CELLULOSE
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2019
·Vol. 26
·期 15
·8301-8312
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IF 3.917
Li Xiangping,Liu Juping,Zhang Jianguang,Liu Bin,Ma Wenchao,Wang Chuanbin,Chen Guanyi
Lignocellulosic biomass-derived bio-oil is considered as a promising renewable biofuel. In this paper, incipient wetness impregnation method, ammonia grafting method and direct synthesis method were employed as nickel loading methods for the preparation of Ni/Al-SBA-15 catalysts. The effects of these nickel loading approaches on the structure and hydrodeoxygenation performance of Ni/Al-SBA-15 were studied. The structure of Ni/Al-SBA-15 was significantly influenced by the nickel loading methods, including the specific surface area, the pore volume, the wall thickness and so on. Nickel loading methods also affected the actual nickel content of nickel-based catalysts. Unsuccessful loading of nickel species was observed during the preparation of Ni/Al-SBA-15 using direct synthesis method. The conversion of eugenol and selectivity of products after hydrodeoxygenation in n -dodecane over Ni/Al-SBA-15 catalysts were investigated. Results showed that the conversion of eugenol nearly reached 100% for all the reaction, but the composition of product was significantly different when using different Ni/Al-SBA-15 as hydrodeoxygenation catalyst. The reaction pathway of eugenol hydrodeoxygenation in n -dodecane was also speculated in this paper. Graphic Effects of nickel loading approaches on the structure and hydrodeoxygenation performance of Ni/Al-SBA-15 were investigated. For the liquid phase hydrodeoxygenation of eugenol to hydrocarbon, catalysts prepared by ammonia grafting method exhibited the highest catalytic activity.
研究领域:
催化化学
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可再生能源
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生物质转化
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材料科学
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Mineral Processing and Extractive Metallurgy Review
·
2017
·
IF 1.219
Wencui Chai,Yanfang Huang,Guihong Han,Jiongtian Liu,Shuzhen Yang,Yijun Cao
In order to remove aluminum ions in bauxite processing wastewater, two natural clay minerals (bentonite and kaolin) were used as adsorbents. The adsorption behaviors including kinetics and isotherms were studied at much broader pH range, higher temperature, and higher Al(III) concentration by batch experiments. The adsorption mechanisms were investigated by optical microscope, zeta potential testing, and XRD analysis. The results show that Al(III) adsorption is strongly pH dependent and increases clearly with increasing pH. The pseudo-second-order kinetic model can best describe the adsorption process, and the intra-particle diffusion was not the sole rate-controlling step. The Langmuir–Freundlich model can fit best the adsorption equilibrium data, and the maximum capacities of Al(III) adsorbed on bentonite and kaolin reach to 8.52 mg g–1 and 0.58 mg g–1, respectively, at 35°C. Thermodynamic studies display that the adsorption of Al(III) onto clay minerals is non-spontaneous. The adsorption of Al(III) onto bentonite is endothermic and causes an increase in the entropy, while kaolin is exothermic and causes a decrease in the entropy. The interaction mechanisms of Al(III) with bentonite and kaolin involve electrostatic attraction, cation exchange, surface complex, and precipitation. Bentonite as adsorbent has more potential to remove Al(III) than kaolin.
研究领域:
环境科学
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吸附技术
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废水处理
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黏土矿物学
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化学工程
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WATER RESEARCH
·
2026
·
IF 12.8
Beibei Liu,Na Pan,Chunyi Sun,Weiying Xu,Wen Song,Liangguo Yan,Tao Yan,Yu Du,Yanxia Zhao,Baoyu Gao
