Catalysts
·
2022
·Vol. 12
·期 3
·297
·
IF 4.501
Dingqing Yang,Jinyang Chen,Xiaomin Hong,Jingying Cui,Lingzhen Li
TiO2/hectorite composite photocatalysts with different molar ratios of lithium, magnesium, and silicon were synthesized by a one-pot hydrothermal method. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), N2adsorption-desorption isotherms, and ultraviolet-visible diffuse reflectance spectra (UV-Vis DRS). When the molar ratio of lithium, magnesium, and silicon was 1.32:5.34:8 (TH-2), the composite showed the highest UV photocatalytic degradation of methylene blue (MB). The apparent rate constant of TH-2 was 0.04361 min−1, which was about 3.12 times that of EVONIK Degussa commercial TiO2of AEROXIDE P25. The improvement of photocatalytic efficiency of the composite was mainly due to its high specific surface area, light trapping ability, and effective separation of electrons (e−) and holes (h+). At the same time, the F element of hectorite is beneficial to the formation of Ti3+in TiO2, thus enhancing the photocatalytic activity. After five cycles, the removal rate of MB with TH-2 still reached 87.9%, indicating its excellent reusability.Keywords:photocatalysis;TiO2;hectorite;one-pot synthesis;degradation of organic dyes
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
CELLULOSE
·
2020
·Vol. 28
·期 1
·273-288
·
IF 4.21
Lu Beili,Lin Qiang,Yin Zhu,Lin Fengcai,Chen Xuerong,Huang Biao
Robust and ultralight biofoams had been successfully prepared using readily available and biocompatible cellulose nanofibrils (CNFs) as the matrix. The γ-glycidoxypropyltrimethoxysilane (GPTMS) was first added into the CNFs suspension to act as a crosslinker to form covalent linkages between cellulose chains. Then the gelatin was incorporated into the networks via reacting with the epoxy groups on GPTMS and forming hydrogen bonding with CNFs. The content of gelatin had a significant influence on the properties of the obtained foams. With the introduction of a small amount of gelatin, the foams exhibited significantly enhanced mechanical properties and stability in water in comparison with the CNF foams without GPTMS and/or gelatin. The foams containing the appropriate ratio of gelatin to CNFs possessed the high porosity (99.16%), ultralow density (0.0077 g/cm 3 ), good mechanical properties, and abundant functional groups (hydroxyl and carboxylate groups). These features made it an ideal adsorbent toward methylene blue (MB) and the maximum adsorption capacity could reach up to 430.33 mg/g. Additionally, the cationic MB could be removed from the mixed cationic/anionic dye solutions with high selectivity, possibly due to the strong electrostatic interactions between MB and the adsorbent. Furthermore, the recycling test demonstrated the good reusability of this biofoam. Therefore, this work provides an environmentally benign method to fabricate robust CNF-based foams, which can be considered as green adsorbents for the treatment of water pollutants.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Science China-Chemistry
·
2015
·Vol. 58
·期 10
·1593-1599
·
IF 1.695
He Yayun,Ding Longhua,Su Bin
Silica mesochannels (SMCs) vertically and regularly oriented to the surface of indium tin oxide (ITO) electrodes were prepared and utilized for preconcentration and detection of methylene blue (MB) in aqueous solution. The positively charged MB can be adsorbed to the SMCs by following the pseudo-first-order kinetic model. The negative value of Δ G =−34.73 kJ/mol derived from the Langmuir adsorption isotherm indicated the thermodynamic feasibility of the adsorption and the spontaneous nature of the process. Moreover, the adsorbed MB can undergo an electrochemical reaction on the ITO electrode at a suitable potential and the resulting electrical current can be utilized to quantify the MB in aqueous solution. A good analytical performance for MB with a linear range from 10 nmol/L to 1.0 μmol/L and a detection limit at the nmol/L level was obtained. We believe that such a platform consisting of SMCs perpendicularly tethered to the underlying electrode surface simultaneously allows enrichment and electrochemical detection and can be extended for the detection of various charged dyes, as well as many other charged species.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 30
