SEPARATION AND PURIFICATION TECHNOLOGY
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2017
·
IF 3.359
Ying Zhao,Yu Chen,Jian Zhao,Zongrui Tong,Shaohua Jin
A pH-responsive polyampholytic superabsorbent polymer (SAP), sodium alginate-g-(polyacrylic acid-co-polymethacryloxyethyltrimethyl ammonium chloride) (SA-g-(PAA-co-PDMC)), was prepared by the free-radical-induced graft copolymerization . The structure of the SAP was characterized by FTIR, XRD and SEM. The synthesis conditions were optimized to achieve an SAP with the highest swelling ratio. The anionic dye adsorption properties of the achieved SAP were characterized using Food Yellow 3 (FY3) as a model dye. The effects of DMC amount and pH of the dye solution on the adsorption capacities were determined. The adsorption kinetics, isotherm, thermodynamics, desorption and reusability of the SAP were studied respectively. The maximum adsorption capacity and removal efficiency of SA-g-(PAA-co-PDMC) SAP reached up to 654.87 mg/g and 98.23%, respectively, which are among the highest values of solid adsorbents in FY3 adsorption. Compared with the traditional polyanion SAPs, the SAP prepared in the present work can be expended to the simultaneous removal of both cationic and anionic dyes.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2017
·
IF 3.151
Chaoyue Hao,Jianping Gao,Yongli Wu,Xiaoxue Wang,Ruiru Zhao,Shunkang Mei,Jiangbing Yang,Xiangang Zhai,Haixia Qiu
Folic acid (FA) supramolecular gel was prepared in a mixture solvent of N -methylpyrrolidone (NMP)/H 2 O at a 1/1 volume ratio by using FA as gelator with a concentration of 0.4% (w/v). In the mixture solvent, NMP was first of time used as a good solvent to tune the solvent properties in order to be able to induce formation of FA supramolecular gel. The folic acid-gelatin (FA-GA) hybrid gels were synthesized by adding different amount of gelatin (GA) into FA gelator. The gelation temperature (T Gel ) of the FA-GA hybrid gel is 30 °C which is much higher than that of FA gel (10 °C). The gel to sol transition temperature (T GS ) is about 58 °C, which demonstrates that the hybrid gel has good stability at room temperature . The FT-IR and UV–vis spectra of FA-GA hybrid gel indicate that GA involves in the self-assembly process of FA via hydrogen bonding and π-π interactions with FA molecules. Owing to the π-π interaction happened between FA and GA molecules the fluorescence intensity of FA-GA gel is four times as high as that of FA gel. SEM images shows that the hybrid gel has a helical-fiber network structure which would enhance the gel strength to a great extent. Good stability, large specific surface and porosity in three-dimensional network structure of the FA-GA hybrid gel make it a highly promising adsorbent for dye adsorption. The FA-GA hybrid gel is able to absorb 63.5% of Congo red (CR), 68% of methyl blue (MB) and 44% of methyl orange (MO) respectively from their solutions.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 16
·5763
·
IF 3.748
Minmin Zou,Hexin Zhu,Ming Dong,Tian Zhao
As one of the most important prototypical chromium-based MOFs, MIL-101(Cr) is well-studied and widely employed in various scientific fields. However, due to its small capture window sizes and curved internal apertures, its application in large molecular removal is quite limited, and given its high stability and high synthetic temperature (>200 °C), it is difficult to achieve hierarchically porous MIL-101(Cr). In our study, hierarchically porous MIL-101(Cr) involving a high macro-/meso-/micropores ratio was designed and synthesized using acetic acid as an additive and silicon dioxide (SiO2) nanoparticles as a template. The optimal hierarchically porous MIL-101(Cr) (A-4) possessed a high specific surface area (2693 m2g−1) and an abundant macro-/mesoporous structure with the addition of SiO2of 200 mg. Compared with the control sample (A-0) with a less macro-/mesoporous structure, A-4 showed good adsorption properties for both coomassie brilliant blue R-250 (CBB, 82.1 mg g−1) and methylene blue (MB, 34.3 mg g−1) dyes, which were 1.36 times and 9.37 times higher than those of A-0. Moreover, A-4 also had good recyclability, and the removal rate of CBB was still higher than 85% after five cycles of adsorption.Keywords:MIL-101(Cr);SiO2;dye adsorption;template
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
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2025
·
IF 2.4
Ke Yang,Sisi Cheng,Shijia Li,Kun Zhu,Ziqin Yao