Hydrolyzed species critically govern the coagulation behavior of Ti-based coagulants in chemically enhanced primary sedimentation (CEPS), thereby influencing the subsequent anaerobic fermentation of CEPS sludge. However, whether and how preparation-induced Al-Ti speciation modulates solid-liquid interfacial interactions and substrate accessibility during acidogenic fermentation remains unclear, limiting the simultaneous optimization of pollutant removal and resource recovery. Here, polyaluminum-titanium chloride (PATC) composite coagulants with distinct hydrolyzed species distributions were synthesized by slow alkaline titration (S-PATC) and electrodialysis (E-PATC). Compared with S-PATC, E-PATC achieved 99.52%, 68.60%, and 71.38% higher removal efficiencies for PO 4 3− -P, UV 254 , and COD, respectively. The superior CEPS performance was attributed to the synergistic effects of highly charged small species and highly polymerized macromolecular species. Crucially, the hydrolyzed Al-Ti species introduced during CEPS acted as a front-end regulator of sludge fermentability by reconstructing solid-liquid interfacial interactions and modulating substrate accessibility. Compared with S-PATC-loaded sludge, E-PATC-loaded sludge exhibited weaker hydrophilic repulsion and higher volatile fatty acids (VFAs) production, which was associated with enhanced interfacial mass transfer. Under alkaline conditions, enhanced hydrophilic repulsion coexisted with electrostatic repulsion in the E-PATC system, with the latter predominating and promoting greater sludge disintegration. Consequently, the maximum concentration of soluble organic matter increased from 764 mg/L to 2222 mg/L on Day 4, providing abundant substrates for acidogenic microorganisms. As a result, the VFAs yield reached 1250.83 mg-COD/L, which was 6.67% higher than that obtained with S-PATC-loaded sludge. This work provides evidence that hydrolyzed Al-Ti species play a pivotal role in coagulation behavior and subsequent sludge fermentation.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 1
·109-119
·
IF 3.925
Debin Ji,Yao Liu,Xuepeng Wang,Zhiqiang Qiao,Jialiang Yang,Ziheng Bai,Shuxia Guan,Zhandong Li,Hongjun Wu,Yongde Yan
Nuclear energy is widely used as an efficient energy. However, the production of a large amount of uranium-containing wastewater is considerably harmful to the environment. Adsorption is a commonly used method for removing uranium ions from water. In this study, carbon nanotubes (CNTs) were first modified with polyethyleneimine (PEI), and then Ni–Al-layered double hydroxide (LDH) was anchored to CNT-PEI (CNT-P) by using the co-precipitation method to obtain CNT-P/LDH (NO3−). The experimental results indicated that the adsorption process was consistent with Langmuir kinetic adsorption and Sips adsorption isotherm models at the pH of 6. The fit result of the Sips adsorption isotherm model indicated that the adsorption capacity of CNT-P/LDH was 646.6 mg g−1. XPS analyses showed that the adsorption of uranium on CNT-P/LDH mainly involved three aspects. Tests were conducted for different salinities, and the results showed a uranium removal rate of >95% at a salinity of 3.5%.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Haifeng Yang,Zhiqiang Qiao,Weimiao Wang,Pengfei Tang,Shuaishuai Man,Xiaodong Li,YuTing Xie,Deyun Tang,Xueming Li,Guangcheng Yang
Private information protection of electronic chips which store large amounts of sensitive data, is a crucial issue in electromechanical systems nowadays. Here, a self-destructive microchip based on an instantaneous thermite reaction is designed to prevent the leakage of electronic information. The device is consisted of a silicon test wafer and an upper energetic film coated by a simple drop-casting technique. A series of Al/BiOX-based nanothermites have been prepared for decreasing the reaction sensitivity, meanwhile optimizing the destruction efficiency of the energetic film system. Among them, Al/Bi 2 O 3 nanothermite containing 30 wt% BiOBr possesses a low sensitivity (45 J), the maximum pressure peak (1.93 MPa) and pressure effect duration due to multiple interactions of the three nano-scale energetic components. Besides, the energetic film prepared by this nanothermite fomula also exhibits a more effective destruction of the device. The high-speed photography results demonstrate that the violent reaction shatters the thick energetic microchip (∼1 mm) within merely 0.5 ms. Importantly, the efficient destruction of energetic microchips shows excellent reproducibility in different working scenes, including Air or Ar atmosphere. It is believed that this self-destructive device with environmentally friendly components and simple but adaptive design can be extensively used in various electric microcomponents.
