SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Xiaoxue Yang,Xue Bai,Yuxuan Ma,Dan He,Xiaojing Wang,Yuwei Guo
In this investigation, CdS samples with different morphologies (one-dimensional rod-shaped CdS-R, two-dimensional thin layer CdS-P, three-dimensional nanospheres CdS-S) were synthesized by hydrothermal and solvothermal methods, respectively. Then, a photocatalytic regenerated active carbon adsorbent was obtained by assembling the prepared CdS samples into an alkali-activated covalent triazine-base framework (ACTF). The structure, morphology and chemical states of CdS and CdS-ACTF were characterized by XRD, SEM, TEM and XPS. By estimating the decontamination of tetracycline, CdS-P/ACTF composite displays the best removal rate (99.7% for 20 mg·L −1 initial tetracycline under 90 min simulated solar light irradiation). In addition, compared with the single-phase CdS, the hybrid material presents a good reusability with a still 80% degradation rate at successive 300 min of 5 runs tests under solar light illuminating, indicating its excellent structural stability and photo-regenerated ability. An adsorption and photo-regenerated mechanism was proposed in which ACTF contributes to the strong adsorption of contamination due to its ultra-high specific surface area and CdS contributes to solar light decomposition with a strong photocatalytic oxidative activity. In addition, the regenerated ability was further enhanced by inhibiting carriers’ recombination through a quickly electron transport, ascribing to the well electronic conductivity of ACTF. Consequently, it is highly desirable that CdS-ACTF could be used as a promising adsorbent to eliminate tetracycline residues from the environment and easily to be regenerated with solar light.
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
Materials Research Express
·
2019
·Vol. 6
·期 8
·085532
·
IF 1.449
Hongying Tang,Wulin Yang,Licai Fu,Jiajun Zhu,Deyi Li,Lingping Zhou
A series of novel nanoparticles-assembled Cu2O/Bi2O3 composites were synthesized by simple wet chemical reduction method. The synthesized materials were characterized by XRD, SEM, BET and FTIR. The microstructures are considered to be the nanoparticles-assembled mesoporous structure with large specific surface. The composited Bi2O3 refine the grain of Cu2O and increase the surface area of composites. When the molar ratio of composite is 5:1, the sample shows excellent adsorption capacity of removing methyl orange and the maximum adsorption capacity is 1533.2 mg g−1. The performance of adsorption is attributed to the synergistic effects of high specific surface area and electrostatic interaction. In this work, the adsorption kinetic was investigated, which follows the pseudo-second-order kinetic model for the adsorption of methyl orange. The Cu2O/Bi2O3 composites can be reused through further photocatalytic regeneration. The results indicate that the adsorption-photocatalysis have great potential in water treatment applications.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2021
·
IF 4.641
Chuanfu Song,Kunyuan Chen,Xin Jin,Xinyu Zhao,Guangrong Liu,Feifei He,Qiang Huang
The biochar-supported Cu 2 O/Cu composite (Cu 2 O/Cu/BC) was fabricated by direct pyrolysis of hemp hurds pretreated with KOH and CuCl 2 , in which the synchronous carbonization-activation-functionalization was achieved to produce copper-modified biochars. Cu 2 O/Cu/BCs were characterized by XRD , Raman, XPS , SEM and N 2 adsorption-desorption techniques. The adsorption methyl orange by Cu 2 O/Cu/BCs showed that the incorporation of Cu 2 O/Cu has improved the adsorption capacity. The adsorption obeyed the pseudo-second-order kinetic model and Langmuir isotherm. The maximum adsorption capacity reached 379.4 mg∙g -1 at 303.5 K. Furthermore, assisted with the photoactivity of Cu 2 O/Cu heterojunction the saturated adsorbent can be regenerated under simulated sunlight, and the re-adsorption capacity was still as high as 77.1% of the fresh adsorbent after six cycles. The regeneration efficiency was much better than traditional thermal regeneration and solvent treatment. This work should allow to provide a convenient preparation of functionalized biochars and to develop solar-driven, self-regenerative sorbents for water decontamination with high efficiency.