The influencing factors of ZIF-8 synthesis were systematically investigated by the green synthesis method and the samples were also compared with ZIF-8 synthesized in other ways, and an optimal synthesis route was found by exploring the synthesis conditions. On this basis, the synthesis mechanism of ZIF-8 was analyzed. The research results show that the key influencing factors in the reaction process are the amount of NaOH and the pH value of the system. Different amounts of NaOH will produce different intermediates, and these intermediates further affect the pH value of the entire reaction system. The pH value of the system plays a decisive role in the deprotonation process of the ligand in the reaction, and this process is the key to whether the ZIF-8 structure can be formed. It is worth mentioning that the ZIF - 8 synthesized in this study demonstrates varying removal performances for different dyes under different conditions. Under specific conditions, it exhibits the maximum removal rate for Rhodamine B (RhB), reaching 99.97 %. This excellent removal performance is closely associated with the pore - structure characteristics of the synthesized material, which fully indicates that the ZIF - 8 synthesized through the green route has certain application potential and promising application prospects in related fields.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Yang Wang,Sidi Wang,Zhen Li,Liwei Sun,Xiaoyu Yang,Shaokun Tang
UiO-66 nanocrystals were synthesized by supercritical reaction crystallization with anhydrous zirconium chloride as the metal precursor, terephthalic acid as the ligand, and a small amount of N,N-dimethylformamide (DMF) and formic acid as cosolvents in supercritical CO2. In our work, the product UiO-66 obtained exhibits typical octahedral morphology with a specific surface area of 1092 m2/g and concentrated micropore diameters of 0.77, 1.05, and 1.73 nm. The thermal decomposition temperature of the product is 450 °C. It was found that the adsorption selectivity of UiO-66 for Congo red is much higher than those for methylene blue and methyl orange, which can reach up to over 1300 mg/g. The adsorption process conforms to the second-order adsorption kinetics curve, and the adsorption isotherm fits into the Langmuir model. Meanwhile, the adsorbent UiO-66 possesses good cycle stability and its adsorption performance remains excellent after seven cycles.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
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2020
·Vol. 231
·期 10
·1-18
·
IF 1.9
Liu Huan,Xu Chao,Wei Xueling,Ren Yiming,Tang Dingxing,Zhang Cuige,Zhang Rongli,Li Fang,Huo Chaofei
In this study, activated carbons were prepared from bamboo via carbonization and successive KOH activation by tuning the post-treatment procedure. The resultant carbons possessed high surface area, high oxygen doping, and 3D hierarchical porous structure with interconnected micro-, meso- and macropores. These features resulted in ultra-excellent adsorption capacity for rhodamine B (> 1200 mg/g). Furthermore, the kinetic and isotherm experimental data were best described by pseudo-second kinetic model and Langmuir isotherm model, respectively. The adsorption of RhB onto the as-synthesized carbons was a spontaneous endothermic process. The π–π stacking, hydrogen bond, and acid-base interaction were proposed to account for the adsorption mechanism. Moreover, SiO 2 in bamboo-based carbon functioned as frameworks and its removal via alkali treatment led to the collapse of porous structure, decreasing surface area, pore volume, and O heteroatom doping, consequently dropping the adsorption performance. Overall, bamboo as an abundant and renewable biomass could be considered as a potential precursor for the production of excellent adsorbent for wastewater purification.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 48
·36063-36072
·
IF 3.9
Xuebin Hou,Wei Chen,Meihong Fan,Chen Shi
Chitosan (CS) is regarded as a promising sorbent due to its biodegradability, wide availability, easy processing, and multiple active groups. In this work, CS-based porous fibers (ZIF-n@CS) consisting of CS and zeolitic imidazolate frameworks (ZIFs) were fabricated through wet spinning and self-assembly methods. This combination effectively utilizes the dual advantages of CS and ZIFs, which effectively remove dyes from water and exhibit excellent recyclability. In addition, the adsorption mechanism of the adsorbent was explored through the analysis of adsorption kinetics, thermodynamics, isotherms, and chemical characterization after adsorption. This work provides an operable and universal strategy for the efficient adsorption of dyes, promoting the further promotion and application of MOFs and CS materials.
