MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Fan Huang,Qiang Li,Gengsheng Ji,Jie Tu,Na Ding,Qianqian Qu,Guanhui Liu
To achieve cheap and highly efficient separation of oil/water mixtures, a superhydrophobic ployvinylidene fluoride (PVDF) and microcrystalline cellulose (MCC) composite membrane was prepared by a two-step method, in which MCC and PVDF were directly mixed to form the membrane at 25 °C, then lauric acid was induced on surface of the membrane using grafting method. Then membranes were characterized using field emission scanning electron microscope (SEM) Attenuated total reflection infrared spectra (FTIR-ATR). Thermogravimetric analysis (TGA), water contact angle (WCA). The water contact angle of the superhydrophobic membrane in air is 153° ± 2° and the separation efficiency for different immiscible oil/water mixtures is above 99%. The superhydrophobic membrane (119.6 mg/g loading amount of lauric acid) has a high flux of 8800 L m −2 h −1 for n-hexane-water mixture and stable separation performance to kerosene-water mixture, which can be reused 20 times without decreasing the separation efficiency. Meanwhile, surfactant-stabilized emulsions can be effectively separated using the superhydrophobic membrane under gravity. Besides, the superhydrophobic film can be degraded in soil.
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Hai Yan,Bingqiao Yang,Huanyu Zhu,Pengliang Huang,Yangjia Hu
A small non-toxic compound dithiothreitol (DTT) was introduced as an environmental-friendly chalcopyrite depressant in Cu-Mo flotation separation. The separation performances were studied via flotation tests. The adsorption mechanism was explored by contact angle, Zeta potential and X-ray photoelectron spectroscopy (XPS) measurements. The flotation results manifested that DTT exhibited strong depression ability on chalcopyrite, but barely influenced the floatability of molybdenite. The contact angle and Zeta potential measurements indicated that DTT mainly adsorbed on chalcopyrite and rendered its surface hydrophilic, while it hardly adsorbed on molybdenite. XPS analysis confirmed that DTT might complex with Cu atoms on chalcopyrite surfaces via the thiol groups. This study demonstrated that DTT was a promising alternative for Na 2 S in Cu-Mo separation, which was more effective and environmentally compatible.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ruibing Bai,Junfeng Wang,Daoguang Wang,Yanqiang Zhang,Junjie Cui
The high acidity of stripping is one of the major problems that hinder the industrialization of the tributyl phosphate (TBP) + FeCl 3 system for lithium extraction from the salt lake brines with high Mg/Li ratio. In this study, a novel solvent extraction system, trialkylmethylammonium di(2-ethylhexyl)orthophosphinate ([N 1888 ][P 507 ]) + TBP + FeCl 3 , was developed to significantly reduce the difficulty of stripping and simplify the extraction process. The conditions of extraction and stripping were systematically studied in the present work. The results showed that Li + extraction efficiency could reach 61% under the optimal extraction parameters and Li + stripping ratio was 90% with a relative mild conditions of O/A = 10:1, [HCl] aq = 1.5 mol·L –1 . Also, combined with experimental results, FT-IR analysis, and UV analysis, the possible mechanisms of lithium extraction and stripping were put forward. Li + was extracted from the aqueous phase through the formation of [Li·2TBP][FeCl 4 ] adduct, meanwhile [N 1888 ][P 507 ] was just slightly involved in the extraction step. In the stripping procedure, the interaction between [FeCl 4 ] − and [Li·2TBP] + might be destroyed, and new possible complexes, [Li·2TBP] + , and [FeCl 4 ·TBP·P 507 ] 2− /[FeCl 4 ·P 507 ] 2− were formed in the organic phase. Additionally, the extraction efficiency of Li + remained above 70% while the organic phase was reused for six cycles. Compared with the traditional system, the addition of [N 1888 ][P 507 ] resulted in a slight decrease of Li + extraction efficiency (about 5%), the stripping acidity significantly reduced from 6 mol·L –1 HCl to 1.5 mol·L –1 HCl. This new extraction system showed a promising performance in selective extracting and easy stripping in lithium separation from the salt lake brines with high Mg/Li ratio.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Xiaojiang Liang,Fengjiao Wu,Qinglong Xie,Zhenyu Wu,Jinjin Cai,Congwen Zheng,Junhong Fu,Yong Nie
