CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2020
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IF 0.936
Hai XU,Pan ZHANG,Shao-Yan ZHOU,Qiong JIA
A magnetic molecularly imprinted polymer (MIP) was synthesized for the adsorption of methylene blue (MB). Magnetic particles were fabricated with fullerenes, which increased the surface area and provided a delocalized π-conjugate structure to enhance the hydrophobicity. A novel functional monomer with double carboxyl groups was designed based on the substituent reaction of methacryloyl chloride and iminodiacetic acid. The magnetic surface MIP was obtained with the functional compound as monomer, MB as template, and 2-vinylbenzene as crosslinker. The maximum adsorption amount was calculated to be 41.5 mg/g. The adsorption isotherm results revealed that this enrichment process followed Freundlich isotherm model and the adsorption kinetics could be well described with pseudo-second-order equation. The adsorption behavior was multilayer and mainly driven by chemical adsorption.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Yuqing Yu,Shilin Liu,Ying Pei,Xiaogang Luo
Dyeing industry highly contributes to environmental pollution and this needs to be addressed on priority. Pd NPs/CMs, a highly efficient and reusable catalyst for methylene blue (MB) decolorization , were fabricated by in-situ reduction method based on the cellulose microspheres (CMs). Pd NPs/CMs were characterized for the structure and catalytic performance by spectroscopic techniques such as SEM, EDS, XRD, IR, XPS, porosity, zeta potential , MS, and UV–visible spectroscopy, which all demonstrated that Pd NPs were distributed on the cellulose microspheres uniformly and exhibited excellent catalytic performances to decolorize a model organic dye MB in the presence of NaBH 4 with catalytic efficiency higher than 99.8%. More importantly, Pd NPs/CMs were proven to show excellent reusability for at least five cycles. Decolorization mechanism of MB, via the destruction of the chromophores (C N and S ) of MB, was established with the help of MS combined with IR and XPS. Blank experiments using pure cellulose microspheres were carried out simultaneously to estimate the level of catalytic capacity achieved to Pd NPs/CMs. These materials proved themselves having great potential in large scale applications to treat dye-containing wastewater.
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Materials
·
2020
·Vol. 13
·期 19
·4407
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IF 3.057
Zheqi Wang,Guohua Zhang,Yanhui Li
This thesis reports the preparation of chitosan/polyacrylamide/graphene oxide nanocomposites (CAGs) and a study of its adsorption properties of methylene blue (MB) solution. Initially, we synthesized CAGs by blending and freeze-drying methods. Then, we conducted a series experiments by removing MB from aqueous solution to test its adsorption properties and adsorption mechanism. We used UV-Vis spectrophotometry to determine the concentration of residual methylene blue accurately and efficiently, which has a specific absorption peak at 662 nm in the UV-Vis spectrum, in aqueous solution. When the graphene oxide content in the composite was 20 wt%, the adsorption capacity reached maximum values. The chemical properties and surface structure of the nanomaterials were analyzed using FT-IR, TGA, SEM, and BET. Also, we carried out experiments to measure the adsorption properties of the CAGs by varying several factors, such as initial concentration, adsorption time, and pH, etc. The outcomes revealed that the adsorption equilibrium was developed after 2800 min at 20 °C (room temperature) with an adsorbent dosage of 0.01 g mL−1. The ion adsorption equilibrium data were well-fitted by the Langmuir isotherm with a maximum monolayer capacity of 510.2 mg/g. Kinetic researches disclosed that the adsorption procedure was defined by a pseudo-second-order model. Thermodynamic researches revealed that the enthalpy change (ΔH0) as well as Gibbs free energy change (ΔG0) of the adsorption procedure was negative, indicating that the adsorption procedure was spontaneous and exothermic. After three cycles, the removal efficiency was still 90.18%. Therefore, in conclusion, we believe that the CAGs is a good adsorption material for organic dyes due to its good adsorption and recyclable properties.Keywords:graphene oxide;chitosan;synthetic material;adsorption;methylene blue
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Journal of Environmental Chemical Engineering
·
2021
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IF 5.909