·41268-41282
·
IF 4.223
Song Guobin,Li Anqi,Shi Yawei,Li Wanran,Wang Haonan,Wang Chunchao,Li Ruijuan,Ding Guanghui
In the present study, five magnetic multi-walled carbon nanotubes (MMWCNTs) with different diameters were prepared and their performance on the sorptive removal of methylene blue (MB) from water was investigated. Transmission electron microscope, scanning electron microscope, Fourier transform infrared spectrometer, X-ray diffraction, and vibrating sample magnetometer confirm that the surface of these MMWCNTs has been decorated by Fe 3 O 4 nanoparticles, which renders the MMWCNTs superparamagnetic. Thus, these MMWCNTs can be easily separated from water after the adsorption. During the adsorption process, pH slightly affected the removal efficiency of MB and the adsorption performed better under weak alkaline conditions. Adsorption kinetics followed the pseudo-second-order kinetic model well, and the Dubinin-Radushkevich model fitted the isotherms best. The maximum adsorption capacity for MB reached 204.2 mg/g, and the values decreased with increasing diameters of MMWCNTs due to decreasing specific surface areas. The thermodynamics parameters indicated the spontaneous and exothermic nature of the adsorption. The reusability test showed that MMWCNTs could be used for 6 cycles without significant loss of the adsorption capacity. And common ions (K + , Na + , Ca 2+ and Al 3+ ) and SDS in water did not show greatly effects on the removal efficiency of MB. Hence, MMWCNTs prepared in this study could be promising adsorbents for dyes removal from wastewater.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Yuling Yang,Zhenqin Lai
A new ferrocene-based porous organic polymer (named FcTz-POP) was rationally designed and synthesized. With abundant ferrocene and triazine blocks, FcTz-POP is a versatile functional material that with porous structure, high electron density and excellent stability. UV–Vis absorption spectra showed FcTz-POP exhibited a significant coverage of the solar irradiance spectrum. Photocatalytic experiments proved that FcTz-POP was highly efficient for methylene blue (MB) degradation under visible light irradiation at neutral pH. The effects of the initial MB, H 2 O 2 concentrations, pH value and ion strength on MB degradation were studied. The catalytic mechanism of FcTz-POP was also proposed. In addition, FcTz-POP possessed an outstanding and reversible adsorption ability for iodine vapor with the uptake value of 2.64 g g −1 because of the strong charge-transfer interaction between the polymer and iodine molecules. These results may provide a guidance for the design of novel POPs for photocatalytic degradation of organic dyes and harmful volatile substances capture.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Science China-Materials
·
2021
·Vol. 64
·期 9
·2325-2336
·
IF 8.273
Xu Ning,Gu Quanyong,Du Jianjun,Ge Haoying,Long Saran,Sun Wen,Fan Jiangli,Peng Xiaojun
Photodynamic therapy (PDT) is a treatment that uses light-sensitive drugs and a light source to destroy cancer cells. Methylene blue (MB) is an efficient photosensitizing agent that has been widely used in PDT. However, MB suffers from the hypochromic effect that is caused by self-aggregation and DNA binding in vivo . It is also easily reduced to ineffective leucomethylene blue in the hypoxic environments surrounding solid tumors. In this work, we prepared MB carbon dots (MB-CDs) using MB as the carbon source. The MB-CDs not only inherit the PDT capabilities of MB, but also demonstrate good biocompatibility and low toxicity. Importantly, MB-CDs demonstrate excellent resistance to interference from reduction, aggregation, and DNA interactions. The MB-CDs exhibited satisfactory PDT activities both in vitro and in vivo . The tumor sizes were reduced to below 20% of their original volumes when irradiated by a 590-nm light-emitting diode source.