Biodiesel was used to prepare epoxidized fatty acid isobutyl esters (Ep-FABEs) as a biobased plasticizer in this work. Transesterification of biodiesel with isobutanol catalyzed by tetrabutyl titanate was carried out in a gas-liquid tower reactor. The conversion achieved nearly 100% within 5 h under the reaction temperature, the mass ratio of catalyst to fatty acid methyl esters (FAMEs), and isobutanol to FAMEs total molar ratio of 180 °C, 0.4 %(mass), and 5.4:1, respectively. In addition, kinetic model of the transesterification reaction was developed at 150–190 °C. The calculated activation energy was 48.93 kJ·mol −1 . Then, the epoxidation of obtained fatty acid isobutyl esters (FABEs) was conducted in the presence of formic acid and hydrogen peroxide. The Ep-FABEs was further analyzed for its plasticizing effectiveness to replace dioctyl phthalate (DOP) and compared with conventional epoxy plasticizer epoxidized fatty acid methyl esters (Ep-FAMEs). The results indicated that the thermal stability and mechanical properties of PVC films with Ep-FABEs plasticizer were significantly improved compared with those plasticized with DOP. In addition, the extraction resistance and migration stability of Ep-FABEs were better than those of Ep-FAMEs. Overall, the prepared Ep-FABEs via structural modification of biodiesel proved to be a promising biobased plasticizer.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 19
·50391
·
IF 2.52
Liqiang Yi,Shuoshuo Wang,Lina Wang,Juming Yao,Jaromir Marek,Ming Zhang
In this work, a waterproof and breathable nanofibrous membrane with thermal-regulated performance and exhibits excellent mechanical property is fabricated by coaxial electrospinning. The fiber shell is consisted of polyvinylidene fluoride (PVDF) and polyvinyl butyral (PVB), and the core is octadecane. First, well-performed waterproof and breathable membranes are obtained by optimizing its morphology and pore structure. Then octadecane is loaded into the fibers in the form of core by coaxial electrospinning, though it gives the membranes a thermal regulating function, but the drawback is the sacrifice of overall properties. Thus, carbon nanotubes are loaded into the shell and studied, finally, the best membrane has a comprehensive performance with hydrostatic pressure of 59.2 kPa, water vapor transmission rate (WVTR) of 7.846 kg m −2 d −1 , latent heat of 50.1 J g −1 , as well as excellent tensile strength of 20.2 MPa, which shows its certain reference significance to the synthesis of multifunctional membrane.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Mingyang Zhou,Junchao Chen,Wenjin Zhou,Juan Sun,Hongyan Tang
Membrane fouling is still an inevitable main challenge to nanofiltration (NF) process, which leads to a decline in membrane performance. Inspired by fish scales, a facile method was performed to develop composite NF membranes with highly stable antifouling property based on hydrophilic roughness. γ-(2,3-glycidyloxy) trimethoxysilane (KH560) grafted onto PEI molecules during interfacial polymerization on hydrophilic microporous PTFE support. Finally, tetraethyl orthosilicate (TEOS) reacted with KH560 molecules. Results of fourier transform infrared (FTIR) spectra, FESEM and contact angle measurements indicated that micro/nano hydrophilic SiO 2 spheres engendered on the membrane surface. Evaluation of membrane antifouling property showed that flux recovery ratio (FRR) of BSA, HA, SDS and Oil/water mixture for the as-prepared NF membranes were 96.0%, 95.8%, 96.8% and 95.0%, respectively. No obvious permeate flux decline and rejection fluctuation could be observed in filtration experiment of MgSO 4 aqueous solution on long-term run (100 h). It indicated highly stable antifouling property, which may be due to hydrophilic microscale/nanoscale SiO 2 spheres grafted onto the skin layer of the as-prepared NF membranes through chemical linkage. It is expected that these findings could provide more insight for fabrication and simultaneous modification of NF membranes.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION
·
2020
·
IF 2.245
Menglei Zhang,Hao Song,Chenghang Zheng,Zhenglong Lin,Yi Liu,Weihong Wu,Xiang Gao
Disposal of spent catalyst in an economical and green way has become a great concern for industrial production. We developed a process including acid leaching, solvent extraction and stripping in order to recycle spent catalyst. In this study, we conducted selective recovery of molybdenum through focus on finding an optimized extraction and stripping process by comparing different extractants and stripping agents. To separate molybdenum from other metals efficiently and figure out the mechanism of extraction process, the five different extractants of methyl trioctyl ammonium chloride, tri-n-octylamine, tris (2-ethylhexyl) amine, bis (2-ethylhexyl) phosphate, and tributyl phosphate with different functional groups were examined; the extraction ability and