POLYHEDRON
·
2023
·
IF 2.6
Geng Zhang,Yuanyuan Wang,Xueqin Wang,Bolong Jiang,Yanxiu Liu,Hua Song
Zeolitic imidazolate frameworks (ZIFs) have been widely applied in many research fields, such as catalysts and adsorption. To meet the needs of scale applications, the development of simple, rapid and high-yield synthesis is a great necessity. In this work, a novel and facile strategy for the rapid synthesis of micro-mesoporous ZIF-8-H at room temperature within a very short time of 16 min using inexpensive quaternary ammonium base (tetramethylammonium hydroxide pentahydrate, TMAH) as a template was proposed. Results showed that in addition to significantly shortening crystallization time, the TMAH template also induced abundant mesopores for ZIF-8-H, which can improve the adsorption rate and fully use the adsorption active sites. More importantly, the ZIF-8-H yield of the proposed strategy is 3.6 times more than that of the conventional method, which is conducive to the realization of large-scale production. Among ZIF-8-H- x - t , ZIF-8-H-0.8-16 prepared with TMAH/Zn 2+ molar ratio x of 0.8 and reaction time t of 16 min exhibited the highest MB removal effectiveness of 96.3 ± 0.8%, a remarkable increase of 127% compared to ZIF-8-M prepared by conventional method (42.5 ± 0.9%). Additionally, the MB adsorption onto ZIF-8-M and ZIF-8-H-0.8-16 fitted well with the pseudo-first-order kinetics model and Langmuir isothermal model, suggesting the monolayer adsorption behavior is dominant. The ZIF-8-H-0.8-16 showed a maximum adsorption capacity of 47.90 mg/g, which is higher than that of ZIF-8-M.
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高影响因子
POLYMER
·
2022
·
IF 4.432
Tianjing Zhang,Siyu Xiao,Kehao Fan,Hua He,Zhiyong Qin
Four green aerogels were prepared to remove the cationic dye methylene blue (MB), using the method of solution mixing and freeze-drying. Polyethylene glycol diglycidyl ether (PEGDE) was employed as a crosslinker. The structure and performance of the adsorbents were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), zeta potential measurement and mechanic testing. The results identified that PEGDE efficiently assisted in forming network structure of the porous aerogels, and the removal rates of four aerogels were all higher than 90%. The aerogel composed of sodium carboxymethyl cellulose (CMC) and carboxylated cellulose nanofibers (CNF–C) performed best with adsorbance of 579.50 mg/g, which had a strong electrostatic attraction with MB, exhibited selective adsorption, and did not collapse after ten cycles of underwater compression tests. The adsorption process of CMC/CNF–C aerogel was compatible with the pseudo-second-order kinetic model and Langmuir isothermal model, and the maximal adsorption capacity was 917.43 mg/g. According to the calculation of thermodynamic parameters, the adsorption process was spontaneous and benefited from temperature rise in 20–40 °C. After five regenerations, the adsorption capacity of CMC/CNF–C aerogel decreased from 579.5 mg/g to 513.2 mg/g, indicating a reusable adsorbent in wastewater treatment.
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ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Hua Lin,Kaiwei Chen,Linlin Du,Peng Gao,Junli Zheng,Yuanli Liu,Lili Ma
As an important biomass resource, agricultural waste is of great significance to improve the application value. In this study, the yellow passion fruit peel (Y-PFP) was used as a biosorbent to remove cationic dyes (methylene blue (MB) and methyl violet (MV)) by the simple treatment process. And the effects of pH, contact time, initial dye concentration, ionic strength, and temperature on the adsorption performance of Y-PFP were studied. The adsorption process was consistent with the pseudo-second-order kinetic model and Langmuir isotherm. What’s more, the maximum adsorption capacity for MB and MV was 324.7 and 485.4 mg·g−1, respectively. And Y-PFP still exhibited high removal efficiency after five desorption–adsorption cycles. Thus, Y-PFP had highly valuable for the removal of cationic dyes from wastewater with a simple preparation process, low cost, excellent adsorption capacity and selectivity.