Bo Gao,Hairong Yu,Jingya Wen,Hongju Zeng,Ting Liang,Fang Zuo,Changjing Cheng
Dye pollution has become a serious threat to environment and human health. Although versatile hydrogels have attracted intensive attentions due to their outstanding adsorption properties, the ultrahigh adsorption capacity and mechanical property are still two critical challenges for the practical applications. Herein, a super-adsorbent poly(acrylic acid)/laponite (PAAc/Lap) nanocomposite hydrogel with ultrahigh mechanical property and adsorption capacity of methylene blue (MB) is prepared by incorporating physical cross-linking with sparse chemical cross-linking. The hydrogel possesses porous 3D network structures and a fairly high water penetration with 1360 times of swelling ratio, which can allow the internal adsorption sites to be fully exposed and facilitate the adsorption. The adsorption capacity of MB can reach up to 3846 mg/g, which is almost the first time that a PAAc-based adsorbent could display superior adsorption capacity of more than 3800 mg/g towards MB. Important factors affecting the adsorption are also investigated, and the adsorption behavior is well fitted by the pseudo-second-order model and Langmuir isotherm model. More importantly, the appropriate physical cross-linking and sparse chemical cross-linking in the polymeric network endows hydrogel with superior mechanical properties. The tensile stress and strain are as high as 1.18 MPa and 2192%, which can facilitate the expansive applications and practical treatment. Mechanism analyses illustrate that the electrostatic interactions and cation-exchange between the functional groups of hydrogel and MB molecules contribute to the extraordinary adsorption ability. The proposed PAAc/Lap hydrogel with ultrahigh adsorption capacity and mechanical property is highly promising as an efficient super adsorbent for water treatment .
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RSC Advances
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2019
·Vol. 9
·期 70
·41209-41217
·
IF 3.049
Xiaoxuan Di,Feng Guo,Zihan Zhu,Zhonghao Xu,Ziqi Qian,Qian Zhang
A novel ZnO–GO/CGH composite was prepared using an in situ synthesis process for photodegradation of methylene blue under visible light illumination. The chitin–graphene composite hydrogel (CGH) was used to provide uniform binding of the nano ZnO–GO composite to the hydrogel surface and prevent their agglomeration. GO provides multi-dimensional protons and electron transport channels for ZnO with a flower-like structure, which possessed improved photo-catalytic activity. SEM analysis indicates that the hydrogel has good adsorption properties with rougher surfaces and porous microstructure, which enables it to adsorb the dyes effectively. Under synergetic enhancement of adsorption and photo-catalysis, catalytic activity and nano ZnO–GO/CGH recycling improved greatly. Synthesized nano ZnO–GO/CGH showed high dye removal efficiency of 99%, about 2.2 times that of the pure chitin gel under the same condition. This suggests the potential application of the new photocatalytic composites to remove organic dyes from wastewater.
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DIAMOND AND RELATED MATERIALS
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2019
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IF 2.29
Jiaqi Bu,Lu Yuan,Na Zhang,Dong Liu,Yong Meng,Xin Peng
With the aim of developing an improved adsorbent material for the treatment of printing and dyeing wastewater, we prepared a novel thiosemicarbazide functionalized graphene oxide (GO-TSC-GO) adsorbent by condensation reaction of the thiosemicarbazide amino group with the graphene oxide carboxyl group. This material was characterized by SEM, XPS , FTIR , Raman, XRD , UV–Vis, TGA , and BET then used to conduct adsorption experiments on simulated printing and dyeing wastewater containing methylene blue (MB). We investigated the effects of temperature, time, pH, salt ionic strength , initial MB solution solubility, and the activation and regeneration of the adsorbent on adsorption performance. The adsorption behavior was consistent with the pseudo-second-order adsorption kinetic model and the Langmuir adsorption isotherm model. Thermodynamic analysis indicated an exothermic chemical adsorption reaction. In addition, the GO-TSC-GO exhibited excellent reusability . The maximum adsorption capacity of GO was 196.8 mg/g whereas the maximum adsorption capacity of GO-TSC-GO was 596.642 mg/g, verifying that the GO-TSC-GO composite has important applications for the treatment of printing and dyeing wastewater.
