Polymers
·
2018
·Vol. 10
·期 4
·437
·
IF 2.935
Bing Zhang,Shixing Wang,Likang Fu,Libo Zhang
A new adsorbent was prepared via modified poly(glycidyl methacrylate) with 8-aminoquinoline (AQ-PGMA) for the recovery of Pd(II) from solution. The practical application values of AQ-PGMA, including efficiency, selectivity and reusability for the recovery of Pd(II), are proved by the various experiment parameters. The parameters include HCl concentration, adsorption time, initial Pd(II) concentration, coexisting ions and reused cycles. The prepared AQ-PGMA showed a high adsorbing capacity for Pd(II) (up to 267.90 mg/g) when the concentration of HCl is higher than 0.4 mol/L. The analysis of the adsorption process indicated that the adsorption kinetics followed a pseudo-second-order kinetic model and the adsorption isotherms obeyed the Hill model. The Hill model showed that one adsorption site on the AQ-PGMA could combine 1.45 Pd(II). In addition, the obtained adsorbent demonstrated good regenerative ability and satisfying selectivity for the recovery of Pd(II). The adsorption mechanism was dominated by the chelation and ion exchange reactions between amines/hydroxyl groups and Pd(II). The experiments confirmed that AQ-PGMA was efficient for recovery of Pd(II) from highly acidic aqueous solutions.Keywords:adsorption;palladium;efficiency;selectivity;reusability
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANO
·
2015
·
IF 1.09
Desheng Xi,Xiaojuan Deng,Huijun Li,Pei Yao
Allura red (AR) is a water-soluble synthetic colorant often used as an additive in the food industry, but excess AR can be harmful to human health. In this work, we report the development of a new removal method for AR by using amino-functionalized microspheres with Fe 3 O 4 cores and twolayer shells composed of SiO 2 particles and perpendicularly aligned mesoporous SiO 2 (designated Fe 3 O 4 @nSiO 2 @mSiO 2 –NH 2 ). The material exhibits good dispersibility in aqueous solutions and a high saturation magnetization of 45.68 emu g − 1 , and can be magnetically separated efficiently with an external magnet. Importantly, the material has great adsorption capacity of 29.6 mg g − 1 for AR and the capacity for reuse with a simple treatment. The adsorption process is very fast and the kinetics data are consistent with a pseudo-second order model. Based on these, a rapid and efficient method for extraction and analysis of AR in water and soft drinks has been established.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 2
·159
·
IF 2.935
Chao Xiong,Shixing Wang,Libo Zhang,Ying Li,Yang Zhou,Jinhui Peng
A new adsorbent(A-PGMA) has been synthesized via functionalizing poly(glycidyl methacrylate) microsphere with 2-aminothiazole and used to adsorb gold ions from aqueous solutions. The adsorbent was characterized by X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET), Zeta potential, scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FT-IR). The influence factors such as the pH value of the solution, the initial gold ion concentration and the contact time were examined. Simultaneously, the adsorption process of the gold ion on A-PGMA fitted well with the Langmuir and pseudo-second-order models, respectively. The results showed that the maximum adsorption capacity was 440.54 mg/g and the equilibrium time of adsorption was about 3 h under pH 4. Moreover, the adsorbent has a high reusability after five cycles and good selectivity from coexisting ions, including Zn(II), Mg(II), Cu(II), Ge(IV) and B(III). The adsorption mechanisms of gold ions were ion exchange and chelation between the sulfur and nitrogen groups on the surface of A-PGMA and AuCl4−. Therefore, the adsorbent has a great potential for adsorption of gold ions from aqueous solutions.Keywords:adsorption;gold;reusability;mechanism;selectivity
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2021
·Vol. 11
·期 10
·1219
·
IF 4.146
Jun Qiao,Tian Wang,Kai Zheng,Enmu Zhou,Chao Shen,Aiquan Jia,Qianfeng Zhang
A novel reusable Fe3O4@NC@Pt heterogeneous catalyst was synthesized by immobilizing platinum on nitrogen-doped carbon magnetic nanostructures. It was characterized by infrared analysis (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM). The catalytic efficiency of Fe3O4@NC@Pt was investigated by reduction of nitro aromatic compounds. The catalyst showed good catalytic activity, wide range of substrates, and good chemical selectivity, especially for the substrates of compounds containing halide and carbonyl groups. The magnetically catalyst can readily be reused up to ten cycles without loss of catalytic activity. Moreover, the key pharmaceutical intermediateLorlatinican be facilely achieved through this strategy.Keywords:reusable;magnetic;platinum;selective reduction;nitroarenes
研究领域:
化学
·
材料科学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2013
·Vol. 143
·期 5
·463-468
·
IF 2.244
Zhu Anlian,Li Qianqian,Li Lingjun,Wang Jianji
Abstract A series of choline-based ionic liquids (CIL) have been synthesized in this work. The results suggested that both the cations and the anions have significant influences on their properties such as thermostabilities, acidities and their performances for the synthesis of 3,4-dihydro-2(H)-pyrimidinones. The optimized catalytic system based on the CIL [DMEA][HSO 4 ] for the Biginelli reactions benefits from the wide substrates tolerance, benign reaction conditions, easy work-up procedures, and the feasible reusability of the ionic liquid. Graphical Abstract The thermostabilities, acidities, and the catalytic activities for the Biginelli reactions are all follows the sequence of [DMEA][HSO 4 ] > [Choline] [HSO 4 ] > [DMEA][H 2 PO 4 ] > [Choline] [H 2 PO 4 ] .
