SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Linshan Zhang,Deshun Huang,Pengxiang Zhao,Guozong Yue,Luming Yang,Weihua Dan
As a novel two-dimensional material, MXene is considered as a good candidate for pollutants removal. In this report, Ti 3 C 2 T x MXene nanosheets suspension was synthesized by intercalating and delaminating of the multi-layered Ti 3 C 2 T x using tetramethylammonium hydroxide (TMAOH). Given to its unique properties, it showed excellent performances on cationic methylene blue (MB) adsorption. The maximum adsorption capacity was figured to be 1026 mg/g at 318 K, which is much higher than most absorbents reported in previous studies. Mechanistic studies revealed that electrostatic attraction and ion exchange are the main factors for MB removal. Additionally, the Ti 3 C 2 T x MXene nanosheets composite membrane was prepared and applied to the MB removal through filtration, which showed good removal efficiency and dye water flux. The current Ti 3 C 2 T x MXene suspension should be a promising absorbent for MB removal from water.
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JOURNAL OF NANOBIOTECHNOLOGY
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2022
·Vol. 20
·期 1
·1-15
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IF 9.429
Xu Xiao,Mao Huafen,Wu Yunchao,Liu Suwan,Liu Jingjin,Li Qianzhe,Yang Mengyu,Zhu Jinqian,Zou Shengqiang,Du Fengyi
Background Phototherapy-triggered immunogenic cell death (ICD) rarely elicits a robust antitumour immune response, partially due to low antigen exposure and inefficient antigen presentation. To address these issues, we developed novel methylene blue-loaded ovalbumin/polypyrrole nanoparticles (MB@OVA/PPY NPs) via oxidative polymerization and π–π stacking interactions.Results The as-prepared MB@OVA/PPY NPs with outstanding photothermal conversion efficiency (38%) and photodynamic properties were readily internalized into the cytoplasm and accumulated in the lysosomes and mitochondria. Upon 808 nm and 660 nm laser irradiation, the MB@OVA/PPY NPs not only ablated tumour cells by inducing local hyperthermia but also damaged residual tumour cells by generating a large amount of reactive oxygen species (ROS), finally triggering the release of many damage-associated molecular patterns (DAMPs). Moreover, the MB@OVA/PPY NPs synergized with DAMPs to promote the maturation and improve the antigen presentation ability of DCs in vitro and in vivo.Conclusion sThis work reported a PPY NPs-based nanoplatform to encapsulate the therepeutic proteins and absorb the functional molecules for combination therapy of tumours. The results demonstrated that the prepared MB@OVA/PPY NPs could be used as effective nanotherapeutic agents to eliminate solid tumours and trigger a powerful antitumour immune response.
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Catalysts
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2021
·Vol. 11
·期 11
·1349
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IF 4.146
Liaochuan Jiang,Xingyuan Gao,Shaoling Chen,Jangam Ashok,Sibudjing Kawi
At present, TiO2is one of the most widely used photocatalytic materials. However, the narrow response range to light limits the photocatalytic performance. Herein, we reported a successful construction of self-doped R-WO3/R-TiO2/CC nanocomposites on flexible carbon cloth (CC) via electrochemical reduction to increase the oxygen vacancies (Ovs), resulting in an enhanced separation efficiency of photo-induced charge carriers. The photocurrent of R-WO3/R-TiO2/CC at −1.6 V (vs. SCE) was 2.6 times higher than that of WO3/TiO2/CC, which suggested that Ovscould improve the response to sunlight. Moreover, the photocatalytic activity of R-WO3/TiO2/CC was explored using methylene blue (MB). The degradation rate of MB could reach 68%, which was 1.3 times and 3.8 times higher than that of WO3/TiO2/CC and TiO2/CC, respectively. Furthermore, the solution resistance and charge transfer resistance of R-WO3/R-TiO2/CC were obviously decreased. Therefore, the electrochemical reduction of nanomaterials enabled a promoted separation of photogenerated electron–hole pairs, leading to high photocatalytic activity.Keywords:photocatalysis;electrochemical reduction;photocatalytic degradation;TiO2;WO3