研究领域:
生物医学工程
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药学
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癌症研究
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纳米技术
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DOI
高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2026
·
IF 2
Fengxia Zhang,Wen Xu,Ruihao Liu,Lei Li,Xuewu Zhu,Tianyi Jiang,Dayong Li,Yongshan Ma
The increase in population has led to an increase in the discharge of organic pollutants into the water environment. This work establishes a unified electrode testing platform to fairly compare photocatalysis (HP) and photoelectrocatalysis (PEC) over PTTE-Sb 2 S 3 heterostructure photoanode for methylene blue (MB) elimination. Unlike independent photocatalytic and PEC systems reported in most literature, all contrast experiments adopt identical catalyst loading amounts and electrode specifications, with applied bias as the only variable to reliably reveal the electric field synergistic effect. Owing to the unique advantages of PEC technology and the excellent properties of organic–inorganic heterostructures, the PEC/PTTE-Sb 2 S 3 system exhibits extremely high activity and stability in removing MB under visible light irradiation and achieves a relatively high degradation efficiency. The kinetic rate constants of the PEC/PTTE-Sb 2 S 3 system are approximately 14.6, 2.7, 2.5, and 2.1 times higher than those of the photolysis, photocatalysis (HP)/Sb 2 S 3 , HP/PTTE-Sb 2 S 3 , and PEC/Sb 2 S 3 systems, respectively. Radical quenching experiments confirm electrons (e − ), superoxide radicals (·O 2 − ), and hydroxyl radicals (·OH) are major active species. Combined with band structure analysis, we systematically differentiate the charge separation pathways of pure photocatalysis and PEC via band bending induced by external bias and propose a targeted degradation mechanism highlighting the unique electron extraction effect of the external electric field in PEC.
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Jingyu Lu,Jinchao Fang,Jiaqi Li,Chenhe Wang,Zijie He,Liping Zhu,Zhikang Xu,Hongbo Zeng
In the present work, polydopamine nanotubes (PDA NTs) decorated with silver (Ag) nanoparticles (NPs) were successfully fabricated via a template induced self-polymerization of dopamine, followed by in situ reduction and immobilization of NPs from nitrate solution. The typical Ag@PDA NTs exhibits 39.1 wt % of Ag content and excellent catalytic activity as demonstrated by the reduction of a model organic pollutant, methylene blue, with an apparent rate constant of 3.19 min–1 in the first-order kinetics model, which is the highest value reported so far. The superior catalytic performance is attributed to the high Ag loading, uniform distribution of NPs, and excellent dispersity in water. Moreover, it is believed that the superhydrophilic hollow morphology of PDA NTs with ultrahigh porosity (81.4%) and open ends facilitates the contact of the catalysts with reactant molecules and mass transfer in aqueous reaction. The Ag@PDA NTs nanocatalysts could be easily recycled, and the catalytic efficiency remained nearly unchanged over 10 cycles. This synthetic strategy was proved to be applicable to other typical metal catalysts (e.g., Pt, Pd, Au). This work presents a universal approach to fabricate highly efficient nanocatalysts with PDA NTs as supports used for the reduction and degradation of organic dyes.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
JOURNAL OF POLYMER ENGINEERING
·
2024
·
IF 1.7
Xue-Li Liu,Ya-Li Sun,Zhong-Zhu Hu,Chun-Feng Zhu
An efficient composite adsorbent was prepared based on acryloyl starch/carboxymethyl cellulose grafting copolymerization for the adsorptive removal of methylene blue. The developed composite hydrogels were characterized by means of FTIR, SEM (EDS-SEM), and XRD. Various parameters affecting the removal of methylene blue such as the type of adsorbents, pHs, the amount of adsorbents dosage, initial methylene blue concentration, and contact time were optimized using a series of batch adsorption experiments. The experimental data of the adsorption process were more fitted to Langmuir isotherm ( R 2 = 0.9898) with a maximum adsorption capacity of 483.5 mg/g and batch kinetic experiments revealed that the adsorption process followed quasi-second-order kinetic model. The adsorption process was rapid and equilibrium was reached within 30 min. When the adsorption dosage is 0.2 g L −1 , the adsorption yield for 100 mg L −1 methylene blue solution can reach 96.7 %. Therefore, acryloyl starch/carboxymethyl cellulose grafting copolymerization composite hydrogel present excellent adsorption efficiency, shows the potential application in future treatment of dyes wastewater.
