanosheet structure with more exposed active sites for PMS activation, and hence, boosted the degradation of the pollutants. CoAl-1 exhibited an outstanding catalytic performance as the PMS activator for rhodamine B (RhB) degradation with the apparent rate constant of 0.1687 min−1, which was about 3.63 and 5.02 times higher than that of commercial nano-Co3O4 and bulk CoAl-LDH, respectively. The maximum RhB degradation of 93.1% was achieved at the optimal reaction conditions: catalyst dose 0.1 g L−1, PMS concentration 0.3 mM, pH 7, and temperature 298 K. Further analysis of RhB degradation mechanism illustrated that singlet oxygen (1O2) dominated RhB degradation in the CoAl-1/PMS system, while ˙OH, ˙O2−, and ˙SO4− may mainly serve as the intermediates for the generation of 1O2 and were indirectly involved in the degradation. This study provides a promising strategy for developing two-dimensional LDH nanosheets for wastewater remediation.
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RSC Advances
·
2021
·Vol. 11
·期 49
·30503-30509
·
IF 3.361
Xiupei Yang,Lin Zhang,Dan Wang,Qian Zhang,Jie Zeng,Run Zhang
Developing a new photocatalyst for fast and highly efficient organic dye degradation plays an essential role in wastewater treatment. In this study, a photocatalyst graphite phase carbon nitride (g-C3N4) containing nitrogen defects (CN) is reported for the degradation of rhodamine B (RhB). The porous g-C3N4 photocatalyst is facilely synthesized through a polycondensation method and then characterized by X-ray diffraction (XRD), infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), N2 isotherm adsorption line, and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the g-C3N4 is evaluated through the degradation of RhB under visible light irradiation. The results show that photocatalytic activity of the nitrogen-defective g-C3N4 can be improved by optimizating washing conditions, including washing temperature, washing dosage, drying time, and drying temperature. With the prepared nitrogen-defective g-C3N4, decolourization of RhB is able to be completed within 20 minutes, in which the degradation rate is 1.7 times higher than that of bulk g-C3N4. Moreover, the nitrogen-defective g-C3N4 has high stability and reusability in the degradation of RhB. Photocatalytic degradation mechanism investigations by ultraviolet-visible absorption spectroscopy, radical trapping experiments and high-performance liquid chromatography (HPLC) reveal that RhB achieved complete mineralization through the photocatalytic degradation reaction mediated by superoxide radicals (˙O2−). This work thus provides a new approach for the preparation of photocatalysts for organic pollutants treatment in wastewater samples.
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Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 4
·1330-1342
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IF 5.693
Zhang Fuhao,Cheng Wei,Yu Zhuanghua,Ge Shengsong,Shao Qian,Pan Duo,Liu Bin,Wang Xiaojing,Guo Zhanhu
A novel nanocomposite (WO 3 /UiO-66) was successfully synthesized by the microwave hydrothermal method. The influence of the W:Zr molar ratio on the WO 3 /UiO-66 structure was explored in detail, and the photocatalytic activity of the nanocomposite for photodegradation of rhodamine B (RhB) was evaluated. The WO 3 /UiO-66 with a W:Zr molar ratio of 1:5 (WO 3 /UiO-66–5) exerted the most excellent photocatalytic performance, and the photocatalytic efficiency reached 96.6% after 100 min of simulated sunlight irradiation, thereby showing a higher photocatalytic performance than pure UiO-66 or pure WO 3 . In addition, the stability and reusability of the nanocomposite were studied by cyclic experiments, and the degradation rate of WO 3 /UiO-66–5 still reached 86.6% after 5 cycles. The mechanism underlying the photocatalytic degradation of WO 3 /UiO-66 was finally studied by quenching tests, and the crucial factor in the RhB degradation was hole (h + ), and the existence of the n–n heterojunction also promotes the degradation of RhB by nanocomposites. In this work, an effective method is provided for the preparation of photocatalysts that degrade organic dyes.