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
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2017
·Vol. 25
·期 7
·6729-6738
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IF 2.741
Wei Dong,Li Song,Fang Lei,Zhang Yan
The molecular imprinting technique combined with photocatalysis was used in the removal of fluoroquinolones. In this study, we prepared molecular imprinted polymers (MIPs) and investigated the adsorption and photocatalytic regeneration performance, followed by the effect of different environmental factors and photoproduct identification. Compared with non-imprinted polymers (NIPs) and P25, MIPs had a better adsorption performance towards norfloxacin with the removal efficiency of 77.1% in 1 h. pH, humic acid, and high valence ions had significant effects on the adsorption performance. Under neutral condition, the adsorption effect of MIPs was better than that of acidic and alkaline condition. The removal efficiency declined to 25.9% when pH reached 11. The removal efficiency gradually improved with the concentration of humic acid increasing. The adsorption efficiency of MIPs in surface water was only 12.6% lower than that of ultrapure water, which indicated that molecular imprinting process improved the anti-interference property. The photodegradation rate was 0.114 min −1 when the concentration of norfloxacin was 1 mg L −1 . Norfloxacin was oxidized with aldehyde group or hydroxyl. The adsorption removal efficiency of MIPs did not decline apparently after 11 adsorption-photocatalytic regeneration cycles, which suggested that the in-situ regeneration and sustainable use of MIPs were achievable in organic pollutant control.
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
PubMed
高影响因子
Desalination and Water Treatment
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2016
·
IF 1.272
Song Li,Lei Fang,Miaomiao Ye,Yan Zhang
For norfloxacin removal in aquatic environment, TiO2 particles (P25) were modified via surface molecular imprinting technique to improve the adsorption property and sustainable use by photocatalytic regeneration. Orthogonal experiment was adopted to quantify the significance of preparation factors and determine the optimum preparation conditions. The adsorption of norfloxacin on the molecular imprinted particles (MIPs), the non-imprinted particles (NIPs), and P25 fitted the second-order adsorption model and Langmuir model well. The MIPs showed a higher adsorption capacity toward norfloxacin than the NIPs and P25. The adsorption rate constant, maximum adsorption capacity, and Langmuir constant of the MIPs toward norfloxacin were 0.49 g mg−1 min−1, 2.99 mg g−1, and 2.4 L mg−1, respectively. Removal efficiencies for norfloxacin, ciprofloxacin, carbamazepine, and phenol by the MIPs were 76.99, 78.81, 7.87, and 2.68%, respectively, which indicated that the MIPs had higher affinity toward norfloxacin and fluoroquinolones with similar structures. Moreover, the MIPs exhibited the photocatalytic property and could be regenerated by UV irradiation with stable removal efficiency for norfloxacin in five adsorption–regeneration cycles.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Wenqian Song,Yuxin Wen,Guojun Kang,Wenqing Lv,Dekang Li,Haoquan Hu,Lijun Jin,Shijian Lu,Zhong Yan,Pengfei Liu
Amine-based solution absorption as the most promising and commercialized CO 2 capture method, attracted the increasing attention. However, its key lies in improving the CO 2 desorption performance while reducing the energy consumption in desorption. In this paper, HZSM-5 was dealuminated by sulfuric acid, further loaded by Fe 2 O 3 , Co 3 O 4 , NiO and ZnO via impregnation method and used in catalytic desorption of the blended amine solution of N-methyl-diethanolamine and piperazine. Results indicated that sulfuric acid leaching increased the number of acid sites and mesoporous surface area. When sulfuric acid reached 0.8 mol/L, the resultant catalyst (0.8H 2 SO 4 -HZ) improved the amount of the desorbed CO 2 by 10.26% and decreased the heat duty to 2128 kJ/mol CO 2 , with a reduction of 17.01% compared to non-catalytic system. The loading of metal oxides on 0.8H 2 SO 4 -HZ decreased surface area and changed acidity of catalysts. CO 2 desorption amount under catalysis of metal oxide modified M /0.8H 2 SO 4 -HZ followed the order of Fe/0.8H 2 SO 4 -HZ > Zn/0.8H 2 SO 4 -HZ > Ni/0.8H 2 SO 4 -HZ > Co/0.8H 2 SO 4 -HZ, whereas the relative heat duty was in order of Zn/0.8H 2 SO 4 -HZ > Co/0.8H 2 SO 4 -HZ > Ni/0.8H 2 SO 4 -HZ > Fe/0.8H 2 SO 4 -HZ. Fe/0.8H 2 SO 4 -HZ exhibited excellent catalytic performance, along with 12.82% increase in amount of CO 2 desorbed and reduction in heat duty to 2039 kJ/mol CO 2 , with a 20.49% decrease. Meanwhile, Fe/0.8H 2 SO 4 -HZ showed good stability after ten cycles and the addition of Fe/0.8H 2 SO 4 -HZ promoted CO 2 absorption. Suitable pore structure and abundant acid sites of the modified catalyst contributed to proton transfer and decomposition of carbamate. A possible mechanism for catalytic desorption over modified HZSM-5 was proposed. The work indicates that catalytic desorption by modified HZSM-5 catalyst is a promising way to decrease the energy consumption of amine solution regeneration.
