CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Zhi-Hui Huang,Zhi-Yong Ji,Ying-Ying Zhao,Jie Liu,Fei Li,Shi-Zhao Wang,Jun-Sheng Yuan
An easily obtainable and cheap activator was obtained with natural clinoptilolite, which was easy to be modified with a ferrous sulfate solution. The modification can greatly improve the Fe/C ratio of the zeolite surface without changing the typical porous structure of natural clinoptilolite. The modified zeolite can activate sodium persulfate to degrade 2-methoxyphenol (MOP, a typical organic contaminant in salty wastewater), and has a heterogeneous-homogeneous synergistic effect accompanying heat. The mechanism investigation shows the activation of single modified zeolite is more complex at normal temperature (25 °C), and many types of free radicals are involved in the degradation through multiple pathways. Rapid degradation of MOP can be achieved with the synergistic effect of the modified clinoptilolite + heat, and the degradation ratio reaches 95.0% in 10 min caused by the generation of more sulfate- and superoxide radicals. Comparing with the effect of the directly activated persulfate process by ferrous sulfate, a better degradation effect could be obtained with active substance slowly released by the modified zeolite. And adding thermal activation can further increase the activation rate and utilization of oxidants. Finally, better mineralization efficiency achieves, and the total organic carbon (TOC) removal ratio with synergistic activation is about 5 times that of a single activation by modified zeolite within 20 min. In addition, the activator shows good activated performance in three consecutive cycles. The MOP degradation ratio using M80-zeolite, reducing by 21.8% at 10 min in the third use, could be recovered to 95.0% with the original modified method.
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APPLIED ENERGY
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2020
·
IF 8.848
J. Yan,Z.H. Pan,C.Y. Zhao
Thermochemical heat storage uses a reversible chemical reaction to store thermal energy. This thermal energy storage method has high energy density and allows long-term thermal energy storage. MgO/Mg(OH) 2 is a promising reversible reaction for thermochemical heat storage systems. The performance of this reversible reaction inside a reactor plays a key role in its practical applications. The direct type heat transfer reactor is a novel design compared with an indirect powder bed reactor. It allows the gaseous heat transfer fluid to flow through the powder in order to break the heat transfer limitation from the heat exchanger between the MgO/Mg(OH) 2 powder and the heat transfer fluid. In this study, we evaluated the performance of a direct type MgO/Mg(OH) 2 reactor under various operating conditions. Parametric analyses indicated that the heat output is limited by the reaction rate rather than the heat transfer efficiency. Results also showed the best bed thickness in order to achieve the highest temperature output. Material characterization indicated that the MgO/Mg(OH) 2 particles did not agglomerate with each other after 15 heat charging and discharging cycles.
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Science Bulletin
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2020
·
IF 9.511
Weiwei Zhao,Tiantian Chen,Weikang Wang,Beibei Jin,Jiali Peng,Shuaihang Bi,Mengyue Jiang,Shujuan Liu,Qiang Zhao,Wei Huang
The flexible transparent supercapacitors have been considered as one of the key energy-storage components to power the smart portable electronic devices. However, it is still a challenge to explore flexible transparent capacitive electrodes with high rate capability. Herein, conductive Ni 3 (HITP) 2 (HITP = 2,3,6,7,10,11-hexaiminotriphenylene) thin films are adopted as capacitive electrodes in flexible transparent supercapacitors. The Ni 3 (HITP) 2 electrode possesses the excellent optoelectronic property with optical transmittance ( T ) of 78.4% and sheet resistance ( R s ) of 51.3 Ω sq –1 , remarkable areal capacitance ( C A ) of 1.63 mF cm −2 and highest scan rate up to 5000 mV s −1 . The asymmetric Ni 3 (HITP) 2 //PEDOT:PSS supercapacitor ( T = 61%) yields a high C A of 1.06 mF cm −2 at 3 μA cm −2 , which maintains 77.4% as the current density increases by 50 folds. The remarkable rate capability is ascribed to the collaborative advantages of low diffusion resistance and high ion accessibility, resulting from the intrinsic conductivity, short oriented pores and large specific areas of Ni 3 (HITP) 2 films.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Juan Lv,Sen Liu,Hao Ling,Hongxia Gao,Wilfred Olson,Qiang Li,Zain Ali Saleh Bairq,Zhiwu Liang