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RSC Advances
·
2019
·Vol. 9
·期 52
·30125-30133
·
IF 3.049
Lili Xu,Hongbo Suo,Renmin Liu,Houmei Liu,Hongdeng Qiu
In this study, a novel magnetic composite (Fe3O4@CS/GO/Ag) modified with chitosan (CS), graphene oxide (GO) and Ag nanoparticles (Ag NPs) was successfully prepared as an efficient adsorbent for detection of rhodamine B (RB) combined with a fluorescence technique. The properties of the magnetic composite were confirmed by field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, and vibrating sample magnetometry. The components of Fe3O4@CS/GO/Ag endowed it with excellent extraction performance and convenient operation. The main parameters affecting extraction and desorption efficiency were all investigated systematically. Under the optimized experimental conditions, the proposed method showed linear ranges (0.2–6.0 μg L−1) with R2 = 0.9992. The limits of detection (LODs) and quantification (LOQs) were 0.05 and 0.2 μg L−1 (n = 3), respectively. Fe3O4@CS/GO/Ag exhibited outstanding extraction efficiency for RB, compared with CS-coated Fe3O4 nanoparticles (Fe3O4@CS) and GO-modified Fe3O4@CS (Fe3O4@CS/GO). The applicability of the proposed method was investigated by analyzing four real samples (waste water, soft drink, shampoo, and red pencil) and the spiked recoveries ranged between 94% and 97% with RSD ranging from 3% to 6%, which showed that the proposed method had satisfactory practicability and operability.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Siqi Wang,Lishu Shao,Yafei Sang,Jianhan Huang
Herein, we prepared a series of hollow hyper-cross-linked polymer (HCP) microspheres with a hollow core–shell structure via the hard-template method, and the as-prepared HCPs were employed for rhodamine B (RB) adsorption and CO2 capture. The results indicate that the porosity of the HCPs can be easily tuned and the hollow microspheres are favorable for the fast mass transfer of RB in the pore channels; accordingly, the adsorption equilibrium can be attained quickly. In addition, the hollow microspheres are helpful for increasing the equilibrium capacity. The RB adsorption shows that HCPs-5% holds the best capacity (1400 mg/g) and acceptable equilibrium time (60 min). On the other hand, the CO2 adsorption exhibits that HCPs-5% holds the highest CO2 uptake (99.0 mg/g) and the ultramicropores play important roles in the adsorption. The HCPs hold moderate isosteric heat of CO2 adsorption (24.4–35.0 kJ/mol) and exhibit excellent recycling performance.
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Analytical Methods
·
2015
·Vol. 7
·期 12
·4965-4970
·
IF 1.821
Yinhui Yi,Heng Sun,Gangbing Zhu,Zhen Zhang,Xiangyang Wu
Due to being harmful to the human health, the qualitative and quantitative determination of rhodamine B (RhB) is of great significance. In this paper, per-6-thio-β-cyclodextrin functionalized nanogold/hollow carbon nanospheres (β-CD-AuNPs/HCNS) nanohybrids were prepared and then applied successfully for the highly sensitive electrochemical detection of RhB. Due to the synergetic effects from the HCNS (excellent electrochemical properties and large surface area), β-CD (high host–guest recognition and water-solubility) and AuNPs (excellent electrocatalytic activity), the oxidation peak currents of RhB on the β-CD-AuNPs/HCNS modified glassy carbon electrode (GCE) are much higher than those on the AuNPs/HCNS/GCE and bare GCE. The β-CD-AuNPs/HCNS/GCE has a linear response range of 4.79–958.00 μg L−1 with a detection limit of 0.96 μg L−1 for RhB.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Xia Cheng,Xinyan Xiao,Fei Wang,Ting Lu,Yu Zhang