研究领域:
有机化学
·
催化化学
·
药物合成
✓ 已验证
DOI
高影响因子
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
·
2012
·Vol. 16
·期 09
·1032-1039
·
IF 1.405
Xiantai Zhou,Hongbing Ji
Highly efficient aerobic epoxidation of olefins catalyzed by cationic meso -tetrakis-(1-methyl-4-pyridyl) (TM4PyP) metalloporphyrins immobilized into montmorillonite (MT) interlayer was achieved. The heterogeneous catalysts were characterized by diffuse reflectance UV spectra, infrared, X-ray diffraction, nitrogen adsorption isotherm and scanning electron microscopy. Manganese porphyrin (MnTM4PyP-MT) showed excellent activity and selectivity for the aerobic epoxidation of olefins under ambient conditions, in which more 90% yields of epoxides were obtained. The clay basal spacing played significant role in the catalytic efficiency and selectivity for different olefins. The catalyst could be reused consecutively five times without significant loss of activity.
研究领域:
化学催化
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 328
·期 3
·1161-1172
·
IF 1.371
Cui Mingzhu,Xiang Siyu,Zhang Siyu,Long Ting,Luo Zhenghang,Yang Haijun
In this paper, an amidoximated polyorganophosphazene (PCCP-AO) adsorbent was concizely synthesized via poly(cyclotriphosphazene- co -polyethyleneimine) (PCCP) prepared from hexachlorocyclotriphosphazene (HCCP) and polyethyleneimine (PEI). PCCP and PCCP-AO were characterized by FTIR, SEM, BET and TGA. SEM images showed that both adsorbents had a morphorlogy of microsphere. The influences of pH values, contact times, initial U(VI) concentrations, temperatures and co-existing ions on the U(VI) adsorption properties of PCCP and PCCP-AO were studied. Data showed that PCCP and PCCP-AO exhibited high U(VI) adsorption capacities of 293.2 mg g −1 and 319.1 mg g −1 respectively. PCCP-AO has a higher adsorption capacity, a faster adsorption rate and a better U(VI) selectivity than PCCP. Besides, PCCP-AO exhibited good reusability.
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
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yindian Wang,Dong Chen,Guan Wang,Changwen Zhao,Yuhong Ma,Wantai Yang
A facile strategy to immobilize cellulase was developed in this work. Firstly, crosslinked styrene and maleic anhydride copolymer nanoparticles (SMN) were conveniently synthesized as carrier by self-stable precipitation polymerization in the absence of any stabilizer. Benefit from the high reactivity of anhydride groups, the cellulase was then covalently bound to SMN at mild condition. The optimum loading amount of cellulase on SMN was determined to be 167 mg/g. Although the immobilized cellulase showed almost no change of activity at temperature from 30 °C to 80 °C compared to free cellulase, its pH stability was significantly improved. After immobilization, the optimum pH shifted to 5.0 and immobilized cellulase could retain 80% activity at pH 8.0, which was much higher than that of free enzyme (14%). Furthermore, the immobilized cellulase showed excellent reusability in catalytic hydrolysis of carboxymethylcellulose sodium salt, preserving almost 100% activity after recycling 6 times and loss only 20% activity after 10 cycles. The results suggest that SMN is a promising carrier for enzyme immobilization.
