FUEL PROCESSING TECHNOLOGY
·
2015
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IF 3.352
Hui-Ying Sun,Lin-Ping Sun,Fei Li,Long Zhang
The adsorption of benzothiophene from fuels on NaY zeolites modified with 0.09 M NaOH aqueous solution was investigated. The sulfur removal reached to 99.9%, and the adsorption capacity was 1.65 mg benzothiophene/g of the modified adsorbent. The results of the scanning electron microscopy, X-ray diffraction, X-ray fluorescence, and N 2 adsorption–desorption isotherms analyses show that mesopores appeared on the surface of NaY-0.09 adsorbent and the intrinsic crystallinity was preserved after the modification. Py-IR and NH 3 -TPD analyses indicated that the adsorption of benzothiophene occurred on the weak Lewis acid sites on the adsorbent. Both an increase in the number of the weak Lewis acid sites and the formation of mesopores on NaY-0.09 adsorbent improved its desulfurization activity.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 24
·9696-9705
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IF 3.069
Yashi Chen,Qing Li,Xinhong Chen,Xi Xu
Although the construction process of dual functional materials for dye and oil/water separation has been developed rapidly, the postprocess of the used separation materials themselves is still a problem owing to their non-degradation in the natural environment. Herein, novel porous membranes (PLA–PEI) are successfully prepared based on the utilization of a dip-coating technique. The adsorption isotherms and kinetics present a good correlation with Langmuir isotherms and the pseudo-second-order model, respectively. The maximum adsorption capacity of PLA–PEI for methyl orange (MO) can reach 455.10 mg g−1, which is approximately 78 times as much as that of PLA (5.82 mg g−1). In addition, the separation efficiencies of three actual oils (methylbenzene, hexamethylene and soybean oil) are all higher than 99.7%. Moreover, the obtained membranes can realize high-efficiency and simultaneous removal of MO (removal efficiency > 99.8%) and oil droplets (oil rejection > 99.7%) from mixed wastewater under a permeate flux of up to 8285 L m−2 h−1 solely driven by gravity. These results suggest that PLA–PEI is a promising and competitive candidate for water purification.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Long Jiang,Yaojie Liu,Xu Meng,Mo Xian,Chao Xu
Removal of toxic heavy metals needs to be assured from drug substances and catalyst residues from waste streams at the ppm level which has sometimes proved difficult, causing irreversible harm to human health and environment. Herein, on basis of binding evaluation between isothiocyanate derivatives in Pd(MeCN) 2 Cl 2 model solution, the corresponding functional materials were prepared by efficiently nucleophilic substitution and isomerization reaction on polystyrene framework. The isomerization from thiocyanide to isothiocyanate gifted SCN-2-NCS excellent Pd 2+ adsorption capacity which could tolerate various composite solvent systems and was generally superior than the widely-used isothiourea modified material PSTU. Systematic thermodynamics and kinetics study indicated the complexation with Pd 2+ was kinetically hindered and the increase of temperature contributed to the adsorption process as the maximum adsorption capacity was evaluated as 4.995 mmol·g −1 . The breakthrough point for SCN-2-NCS was 385–390 BV in Pd(MeCN) 2 Cl 2 solution (1.000 mmol·L -1 ) and reached to 126–130 BV in Pd-catalyzed debenzylation waste stream (5.433 mmol·L -1 ). Subsequently, computational chemistry certified an electrophilic addition reaction occurred to generate a five-member Pd 2+ complex in adsorption process which could be converted to N-substituted thiocarboxylic acid in acid condition, and FTIR, NMR and XPS analysis were further employed to probe the proposed adsorption mechanism.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Tuo Di,Yunxia Xia,Baoyou Pei,Tingting Zhu,Tiansheng Zhao,Tiesheng Li,Lei Li