Photocatalysis is extensively implemented in organic pollutant degradation, and the critical point is to develop outstanding and stable photocatalysts. Herein, the synthesis of coral reef-like α-Bi2O3/BiOBr heterostructure photocatalysts involves the in situ growth of BiOBr nanosheets onto α-Bi2O3, with the latter derived through calcination utilizing a bismuth-based metal–organic framework (CAU-17) as the precursor. Under simulated sunlight, the 20% α-Bi2O3/BiOBr heterojunction degraded nearly 97.7% of RhB in 60 min, while pure α-Bi2O3 and BiOBr nanosheets degraded only 7.8 and 65.3%, respectively. Furthermore, the 20% α-Bi2O3/BiOBr nanocomposite exhibited superior recycling stability, degrading 86.6% RhB after four cyclic experiments. This is attributed to the fact that the nanoscale α-Bi2O3 material obtained by calcination can retain the exoteric diffusion channels of CAU-17, making α-Bi2O3/BiOBr heterojunctions have an enormous specific surface area, providing more adsorption sites and promoting their photocatalytic capacity. Free radical capture tests and electron paramagnetic resonance measurements indicated that h+ and •O2– were the primary active substances during photodegradation. On the basis of that, a feasible photodegradation mechanism of type II α-Bi2O3/BiOBr heterojunctions was proposed. This study opens up the possibility of designing type II heterojunctions with MOFs as precursors for dye degradation.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Zehao Li,Wangzhe Xia,Rui Qin,Fangping Wu,Zhihan Cai,Jianhong Wu
In the domain of water treatment, photocatalytic degradation presents a compelling approach. However, the quest for photocatalysts that exhibit superior solar energy absorption and conversion remains a challenge. We explore rod-shaped bismuth-rich chalcohalide photocatalyst BiSCl–Bi 6.88 S 8·64 Cl 3.36 by simple temperature control and demonstrate the proficiency in degrading organic pollution under visible light. BiSCl–Bi 6.88 S 8.64 Cl 3.36 nanorods manifest a composition-tailored band gap, effectively spanning the visible spectrum. Remarkably, in the absence of cocatalysts and sacrificial agents, BiSCl–Bi 6.88 S 8·64 Cl 3.36 exhibit exceptional photocatalytic degradation rate of 99.8%, which is comparable to that of BiSBr (98.6%). Moreover, the photodegradation rate of BiSCl–Bi 6.88 S 8·64 Cl 3.36 (0.091 min −1 ) is higher than that of BiSBr (0.048 min −1 ). The rate position it among the most effective known photocatalysts, with the generation of superoxide anion radicals (•O 2 − ) and photogenerated holes (h + ) as the primary active species. Notably, the enhanced photocatalytic activity of BiSCl–Bi 6.88 S 8·64 Cl 3.36 is attributed to the high number of Bi centers and the higher electronegativity, which induces a more polar crystal structure.
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CATALYSIS LETTERS
·
2024
·
IF 2.3
Feng Guo,Wang Xu,Wang Yajie,Sun Hongxin,Li Guohua
In PMS catalytic oxidation studies, we design and prepare a Mn 3 O 4 /CuO (CMO-2) composite catalyst using metal–organic frameworks (MOFs) as precursors. Compared with Mn 3 O 4 , its activated per-oxy-monosulfate activation catalyzed the degradation of pollutants with nearly six times higher activity efficiency. The experimental findings demonstrate that CMO-2 derived from metal–organic frameworks offer the advantages of wide adaptability to solution pH, along with improved versatility, stability, and recyclability. Further experiments involving radical scavenging, electrochemistry, and electron spin resonance (EPR) techniques confirm that the CMO-2 derived from MOF structures exhibit more significant interfacial engineering effects. This leads to an expansion of active interfaces, enhancing the accessibility and dispersion of active sites. Consequently, it significantly improves the efficiency of electron-transfer reactions and promotes a wide range of reactive oxygen species (ROSs), including SO 4 •− •OH and 1 O 2 . Graphical Abstract Based on the synergistic effect of copper-manganese bimetallic, the copper-manganese composite catalyst (CMO-2) prepared by doping 0.5 g of Cu-MOF showed the best catalytic activity in activating PMS, and the resulting ROS S could efficiently degrade organic pollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qiancheng Zheng,Huayu Zhang,Jun Li,Xingtong Yu,Xinyi Gao,Zhengbao Wang