A new sulfolane/secondary amine biphasic absorbent, sulfolane/2-methylaminoethanol (MAE) solution, was developed for postcombustion CO2 capture (PCC). Surprisingly, using a 4M/5M sulfolane/MAE solution saves about 60% energy consumption (EC) for CO2 stripping when compared with traditional aqueous 5M monoethanolamine (MEA) solutions. First, we theoretically proved that MAE in sulfolane-based biphasic solution improves the CO2 absorption rate with high CO2 loading at the phase-changing point, which could be energy-saving for CO2 stripping. Based on a comprehensive comparison of the phase-changing behavior, nuclear magnetic resonance (NMR) spectra, absorption rate, and desorption performance, the 4M/5M sulfolane/MAE was determined to be the optimal molar ratio among six sulfolane/MAE biphasic solutions for CO2 capture. In addition, the absorption and desorption experiments with various temperatures revealed that relatively low temperature (ranging from 110 to 120 °C) was favorable for CO2 removal and energy-saving. Furthermore, the 4M/5M sulfolane/MAE solution achieved a very low energy consumption (EC) compared with that of 5M MEA solution, and the stripped CO2 amount is similar to that of 5M MEA and 5M MAE solutions.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2019
·Vol. 19
·期 11
·7178-7184
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IF 1.093
Xing Xuteng,Wang Jihui,Li Qiushi,Hu Wenbin
Halloysite nanotubes (HNTs) are natural clay minerals with a tubular structure. They have attracted considerable attention as a potential nanocontainer due to their abundance, biocompatibility and nontoxicity. In this study, HNTs were handled with H2SO4 at 70 °C.
The morphology and structure of these acid-treated and original HNTs were investigated by scanning electron microscopy (SEM), energy dispersion spectrum (EDS), transmission electron microscope (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), and their specific
surface area was determined by automatic gas adsorption analyzer. The loading efficiency and release behavior of acid-treated HNTs for 2-Mercaptobenzothiazole (MBT) were investigated by UV-vis spectrophotometer. Results show that acid-treated HNTs retained their tubular structure, but their
internal diameter expanded by 35–37 nm after 32 h of acid treatment. After 72 h of acid treatment, HNTs can be transferred into amorphous silica nanotubes. Moreover, the specific surface area of these HNTs samples initially increased with the increase in acid treatment time but then
started to decrease after 32 h. The specific surface area of acid-treated HNTs at 32 h can reach 251.6 m2/g, which was much higher than that for untreated HNTs (55.3 m2/g). In addition, the loading capacity of acid-treated HNTs can reach 32.1% for HNTs-32, which is about
three times higher than that of original HNTs. The acid treatment has slight effect on the release behavior.
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BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Zhe Lu,Jingcheng Dai,LingLing Zheng,Zhuoran Teng,Qi Zhang,Dongru Qiu,Lirong Song
Improving carbon availability in astaxanthin production is pivotal in Haematococcus industry. In this study, disodium 2-oxoglutarate (2-OG-2Na) was observed to be a potential carbon regulator to increase the astaxanthin content. To illustrate its efficacy in astaxanthin production, key genes and enzyme were analyzed. Upon 2-OG-2Na treatment, genes ipi , bkt and crtR-b were up regulated, concomitantly, carotenoids and astaxanthin content increased by 15.4% and 14.0% at 120 h, respectively; additionally, Acetyl-CoA carboxylase was activated, consistent with 1.27-fold increase in fatty acids content. PUFAs increased earlier as fatty acids assembly gene fad was up-regulated to 20.56. It was also found that cell division was not compromised. Altogether, it was suggested that increased carbon skeletons were re-directed into the astaxanthin and fatty acids biosynthesis pathway. Furthermore, 2-OG-2Na was applied in ten Haematococcus strains. Of these strains, astaxanthin contents were accelerated with average net increase of 10.48%, exhibiting a scalable paradigm for commercial production.