The development of simple and highly effective desulfurization technology is attracting more and more interest in both industrial and academic fields. Here, a new family of precursors was prepared based on hyper-cross-linked asphalt and coal tar building blocks. Thanks to the preintroduced porous structure, the precursors were converted into carbons with high surface area and large micropore volume via a uniform carbonization process. The synergistic effects of high surface area, abundant microporous structure, and the introduced polar functional groups endow the carbon materials with high desulfurization performance. The results of repeated experiments show that the adsorption capacities of five carbonized samples are higher than 40 mg S g–1, and the theoretical maximum adsorption capacity reaches 44.7 mg S g–1. Particularly, the adsorption equilibrium of all the carbonized samples can be reached in 5 min. Moreover, the recycle adsorption performance was also studied. Toluene exhibits the best elution effect among three eluents (iso-octane, para-xylene, and toluene) and the adsorption capacity remains 89% of the initial adsorption capacity after two adsorption–desorption cycles. It is believed that both innocent treatment of byproducts from petroleum industry and their high-value application for deep desulfurization in liquid hydrocarbon fuels benefit environmental protection and sustainable development.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2020
·
IF 5.647
Yong Liu,Jingfu Wang,Jingan Chen,Zuxue Jin,Shiming Ding,Xiaohong Yang
The phosphate oxygen isotope (δ 18 O P ) ratio has been proven to be an effective tool to trace the sources and biogeochemical cycles of phosphorus (P) in aquatic ecosystems . However, the enrichment of phosphate (PO 4 ) and the removal of impurities are quite complex and easy to cause PO 4 loss in current δ 18 O P analytical methods. Moreover, the δ 18 O P value obtained by the commonly-used instantaneous sampling method is more of the instantaneous information of P, which is accidental or uncertain for accurate identification of the P source. In this study, a new method of in situ enrichment, elution, and purification of PO 4 (ISEEP) was developed for δ 18 O P analysis in waters. This method utilized a PO 4 binding phase (Zr-Oxide gel) to selectively in situ adsorb PO 4 in water and exhibited an adsorption capacity per unit area of up to 789.3 μg P/cm 2 . The PO 4 on the gel was eluted easily with a 1 M NaOH solution. More than 99.7% of the common anions, cations, and dissolved organic matter (DOM), as well as more than 90% of the trace elements were removed synchronously after adsorption and elution of PO 4 . The recovery rate of PO 4 in the whole procedure was as high as 92.8%. The XRD and SEM examinations showed that the ISEEP can obtain high-purity Ag 3 PO 4 solid for the δ 18 O P measurement. The reliability of the ISEEP method is confirmed by the measured δ 18 O P value and standard deviation of parallel samples from different types of natural waters obtained by both the ISEEP and the current popular McLaughlin (2004) method. It provides a good prospect of this new method for tracing the P sources and their biogeochemical cycling in aquatic ecosystems.
研究领域:
环境科学
·
生物地球化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Jun-Qing Jiang,Cheng-Xiong Yang,Xiu-Ping Yan
1H-benzotriazole (BTri) and 5-tolyltriazole (5-TTri) are emerging pollutants; the development of novel materials for their efficient adsorption and removal is thus of great significance in environmental sciences. Here, we report the application of zeolitic imidazolate framework-8 (ZIF-8) as a novel adsorbent for fast removal of BTri and 5-TTri in aqueous solution in view of adsorption isotherms, kinetics and thermodynamics, desorption, and adsorbent regeneration. The adsorption of BTri and 5-TTri on ZIF-8 was very fast, and most of BTri and 5-TTri were adsorbed in the first 2 min. The adsorption for BTri and 5-TTri follows a pseudo-second-order kinetics and fits the Langmuir adsorption model with the adsorption capacity of 298.5 and 396.8 mg g–1 for BTri and 5-TTri at 30 °C, respectively. The adsorption was a spontaneous and endothermic process controlled by positive entropy change. No remarkable effects of pH, ionic strength, and dissolved organic matter on the adsorption of BTri and 5-TTri on ZIF-8 were observed. The used ZIF-8 could be regenerated effectively and recycled at least three times without significant loss of adsorption capacity. In addition, ZIF-8 provided much larger adsorption capacity and faster adsorption kinetics than activated carbon and ZIF-7. The hydrophobic and π–π interaction between the aromatic rings of the BTri and 5-TTri and the aromatic imizole rings of the ZIF-8, and the coordination of the nitrogen atoms in BTri and 5-TTri molecules to the Zn2+ ions in the ZIF-8 framework was responsible for the efficient adsorption. The fast adsorption kinetics, large adsorption capacity, excellent reusability as well as the pH, ionic strength, and dissolved organic matter insensitive adsorption create potential for ZIF-8 to be effective at removing benzotriazoles from aqueous solution.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Fangzhu Xiao,Tao Huang,Shuwen Zhang,Longfei Liu,Cheng Wang,Guowen Peng,Shuya He