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CERAMICS INTERNATIONAL
·
2021
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IF 4.527
Deshan Cheng,Changwang Yan,Yuhang Liu,Yang Zhou,Dongdong Lu,Xiaoning Tang,Guangming Cai,Daiqi Li,Zhong Zhao,Xin Wang
Recycling of photocatalyst in wastewater treatment is a big challenge. Fixation of photocatalyst on a flexible surface of solid substrates is a promising solution. In this work, copper ferrite (CuFe 2 O 4 ) particles were loaded onto polydopamine (pDA) pretreated ceramic/polyester fabrics (CPF) via coprecipitation . The CPF not only acts as loading material for CuFe 2 O 4 particles, but also makes this photocatalyst convenient to recycle. The morphology, elemental composition and structure of the as-fabricated CPF/CuFe 2 O 4 were characterized by scanning electron microscope (SEM), Fourier transform Infrared (FT-IR) spectrometer, X-ray photoelectron spectroscopy (XPS) and X-ray diffractometer (XRD). The degradation rate of methylene blue (MB) by the CPF/CuFe 2 O 4 photocatalyst reached to 98.2% under visible light irradiation for 80 min, reflecting the excellent photocatalytic activity of the composites. The CPF/CuFe 2 O 4 demonstrated good photostability and recoverability, indicating its great potential in wastewater treatment. Moreover, the degradation mechanism and possible degradation pathway of MB by CPF/CuFe 2 O 4 photocatalyst were investigated.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Dan Li,Tao Hua,Jiren Yuan,Feigao Xu
A novel adsorbent called magnetic humic acid/graphene oxide composite (MHAGO) adsorbent was prepared for treating methylene blue (MB) from wastewater. The structure and morphology of MHAGO were characterized by FTIR, XRD , SEM and XPS . The response surface method was used to optimize the quality feeding ratio for the raw materials, and the best graphene oxide : humic acid: ferroferric oxide feeding ratio was determined to be 0.25:0.50:1.66. Batch adsorption experiments were performed with variation in the initial MB dye concentration, pH of the solution, adsorbent dosage and contact time. The results showed that the adsorption reaction occurred at 45 °C with 30 mg adsorbent to adsorb 5.0 mg/L MB in 100 mL solution, with a maximum MB adsorption capacity of approximately 59.00 mg/g for MHAGO. The adsorption kinetics and adsorption isotherms were found to be in accordance with the Elovich equation and Langmuir model, respectively. Moreover, the thermodynamic parameters showed that the adsorption is spontaneously endothermic. The mechanisms for MB adsorption onto the MHAGO surface was mainly electrostatic attraction, π-π interaction and hydrogen bonding . In addition, the MHAGO shows good feasibility for the removal of pollutants from real factory dyeing wastewater.
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CARBOHYDRATE POLYMERS
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2020
·
IF 7.182
Qun Liu,Haihuan Yu,Fanming Zeng,Xiao Li,Jing Sun,Chun Li,Hai Lin,Zhongmin Su
A novel composite HKUST-1/cellulose/chitosan aerogel (HKUST-1/CCSA) as an efficient adsorbent with hierarchical pores was prepared through a facile in situ growth way combining covalent cross-linking, vacuum freeze-drying, and solvothermal methods. By incorporating with cellulose (CE), covalently cross-linked cellulose (CE)/chitosan (CS) composite aerogel exhibits good stability, maintaining fine morphology and structures in acidic solutions under solvothermal conditions. Meantime, a high content of CS is beneficial to enhancing the growth of HKUST-1. Finally, the mass loading ratio of HKUST-1 is as high as 42.54 % in HKUST-1/CCSA. The BET specific surface area of HKUST-1/CCSA reaches 457.75 m 2 g −1 , which is much larger than that of CCSA (9.74 m 2 g −1 ). HKUST-1/CCSA was applied to remove methylene blue with high adsorption capacity (526.3 mg g −1 ) and good recycling capability. This strategy can provide an effective and facile pathway to prepare ultra-stable polysaccharide-based composite aerogel with high specific surface area and hierarchical pores, branching out more applications in pollutant treatment fields.
