MATERIALS CHEMISTRY AND PHYSICS
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2018
·
IF 2.21
Bing Zhang,Likang Fu,Shixing Wang,Libo Zhang
Nanosilica was functionalized with imidazoline groups and used as a new sorbent to recycle Pd(II) from aqueous solution. The sorbent was investigated by thermogravimetric analysis (TGA), transmission electron microscopy (TEM), fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS). The influence of pH, adsorption time and original Pd(II) concentration on recovery was discussed. The optimal pH value for adsorption was 4. The maximum adsorption quantity of Pd(II) was 69.6 mg/g. The coexisting ions exhibit little interference on the Pd(II) separation. The separation process of Pd(II) matches a pseudo-second-order kinetic model. The separation data obeyed best with the Langmuir isotherm model. The adsorbent exhibited good recyclability for Pd(II). Separation of Pd(II) takes place via chelation and ion-exchange. The adsorbent has wide application prospect to selectively capture Pd(II) from aqueous solutions.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMOSPHERE
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2017
·
IF 4.208
Cheng Liu,Nan Xu,Gang Feng,Dongmei Zhou,Xueying Cheng,Zuling Li
Due to the potential negative impact of nano silica (nSiO 2 ) on human's health and living environments, it is important to investigate their transport in soil environments. Hydrochars has been widely used in agricultural soil and phosphate (P) is an important nutrient, thus the aggregation and transport of nSiO 2 in saturated sand columns were investigated in single and binary systems of hydrochars and P. The experimental results showed that the nSiO 2 aggregates can be restablized by the adsorption of P or the attachment of hydrochars at high IS (>100 mM) and low pH (<7.0). Accordingly, the transport of nSiO 2 in sand columns is enhanced due to the smaller particle size. However, the nSiO 2 presents the distinct surface characteristics at pH > 7.0 from that at pH < 7.0. Thus, nSiO 2 has a better dispersivity in 300 mM NaCl solution at high pH (9.0). Nevertheless, their deposition to sands becomes pronounced in the presence of hydrochars and/or P. In particular, the formation of nSiO 2 -hydrochar-Phosphate clusters associated with the larger size mainly contributes to the enhancement of nSiO 2 retention in sand columns during the wide pH range, when hydrochars and P coexist in suspensions. The two-site dynamic model fitting results showed that the reversible retention is related to k 2 (First-order straining coefficient on site 2). The results in this study will provide the theoretical basis for assessing the retention of nSiO 2 in soil environment with the presence of hydrochars and phosphate.
研究领域:
环境科学
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农业科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Peng Zhou,ZhengYu Zhu,Wei She
Superhydrophobic cement-based materials are promising candidates to alleviate the performance deterioration of concrete constructions caused by water penetration. However, the weak mechanical performance of superhydrophobic surfaces, and severe reduction in compressive strength due to bulk modification, present significant challenges for the application of superhydrophobic cement-based materials. In this work, a superhydrophobic mortar (S-mortar) was prepared using a facile and economical method by surface micro-nano roughness construction and matrix silane modification, and nano-silica was introduced to compensate for the strength loss. The obtained S-mortar exhibits superb surface mechanical durability and chemical stability, no significant decrease in superhydrophobic property after sandpaper rubbing, knife scratches, and exposure to extreme temperatures, while even new surfaces exposed by cutting and powders obtained by grinding possess excellent water repellency. Furthermore, the superhydrophobicity endows the S-mortar with self-cleaning, anti-fouling, anti-icing, anti-freezing, and anti-corrosion properties. This approach creates a balance between superhydrophobic property and mechanical performance, broadening application prospects of superhydrophobic cement-based materials.