Hierarchical and two-dimensional (2D) zeolites have drawn much attention in catalysis and separation process due to their fast mass transfer. However, the facile manipulation in controllable mesopore volumes and morphologies for hierarchical nanozeolites is full of challenges. Herein, a facile strategy is presented for the synthesis of single-crystalline 2D hierarchical MFI zeolite nanosheets (HNSs) with tunable mesopore volumes through the amino acid-assisted crystallization of nucleated amorphous silicon precursors (NASPs). The tailored synthesis of HNSs with controllable aspect ratios (( L c + L a )/ L b ), b -axis thicknesses (a few tens of nanometers) and mesopore volumes is achieved by adjusting the preparation of the NASPs and the amount of amino acid in the synthesis mixture. The HNSs exhibit large BET surface area (>400 m 2 g -1 ), high micropore volume (0.16–0.18 cm 3 g −1 ) as well as rich mesopore volume (>0.10 cm 3 g −1 ), indicating the high crystallinity of the hierarchical zeolite nanosheets. Specially, the higher adsorption capability and faster adsorption rate for the dye (Rhodamine B) adsorption demonstrate the excellent performance of the hierarchical zeolite nanosheets, which exhibits the maximum adsorption capacity of 115.7 mg g −1 . The controllable manipulation of mesoporous volumes and morphologies in MFI zeolites represents a significant contribution to the field of zeolite microstructure engineering.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Xinpeng Chen,Aijing Li,Lili Xing,Jiapeng Wang,Yurong Sun,Yifeng Wang,Guoqiang Chen,Tieling Xing,Lei Xu
Photocatalysis is based on ultraviolet light, while piezoelectric catalysis is powered by mechanical energy and piezoelectric effect. Both types of catalysis have been employed in degradation of pollutants and wastewater treatment. In this work, molybdenum diselenide (MoSe 2 ) was mixed with polyvinylidene difluoride (PVDF) to produce a MoSe 2 /PVDF composite foam with flexible porous structure. The composite foam exhibited excellent light absorption and effective Rhodamine B (RhB) removal. MoSe 2 could enhance the piezoelectric catalytic performance of PVDF by promoting the formation of β-phase. In addition, this composite foam piezo-photocatalytically removed more than 99.1 % of RhB within 60 min under light irradiation and stirring. In electron spin resonance (ESR) and capture active species experiments, it was found that •OH, •O 2 − and h + contribute to the removal of RhB. The Fukui function based on Density Functional Theory (DFT) and mass spectrometry were used to identify the degradation pathway of RhB. The evaluation results of toxicity evaluation software (T.E.S.T.) to degradation intermediates of RhB showed that the overall toxicity gradually decreased in degradation process. Due to the existence of MoSe 2 , the composite represented an outstanding evaporation rate (2.23 kg m −2 h −1 ) under one solar irradiation. Furthermore, MoSe 2 /PVDF also exhibited remarkable antibacterial properties, which is favorable to its practical application. This work presents a novel high-performance piezo-photocatalysis material, which proposes innovative environmental governance strategies for obtaining clean water through multi-component synergism.
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WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 3
·1-14
·
IF 3
Li Yunfei,Liu Zhichang,Ren Hongwei,Chen Chunmao
The dyeing industry wastewater has greatly hampered the ecological environment. The carbon quantum dots (CQDs) is a promising catalyst for photocatalytic degradation. To control the specified structure of CQDs, a designable-green deep eutectic solvents (DESs) was targeted as the precursor. In this work, a copper-doped solid-state Cu-CQDs was successfully prepared by combustion method from glycerol/choline chloride/CuCl 2 ·2H 2 O DESs, and characterized by Fourier transform infrared spectroscopy, XRD, XPS, UV–Vis spectroscopy, and fluorescence spectroscopy. The analysis revealed that the metallic copper-doped Cu-CQDs have better morphological and structural properties and exhibit good optics characteristics. The prepared CQDs were applied to the photocatalytic degradation of Rhodamine-B (RhB). It was found that the ⋅O 2 − was the main active specie, and it can efficient degrade RhB up to 95%. Graphical abstract
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