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LANGMUIR
·
2022
·
IF 4.331
Zhiliang Jin,Xiaohong Li,Teng Li,Youji Li
Graphdiyne (g-CnH2n–2) is a new carbon material composed of sp and sp2 hybrid carbon atoms. Since the synthesis by Li’s team, graphdiyne has been widely studied in other fields because of its excellent properties. In this paper, graphdiyne was synthesized from copper-containing materials and the composite GDY/CuI/MIL-53(Al) S-scheme heterojunction is prepared for photocatalytic cracking of water to produce hydrogen. First, GDY/CuI was prepared by organic synthesis, and then GDY/CuI was anchored on the surface of MIL-53(Al) by in situ ultrasonic stirring. After the continuous optimization of experimental conditions, the final hydrogen evolution rate is much higher than that of MIL-53(Al). This efficient photocatalytic performance can be attributed to the S-scheme heterojunction formed by the unique energy band arrangement. At the same time, the mechanism of charge transfer was demonstrated by in situ irradiation X-ray photoelectron spectroscopy. The strong interaction among the three strongly promotes the separation and transfer of photogenerated electron–hole pairs.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Shuya Liu,Xinjie Ma,Yuxin Liu,Weiwei Chen,Yuejie Ai,Kexin Li,Xiushen Ye,Ming Fang,Xiaoli Tan
To fully utilize the customizable characteristics of metal-organic framework (MOF) materials in environmental applications, it is important to precisely modulate the branching groups of MOFs for improved performance. In this work, MIL-53(Al) was modulated by different numbers of nitrogen atoms and carboxyl groups/phosphite groups (MOF-N 2 -(COOH) 3 , MOF-N 3 -(COOH) 4 , and MOF-N 2 -(PO(OH) 2 ) 3 ) via a post-synthesis modification method, and the influence of functional groups and chain length on adsorption and the mechanism of modified groups on the adsorption of uranium (U) are demonstrated. Batch experiments suggest the removal of U(VI) reaches 37%, 27%, and 90% for MOF-N 2 -(COOH) 3 , MOF-N 3 -(COOH) 4 and MOF-N 2 -(PO(OH) 2 ) 3 , respectively (pH = 4.0, T = 25 ℃, I = 0.01 M NaNO 3 ). The surface complexation between UO 2 2+ and the surface of functional groups on the modulated MOF dominates the adsorption. Nevertheless, the steric hindrance in MOF porous structure can explain the inferiority of U(VI) adsorption on MOF-N 3 -(COOH) 4 (27%) to MOF-N 2 -(COOH) 3 (37%). MOF-N 2 -(PO(OH) 2 ) 3 is more conducive to uranyl adsorption than MOF-N 2 -(COOH) 3 or MOF-N 3 -(COOH) 4 , which is due to better affinity of U(VI) to phosphate group than the carboxyl group by density functional theory (DFT) calculation. Moreover, the excellent regeneration performance and U(VI) adsorption of MOF-N 2 -(PO(OH) 2 ) 3 in natural water or wastewater further confirmed the practical application of modulated MOFs in practical application.
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CHEMOSPHERE
·
2022
·
IF 8.943
Zhiyu Wei,Jie Chen,Hongjin Tong,Mingchao Sun,Jing Tian,Lu Fan
CNTs-Al was prepared by ball milling combined with sintering process and then used for CNTs-Al-Cu synthesis with chemical deposition method. The obtained CNTs-Al-Cu composite was systematically characterized and its NO 3 − -N reduction performance under alkaline condition was also evaluated. As indicated by the reduction batch experiment, 80.2% of NO 3 − -N removal efficiency was obtained in 90 min at pH of 9. The product of the reduction process was dominated by NO 2 − -N, which was further reduced to harmless N 2 . The reusability of CNTs-Al-Cu composite was evaluated, and the experiment results showed that 68.1% of NO 3 − -N removal efficiency was maintained after 3 cycles of regeneration. Finally, based on the characterization results and kinetic analysis, it was concluded that micro-electrolysis was mainly responsible for the removal of NO 3 − -N by CNTs-Al-Cu.
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RENEWABLE ENERGY
·
2022
·
IF 8.634
Lincai Peng,Xin Huangfu,Yao Liu,Huai Liu,Junhua Zhang
The processing of C6 sugars to alkyl levulinate (AL), a versatile biomass-derived building block, can be readily implemented via the straightforward acid-catalyzed reaction in alcohol medium while it remains a challenge to produce AL from C5 sugars in the one-pot procedure over a monolithic catalyst. In this contribution, a budget and multifunctional natural lignocellulose welded Zr–Al bimetallic hybrid (ZrAl@CS-MSA) has been successfully constructed with crude corn stalk as a sustainable support. The becoming Lewis and Brønsted acid sites of ZrAl@CS-MSA catalyst guarantee a high AL yield of 54.3% from xylose via a one-pot process in a renewable n -butanol medium. Experimental findings revealed that the sulfonic group of ZrAl@CS-MSA plays a significant role in the xylose dehydration, furfuryl alcohol etherification and alcoholysis reactions while Zr species is in charge of the transfer hydrogenation of furfural. The Al species enclosed in ZrAl@CS-MSA can regulate its Brønsted and Lewis acidity, accelerating the etherification and alcoholysis reactions as well as alleviating the over hydrogenation of AL. This work opens a green, sustainable and reliable avenue for producing C5 sugar-based AL using natural lignocellulose-related multifunctional catalysts.