研究领域:
材料科学
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建筑工程
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
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IF 5.8
Yuanjie Wang,Luke Ma,Xueliang Pei,Wanfeng Zhuo,Jing Huang,Qing Huang
The inevitable residual carbon that normally appears in the polycarbosilane-derived SiC ceramics has notorious effects on the crystallinity and thermal conductivity of SiC ceramic. In this study, nano Si was employed to fully exhaust unwanted residual carbon in a liquid polycarbosilane. Through addition of 12 wt% theoretical nano Si and pyrolysis to 1600 °C, the ceramic yield of the liquid polycarbosilane increased from 72.0 wt% to 81.8 wt% and the C/Si ratio of ceramic product decreased from 1.14 to 0.99. Raman spectroscopy and transmission electron microscope also confirmed that the residual carbon almost completely disappeared. In addition, the crystallization ability of SiC also improved, and as a result dramatical improvement in the thermal conductivity of SiC f /SiC composite was achieved. The reaction mechanism was investigated in detail to understand the residual carbon trapping effect of nano Si during the precursor-to-ceramic conversion.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOILS AND SEDIMENTS
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2019
·Vol. 20
·期 2
·911-920
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IF 2.669
Zhang Mo,Li Duo,Ye Zhi,Wang Shiqi,Xu Nan,Wang Fang,Liu Shouqing,Chen Jianping,Gu Huajie
Purpose Nano silicon particles (nSiO 2 ) is one of the most widely used industrial engineered nanomaterials (ENMs). The extensive applications of nSiO 2 may pose potential risks to aquatic ecosystems and human health. Humic acid (HA) is a major component of soil and water that exists widely in the natural environment and adsorbs to the surface of nanoparticles, which affects the fate and transport of ENMs in soil. Therefore, it triggers the necessity to study the chemical reaction of HA controlling the sedimentation and transport of nSiO 2 . Materials and methods The sedimentation kinetics and transport breakthrough curves of nSiO 2 with/without HA in water-saturated porous media were studied in two electrolyte (NaCl and CaCl 2 ) solutions. The likely mechanisms were explored with both multiple technologies and numerical modeling including TEM-EDX, particle size distribution, zeta potentials, and the two-site kinetic attachment model (TSKAM). Results and discussion Our experimental results showed that the existence of HA generally increased the suspensivity and the transportability of nSiO 2 in NaCl and CaCl 2 solutions in packed sand columns at acidic pH. This result was attributed to the HA adsorption leading to the more negatively charged surface and the smaller size of nSiO 2 aggregates. However, the formation of coordination complexes associated with larger cluster among nSiO 2 between HA and Ca 2+ contributed to the increased sedimentation of nSiO 2 at alkaline pH. Subsequently, the presence of HA inhibited the transport of nSiO 2 in CaCl 2 solution at pH 9.0. Comparably, in NaCl at pH 9.0, HA showed the negligible effect on the nSiO 2 deposition in sand. Both the attachment and detachment parameters, which were obtained from fitting the breakthrough curves of ENMs using the TSKAM, could be used to well describe the transport behavior of nSiO 2 with HA under various conditions. In particular, the irreversible attachment parameters at site 2 on sand were positively related to the retention of nSiO 2 with HA. Conclusions The fate and transport of nSiO 2 can be distinctly affected by HA depending on the ion composition, ion strength, and pH in soil. This study will provide insights for assessing the mobility of nSiO 2 with HA in subsurface soil and aquatic environments.
研究领域:
环境科学
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土壤学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2019
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IF 3.206
Chao Xiong,Shixing Wang,Wentong Sun,Ying Li
Lead-containing wastewater comes mainly from batteries , petroleum refining, dyes, lead mine drainage and so on. Here, the nanosilica functionalized with diethanolamine (DPM-SNPs) was utilized as an adsorbent to remove lead ions from aqueous solution. TEM, SEM, XPS, FT-IR, Zeta potential and BET analyzer have been employed to characterize DPM-SNPs. The adsorption property of DPM-SNPs was studied by varying pH, reaction time, Pb(II) concentration and temperature. The selectivity, reusability and adsorption mechanism have been systematically studied. DPM-SNPs has a shorter adsorption equilibrium time (60 min) as well as a high efficiency for lead ions removal (154.38 mg/g) at 298 K. The optimized pH was 5.8, mainly due to electrostatic and chelation interactions between hydroxyl/amino groups and metal ions . DPM-SNPs showed better selectivity for Pb(II) again various interfering ions and the removal efficiency just decreased about 4% after five repeated circles. Besides, the adsorption behavior fit well to Pseudo-second-order kinetic, Langmuir and Dubinin-Radushkevich models, indicating that the chemical reaction is the rate-limiting step and the adsorption process belongs to monolayer adsorption. Thermodynamic studies revealed that the adsorption process was spontaneous, feasible and endothermic. Thus, the nanosilica functionalized with diethanolamine is a potentially effective and sustainable adsorbent for application in lead removal from wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Qiang Lin,Yasir Hamid,Honhang Wang,Min Lu,Xuerui Cao,Tong Zou,Zhiqin Chen,Bilal Hussain,Ying Feng,Tingqiang Li,Zhenli He,Xiaoe Yang
Foliar application of zinc (Zn) or silicon nanoparticles (Si-NPs) may exert regulatory effects on cadmium (Cd) accumulation in rice grains, however, their impact on Cd bioavailability during human rice consumption remains elusive. This study comprehensively investigated the application of Zn with or without Si-NPs in reducing Cd accumulation in rice grains as well to exactly evaluate the potential risk of Cd exposure resulting from the rice consumption by employing field experiment as well laboratory bioaccessibility and bioavailability assay. Sole Zn (ZnSO 4 ) or in combination with Si (ZnSO 4 +Si and ZnO+Si) efficiently lowered the Cd concentration in rice grains. However, the impact of bioaccessible (0.1215–0.1623 mg kg −1 ) and bioavailable Cd (0.0245–0.0393 mg kg −1 ) during simulated human rice consumption depicted inconsistent trend. The straw HCl-extractable fraction of Cd (F HCl-Cd ) exhibited a significant correlation with total, bioaccessible, and bioavailable Cd in grains, indicating the critical role of F HCl-Cd in Cd accumulation and translocation from grains to human. Additionally, foliar spraying of Zn+Si raised the nutritional value of rice grains, leading to increased protein content and reduced phytic acid concentration. Overall, this study demonstrates the potential of foliar application of ZnSO 4 +Si in mitigating the Cd levels in rice grains and associated health risks upon consumption.