The fallout of the radioactive nuclide cesium (Cs) has posed its potential environmental threat to human health and ecosystem during the Fukushima accident. Thus, Cs decontamination from radioactive wastewater is strongly required for treating similar occurrences. In this work, a coupling method was applied to achieve Cs + removal and solidification in one conducting system. Ammonium molybdophosphate (AMP) was loaded to blast furnace slag (BFS) particles for the preparation of adsorbent (BFS-AMP) and binder. The maximum adsorption capacity of BFS-AMP for Cs + was 23.36 mg/g obtaining at the pH of 8 and the initial concentration of 500 mg/L in the equilibrium adsorption experiments. Cs + uptake confirmed to the pseudo-first-order kinetic model . Electrokinetics (EK) not only increased the adsorption capacity of BFS-AMP also enhanced the migration of Cs + ions from the anode to cathode in the electrolyzer . The transfer of Cs + ions from liquid to solid in the electrolyzer was controlled by both voltage gradients and flow rates. The solidification of EK-treated BFS-AMP mortar was mainly dominated by the mass ratios (wt.%) of alkali activator to adsorbent and the initial pH values. Cs + leaching from the solidified products of EK-treated BFS-AMP mortars ranged from approximately 1.18 × 10 −7 to 9.54 × 10 −6 g cm −2 ∙d −1 . The electromigration , geopolymer stabilization, and hydration encapsulation were concluded as the main incorporation mechanisms for Cs + ions transferring from the stock solution into the BFS-AMP-based solidification in the electrolyzer.
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 Cleaner Production
·
2021
·
IF 9.297
Hong Ma,Yilin Yang,Fengyue Yin,Xiong-Fei Zhang,Jianhao Qiu,Jianfeng Yao
Metal-organic frameworks (MOFs) have been widely explored as adsorbents for heavy metal ions removal. However, the recovery and regeneration of powdery MOFs remains a huge challenge. In this work, MIL-121 (Al-based MOF) crystals were incorporated into biodegradable alginate matrix to form composite beads with enhanced recyclability and adsorption capacity . A systematic adsorption test for Cu 2+ and Cd 2+ was conducted and the optimal sample (with a MOF loading of 50 wt%) presented an adsorption capacity of 204.5 mg/g for Cu 2+ and 88.7 mg/g for Cd 2+ . Moreover, the composite beads can be regenerated effectively by hot water (80 °C). The desorption is attributed to the carboxyl-rich MIL-121, which could release massive protons (H + ) at elevated temperature. Compared with the traditional desorption using strong acids, this chemical-free thermal desorption strategy holds a great potential for adsorbent regeneration and practical wastewater treatment .
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
Polymer Chemistry
·
2023
·Vol. 14
·期 24
·2902-2915
·
IF 4.6
Xu Zhang,Dagang Li,Chang Cui,Shusen Chen,Meng Ji,Weiwu Tang,Le Yang,Fengqi Zhang,Jinying Li,Dongxiang Zhang,Xiyan Xu
Uranium extraction from seawater (UES) has important strategic significance as it can provide a solution to alleviate the future shortage of uranium resources for nuclear power production. This work reports an alginate-based three-dimensional (3D) supermacroporous AO-PAM/Alg hydrogel fabricated by facile cryo-polymerization and two-step grafting modification for efficient UES. The supermacroporous and 3D interconnected pore structure of AO-PAM/Alg facilitates an increased contact flux of seawater and the diffusion rate of uranyl ions. It shows a maximum uranium adsorption capacity of 1375 mg g−1 at room temperature (25 °C) and a pH of 6.0. In seawater, AO-PAM/Alg reaches adsorption equilibrium within 20 days, with a final adsorption capacity of 6.23 mg g−1. AO-PAM/Alg also exhibits considerable reusability and adsorption selectivity. The current AO-PAM/Alg hydrogel holds great potential for practical UES. The current macroporous adsorbent preparation strategy can be further applied to other 3D supermacroporous adsorbent materials.
