Journal of the Taiwan Institute of Chemical Engineers
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2016
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IF 2.848
Huan Chen,Shihai Cao,Jinhua Yao,Fang Jiang
A novel Ag nanowires–CdS–Au (Ag NWs–CdS–Au) photocatalyst was synthesized by a two-step solvothermal method. As a metal core, thioglycolic acid (TGA) functionalized Ag NWs provided abundant active sites, facilitating the attachment of CdS ; and the excessive S 2− on the surface of CdS favored the loading of Au, leading to the well-developed combined interface of Ag NWs–CdS and CdS–Au. The combination and interaction between Ag NWs–CdS and CdS–Au was beneficial to the electron transfer in the photocatalysis. Multiple electron transfer processes happened in the Ag NWs–CdS–Au photocatalyst, enhancing charge carrier separation efficiency. Therefore, Ag NWs–CdS–Au possessed much higher photocatalytic degradation efficiency (89%) of MB than that of Ag NWs–CdS (45%) under visible light irradiation. Additionally, the Ag NWs–CdS–Au photocatalyst could absorb more visible light, favoring the generation of leuco-methylene blue (LMB) molecules, and further promoting the formation of ·OH. The finding provides a novel method to obtain bimetallic photocatalyst with separated bimetals to achieve high visible light photocatalytic activity and stability.
研究领域:
材料科学
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化学
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纳米技术
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环境科学
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DOI
高影响因子
MOLECULES
·
2018
·Vol. 23
·期 6
·1342
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IF 3.098
Yimei Ren,Chang Cui,Pengjie Wang
An anionic adsorbent was prepared by grafting citrate onto pomelo peel (PPL) to remove methylene blue (MB) from aqueous solution. The PPL and modified pomelo peel (MPPL) were analyzed by Fourier transform infrared spectroscopy (FTIR) and observed by scanning electron microscopy (SEM). The effects of dye concentration, contact time, and pH on adsorption were studied. The FTIR results confirmed that the carboxyl groups were successfully bound to cellulose molecules in PPL via modification with citrate. SEM indicated that the surface of PPL became clean and the porous structure was well maintained after modification. The adsorption capacities of MB onto PPL and MPPL were 81.7 mg/g and 199.2 mg/g, respectively, thus indicating that the addition of anionic groups significantly improved the adsorption performance. The increase in the initial dye concentration and pH of the dye solution promoted the adsorption process. The adsorption equilibrium on MPPL required approximately 3 h. The adsorption of MB on MPPL was well described by a pseudo-second order kinetic model and Langmuir isotherm model. The thermodynamic parameters indicated spontaneous and exothermic adsorption. This study suggests that PPL modified with citrate can be used as a sustainable adsorbent in wastewater purification.Keywords:pomelo peel;modification;citric acid;adsorption;methylene blue
研究领域:
环境科学
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材料科学
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化学工程
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DOI
PubMed
高影响因子
INTEGRATED FERROELECTRICS
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2020
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IF 0.557
Bingqi Pan,Peisong Tang,Shanshan Gao,Weibin Shen,Haifeng Chen
Using lutetium oxide, nitric acid, ammonium vanadate and citric acid as main materials, LuVO4 was prepared by a facile sol-gel method. The gel of LuVO4 was kept at 100 °C for 24 h to get the xerogel. Then, the xerogel was, respectively, calcined in muffle furnace at 500 °C, 600 °C, 700 °C and 800 °C to make single phase nanoparticulate LuVO4. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared (FT-IR) spectroscopy and diffuse reflectance spectroscopy (DRS). The results showed that the pure LuVO4 can be obtained through calcination at 700–800 °C. LuVO4 had an average particle size of 100 nm and the band gap was 2.25 eV. The photocatalytic activities of LuVO4 were investigated by methylene blue which was used as simulated sewage. Under visible light, LuVO4 showed good photocatalytic degradation activity for degradation of methylene blue. This indicated that LuVO4 has broad practical application prospects in the field of photocatalytic degradation of organic pollutants.