研究领域:
化学工程
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环境科学
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能源化学
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催化化学
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气体分离
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材料科学
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工业催化
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Yue Qiu,Jiaping Yan,Xiaoling Liu,Yuting Pang,Yuting Ding,Fei Lyu
Patulin (PAT) is a hazardous mycotoxin frequently occurs in fruit industry. A reusable g-C 3 N 4 -SH@KG composite aerogel for PAT removal in a novel “dark adsorption-light regeneration” mode was prepared by thiol(-SH) functionalization and konjac glucomannan (KG) immobilization. The g-C 3 N 4 -SH@KG was characterized by SEM, FT-IR, XPS and UV–Vis DRS, and its PAT adsorption and photocatalytic regeneration behaviors and mechanisms were investigated. The g-C 3 N 4 -SH@KG exhibited good regeneration performance, maintaining 83% of PAT initial adsorption capacity (0.92 mg/g) after 5 “adsorption-regeneration” cycles. The adsorption process was endothermic and spontaneous. •OH and h + generated by photocatalysis were the main substances that degraded PAT into two products and regenerated -SH. The g-C 3 N 4 -SH@KG could effectively remove PAT without negative impact on juice quality. The study provided a new strategy for the regeneration of thiol-functionalized PAT adsorbents, and a new idea for the application of non-selective photocatalysis in the control of food contaminations.
研究领域:
食品科学
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环境工程
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生物化学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
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2020
·
IF 4.302
Yi Shang,Xing Li,Yanling Yang,Nan Wang,Xiaoxuan Zhuang,Zhiwei Zhou
Photo-responsive adsorption-photocatalysis nanocomposites are generally used in water and wastewater decontamination ; however, the prolonged adsorption capacity of composites and the role of adsorption in concomitant photocatalysis are typically neglected. These composites can be regenerated under light irradiation as their adsorption capacity decreases. Herein, a novel adsorption-photocatalysis bifunctional nanocomposite, Bi-doped TiO 2 supported on powdered activated carbon (Bi 2 O 3 /TiO 2 /PAC), was prepared using the sol-impregnation-hydrothermal procedure. Bi 2 O 3 /TiO 2 /PAC with a secondary calcination temperature of 700°C under a nitrogen atmosphere was selected for maximum adsorption capacity on Methyl Orange (MO). The composite displayed an excellent adsorption capacity and was easily separated and recycled. The results demonstrate that 71.2% photocatalytic regeneration efficiency could be attained under visible light irradiation for 1 hr at an intensity of 750 W/m 2 and pH 7. Characterization of the as-prepared Bi 2 O 3 /TiO 2 /PAC nanocomposite (700°C) indicates that it possesses a highly specific surface area and great optical properties , showing bifunctional adsorption-photocatalysis characteristics. The p-n heterojunction of the composite played a dominant role in the photocatalytic regeneration process, and effective degradation of MO could be achieved along with composite regeneration.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
ACS ES&T Water
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2024
·
IF 4.8
Ya-Meng Dong,Bin Li,Zi-Hang He,Qin-Chen Li,Tong Li,Chang Liu,Xing Zhang
Photocatalytic technology still faces significant challenges in removing trace concentrations of organic pollutants from wastewater. In this study, we synthesized Bi3O4Br/MXene (BOB/M) with a Schottky junction structure, enhancing the continuous adsorption active site regeneration after visible light irradiation for organic pollutant removal. Notably, the adsorption removal rate of tetracycline by BOB/M under light irradiation increased by 29.2% compared to dark conditions, indicating that light exposure regenerates the adsorption active sites. This improvement is mainly attributed to the introduction of MXene, which promotes the formation of reactive species, thereby accelerating the regeneration of the adsorption sites. The composite exhibits superior adsorption performance for electropositive pollutant molecules compared with neutral and negatively charged ones. Moreover, through a series of experiments and analytical characterizations, we identified superoxide radicals as the primary reactive oxygen species responsible for the degradation of tetracycline, facilitating the regeneration of adsorption sites. Furthermore, the BOB/M material exhibits excellent anti-interference capacities and stability. This study provides a novel approach for designing photocatalysts that are effective at targeting trace levels of contaminants.