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ACS Omega
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2021
·
IF 3.512
Yang Shen,Wen-Xin Ni,Bing Li
A porous organic polymer (marked as DT-POP), which contains abundant free phenolic hydroxyl groups, is synthesized by the well-known green azo-coupling reaction in water, characterized, and utilized as an effective adsorbent for the elimination of methylene blue (MB) from water solutions. The presence of permanent mesopores, abundant active functional groups, and π-electron enrichment ascribed to phenyl rings make DT-POP an efficient adsorbent for MB due to strong hydrogen bonding, π–π, and electrostatic interactions with the cationic dye MB. DT-POP with high stability and high adsorption capacity can be reused many times and thus shows high applicability in pollutant disposal.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Shuyue Jia,Dongyan Tang,Yuhong Zhou,Yunchen Du,Jing Peng,Zhaojie Sun,Xu Yang
The usually inconvenient detection and uneasy recycling of polydopamine (PDA) with sphere morphology as an adsorbent restrict its actual applications in wastewater purification. Thus, novel composite fibers were fabricated via the electrospinning technique by integrating polydopamine microspheres (PDA-MPs) with pH/temperature dual-responsive copolymers. The insoluble fraction of the fabricated composite fibers can be maintained to a value above 89% after being immersed in aqueous solutions with different pH values. Also, the regeneration efficiency of the composite fibers can also remain above 80% after undergoing five adsorption–desorption cycles. These results both indicated that the fabricated composite fibers can avoid secondary pollution during the adsorption process effectively. In addition, the presence of abundant N-isopropyl acrylamide (NIPAM) units within the fibers could make it have a relatively higher water swelling ability of 4643%, which could further offer relatively larger inner spaces to accommodate the dye molecules. Meanwhile, by incorporating β-cyclodextrin (β-CD), methacrylic acid (MAA), PDA, and NIPAM components, plentiful active adsorption sites could be supplied to interact with methylene blue (MB) dye. So, the adsorption experiments of the composite fibers showed a maximum adsorption capacity of 1722.1 mg/g at pH 9.0 and a temperature of 55 °C. Furthermore, the pseudo-second-order kinetic model of adsorption suggested that it is a chemisorption process. Moreover, the adsorption experimental data can be better described by Langmuir models, inferring its monolayer adsorption. The adsorption thermodynamic studies revealed that adsorption is a spontaneous and endothermic process. Also, the increase of temperature facilitated the adsorption processes, owing to the increase of adsorbent’s hydrophobicity and molecules’ reactivity. The present work suggested that the combination of smart-responsive polymers and PDA-MPs could form an unprecedented system to be a promising candidate adsorbent for wastewater treatment.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Jia Shuyue,Tang Dongyan,Peng Jing,Yang Xu,Sun Zhaojie
The novel pH and temperature-responsive swellable electrospinning fibers, composed of p( N -Isopropyl acrylamide- co -β-cyclodextrin) (p(NIPAM- co -β-CD)) and p( N -Isopropyl acrylamide- co -Methacrylic acid) (p(NIPAM- co -MAA)), have been fabricated via electrospinning method and the followed ecofriendly thermal-treatment technology for the removal of Methylene Blue (MB). Introduced Acryloyl-β-CD and MAA offered the copolymers active groups for the crosslinking reaction within the fibers, providing improved water resistance in the pH range from 3 to 11 and higher swelling capacity reaching to 6942.2%. In the batch adsorption experiment, the adsorption capacity of the fibers for MB increased by 60% approximately as the temperature increasing from 25 °C to 55 °C, and the maximum adsorption capacity reached to 1834.97 mg/g. And the regeneration efficiency of the fibers kept above 84% after six times adsorption+desorption cycles. The adsorption process fitted well pseudo-second-order kinetic model, indicating the chemisorption process driven by the electrostatic interaction between –COOH groups of the fibers and MB molecules. And the Weber-Morris diffusion model demonstrated that the intra-particle diffusion was not the only rate-determining step during the adsorption process. Furthermore, the Langmuir model revealed that the monolayer adsorption occurred on the energy-homogenous surface. These characteristics make the stimuli-responsive fibers promising candidates as adsorbent for the purification of wastewater.