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
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2022
·Vol. 23
·期 3
·1668
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IF 6.208
Yansong Ji,Xiaoning Zhang,Zhenyu Chen,Yuting Xiao,Shiwei Li,Jie Gu,Hongmei Hu,Guotao Cheng
The recycling and reuse of biomass waste for the preparation of carbon-based adsorbents is a sustainable development strategy that has a positive environmental impact. It is well known that a large amount of silk sericin (SS) is dissolved in the wastewater from the silk industry. Utilizing the SS instead of discharging it into the environment without further treatment would reduce environmental and ecological problems. However, effective enrichment of the SS from the aqueous solution is a challenge. Here, with the help of carboxymethyl chitosan (CMCS), which can form a gel structure under low voltage, an SS/CMCS hydrogel with SS as the major component was prepared via electrodeposition at a 3 V direct-current (DC) voltage for five minutes. Following a carbonization process, an SS-based adsorbent with good performance for the removal of methylene blue (MB) from an aqueous solution was prepared. Our results reveal that the SS/CMCS hydrogel maintains a porous architecture before and after carbonization. Such structure provides abundant adsorption sites facilitating the adsorption of MB molecules, with a maximum adsorptive capacity of 231.79 mg/g. In addition, it suggests that the adsorption is an exothermic process, has a good fit with theLangmuirmodel, and follows the intra-particle diffusion model. The presented work provides an economical and feasible path for the treatment of wastewater from dyeing and printing.Keywords:silk sericin;hydrogel;carbonization;adsorption;methylene blue
研究领域:
环境科学
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材料科学
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废水处理
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2021
·Vol. 28
·期 47
·67098-67107
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IF 4.223
Long Yingtao,Liang Jianjun,Xue Yinghao
A novel composite (nZVI/Pd-AC) was prepared by loading nanoscale zero-valent iron (nZVI) and Pd on activated carbon (AC) electrode under electrodeposition with ultrasound, which was used to reductive degradation of methylene blue (MB). The loading contents of Fe and Pd in composite materials were 15.84% and 2.06%, respectively. XPS results further confirmed that the as-prepared material contained Fe 0 and Pd 0 . Without external conditions, MB could be degraded in the presence of nZVI/Pd-AC and reached equilibrium within 180 min. To investigate the reusability, the re-electrodeposition strategy was effective to refresh the active sites of nZVI/Pd-AC, and the removal efficiency only reduced by 4.51% in five circles indicating the good reusability of nZVI/Pd-AC composites. GC–MS was used to identify possible degradation pathways of MB; the results showed that the degradation products were mainly N, N-dimethylaniline and 2-amino-5-dimethylamino-benzenesulfonic acid. And the S–C, C–N bonds are the sites easier to be attacked. Graphical abstract
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Scientific Reports
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2020
·Vol. 10
·期 1
·1-9
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IF 3.998
Bai Suzhen,Wang Tiantian,Tian Zhengshan,Cao Kesheng,Li Jitao
Activated carbons derived from biomass have been proved to be one of the most promising adsorbents due to their abundance, low cost, reproducibility and environmental friendliness. In this study, a simple, facile and effective pyrolysis method was demonstrated to prepare hierarchical porous biomass charcoal by using peanut shells as precursor without chemical activation in an electric muffle furnace. The obtained products hold porous structure and abundant oxygen-containing functional groups, which were mainly due to in-built template of the structure of peanut shell and the preparation process without nitrogen protection, respectively. Interestingly, the obtained biomass charcoal sample with excellent adsorptive property quickly removed Pb 2+ (100 mg/L) and methylene blue (50 mg/L) from water with removal efficiency of 96.5% and 97.1%, and removal capacity of 48 mg/g and 24 mg/g, respectively. The synthetic process was simple and economical, and it could be used as a beneficial reference in the recycling of biomass waste.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Meiling Yang,Xiaolin Liu,Yunchuan Qi,Wen Sun,Yi Men