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CHEMICAL PHYSICS
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2019
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IF 1.822
Xue Song,Pan Yang,Dongxue Wu,Pengxiang Zhao,Xiaochong Zhao,Lijun Yang,Yuanlin Zhou
Metal-organic frameworks have remarkable advantages of high specific surface area, tunable pore structure, species diversity and superior stability causing it be a good adsorbent for methylene blue removal. Here, UiO-66 was prepared by two-step simple method at room temperature, then the effects of water on morphology, crystallinity and adsorption properties of UiO-66 were studied. UiO-66 exhibits good adsorption performance of MB with maximum adsorption amount of 543.48 mg g −1 and good cycling stability.
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Oxidative Medicine and Cellular Longevity
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2019
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IF 4.868
Chunlan Jiang,Wenyi Yang,Chengyi Wang,Wei Qin,Jiajun Ming,Manman Zhang,Haixin Qian,Ting Jiao
Aim. To investigate whether methylene blue-mediated photodynamic therapy (MB-PDT) can affect the “fate” of macrophages in vitro or in periodontitis tissues and to explore the potential mechanism. Methods. For in vitro treatments, THP-1 macrophages were divided into three experimental groups: C/control, no treatment; MB, methylene blue treatment; and MB-PDT, MB and laser irradiation treatment. Then, apoptosis and apoptosis-related proteins were detected in each group. For in vivo treatments, periodontitis was ligature-induced in the first molars of the bilateral maxilla in 12 Sprague Dawley (SD) rats. After six weeks, the ligatures were removed and all the induced molars underwent scaling and root planning (SRP). Then, the rats were divided into three groups according to the following treatments: SRP, saline solution; MB, phenothiazinium dye; and MB-PDT, MB and laser irradiation. Apoptotic macrophages, inflammation levels, and alveolar bone resorption in the periodontal tissues of rats were analyzed in each group. Results. In vitro, flow cytometry analysis demonstrated that 10 μM MB and 40 J/cm2 laser irradiation maximized the apoptosis rate (34.74%) in macrophages. Fluorescence probe and Western blot analyses showed that MB-PDT induced macrophage apoptosis via reactive oxygen species (ROS) and the mitochondrial-dependent apoptotic pathway. Conversely, the addition of exogenous antioxidant glutathione (GSH) and the pan-caspase inhibitor Z-VAD-FMK markedly reduced the apoptotic response in macrophages. In vivo, immunohistochemistry, histology, radiographic, and molecular biology experiments revealed fewer infiltrated macrophages, less bone loss, and lower IL-1β and TNF-α levels in the MB-PDT group than in the SRP and MB groups (). Immunohistochemistry analysis also detected apoptotic macrophages in the MB-PDT group. Conclusion. MB-PDT could induce macrophage apoptosis in vitro and in rats with periodontitis. This may be another way for MB-PDT to relieve periodontitis in addition to its antimicrobial effect. Meanwhile, MB-PDT induced apoptosis in THP-1 macrophages via the mitochondrial caspase pathway.