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
RSC Advances
·
2014
·Vol. 4
·期 98
·55256-55262
·
IF 3.708
Zhijian Wu,Ya Xiong,Guoqiang Guan,Lingjun Kong,Shuanghong Tian
A new pyrolytic process was successfully used to prepare hollow-like spherical sludge chars (HSC). In the process, pre-formed cotton spheres with a low density were firstly coated by a layer of sludge paste containing ZnCl2 to form cotton fiber@sludge spheres and then pyrolyzed at 500 °C for 2 h. The resulting HSC possessed a diameter of about 3 mm, a low density of 0.1008 g cm−3 and a high surface area of 1008 m2 g−1. The column adsorption behavior showed that the adsorption capacity and rate constant of HSC for methylene blue reached 186.4 mg g−1 and 0.232 mL min−1 mg−1. The adsorption capacity is about 8.4 and 12 fold of the adsorption capacities of GAC (22.28 mg g−1) and SC (15.26 mg g−1), respectively, and the adsorption rate constant is about 1.3 fold of that of GAC and SC. The great adsorption capacity and rate constant can be considerably dependent on the special hollow-like spherical structure of HSC.
研究领域:
环境科学
·
材料科学
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化学工程
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污染控制
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吸附技术
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DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2014
·Vol. 29
·期 20
·2473-2482
·
IF 1.815
Yingchang Ke,Hongxu Guo,Dongfang Wang,Jianhua Chen,Wen Weng
The ZrO2 and graphitic carbon nitride (g-C3N4) composite photocatalyst has been prepared by calcination process and hydrothermal treatment. The photocatalyst was characterized by x-ray diffraction, scanning electron microscopy, x-ray photoelectron spectroscopy, UV–vis diffuse reflection spectroscopy, Brunauer–Emmett–Teller and photoluminescence spectra. The photocatalytic activity of the photocatalysts was evaluated by degradation of methylene blue under visible light irradiation. The results showed that the activity of the composite photocatalyst ZrO2/g-C3N4 for photodegradation of MB is much higher than that of either pure g-C3N4 or ZrO2, which is ascribed to the effective electron–hole separation based on the photoluminescence spectra. The •O2 − might be the main active species in MB photodegradation, and the •OH and photogenerated electrons are also partly involved in the process of photocatalytic degradation.
研究领域:
材料科学
·
环境化学
·
光催化
·
纳米材料
·
表面科学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Wenqian Cao,Dedong Wu,Pengfei Xiao
The chitosan-glutaraldehyde/activated carbon composite (CS-G/AC) was successfully prepared as an adsorbent for methylene blue (MB)-containing wastewater. Various techniques such as Brunauer–Emmett–Teller, X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy characterized CS-G/AC. The response surface methodology-Box–Behnken design, a method for experiments design and optimization, was employed to find the optimal MB removal conditions. The predicted maximum removal rate of MB was found to be 99.19% at an initial pH of 6.58, CS-G/AC dose of 3.2 g L –1 for 35 min at 42.65°C. Compared to activated carbon (AC), the removal rate of MB by CS-G/AC increased by 44.74% at 35 min. The adsorption performance and mechanisms of CS-G/AC for MB were also investigated. Adsorption of MB onto CS-G/AC followed a pseudo-first-order kinetic model, as well as Temkin and Langmuir isothermal models with a maximum MB adsorption (Q m ) of 300.75 mg g –1 . Various interactions such as electrostatic interaction, π–π bonding, and hydrogen bonding were proposed as mechanisms for MB adsorption by CS-G/AC. Furthermore, CS-G/AC has been proven to be an excellent reusable adsorbent with high adsorption capacity even after six adsorption–desorption cycles. Overall, theoretical references for the preparation of CS-G/AC, treatment of MB-containing wastewater, and mechanistic analysis were provided.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水污染治理
·
吸附技术
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）