研究领域:
材料科学
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环境科学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhenzhong Liu,Suyue Luo,Xinran Yin,Shuo Zhang,Minghui Guo
The present work effectively achieved the production of a self-supporting electrode with high efficiency. The process involves incorporating nickel and molybdenum carbide (Mo 2 C) phases within the channels of wood through high-temperature calcination at the nanoscale. The obtained carbonized wood (CW) possesses low tortuosity and three-dimensional vertical channels, providing an excellent substrate for the preparation of Ni-Mo 2 C/N-CW electrodes. Mo 2 C is well known for its considerable potential as a non-precious metal electrocatalyst with enhanced catalytic activity. The successful doping of nickel and nitrogen into molybdenum carbide not only promotes the formation of β-Mo 2 C, but also improves the electron transfer rate and mass diffusion pathway. Consequently, the Ni-Mo 2 C/N-CW electrode exhibits excellent performance in the hydrogen and oxygen evolution reactions (HER and OER, respectively). Only voltages of 89 and 253 mV are required to achieve a current density of 10 mA cm −2 , respectively. When the Ni-Mo 2 C/N-CW catalyst is used as both cathode and anode during hydrolysis, current densities of 10 and 100 mA cm −2 can be achieved with excellent durability and stability at voltages of 1.56 and 1.72 V, respectively. The distinctive porous structure of the wood substrate is of crucial importance for promoting the adsorption and dissociation of water molecules, enhancing the catalytic performance. In addition, the present material exhibits advantageous characteristics, including a high specific surface area and a significant number of adsorption sites, making it a very promising candidate for applications involving the adsorption of dyes, such as rhodamine B (RhB).
研究领域:
材料科学
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电化学
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环境科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Zhengyan Chen,Runzhuo Xue,Hongtao Chen,Xueyan Zhao,Zhengzheng Guo,Yanling Jin,Fang Ren,Penggang Ren
The low-cost and high-efficiency porous activated carbon materials as adsorbents have attracted extensive attention to solving the increasing problems of water pollution. Aquatic plant Salvinia adnata (SA) derived porous carbon is a promising candidate as an adsorbent due to its wide distribution and low cost, and well-developed porous structure with abundant pores after activation. In this paper, a series of porous Salvinia adnata activated carbons (SAACs) were successfully synthesized via a facile two-step method with carbonization and KOH activation varying different activated temperatures and KOH addition ratios. The morphology and structure of the SAACs were characterized using various analytical and spectroscopic techniques. The prepared SAAC-1000–3 (activated temperature is 1000 °C, mass ratio of SA and KOH is 1:3) exhibits a well-developed hierarchical porous structure with a large specific surface area of 2583 m 2 g −1 and pore volume of 2.17 cm 3 g −1 , which facilitates the diffusion and adsorption of dye molecular into SAAC. The batch adsorption experiments were applied to systematically evaluate the adsorption properties for organic dyes with different contact time, initial concentration, temperature, pH, and co-existing ion concentration. The adsorption performance results show that SAAC-1000–3 demonstrates a fast adsorption process for the complete adsorption of methylene blue (MB) and methyl orange (MO) within 3 min, moreover, it also displays a remarkable maximum adsorption capacity of 643.63 mg g −1 at higher MB concentration of 500 mg L −1 . Furthermore, an ultrahigh removal efficiency of 99.9% for MB after nine adsorption-desorption cycles indicates the good reusability of SAAC. The Salvinia adnata activated carbon can be as an alternative adsorbent for the fast and high-efficiency treatment of dye-containing wastewater. This work also provides a new idea for waste utilization of water plants.