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RSC Advances
·
2019
·Vol. 9
·期 31
·17664-17673
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IF 3.049
Kai Wang,Yi Yang,Tian C. Zhang,Ying Liang,Qingguo Wang
Magnetic Co-doped Fe3O4@FeOOH nanocomposites were prepared in one step using the hydrothermal synthesis process for catalyzing peroxymonosulfate (PMS) to degrade refractory methylene blue (MB) at a wide pH range (3.0–10.0). The catalysts' physiochemical properties were characterized by different equipment; Fe3+/Fe2+ and Co3+/Co2+ were confirmed to coexist in the nanocomposite by X-ray photoelectron spectroscopy. The nanocomposite effectively catalyzed PMS's decoloration (99.2%) and mineralization (64.7%) of MB. The formation of Co/Fe–OH complexes at the surface of nanoparticles was proposed to facilitate heterogeneous PMS activation. Compared with the observation for Fe3O4@FeOOH, the pseudo-first-order reaction constant was enhanced by 36 times due to Co substitution (0.1620 min−1 vs. 0.0045 min−1), which was assigned to the redox recycle of Fe3+/Fe2+ and Co3+/Co2+ in Co-doped Fe3O4@FeOOH. Besides, the catalyst could be easily reused by magnetic separation and exhibited relatively long-term stability.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
·
IF 2.298
Yun Li,Shu-jie Liu,Fu-ming Chen,Jian-e Zuo
This study proposed a new gelation method to prepare apatite/attapulgite/alginate composite hydrogels with high structural stability for effective adsorption of methylene blue (MB) from aqueous solution. Three types of conventional gels, together with the newly proposed apatite/attapulgite/alginate composite hydrogels, were compared for their mechanical strengths and adsorption behaviors and investigated for effects of the gelation process on their adsorption capacities. The isotherms, kinetics, and thermodynamics of the adsorption of MB onto the four types of gels were studied at different initial MB concentrations, temperatures, and contact times. The swelling test results proved that the apatite and attapulgite particles reinforced the structure of hydrogels to maintain its integrity in a saline solution. The adsorption kinetics results showed that all the adsorption followed the Langmuir model and the pseudo-second-order model. Calculations of thermodynamic parameters proved the adsorption processes to be spontaneous. The new prepared attapulgite/apatite/alginate composite gels were demonstrated to have the highest adsorption capacity among the four types of hydrogels. A possible reason could be that the porosity and functional groups of attapulgite and apatite provide enough active sites to improve the affinity of dye molecules to the surface of hydrogels.
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ENVIRONMENTAL POLLUTION
·
2019
·
IF 5.714
Jinli Qiu,Pei Fan,Yuefeng Feng,Fuqiang Liu,Chen Ling,Aimin Li
High removal efficiency and excellent recyclability are the fundamental qualities that an outstanding adsorbent used for organic dye removal should possess. In this study, two recyclable gels (sodium alginate/Ca/fiber: SCFA hydrogels; cellulose nanofiber/chitosan: CNFCS aerogels) were successfully fabricated using the facile method. Additionally, the as-prepared adsorbents were investigated using a series of characterizations. The adsorption behavior and anti-interference performance of the synthesized gels were compared by choosing methylene blue (MB) as the model pollutant. The kinetic behavior of the gels towards MB was consistent with the pseudo first-order model, and the SCFA hydrogels reached adsorption equilibrium faster than the CNFCS aerogels . The maximum adsorption capacity of MB on the SCFA hydrogels and CNFCS aerogels was 1335.0 and 164.5 mg g −1 (pH = 7.0, dosage: 0.5 g/L; initial concentration from 15 to 180 mg L −1 ), respectively. More specifically, we found that the co-existing anions had different effects on MB adsorption over the gels used for MB removal. Furthermore, for the SCFA hydrogels, co-existing natural organic matter (NOM) at low concentrations enhanced MB adsorption, and then stabilized as the concentration of NOM increased. However, this increasing trend was not observed for MB adsorption on CNFCS aerogels; these gels exhibited a slight decrease at first, and then showed no change. Nevertheless, both the gels exhibited superior regeneration and recycling abilities.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
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IF 2.829
Hong-Liu Jiang,Jie-Ci Lin,Wei Hai,Hong-Wei Tan,Yu-Wei Luo,Xiao-Lin Xie,Yao Cao,Fu-An He
In this work, a novel crosslinked porous β-cyclodextrin-based polymer containing carboxylic acid groups (CT-β-CD) was synthesized successfully and characterized by SEM , FTIR, 13 C solid-state NMR, water-contact-angle measurement, and TGA . The resultant CT-β-CD with triple absorption effects including inclusion complextion, porous network capture, and electrostatic interaction was employed as an adsorbent for removing methylene blue dye from aqueous solution, which exhibited several advantages such as high absorption capacity (q max = 672 mg/g), rapid absorption rate, good recyclable ability, and selective adsorption for cationic dyes. The influences of initial MB concentration, absorption time, and pH value on the absorption behavior of CT-β-CD for MB were also investigated. In addition, it was found that the pseudo-second-order kinetic and the Langmuir model for adsorption isotherm could be used to describe the MB absorption behavior of CT-β-CD.
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