Polymers
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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
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环境科学
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DOI
PubMed
高影响因子
Polymers
·
2018
·Vol. 10
·期 2
·159
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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
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环境科学
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PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 328
·期 3
·1161-1172
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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
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环境科学
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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
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材料科学
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酶工程
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2017
·Vol. 42
·期 3
·1665-1672
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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
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材料科学
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酶工程
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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
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环境科学
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高影响因子
MOLECULES
·
2024
·Vol. 29
·期 17
·4195
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IF 4.2
Yu Wang,Zhimin Yang,Xichang Wu,Wenxuan Quan,Qi Chen,Anping Wang
In the present study, an acid catalyst (UiO-66-SO3H) with Brønsted and Lewis acid sites was synthesised for the preparation of highly efficient biodiesel from oleic acid and methanol using chlorosulphonic acid sulfonated metal–organic frameworks (UiO-66) prepared with acetic acid as a moderator. The prepared catalysts were characterised using XRD, SEM, FT-IR and BET. The catalytic efficiency of the sulfonated catalysts was significantly improved and successful sulfonation was demonstrated by characterisation techniques. Biodiesel was synthesised by the one-pot method and an 85.0% biodiesel yield was achieved under optimum conditions of the reaction. The esterification reaction was determined to be consistent with a proposed primary reaction and the kinetics of the reaction was investigated. A reusability study of the catalyst (UiO-66-SO3H) was also carried out with good reproducibility. In conclusion, the present study provides some ideas for the synthesis of catalysts with high catalytic activity for the application in the catalytic preparation of biodiesel.
研究领域:
化学工程
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催化科学
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DOI
PubMed
高影响因子
RSC Advances
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2020
·Vol. 10
·期 71
·43425-43431
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IF 3.119
Junwen Li,Haiming Cheng
Molecular sieve 5A was modified with (3-aminopropyl) triethoxysilane (APTES) as the support matrix, on which 4-VP was used as the ionic imprinting group. The as-prepared IIZMS-APTES was applied as the adsorbent for the recovery of chromium(VI) from aqueous solutions. The adsorbent was characterized via Fourier transform infrared spectroscopy (FT-IR), scanning electronic microscopy (SEM), and X-ray diffraction (XRD). The influences of adsorption time, concentration of the ions, initial pH, and temperature on the adsorption performance to Cr(VI) were investigated. The selectivity and reusability of IIZMS-APTES are also evaluated. The results showed that the maximum adsorption capacity reached 56.46 mg g−1 when the initial concentration of metal ions was at 100 mg L−1 at pH 2 and 30 °C. The adsorption process followed the pseudo-second-order kinetic model and Langmuir adsorption isotherm model. The IIZMS-APTES exhibits an efficient selective adsorption of Cr(VI) from aqueous solutions.
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 33
·15959-15966
·
IF 3.925
Kai Zong,Ke Li,Ziyue Zhou,Lei Gong,Dongshun Deng
The uptake of NH3 in the industrial tail gas will improve the environmental quality for human health and ecology. Adsorption separation has the advantages of simple operation and low energy consumption. However, the relatively low adsorption capacity severely hinders its practical utilization. In this work, four glycerol-based deep eutectic solvents (DESs) were incorporated into porous silica gels (SGs) and Al2O3 with a large surface area and pore structure to form novel DES/SG and DES/Al2O3 composites. The obtained materials were systematically characterized by FTIR, SEM, BET, and TGA and further evaluated for NH3 adsorption. The results showed that the acidic GuSCN:Gly DES played an indispensable role for the high adsorption ability of the composite. 40 wt% GuSCN : Gly (1 : 3) DES/SG can capture 115.40 mg NH3 per gram adsorbent, which is better than most of the solid adsorption materials reported in the literature and even 30% higher than the original SG. The high adsorption capacity, outstanding thermal stability, and good reusability confirm the success of the present strategy. This study will provide a useful idea for designing DES-supported composites for NH3 separation applications.
研究领域:
环境科学
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材料科学
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhongsen Yan,Sufen Lin,Haiqing Chang,Junge Xu,Wenxin Dai,Dan Qu,Heng Liang,Fangshu Qu
Membrane distillation technology, utilized for treating hypersaline wastewater from seawater desalination, often encounters challenges related to inorganic scaling, adversely affecting membrane performance. Herein, we introduce a innovative approach employing a sacrificial layer on the surface of Thin Film Composite (TFC) membranes to concurrently enhance inorganic scaling resistance and facilitate membrane reusability. The sacrificial layer (Fe 3+ -TA) consisted of tannic acid (TA) complexed with iron ions (Fe 3+ ) and could be removed and regenerated in situ. The results demonstrated that the Fe 3+ -TA layer significantly improved the membrane's surface smoothness and densification, maintaining superior anti-scaling performance. The modified membrane exhibited remarkable durability, sustaining six reuse cycles with a flux recovery exceeding 97 % in gypsum scaling tests. Furthermore, the formation of new complexes during gypsum scaling tests confirmed the membrane's augmented scaling retardation capabilities. Thus, integrating of a sacrificial layer into TFC membranes presents a promising strategy for advancing membrane distillation processes in hypersaline wastewater treatment.
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
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Songhao Yu,Guifen Tian,Liduan Li,Fei Wang,Kefeng Wang,Junyu Lei,Haijun Hao,Qinghong Xu
TpFO-PA, a novel spherical hollow mesoporous polyamide, was firstly synthesized by the reaction among 1,3,5-tris(4-aminophenyl)benzene (TAPB), furylamine and oxalyl chloride in using silica-gel nanoparticle as hard template, and the composite Cu(I)@TpFO-PA with high catalytic activities in C-N coupling reactions between (hetero)aryl bromide and (hetero)aryl amines under mild conditions was prepared basing on presence of N in the framework. A maximum activity of the catalyst with yield of C-N coupling product were about 311.9 g (product) /mol Cu(I) ·h and 95 % respectively, and the activity could be maintained at least 5 times after the catalyst was reused. The composite Cu(I)@TpFO-PA is a few heterogeneous catalysts reported in catalyzing coupling reaction between aromatic amines and brominated aromatic compounds.
研究领域:
化学
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材料科学
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DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Yi Tan,Kaili Wang,Qian Yan,Shifeng Zhang,Jianzhang Li,Yong Ji
An innovative wood flour-based adsorbent for Pb(II) removal was synthesized via a cost-effective and environment-friendly method, which could be high on the priority list owing to its high absorption capacity. By increasing the specific surface and introducing functional groups through delignification and amination, the experimental adsorption capacity of the prepared adsorbent could reach 189.9 mg/g in 180 min (pH = 4, T = 293 K, dosage = 1 g/L, and ion concentration = 300 mg/L). This value is higher than most of those achieved in previous studies on wood-based adsorbents. Pseudo-second-order and Langmuir models were utilized to describe the adsorption kinetics and isotherms, respectively. The effects of solution pH, adsorbent dosage, and temperature on the adsorption efficiency were also evaluated. With a low decrease rate of 20.2% in five cycles, the adsorbent possessed reusability. The adsorbents exhibited high selectivity in the Pb(II), Cu(II), and Zn(II) mixed solution, and the selectivity coefficient k of adsorbents to Pb(II) could reach approximately 2.74 in triad. The method could prompt the development of cost-effective methods for the removal of heavy metals from wastewater.
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
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