研究领域:
环境科学
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材料科学
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植物学
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产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Xinyu Zhang,Jing Tian,Peipei Wang,Tian Liu,Mehraj Ahmad,Tingwei Zhang,Jiaqi Guo,Huining Xiao,Junlong Song
Biochar has very low adsorption capacity to anionic dyes due to negative charge on the surface. Herein, a dual-templating strategy by mild activators (K 2 C 2 O 4 ·H 2 O and CaCO 3 ) was applied for synthesis of soybean cake nitrogen self-doped biochar (NSB) to enhance the adsorption capacity for dyes. The results of element analysis showed NSB had N contents of 3.51%. Its specific surface area was 2413.00 m 2 g −1 and maximum adsorption amount of Rhodamine B and Congo Red reached up to 839.97 mg g −1 and 882.64 mg g −1 , respectively. The NSB retained high adsorption capacity after 5 cycles. By linear fitting of full Van't Hoff equation , lower enthalpy value shown in Congo Red adsorption in comparison with Rhodamine B adsorption, indicated the efficient anionic dye removal by NSB. Negative heat capacity change value indicated water molecules adsorbed on the NSB surface were replaced by dyes molecules. This paper provides a framework to prepare excellent NSB for the efficient removal of dyes from wastewater and shed lights on the mechanism of how NSB work for respective cationic and anionic dye from thermodynamics.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2012
·
IF 1.58
Yi-Tian Tang,Xiao-Qiu Dou,Zhi-Ang Ji,Ping Li,Shen-Min Zhu,Jia-Jun Gu,Chuan-Liang Feng,Di Zhang
Dye/water separation is a worldwide challenge because of the increasing industrial dye wastewater. In this paper, a novel pH-responsive C 2 -symmetric cyclohexane based hydrogel was developed and was capable of rapidly adsorbing dye molecules in minutes. This hydrogel dye adsorbent was characterized by Fourier transform infrared (FT-IR) spectroscopy, Ultraviolet–visible (UV–vis) spectroscopy, Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). The adsorption equilibrium of the dyes is in good agreement with Langmuir adsorption isotherm model. Moreover, the hydrogel adsorbent can be recovered easily just by changing the pH of the medium, which is promising to be used an efficient dye adsorbent in water purification .
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Zheng Wei,Zhang Peigen,Tian Wubian,Qin Xia,Zhang Yamei,Sun ZhengMing
To modify the adsorption performance of Ti 3 C 2 T x MXene , we report a facile approach to expand the interlayer spacing of Ti 3 C 2 T x and to tune its surface functional groups by hot alkaline solution treatment. In the treatment, the interlayer spacing of Ti 3 C 2 T x MXene is increased by up to 29% by LiOH, and the surface functional groups are tuned by converting -F to -OH. Among the MXenes, LiOH-Ti 3 C 2 T x and NaOH-Ti 3 C 2 T x can faster adsorb methylene blue (MB) than other MXene adsorbents; NaOH-Ti 3 C 2 T x possesses the highest adsorption capacity (189 mg/g) for MB, which can be ascribed to the cooperation of surface adsorption and intercalation adsorption. The experimental data suggest that the enhanced adsorption toward cationic dyes can be best described by a Langmuir isotherm.
研究领域:
材料科学
·
环境科学
✓ 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）