A series of environmental-friendly adsorbents, κ-carrageenan/graphene oxide gel beads (κ-Car/GO GBs), were synthesized from κ-carrageenan and graphene oxide via a simple method. The composition and morphology of these gel bead adsorbents were characterized by Fourier transform infrared spectroscopy , Raman spectroscopy , X-ray photoelectron spectroscopy, thermogravimetric analysis , scanning electron microscopy, etc. The adsorption ability of κ-Car/GO GBs was investigated by measuring the removal of methylene blue (MB) from aqueous solutions. The effects of the initial dye concentration, adsorption time, temperature and pH value were evaluated. The results of the adsorption experiments were consistent with the Langmuir model, while the adsorption kinetic data were fit with a pseudo-second-order model. The maximum adsorption capacity of κ-Car/GO GBs for MB is 658.4 mg/g at 25 °C, which barely declined even after five cycles. Hence, the κ-Car/GO GBs are outstanding adsorbents with high adsorption capacity and excellent regeneration ability. Furthermore, the gel bead adsorbents could be easily separated from aqueous solutions after adsorption using a simple filtration method.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2014
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IF 3.065
Ji-Ming Song,Cheng-Cheng Liu,Song-Song Zhang,He-Lin Niu,Chang-Jie Mao,Sheng-Yi Zhang,Yu-Hua Shen
Adsorption is an effective method of removing contaminants from water, however, desorption often becomes more difficult after adsorption process, due to the strong binding force between the adsorbent and pollutants, so that the desorbent cannot be reused. In this paper, Co 0.85 Se nanosheets prepared through a hydrothermal reaction have been used to remove cationic dye methylene blue from aqueous solution in the presence of sodium borohydride. The results show that adsorption/desorption properties of the Co 0.85 Se nanosheets to MB can be greatly changed in the presence/absence of sodium borohydride (NaBH 4 ), and the equilibration time of the adsorption/desorption depends on the amount of NaBH 4 . When NaBH 4 or Co 0.85 Se nanosheets existed together, the residual quantity of MB in solution was less than one-twentieth of that in the system alone using either NaBH 4 or Co 0.85 Se nanosheets; while a large number of MB (ca.90%) was released once again into the solution after NaBH 4 was decomposed because of catalysis of Co 0.85 Se. The zeta potential and pH tests have been elucidated the mechanism for the adsorption of MB onto Co 0.85 Se nanosheets. The efficient adsorption and recovery of dyes indicate that the prepared Co 0.85 Se nanosheets have potential application in wastewater treatment under the assistance of NaBH 4 .
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
Desalination and Water Treatment
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2015
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IF 1.173
Rong Ping Chen,Yin Long Zhang,Xiao Yan Wang,Cheng Yue Zhu,Ai Jun Ma,Wei Min Jiang
In this paper, magnetic Fe3O4/HA nanoparticles (MHA) were synthesized using a coprecipitation method. The structure and properties of the MHA were characterized by Fourier transform infrared spectroscopy, TG, transmission electron microscope, zeta potential, X-ray diffraction, and vibration sample magnetometer. MHA is proven to be stable in water and can be easily separated from solution under an external magnetic field. Adsorptive removal of methylene blue (MB) from aqueous solution using MHA was systematically studied. The fundamental adsorption experiments reveals that MHA is more efficient in dye removal when initial solution pH is higher than 4.0. The theoretical maximal adsorption capacity, which is based on the simulation results from the isothermal equilibrium study, is 200 mg/g. The adsorption kinetic and equilibrium behaviors of MHA are in agreement with pseudo-second-order model and Langmuir model, respectively. The value of activation energy (Ea) indicates that the adsorption of MB onto MHA is a physical process. The Gibbs free energy of the adsorption process (△G) is negative, indicating that the adsorption of MB onto MHA is thermodynamically favorable. Furthermore, MHA could be easily regenerated and reused with almost no loss of adsorption capacity, which is satisfactory for practical applications.