研究领域:
生物化学
·
材料科学
·
酶工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Biru Shi,Yinglu Sun,Xinxin Tian,Jiahui Zhong,Zhenyu Zhang,Xiangdong Liu,Dekun Sheng,Yuming Yang,Wenhua Zhang
Adhesives are widely used to bond various materials and surfaces, hot melt adhesives (HMAs) have conquered almost every industry area due to their solvent-free volatilization and ease of use. However, preparing reusable HMAs with high shear strength is still extremely challenging. Here, we show a simple way to prepare a reusable HMA, OPU (oxime-based polyurethane), with high lap shear strength based on oxime-urethane bonds. Cu(II) ions were introduced to further enhance the bulk strength to form ligand bonds. The relationship between the ligand bond content and the material properties was also investigated. Increasing ligand bond content limited the degree of crystallinity and shear strength. And the breaking stress and toughness of the coordinated material were significantly increased. The initial shear strengths of OPU for 304 stainless steel (after this referred to as “steel”) and aluminum reached 12.6 MPa and 9.3 MPa, respectively, which is the highest shear strength available for oxime-urethane-based polyurethane HMAs. After 10 repetitions, the OPU still retains its high shear performance. By analyzing the relationship between shear strength and the amount of Cu(II), it is found that the shear strength is strongly related to chain mobility and Young's modulus . This work demonstrates a useful way of synthesizing reusable HMAs with high lap shear strength.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Ruizhi Tang,Lei Pan,Quan Bai,Cong Li,Shujuan Ma,Junjie Ou,Yehua Shen
High-performance reusable materials from renewable resources are rare and urgently required in bioseparation. Herein, a series of tannic acid-chitosan composite membranes for the enrichment of phosphopeptides were fabricated by the freeze casting method. First, a tannic acid-chitosan composite membrane was acquired via the multiple hydrogen bonds between tannic acid and chitosan, which had a long-range aligned three-dimensional microstructure. Second, a covalent–hydrogen bond hybrid composite was also fabricated, with stable and aligned honeycomb-like microstructures that formed by the synergy of covalence and hydrogen bonding. Besides, a ternary composite membrane was “one-pot” synthesized by the copolymerization of tannic acid, chitosan, and Ti4+ ions, indicating the feasibility of involving metal ions in the composition of the polymer skeleton in place of additional modification steps. The as-prepared chitosan composite membranes exhibited excellent performance in the enrichment of phosphopeptides from β-casein tryptic digest and human serum. Benefitting from the long-range aligned honeycomb-like structure coordinated by hydrogen bonds and covalent bonds, and a large number of pyrogallol functional groups provided by tannic acid, the covalent–hydrogen bond hybrid membrane showed excellent reusability and could be reused up to 16 times in phosphopeptide enrichment, as far as we know, which is the best reported result to date.
研究领域:
生物分离
·
材料科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 42
·期 3
·1665-1672
·
IF 3.269
Lin Tan,Zhaojun Tan,Huixia Feng,Jianhui Qiu
Herein, a new strategy was developed to fabricate an oriented cellulase/chitosan/Fe3O4 composite, which possesses extremely high activity, reusability, and stability. Compared to the conventional methods, herein, cellulase was first mixed with cellulose; this allowed the active-centers of cellulase to combine with cellulose tightly. Then, the cellulase/cellulose mixture was immediately embedded into chitosan (CS) layers, which were coated with Fe3O4 nanoparticles. After hydrolyzing the cellulose, a flexible hollow structure was obtained. The activity of immobilized cellulase was still maintained over 50% even after 15 uses; this indicated that the composite we fabricated herein possessed much higher activity and reusability as compared to those reported in other studies. The promising stability and activity of the immobilized cellulase is very important for practical applications.
研究领域:
生物技术
·
材料科学
·
酶工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yutao Xu,Youhui Chen,Ayoub EL Idrissi,Banlian Ruan,Longfei Ma,Teng Long,Yufan Liu,Hong Jiang,Lingbin Lu
Conventional materials for lithium-ion extraction often suffer from significant dissolution loss, the limitation of active sites, low separation efficiency, potential toxicological risks and environmental concerns. To tackle these issues and develop next-generation adsorbent, an innovative adsorbent is designed for delivering superior performance while prioritizing environmental sustainability for lithium-ion extraction in water. Remarkably, inspired by the Möbius strip, this work proposes an ingenious “opening and re-ring” strategy for expanding alginate sugar ring to crown ether ring through an oxidation and an acetal reaction with the ion template imprinting technology. This innovative process results in the development of a novel environmental-friendly and efficient Li + adsorption material. The crown-rich ether alginate aerogel showcases an ultra-high adsorption capacity up to 256.91 mg g −1 for Li + with excellent reusability and selectivity. More importantly, a proposed simple post-processing method is also beneficial for its repurposing application. Adsorption kinetics and thermodynamics reveal that the adsorption behavior is a complex mechanism involving both physical and chemical adsorption. The successful preparation of the novel adsorbent from renewable polysaccharide polymer with outstanding adsorption performances underscores the highly efficiency and sustainability. This study offers a valuable insights and new methodologies for designing efficient crown ether-based adsorbents for lithium ions from water.
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）