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PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2022
·
IF 4.383
Yujie Zhang,Qin Yang,Jie Liang,Yongsong Luo,Qian Liu,Yingchun Yang,Xuping Sun
Sulfate radical-based advanced oxidation processes (SR-AOPs) have emerged as an attractive technology in organic dye wastewater treatment. In this study, hydrothermally synthesized Fe-glycerate microspheres is successfully applied as a heterogeneous catalyst to degrade methylene blue (MB) via activating peroxymonosulfate (PMS). The experimental results suggest that MB degradation efficiency and total organic carbon (TOC) removal can arrive at 99.7% and 37.1% in 60 min by the Fe-glycerate/PMS system, indicating that Fe-glycerate microspheres has an excellent catalytic degradation performance. In addition, the effects of PMS concentration, catalyst dosage, initial pH and coexisting ions on MB degradation efficiency were studied. Radical quenching and electron paramagnetic resonance (EPR) tests confirm that the major active species are sulfate radical (SO 4 ·– ) and singlet oxygen ( 1 O 2 ) for MB degradation, followed by superoxide radical (O 2 ·– ) and hydroxyl radical (·OH). Furthermore, the possible mechanism of MB degradation by Fe-glycerate/PMS system was inferred. This work shows Fe-glycerate microspheres can be considered as a new and promising pathway to activate PMS for treating organic dye wastewater.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Xiangmei Xiang,Juanjuan Zhou,Shaochen Lin,Nan Zhang,Gulizhabaier Abulipizi,Guikui Chen,Zhanjun Li
Microplastics (MPs) can adsorb and influence the toxicity of traditional pollutants significantly. Although the complex toxicity of MPs and molecular pollutants were frequently reported, rare work has been done on the influence of MPs on the phototoxicity of photosensitive pollutants under light illumination condition. Herein, polystyrene microplastics (PS) (~1 μm in diameter, 5.0 mg/L) was used as a model MP to investigate its influence on the phototoxicity of a soluble blue dye, methylene blue (MB) using Daphnia magna as a model organism. The results indicate that PS could adsorb MB effectively and quickly, thus led to concentrated MB on PS/water interface. D. magna ingested MB-adsorbed PS very quickly within tens of minutes. Although MB or PS alone led to negligible lethal phototoxicity to D. magna , PS significantly enhanced the lethal phototoxicity of MB (0.25 mg/L) to D. magna after light illumination (10 h) with the survival rate decreased by 63.3 % compared with the control in the dark. Further, the phototoxicity of MB was found positively consistent with PS concentration from 0.50 mg/L to 7.50 mg/L. The singlet oxygen fluorescence assay indicates that the presence of PS did not increase the total amount of singlet oxygen in the aquatic environment but increased the local concentration in the gut area via non-selective ingestion of D. magna . High level singlet oxygen generated in the gut might possibly be the main reason that led to the massive death of D. magna . Surface adsorption of photosensitive pollutants may transform inert MPs into persistent solid sources of singlet oxygen production and become a new potential lethal threat to aquatic small organisms and ecological equilibrium. This kind of MPs and light dual drive phototoxicity of photosensitive pollutants needs to paid more attention in understanding the uncertain ecological risk of MPs.
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Qiang Wang,Haibo Liu,Peixun Zhai,Fuwei Sun,Tianhu Chen,Ziyang Chu,Dong Chen,Xuehua Zou
In this study, a new low-cost carbon-based material was prepared via the carbonization of methylene blue adsorbed halloysite (CMH) at different temperatures in a nitrogen atmosphere, which was named CMH-T (T-Temperature). The performance of CMH-T was explored and the effects of initial pH values, catalyst dosage, phenol (PE) concentrations, peroxymonosulfate (PMS) concentrations, and water background compounds on PE degradation were investigated systematically. The results indicated that CMH800 exhibited the best performance to activate PMS for degrading PE. Specifically, 92% PE was degraded within 30 min with a constant rate ( k obs ) of 0.1186 min −1 in the CMH800/PMS system. Furthermore, CMH800 was efficient over a wide pH range (pH 3–9) and showed a slight inhibition to inorganic anions. Quenching experiments, electron spin resonance (ESR) analysis, and electrochemical analysis confirmed that PE was degraded through non-radical pathways dominated by single oxygen ( 1 O 2 ) and mediated electron transfer processes in the CMH800/PMS system. In addition, the predicted toxicity of intermediates through ECOSAR software based on QSAR (Quantitative Structure - Activity Relationship) model indicated that most of the intermediates had a low risk to water environment. Therefore, the CMH800 has a good potential for wastewater treatment applications.