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SENSORS
·
2019
·Vol. 19
·期 22
·5055
·
IF 3.031
Min Jiang,Peng Sun,Jie Zhao,Lihua Huo,Guofeng Cui
Flexible physiological medical devices have gradually spread to the lives of people, especially the elderly. Here, a flexible integrated sensor based on Au nanoparticle modified copper hydroxide nanograss arrays on flexible carbon fiber cloth ([email protected](OH)2/CFC) is fabricated by a facile electrochemical method. The sensor possesses ultrahigh sensitivity of 7.35 mA mM−1cm−2in the linear concentration range of 0.10 to 3.30 mM and an ultralow detection limit down to 26.97 nM. The fantastic sensing properties can be ascribed to the collective effect of the superior electrochemical catalytic activity of nanograss arrays with dramatically enhanced electrochemically active surface area as well as mass transfer ability when modified with Au and intimate contact between the active material ([email protected](OH)2) and current collector (CFC), concurrently supplying good conductivity for electron/ion transport during glucose biosensing. Furthermore, the device also exhibits excellent anti-interference and stability for glucose detection. Owing to the distinguished performances, the novel sensor shows extreme reliability for practical glucose testing in human serum and juice samples. Significantly, these unique properties and the soft structure of silk fabric can provide a promising structure design for a flexible micro-device and a great potential material candidate of electrochemical glucose sensor.Keywords:Cu(OH)2nanograss;Au nanoparticles;glucose detection;flexible electrochemical biosensor
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ChemElectroChem
·
2019
·Vol. 6
·期 20
·5313-5320
·
IF 3.975
Jingting Chen,Suqin Ci,Genxiang Wang,Nangan Senthilkumar,Mengtian Zhang,Qiuhua Xu,Zhenhai Wen
Graphical In nanotechnology we trust : A high-performance acid-alkali asymmetric-electrolyte electrolyzer (AAAE) was set up to implement energy-saving H 2 generation thanks to nanotechnology advances that enable us to develop self-supported electrodes with Ni(OH) 2 nanosheets for high-activity catalysis of urea oxidation. It is highly attractive to develop efficient water electrolysis route to implement hydrogen generation in a low-cost way, which while requires excess energy to surmount the activation barriers majorly limited by oxygen evolution reaction at anode side. Herein, we report an acid-alkali asymmetric-electrolyte electrolyzer (AAAE) that can achieve substantial energy saving for electrolysis hydrogen generation, thanks to the assistance of electrochemical neutralization energy (ENE) and urea oxidation reaction (UOR). To this end, free-standing Ni(OH) 2 nanosheets on carbon cloth (Ni(OH) 2 −NSs/CC) is fabricated as catalytic anode for alkaline UOR, which manifests impressively high catalytic activity with delivering 10 mA cm −2 at 1.32 V and long-term durability. The as-developed AAAE only requires an applied voltage of 0.66 V to release the electrolysis current of 10 mA cm −2 , yielding the H 2 Faraday efficiency close to 100 % along with H 2 production rate of 183.8 μmol h −1 .
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BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY
·
2019
·Vol. 67
·期 3
·343-353
·
IF 1.559
Hai-Feng Hu,Hai-Yan Zhou,Gao-Ping Cheng,Ya-Ping Xue,Yuan-Shan Wang,Yu-Guo Zheng
R -2-(4-hydroxyphenoxy)propionicacid (HPOPA) is a valuable intermediate for the synthesis of enantiomerically pure aryloxyphenoxypropionic acid herbicides. In this work, to improve the HPOPA biosynthesis by Beauveria bassiana ZJB16002 from the substrate R -2-phenoxypropionic acid (POPA), the original HPOPA producer B. bassiana ZJB16002 was subjected to physical mutagenesis with 137 Cs-γ irradiation and chemical mutagen N -methyl- N' -nitro- N -nitrasoguanidine (NTG) induced mutagenesis. The effects of different treatment doses of the mutagens on the lethal rate and positive mutation rate were investigated, and the results showed that the optimal 137 Cs-γirradiation dose and NTG concentration was 850 Gy and 500 µg/mL, respectively. Under these conditions, a mutant strain CCN-7 with the highest HPOPA production capacity was obtained through two rounds of 137 Cs-γ irradiation treatment followed by one round of NTG mutagenesis. At the substrate (POPA) concentration of 50 g/L, HPOPA titer of CCN-7 reached 36.88 g/L, which was 9.73-fold higher than the parental strain. The morphology of the wild-type and mutant strain was compared and the results might provide helpful information in exploration of the correlation of morphology and biochemical features of B. bassiana .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Chunyu Qiu,Fuxian Cai,Yuan Wang,Yijun Liu,Qingxiang Wang,Chuan Zhao