extraction mechanism of these five extractants were systematically studied under the same system for the first time. It was found that more than 98% of the molybdenum could be extracted with an organic phase consisting of tri-n-octylamine or methyl trioctyl ammonium chloride under the optimal conditions. The result indicated that the tri-n-octylamine and methyl trioctyl ammonium chloride possess excellent molybdenum extraction ability, the extraction capacity of the rest extractants was in the order of bis (2-ethylhexyl) phosphate > tris (2-ethylhexyl) amine > tributyl phosphate. In the stripping process, NH4OH, NaOH, and H2SO4 were chosen as stripping agent to strip the molybdenum from the loaded tri-n-octylamine organic phase. The stripping ability of the three studied stripping agents was in the order NaOH > NH4OH > H2SO4. The Fourier transform infrared (FTIR) spectra showed that the structure of the tri-n-octylamine organic phase was stable during the extraction and stripping process. Results showed that molybdenum could be highly and efficiently recovered by optimized extraction and stripping process.Implications: A series of different extractants and stripping agent have been systematically studied in order to compare their extraction and stripping ability under the same system. Based on the obtained results, an optimized extraction and stripping process was proposed to recycle molybdenum from spent catalyst efficiently. It is possible to dispose spent catalysts in an economic and environmental way by this developed metal recovery process.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2021
·Vol. 24
·期 2
·199-208
·
IF 1.902
Yun Bai,Chunsheng Pu,Shuai Liu,Xiang Gao,Gang Chen
The purpose of this paper is to comprehend in-depth the effect of the surfactant structure on its and physicochemical properties such as surface/interfacial properties, foam stability, wettability, and biodegradability. To this end, quaternary ammonium Gemini surfactants, alkanediyl-α,ω-bis[(2-hydroxypropyl)dodecylammonium] dibromide (abbreviated as C m -n-C m [iso-Pr(OH)] 2 with m = 12, 14 and n = 2, 3, 4) were synthesized via substitution and quaternization reactions, and their chemical structures were characterized by Fourier transform infrared (FT-IR) and nuclear magnetic resonance ( 1 HNMR) spectroscopies. The results showed that with the decrease of the spacer length, the surface tension was reduced more strongly, and with the increase of the alkyl tail length, micelles were more easily formed. Besides, the highest surface activity of C 14 -2-C 14 [iso-Pr(OH)] 2 was observed by increasing NaCl concentration to 200 g L −1 . The temperature had a great influence on thermodynamic parameters of the adsorption and micellization. The interfacial tension between 0.26 g L −1 C 14 -2-C 14 [iso-Pr(OH)] 2 solution and oil could reach 0.022 mN m −1 . An elongation of the spacer chain in C 14 -n-C 14 [iso-Pr(OH)] 2 was unfavorable to foam stability. Besides, the oil-wetted core, which was aged in 0.6 g L −1 C 14 -2-C 14 [iso-Pr(OH)] 2 solution, exhibited more hydrophilicity. C m -n-C m [iso-Pr(OH)] 2 surfactants produced higher biodegradable rates in river water (≥ 90% after 28 days) than the biodegradable surfactant of international recommendation (71% after 28 days) at 30 °C.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 7
·4167-4175
·
IF 12.732
Haoyu Li,Peng Mu,Jian Li,Qingtao Wang
Purification of highly emulsified oily wastewater is of significance but challenging due to the critical limitations of low efficiency and serious membrane blocking. Herein, inspired by the desert beetle's capability of water-collection in air, we first constructed an inverse desert beetle-like membrane to achieve oil capture in water, thus improving the separation performances of the surfactant-stabilized oil-in-water emulsion. The as-prepared nanofibrous membrane consists of hydrophobic/oleophilic ZIF-8 bumps and underlying underwater superoleophobic polyacrylonitrile (PAN), and possesses a similar structure to desert beetles but with opposite wettability. In the process of emulsion demulsification, besides the sieving effect of the underlying traditional underwater superoleophobic PAN membrane, the bumpy oleophilic ZIF-8 particles of the composite membrane can capture oil, thus strengthening the demulsification ability of the membrane. Furthermore, the separation efficiency of the inverse desert beetle-like membrane is up to 99.92% for surfactant-stabilized oil-in-water emulsion, which is superior to that of traditional single underwater superoleophobic PAN membranes lacking the hydrophobic bump structure. Moreover, for light oil-in-water emulsion, the permeation flux also increases because the captured tiny oil droplets can aggregate subsequently and grow large enough to detach from the underlying surface which greatly reduces the incidence of filter cake formation and congestion. This inverse desert beetle-like membrane opens up new avenues for designing advanced membranes in the oil/water emulsion separation field.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 20