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高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 30
·期 10
·4287-4303
·
IF 4.705
Shi Liang,Liu Wenwu,Zhang Xiaomei,Hu Jingsong
In this study, an environmentally friendly lignin-based hybrid hydrogel (LS/OMMT) was prepared by grafting of acrylamide (AM) and acrylic acid (AA) onto calcium lignosulfonate (LS) and homogeneously distributing organic montmorillonite (OMMT) using an ultrasonic technique. FT-IR, XRD, TGA, SEM, EDS, BET, and XPS were used to characterize the physicochemical and structural properties of LS/OMMT. Then, LS/OMMT was applied to remove methylene blue (MB) from an aqueous solution and a systematic study of pH, contact time and initial MB concentration was carried out. The MB adsorption capacity on LS/OMMT was up to 492.7 mg g −1 at 313.15 K and pH 7.0. The Langmuir model well described the MB adsorption on LS/OMMT and the calculated thermodynamic parameters, such as ΔG°, ΔH°, and ΔS°, suggested that MB adsorption on LS/OMMT was spontaneous and endothermic. LS/OMMT adsorption of MB followed a pseudo-second-order kinetic model. Electrostatic attraction and hydrogen-bonding interaction were the mechanisms of adsorption. As a result, this study illustrates that LS/OMMT is an environmentally friendly and efficient adsorbent for wastewater treatment applications.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2022
·
IF 5.999
Mengmeng Xie,Xiuying Liu,Shige Wang
In this study, a low-cost and high-performance MoS 2 /sodium alginate (SA)/Fe (MSF) hydrogel catalyst was prepared. It was found that the MSF hydrogel could efficiently catalyze the degradation of methylene blue (MB) through the Fenton reaction without the addition of Fe 2+ . The reaction was initiated by Fe 2+ which was derived from the cyclic redox reaction between MoS 2 and Fe 3+ and produced large quantities of ·OH to degrade the MB. The effect of MoS 2 concentration, FeCl 3 ·6H 2 O concentration, H 2 O 2 dosage, solution pH, and light on the degradation was systematically studied. The MoS 2 concentration of 0.5 mg/ mL, FeCl 3 ·6H 2 O concentration of 0.25 g/mL, 50 μL H 2 O 2 , and the pH of 4.0 were the optimized parameters. Moreover, it was found that the MB degraded faster under the infrared radiation. The MB removal rate reached as high as 98% within 15 min in the presence of a low concentration of H 2 O 2 and the procedure could be repeated 5 times. The MSF hydrogel provided an effective and simple strategy for the sustainable degradation of organic pollutants in wastewater.