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CRYSTENGCOMM
·
2022
·Vol. 24
·期 9
·1764-1772
·
IF 3.756
Zhenzhen Cui,Lei Zhao,Ting Wang,Jiangyan Cao,Yufang Qiao,Chaojie Pi,Zhaohui Fang,Jianbei Qiu,Xuhui Xu,Xue Yu
The up-conversion features of lanthanide-doped nanocrystals endow them with promising application potential in optical encoding, optical temperature sensing, bioimaging, diagnostics, and therapeutics. Here, tailoring the local structure to enhance the up-conversion luminescence intensity was achieved through chemical substitution with Al in KYbF4: Er3+ up-conversion nanoparticles (UCNPs). Moreover, the as-explored KYb0.98-xAlxF4: 0.02 Er3+ exhibits a superior temperature-dependent up-conversion performance. Herein, the relative sensitivity of the 2H11/2/4S3/2 thermally coupled levels (TCLs) and 4F9/2/4S3/2 non-thermally coupled levels (NTCLs), particularly below the room temperature, was evaluated. This indicates the potential application of the as-explored UCNPs with improved up-conversion performance as an optical temperature sensor for low temperature detection.
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OPTICAL MATERIALS
·
2022
·
IF 3.754
Man Wang,Jun Wang,Mengjun Li,Xinru Wang,Yating Sima,Qiang Wu
Hexagonal Zn–Al hydrotalcite (Zn–Al LDHs) has become a research hotspot in the field of photocatalysis due to efficient photocatalytic performance, low cost and non-toxicity. In this research, In 2 S 3 /Zn–Al LDHs composites were firstly synthesized by one-pot method with InCl 3 and TAA as raw materials. The crystalline structure, surface morphology , chemical composition, together with optical properties of the samples were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectra (FT-IR), UV–Vis diffuse reflectance spectrometry (DRS), and Photoluminescence spectra (PL). The photocatalytic performance of the composite photocatalyst was investigated by degradation of tetracycline (TC) under visible-light irradiation. The photochemical properties and cyclic stability of the photocatalyst were further explored. Experimental results display that the photocatalytic efficiency of In 2 S 3 /Zn–Al LDHs (1:2) was remarkably superior to that of pure In 2 S 3 and Zn–Al LDHs. In 2 S 3 /Zn–Al LDHs (1:2) composite showed high photocatalytic activity for TC degradation (92.2% within 30 min). The modification of Zn–Al LDHs by In 2 S 3 prompted the separation of photogenerated electron-hole pairs and thus improved the photocatalytic performance. It can be inferred that the efficient photocatalytic performance of In 2 S 3 /Zn–Al LDHs composites could remove many hazardous pollutants in wastewater.
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WATER RESEARCH
·
2022
·
IF 13.4
Junjie Yu,Hui Xu,Dongsheng Wang,Hongyan Sun,Ruyuan Jiao,Yang Liu,Zhiyuan Jin,Shuo Zhang
Most studies on the interaction between coagulation and NOM (natural organic matter) currently focus on pollutant removal and coagulant species distribution, while studies on floc aging are lacking. Investigation onto the effects of floc aging could guide further processes that utilize flocs, such as densadeg sludge recirculation, floc predeposition for ultrafiltration, sludge condensation, and other traditional sludge reflux processes. In this study, flocs generated by Al 13 and AlCl 3 in microparticle- and nanoparticle-containing water were investigated, and the effect of floc aging on NOM was quantified based on several organic matter characterization techniques. Flocs absorb and release organics during aging. The flocs generated from micro-SiO 2 have a significant absorbing effect for LWM-N (low-molecular-weight neutral substances) and protein-like substances, while the absorption of NOM by flocs generated from nano-SiO 2 is insignificant. HS (humic substances) with high aromaticity are released during floc aging. From the molecular perspective, the molecules released during floc aging are those with higher double bond equivalents and higher aromaticity, while the absorbed molecules are those with lower double bond equivalents and lower aromaticity. 2D-COS (two-dimensional correlation spectroscopy) demonstrated that the flocs generated by Al 13 and AlCl 3 had the same organic release patterns but different intensities, while the flocs generated in the micro-SiO 2 and nano-SiO 2 systems had different organics release patterns. Abundant aluminum hydrolysates with low polymerization and amorphous Al(OH) 3 would be produced from AlCl 3 during the coagulation process and then undergo hydroxyl‑bridging reaction and crystallization during floc aging, thus releasing more HS with high aromaticity into the supernatant; in comparison, prehydrolyzed Al 13 produces a more stable floc and releases less HS during aging. The flocs produced by nano-SiO 2 and Al-based coagulants release higher aromaticity HS into the water than those produced by micro-SiO 2 , which may be related to the formation of more highly polymerized degree hydrolysates and nanocrystalline Al(OH) 3 in the nano-SiO 2 system. The flocs generated in water with micro-SiO 2 may contain a large amount of Al-OH and have a loose structure, thus further absorbing NOM, such as protein-like substances and LWM-N. In contrast, the flocs generated from nano-SiO 2 possess abundant adsorbed water and a denser structure; thus, organic matter cannot be absorbed stably.
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