研究领域:
环境科学
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材料科学
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化学工程
·
水处理
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Kai Wang,Huaqiang He,Baibing Wei,Tian C. Zhang,Haiqing Chang,Yingqi Li,Xiaobao Tian,Yubo Fan,Ying Liang,Shaojun Yuan
Surfaces with unusual under-liquid dual superlyophobicity are attractive on account of their widespread applications, but their development remains difficult due to thermodynamic contradiction. Additionally, these surfaces may suffer from limited antifouling ability, which has restricted their practical applications. Herein, we report a successful in situ growth of a hybrid zeolitic imidazolate framework-8 and zinc oxide nanorod on a porous poly(vinylidene fluoride) membrane (ZIF-8@ZnO-PPVDF) and its application as a self-cleaning switchable barrier material in rapid filtration for emulsified oily wastewater. The novel ZIF-8@ZnO-PPVDF exhibits superior mechanical strength, reversible under-liquid dual superlyophobicity, photocatalytic self-cleaning property, and an effective alternate separation capacity toward both oil-in-water (O/W) and water-in-oil (W/O) emulsions with ultrahigh fluxes and efficiencies (>99%). By simply using a “bait-hook-eliminate” method to separate the O/W emulsions containing soluble organic pollutants, we demonstrate that the ZIF-8@ZnO-PPVDF can achieve stable separation fluxes over 600 L m–2 h–1 with high efficiencies and be completely/nondestructively regenerated by visible-light irradiation after each cycle. This study would demonstrate a new approach to prepare an under-liquid dual superlyophobic revivable membrane for various applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yanan Yu,Yao Shen,Ke Wang,Jingkai Zhao,Jiexu Ye,Lidong Wang,Shihan Zhang
Amine-based technology is promising for CO 2 capture from the flue gas . However, it encounters high energy penalty and thus hampers its industrial application. Currently, the catalytic solvent regeneration is developing to lower down regeneration temperature, accelerate regeneration rate, and cut down energy consumption for monoethanolamine (MEA)-based process. However, the information on catalytic regeneration of biphasic solvent is seldom available. This work develops a facile synthesized robust catalyst, α-Fe 2 O 3, to promote the biphasic solvent regeneration such as triethylenetetramine (TETA) and 2-(diethylamino) ethanol (DEEA) blend. Experimental results revealed that, with the aid of α-Fe 2 O 3 , the efficient regeneration of TETA-DEEA occurred at 94 °C, which is far below the conventional MEA-based process (110–120 °C). The corresponding CO 2 stripping rate increased by 2.4 times compared with uncatalytic scenario. Furthermore, the relative energy consumption was furtherly decreased by 41.6%. Different from MEA regeneration, the biphasic solvent regeneration with α-Fe 2 O 3 depended on the enhancement of water molecules proton donation rather than the abundant Brønsted acid and Lewis acid of the catalyst. Based on DFT calculation and 13 C NMR spectra analysis, the water molecules on α-Fe 2 O 3 surface and the protonated DEEA were parallel served as proton donors for carbamate decomposition. Consequently, a novel proton transfer mechanism was proposed for the biphasic solvent TETA-DEEA regeneration. The water molecules adsorbed on α-Fe 2 O 3 surface generated oxyhydrogen groups and thus donate protons for the carbamate decomposition. This work proposes a novel proton transfer mechanism for solvent regeneration and advances its industrial application with a low energy penalty.
研究领域:
环境科学
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化学工程
·
催化
·
能源技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yanxin Gao,Ting Cheng,Fankang Zhao,Guocheng Huang,Jinhong Bi
The treatment of emerging contaminants is essential but challenging. Herein, a novel MOF/PAN fibrous composite (TCPP@UiO-66/PAN) was synthesized and used as a self-cleaning membrane for the efficient removal of a typical emerging contaminant, diclofenac sodium (DF). The introduction of the secondary linker tetra(4-carboxyphenyl)porphyrin (TCPP) served to expand the pores and enhance its photocatalytic activity. TCPP@UiO-66/PAN shows higher adsorption capacity and initial adsorption rate than UiO-66/PAN. The maximum adsorption capacity of DF on TCPP@UiO-66/PAN reached 202 mg/g by Langmuir model. The DF adsorption mechanism involves the π-π/anion-π interaction, Lewis acid-base interaction, and hydrogen bonding. Based on the dynamic filtration experiment, TCPP@UiO-66/PAN exhibited a remarkable treatment capacity for DF-contaminated water, measuring 3.75 × 10 4 kg/kg. Given its fibrous membrane structure, TCPP@UiO-66/PAN could be easily separated from water and reused. In-situ photo-regeneration emerged as a highly effective method for regenerating TCPP@UiO-66/PAN after reaching adsorption saturation, with over 95 % DF degradation achieved under sunlight irradiation. The decomposition of DF primarily resulted from the generation of h + and 1 O 2 . Additionally, TCPP@UiO-66/PAN exhibited notable antibacterial properties when exposed to visible light. In vitro cytotoxicity assessments further confirmed the safety of these MOF/PAN composites. Combining the advantages of hybrid-linker strategy and fibrous composite, this work provided new insight into constructing MOF-based functional material for wastewater purification.
研究领域:
环境科学
·
材料科学
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生物学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）