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
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2020
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IF 4.706
Yaru Shang,Xiaohu Cheng,Ruixia Shi,Qian Ma,Yingzi Wang,Ping Yang
The adsorption experimental results show that W 18 O 49 with oxygen vacancies not only has faster adsorption rates for MB but also has larger adsorption capacities than WO 3 . Besides, the maximum adsorption capacity of urchin-like W 18 O 49 (375.94 mg/g) is about 2.76 times of WO 3 (136.25 mg/g). However, photocatalytic results revealed that WO 3 has better photocatalytic degradation ability than W 18 O 49 . Generally, the adsorption efficiency of urchin-like W 18 O 49 (70.01%) is about 3.94 times of WO 3 (17.78%), while the photodegradation efficiency of WO 3 (62.45%) is 2.38 times of urchin-like W 18 O 49 (26.20%). Therefore, urchin-like W 18 O 49 has the best total removal efficiency, which can remove 96.21% of MB (50 ml, 90 mg/L) within 120 min. These studies emphasize the comprehensive effects of WO 3 and W 18 O 49 on dye removal from two aspects of adsorption and photocatalysis and provide strategies for the preparation of efficient dye removal materials.
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
RSC Advances
·
2015
·Vol. 6
·期 5
·3446-3457
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IF 3.84
Jiangdong Dai,Jun Sun,Atian Xie,Jinsong He,Chunxiang Li,Yongsheng Yan
Herein, the first preparation of a novel 3D hierarchically porous carbon (3D HPC) via precarbonization and in situ alkali activation, wherein mesoporous polydivinylbenzene (meso-PDVB) synthesized by a facile and general solvothermal route was used as the carbon precursor, is reported. Its physico-chemical properties were characterized by SEM, TEM, XRD, FT-IR, elemental analysis, Raman spectroscopy and N2 adsorption–desorption isotherm. 3D HPC exhibited a very large SSA of 3131.32 m2 g−1 and a pore volume of 1.462 cm3 g−1. Moreover, 3D HPC was used to eliminate a dye from wastewater for the first time. The effects of the contact time, initial dye concentration, temperature and solution pH on the adsorption of methylene blue (MB) onto 3D HPC were investigated by batch techniques. The isotherm and kinetics data were well described by a Langmuir model and a pseudo-second-order kinetic model, respectively. 3D HPC had a high adsorption affinity for MB over a broad pH range. 3D HPC displayed remarkably strong adsorption of MB, with a maximum adsorption capacity of 717.77 mg g−1 at 308 K. The adsorption process was endothermic and spontaneous, and the kinetics was controlled by film and intra-particle diffusion. The mechanism of the adsorption of MB was mainly attributed to van der Waals forces, π–π stacking and electrostatic interactions. In addition, 3D HPC displayed excellent reusability and exhibited promising potential for the treatment of dyes in 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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
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IF 4.784
Changquan He,Lei Shi,Sichao Lou,Bao Liu,Wenqing Zhang,Lingfan Zhang
In this present study, spherical magnetic calcium modified chitosan micro-particles (MG-Ca-CMPs) were synthesized by using embedding/cross-linking method and employed as an efficient adsorbent for Orange II (OII) in single system and coexisted with methylene blue (MB) in binary system. The obtained MG-Ca-CMPs were characterized by fourier transform infrared spectrometer, transmission electron microscopy , scanning electron microscope, X-ray diffraction and magnetic property measurement system analyses, which demonstrated that the MG-Ca-CMPs possessed core-shell structure and excellent superparamagnetic property. The adsorption behaviors for OII in single system and coexisted with MB in binary system were systematically studied. Adsorption experiments data showed that MG-Ca-CMPs presented an excellent high affinity to acid dye OII (q max = 962 mg·g −1 ) in single system, which followed the Langmuir isotherm model and pseudo-second order kinetics model. Interestingly, MB, hardly adsorbed in acidic solution, had effective adsorption performance (increased from 20 mg·g −1 to 350 mg·g −1 ) in binary system by MG-Ca-CMPs. This result was attributed to the synergistic effect caused by the positive and negative charge attraction between OII and MB, forming the positive-negative-positive adsorption mechanism. It is believed that MG-Ca-CMPs could be used as a potential adsorbent for the adsorption and separation of coexisting anionic-cationic dyes from dye wastewater.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）