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Journal of Environmental Chemical Engineering
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2020
·
IF 4.3
Kelin Shen,Yi Cui,Dongao Zhang,Meiying Liu,Hongye Huang,Xuefeng Sha,Fengjie Deng,Naigen Zhou,Xiaoyong Zhang,Yen Wei
In this work, we reported the preparation of MoS 2 -based Fe 3 O 4 magnetic composites (MoS 2 -Fe 3 O 4 MNPs) through the biomimetic strategy, which relied on the self-polymerization of dopamine under alkaline aqueous solution. The utilization of MoS 2 -Fe 3 O 4 MNPs as catalysts for Fenton reaction to degrade organic dyes was also examined in details. A number of experimental parameters, including concentrations of H 2 O 2 , dosages of MoS 2 -Fe 3 O 4 MNPs and pH values on the degradation efficiencies were evaluated. The mechanism for catalytic degradation of methylene blue through Fenton reaction was illustrated by electron spin resonance (ESR) measurement and results indicated that the generation of ·OH and ·O 2 − is the major reason for the degradation reaction. The results from recycle experiments suggest that catalysts possess good reusability. We demonstrated that Fe 3 O 4 MNPs would be well dispersed on the surface of MoS 2 sheets relied on the linkage by polydopamine (PDA), which prevented the aggregation of Fe 3 O 4 MNPs and thus maintained high efficiency. Furthermore, we proved that the catalysts could also have high removal efficiency under low catalyst dosage and H 2 O 2 concentration. In conclusion, we believed the MoS 2 -Fe 3 O 4 MNPs could be successfully fabricated via the biomimetic strategy and should be promising candidates for environmental treatment. The biomimetic method should be also expanded for fabrication of other functional composites owing to the universal adhesion of PDA.
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Arabian Journal of Chemistry
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2020
·
IF 4.762
Ludan Zhao,Peixiao Tang,Qiaomei Sun,Shuangshuang Zhang,Zili Suo,Huaqing Yang,Xiaoxiang Liao,Hui Li
In this study, a novel carboxymethyl functionalized β-cyclodextrin-modified graphene oxide (CM-β-CD-GO) adsorbent was designed and fabricated. The CM-β-CD-GO was applied to remove methylene blue (MB) from aqueous solutions. The adsorption mechanism was discussed in detail through the study of pH effect, kinetics, and isotherm models. The adsorption of CM-β-CD-GO for MB displayed high removal rates at the pH range of 6.0–10.0, and the removal efficiency is over 90% within 20 min. The pseudo-second-order model could well describe the kinetic process of MB adsorption, and the adsorption was determined by the multi-step process. The maximum uptake capability of CM-β-CD-GO towards MB was 245.70 mg g −1 at 25 °C according to Langmuir isotherm model. A possible adsorption mechanism that electrostatic attraction, π-π interaction, and host-guest supramolecular interactions supported MB adsorption was proposed. The adsorption capacity of CM-β-CD-GO showed no significant change after five cycles. The structure and morphology of CM-β-CD-GO were characterized by XPS, FT-IR, TGA, PXRD, AFM, SEM, zeta (ζ) potential determination, and Raman spectroscopy. This work provides valuable information for the design of novel adsorbents that specifically and efficiently adsorb cationic dyes contaminants.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Yueyue Li,Yuan Wang,Lei Liu,Lecheng Tian
In this study, magnetic CoMoO 4 /CoFe 2 O 4 (CMO/CFO) nanospheres with a core-shell structure were synthesized via two-step hydrothermal methods . The obtained particles were employed as catalysts to activate peroxymonosulfate (PMS) and degrade methylene blue (MB). The physico-chemical characterizations of the synthesized CMO/CFO showed that the CMO shell contributed to the enhancement of redox conversion and the increase in the concentration of oxygen vacancies (OVs). By examining reactive oxygen species (ROS) in the CMO/CFO/PMS system, the MB degradation was dominated by a non-radical pathway, and 1 O 2 was identified as the most abundant ROS. Besides, the CMO/CFO exhibited faster reaction kinetics than the pristine CFO. Moreover, the magnetic properties guaranteed the recycling and reuse of CMO/CFO, and the removal rate of MB was maintained at ∼94% after continuous use five times. Both the tolerance to SO 4 2− and the wide pH range where the material is applicable make it a promising catalyst for dyeing wastewater treatment .
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