It is a highly desired yet challenging task to replace rare and expensive noble metal catalysts with inexpensive and earth-abundant metal ones in electrochemical sustainable chemistry field. Herein, the bimetallic zinc-cobalt layered double hydroxide nanosheets (ZnCo-LDH NS) have been facilely synthesized using 2-methylimidazole as a bifunctional alkali source (OH − ) and a morphological controlling reagent by the one-step room-temperature reaction. The mechanism study shows that the weak organic base of 2-methylimidazole-induced slow release of OH − in water/ethanol is the controlling factor for the formation of the LDH nanosheets. The ZnCo-LDH NS modified on glassy carbon electrode exhibited an overpotential of 385 mV at 10 mA cm −2 and a Tafel slope of 108 mV dec −1 in 1.0 M KOH for oxygen evolution reaction , outperforming the corresponding the monometal oxides of Zn-OH, Co-OH, the NaOH produced ZnCo-LDH microparticles , and even the benchmark catalyst of RuO 2 at high current density. Characterization experiments indicated that the outstanding electrocatalytic activity can be ascribed to the nanosheet-induced surface area effect, excellent electronic conductivity, and the coupling effect between Zn 2+ and Co 2+ in the material. This work offers a facile and environmental-friendly method for synthesising LDH nanosheets bearing enhanced oxygen evolution reaction activity.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yang Peng,Zhanwei Xu,Le Yu,Xucheng Li,Weiran Yang
The direct conversion of furfural (FUR) to 2-methyltetrahydrofuran (2-MTHF) was investigated over a trimetallic CuNiRe/Hβ catalyst. Under optimal reaction conditions at 240 °C under 3 MPa H 2 for 1 h, almost complete conversion of FUR and high-yield of 2-MTHF (81 %) was achieved. This is the highest yield reported for the direct conversion of FUR to 2-MTHF. HR-TEM demonstrated that the growth of Cu nanoparticles (NPs) on the surface of Hβ was inhibited after loading Ni or Re resulted in the smaller Cu particle size and better hydrogenation and hydrodeoxygenation activity. H 2 -TPR characterization exhibited that the reducibility of bimetallic and trimetallic catalysts was higher than that of monometallic catalysts·NH 3 -TPD explained that Hβ acid sites mainly contributed to FUR deoxygenation. The adsorption configurations of FUR, furfuryl alcohol (FOL) and 2-methylfuran (2-MF) on the catalyst were revealed by ATR-IR. Catalyst evaluation and control experiments proved that FUR was first hydrogenated to FOL, followed by hydrodeoxygenation to 2-MF, and finally hydrogenated to 2-MTHF catalyzed by the combination of three metals.
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LANGMUIR
·
2022
·
IF 4.331
Yibo Ao,Jinqing Ao,Ling Zhao,Liwei Hu,Fengsheng Qu,Biao Guo,Xue Liu
Cu(OH)2 nanomaterials are widely investigated for non-enzymatic glucose sensors due to their low-cost and excellent performance. Cu(OH)2 nanomaterials usually grow on substrates to form sensor electrodes. Reported works mainly focus on structure adjusting of the Cu(OH)2 nanostructures, while the optimization of substrates is still lacking. In the present work, directional porous Cu (DPC) was applied as the substrate for the growth of Cu(OH)2 nanograss (NG), and hierarchical structures of Cu(OH)2@DPC were prepared by alkaline oxidation. The morphology and microstructure evolution of the prepared hierarchical structures was investigated, and the non-enzymatic glucose sensing performance was evaluated. Cu(OH)2@DPC exhibits enhanced comprehensive non-enzymatic glucose sensing performance compared to the reported ones, which may benefit from both the effective adsorption of the Cu(OH)2 NG with a relatively high surface area and the high solute exchange of the DPC by a channel effect. This work provides new insights into the further improvement of the non-enzymatic glucose sensing performance of Cu(OH)2 nanostructures by optimizing the substrate structure.
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