·50461
·
IF 3.125
Zichao Yin,Wei Liu,Mutai Bao,Yang Li
Most ingredients used to construct porous substrate of hydrophobic magnetic absorbent for oil/water separation are toxic, environmentally incompatible and difficult to degrade. With the purpose of solving this problem, a magnetic chitosan (CS)-based aerogel decorated with polydimethylsiloxane (PDMS) was successfully fabricated in this work. The magnetic porous substrate was built by the electrostatic interactions between CS, itaconic acid and Fe 3 O 4 nanoparticles (FeNPs) in water solution, followed by a freeze-drying process. The hydrophobic properties were rendered to the substrate by the crosslinking reaction of PDMS. Owing to the low density (0.0655 g/cm 3 ) and high porosity (92%), the prepared aerogel displayed high absorption capacities (8.89–22.38 g/g) towards the testing organic liquids. The silylation process provided the aerogel with excellent hydrophobic properties (water contact angle, 147.1°), resulting in selectively absorbing oil from immiscible oil/water mixture and water-in-oil emulsion. Due to the uniformly distributed FeNPs, the remote control of the aerogel by external magnetic field was acquired, the saturation magnetization of which was 11.22 emu/g. Furthermore, the aerogel could also continuously separate heavy oil from water by acting as filter. The experimental results indicate that this renewable, environmentally benign and bifunctional aerogel has great potential in oily wastewater remediation.
✓ 已验证
产品关联
DOI
高影响因子
SN Applied Sciences
·
2021
·Vol. 3
·期 1
·1-8
·
IF 0
Xu Weikang,Zhang Zhentao,Cai Xiaomei,Hong Yazhen,Lin Tianliang,Lei Tingping
Effective treatment of frequent oil spills and endless discharged oily wastewater is crucial for the ecosystem and human health. In the past two decades, the collection of oil from water surface has been widely studied through the simple fabrication of superhydrophobic meshes with various coating materials, but little attention is paid to the design aspects of the meshes based oil-collecting device and practical oil collection. Here, 3D-printing devices with different configurations of (super)hydrophobic meshes, circular truncated cone (CTC), cylinder and inverted CTC, and the same inverted cone-shaped structure (below the meshes for temporary oil storage) are investigated. Results demonstrate that the CTC meshes based device especially for an oblate one not only shows higher stability and discharge of the collected oils than previous reports, but also allows floating oils to enter the (super)hydrophobic mesh faster. We anticipate that future success in developing high-performance (super)hydrophobic meshes and the further optimization of the CTC mesh-based device parameters will make our proposed device more practical for the treatment of real-life oil spills.
✓ 已验证
产品关联
DOI
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Wanying Zhou,Huiting Liang,He Xu
In recent years, waste mobile phones have become popular as electronic waste due to the huge amount, serious pollution with improper disposal and high resource value. It is imperative to realize the recycling of resources in waste mobile phones. The application of emulsion liquid membrane in the recovery of gold and synthesis of nanomaterials from waste mobile phone printed circuit boards (WMPCBs) was studied. The components of the emulsion liquid membrane, effects of 7 factors on the extraction rate and the morphology of the synthesized nanomaterials were explored. The results show that it is possible to extract 99.79% of Au(III) from WMPCBs leachate with kerosene as diluent, Span80 as surfactant, methyl isobutyl ketone(MIBK) as carrier, ascorbic acid solution as stripping agent and liquid paraffin as membrane stabilizer. The external phase pH and the internal phase concentration had a greater influence on the extraction efficiency of Au(III) among 7 factors. The morphology of the synthesized product was affected by the concentration and type of the surfactant. It provides a new idea to connect recovery from waste with deep processing, extending the waste mobile phone recycling process chain and achieving high-value utilization of waste mobile phone secondary metal resource products.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）