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PubMed
高影响因子
Colloid and Interface Science Communications
·
2021
·
IF 4.914
Haize Jin,Youyou Zhang,Qikun Wang,Qibing Chang,Cuixia Li
Ongoing researches about adsorption removal of heavy metal ions and dyes are targeted to improve adsorption efficiency and recycle to solve environmental problems. Geopolymer as an adsorbent for wastewater treatment exhibits a good application potential. Here, a rapid removal strategy for methylene blue (MB) and nickel ions based on metakaolin-based geopolymer (MG) is provided. The adjustment of pH allows the MG to expose more negative charge adsorption sites, resulting in rapid removal of MB and Ni 2+ . The adsorption data fitted well by the pseudo-second-order model and Langmuir model, indicating the chemisorption of MG for MB and Ni 2+ . The decrease of pH of wash solution is conducive to the desorption of Ni 2+ . However, the desorption of MB-loading MG proved to be very difficult. This study provides a universal reference and possibility for rapid removal of cationic dyes and heavy metal ions under relatively mild conditions.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Yang He,Ming Wen,Bingke Xu,Quanwu Tang,Jingwen Xiao,Bing He,Jiajun Xu,Wenzhu Shen,Shaohua Gou
Herein, the structural evolution of organo-montmorillonite (organo-Mt) after the intercalation of zwitterionic surfactants with different alkyl chains was investigated and linked the adsorption behavior of cationic dye (methylene blue, MB). The zeta potential of Mt before and after intercalation showed very small change. While the modification had a significant effect on hydrophilicity of Mt owing to introducing the alkyl chains. The interlayer spacing of Mt was determined by X-ray diffraction, which was used to analyze the arrangement patterns of zwitterionic surfactants in the interlayer according to the molecules size. The relationship between the structural characteristic of organo-Mt and adsorption changes indicated that the paraffin-type arrangement of zwitterionic surfactants and overlong alkyl chain were unfavorable to adsorption. The introduction of appropriate hydrophobic structure endowed high dye adsorption capacity, evidencing the importance of structure regulation of Mt in adsorption. The adsorption of MB by organo-Mt was a spontaneous exothermic process, in which MB molecules were covered on organo-Mt in a monolayer. Compared with Na-Mt, the adsorption capacity of 0.6CEC BS-10/Mt (lateral monolayer arrangement of BS-10 in the interlayer of Mt) could be increased by about 20%. Overall, this work provided valuable guidance for the modification (more types of modifiers) and utilization (adsorbents, nanomaterials, etc.) of Mt in different fields.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 27
·50655
·
IF 3.125
Aafia Tehrim,Min Dai,Xiange Wu,Malik Muhammad Umair,Imran Ali,Muhammad Ahsan Amjed,Rong Rong,Sheikh Fahad Javaid,Changsheng Peng
Waste cigarette filters (CFs) were recycled and modified with a nontoxic and low-cost citric acid (CA). The modified CFs were employed in the adsorptive removal of methylene blue (MB) dye from aqueous medium. The influence of pH, contact time, initial dye concentration, and adsorbent dose on adsorption of MB dye was evaluated. The adsorption studies were conducted by employing linear and nonlinear Langmuir and Freundlich isotherm models. The adsorption capacity of CF obtained through linear and nonlinear Langmuir model were 88.02 and 94 mg g −1 , which improved up to 163.93 and 168.81 mg g −1 , respectively, after the introduction of functional groups in CF-CA. The adsorption kinetics data were well fitted by pseudo-second order kinetics with coefficient of regression (R 2 ) closed to unity. The removal efficiency of CF-CA was 97% at equilibrium time of 4 h. Desorption studies indicated that CF-CA could be regenerated by using HCl (0.1 M) and desorption efficiency was up to 82% upon second cycle of reusability experiment. This study proposed a green and economical use of recycled CFs in dyes wastewater treatment, simultaneously reducing the negative environmental impact due to their improper disposal.
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高影响因子
Polymer-Plastics Technology and Materials
·
2021
·
IF 2.371
Yan Zhang,Zaifeng Shi,Tianyi Sun,Dashuai Zhang,Xiaopeng Zhang,Xiaoxue Lin,Chen Li,Lili Wang,Junjun Song,Qiang Lin
A novel photodegradable Methylene Blue (MB)/TiO2/PVC film was prepared. The physical and mechanical properties, hydrophilicity, and the thermal stability of the film before irradiation were characterized. The photodegradability test was performed by using gel permeation chromatography (GPC), infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), and scanning electron microscopy (SEM). Compared with TiO2/PVC, MB/PVC, and PVC, the MB/TiO2/PVC film showed the higher photodegradability. The weight loss rates of TiO2/PVC, MB/PVC, and MB/TiO2/PVC films after irradiation for 30 h were 8.94%, 15.84%, and 27.55%, respectively, while that of PVC was only 2.12%. The decline rates of Mw and Mn of MB/TiO2/PVC (MB 2 wt%, TiO2 1 wt%) were 35.68% and 65.38%, respectively. Due to the excellent degradability and usability of the MB/TiO2/PVC film, the photocatalytic technology is a feasible and effective way to solve “white pollution”.
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