研究领域:
材料科学
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环境科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2015
·Vol. 91
·期 5
·1378-1386
·
IF 2.349
Qiujin Jia,Dongping Li,Xuechuan Gao,Jilong Yan,Qinglin Ma,Fanjun Meng
BACKGROUND Although methyl acrylate has been graft polymerized from cellulose and functionalized with hydrazine and hydroxylamine for removal of copper and nickel ions, the adsorption capacity was less than 80 mg g −1 . The present work reported hydrazinolysis of cellulose-graft-polymethyl acrylate and remarkably improved adsorption capacity for Cu(II) and Ni(II) in aqueous solution. RESULTS Hydrazinolyzed cellulose-graft-polymethyl acrylate (Cell-g-PMA-HZ) has been prepared by ceric salt-initiated graft polymerization of methyl acrylate from microcrystalline cellulose surface and subsequent hydrazinolysis with hydrazine hydrate. The successful synthesis was confirmed by Fourier-transform infrared spectroscopy, 13 C-NMR, elemental analysis, scanning electron microscopy and thermogravimetric analysis. Adsorption behavior of Cell-g-PMA-HZ for Cu(II) and Ni(II) were studied through batch static adsorption processes and column chromatography methods. The influences of graft yield, initial pH, contact time and temperature on adsorption capacity of Cell-g-PMA-HZ as well as adsorption equilibrium, kinetic and thermodynamic properties were studied in detail. Kinetic adsorption can be explained by pseudo-second-order and adsorption isotherms fitted with Langmuir isotherm model, from which maximum equilibrium adsorption capacity can be derived as 229.36 mg g −1 for Cu(II) and 173.91mg g −1 for Ni(II) at 28°C. Further thermodynamic investigation indicated that adsorption of Cu(II) and Ni(II) by adsorbent Cell-g-PMA-HZ was exothermic and spontaneous under the studied conditions. CONCLUSIONS Hydrazinolysis of cellulose-graft-polymethyl acrylate has been accomplished. As an adsorbent, the prepared Cell-g-PMA-HZ was reusable and fairly efficient for removal of Cu(II) and Ni(II) from aqueous solution. © 2015 Society of Chemical Industry
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Bing Chen,Yanhui Li,Meixiu Li,Mingfei Cui,Wenshuo Xu,Liubo Li,Yaohui Sun,Mingzhen Wang,Yang Zhang,Kewei Chen
By improving the synthesis process of MOF-525, MOF-525 was grown on the surface of graphene oxide (GO), and thus the MOF-525/GO composite was obtained for the adsorption of tetracycline (TC) in water. MOF-525 and GO can be identified on the surface of MOF-525/GO, and the BET surface area measured is up to 444.49 m 2 g −1 . MOF-525 and GO are bonded by coordination bonds, and the lattice structure of MOF-525 is retained in the composite. Both GO and MOF-525 have good adsorption properties, the maximum adsorption capacity is 236.7 mg g −1 and 371.5 mg g −1 , respectively. The maximum adsorption capacity of MOF-525/GO reaches 413.6 mg g −1 , indicating that GO does not weaken the adsorption performance of MOF-525, but further strengthens. The initial adsorption rate of MOF-525/GO for TC was very fast (the adsorption removal rate reached 47% within 2 min), and the adsorption removal amount is almost unchanged after 360 min. Elovich model and Sips model fitted the adsorption process well, revealing that the adsorption process was exothermic reaction dominated by chemisorption and the maximum adsorption capacity was 436 mg g −1 . In addition, MOF-525/GO carries a negative charge, and the adsorption performance gradually decreases with the increase of pH value. The adsorption capacity of MOF-525/GO was mainly derived from π-π stacking and hydrogen bonding , and the complexation between Zr and TC was also involved in the rapid adsorption stage.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 324
·期 3
·1329-1337
·
IF 1.137
Zeng Dejun,Dai Ying,Zhang Zhibing,Wang Youqun,Cao Xiaohong,Liu Yunhai
In this work, the magnetic hydroxyapatite composite (Fe 3 O 4 @HAP) was prepared and used to remove of U(VI). The characterizations of transmission electron microscope and vibrating sample magnetometer indicated that the average size and saturation magnetizations ( M s ) of Fe 3 O 4 @HAP was about 360 nm and 20.89 emu g −1 , respectively. The results of solid-phase extraction indicated that at pH 5.0, the removal efficiency of Fe 3 O 4 @HAP was more than 95% within 20 min. The maximum adsorption capacity ( q m ) of Fe 3 O 4 @HAP was 789.58 mg g −1 . Therefore, Fe 3 O 4 @HAP may be a rapid and highly efficient magnetic adsorbent to remove of U(VI) from water.
研究领域:
环境科学
·
材料科学
✓ 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）