研究领域:
环境科学
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食品科学
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农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Kui Liang,Hailin Yang,Wenxun Guo,Jianlong Du,Lingyun Tian,Xiaofeng Wen
Silicon has been regarded as a promising alternative anode material for next-generation lithium ion batteries (LIBs) due to its high theoretical specific capacity of 3590 mAh g −1 (Li 3.75 Si formed at room temperature). In this work, nanoscale silicon has been synthesized via a simple and effective metathesis reaction in which SiCl 4 is the silicon source and Zn is the reductant and solvent, at a mild temperature of 500 °C. The preparation process is very simple, facile and low-cost. The as-prepared silicon particles are spherical with a diameter of 150–200 nm, and the delithiation capacity of the nanoscale silicon can reach 1747.7 mAh g −1 at a current density of 0.2 A g −1 .
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Jie Cao,Jia Wang,Xiujun Wang,Jian Zhang,Kun Liu,Yixin Wang,Weikun Zhen,Yingpeng Chen
In this study, 3-aminopropyltriethoxysilane (APTES) and octyltriethoxysilane (OTES) reacted with nano-silica (NS), and the hydrophobicity , wettability and oil displacement performance of the modified nanoparticles (OAS) were changed by adjusting the amount of OTES. The synthesized amphiphilic silica was characterized by elemental analysis , flourier transform infrared spectrometer (FT-IR), thermogravimetric analysis (TG) and transmission electron microscopy (TEM). The results showed that the modification of silica was successful and showed different changes with the increase of the amount of modifier OTES. Besides, zeta potential , particle size measurement and transmission electron microscopy results show that OAS particles can maintain good stability. OAS-3 particles can change the core wettability from oil wet to neutral wet, and can significantly reduce the interfacial tension, which reduce the interfacial tension from 14.9 mN/m to 10.4 mN/m. In addition, the OAS particles also have a good emulsification effect, which can keep the emulsion stable for a long time. In the core flooding experiment, the modified amphiphilic silica particles can improve oil recovery. Compared with NS, OAS-3 particles have the best oil displacement effect, and the oil recovery can be increased by 10.3%. which has a certain potential in the application of enhanced oil recovery.
研究领域:
石油工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
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2021
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IF 9.297
Zhenhai Xu,Jianming Gao,Yasong Zhao,Shujun Li,Zhaoheng Guo,Xu Luo,Gaofeng Chen
Utilization of high volume ground granulated blast furnace slag (GGBS) to produce cement-based materials (CBMs) meets the requirements of sustainable development. However, high volume GGBS will significantly reduce some properties of CBMs. Incorporation of nanosilica is a potentially feasible approach to solve the problem. In present paper, effects of nanosilica (1 wt%, 2 wt% and 3 wt%) on hydration and microstructure of blended cement incorporating high volume GGBS (80 wt%) have been studied by testing setting time, compressive strength , hydration heat, hydration products and pore structure . Results reveal that nanosilica shortens the initial and final setting time of blended cement by 10.75%–20.56% and 10.45%–23.00%, respectively. Furthermore, nanosilica enhances early hydration heat release rate of cement and GGBS. Meanwhile, nanosilica increases cumulative heat release of blended cement by 23.40%–26.46%. However, nanosilica hinders cement hydration after curing for 7 d. Results of thermal analysis indicate that 80 wt% GGBS significantly reduces the content of chemically bound water, while nanosilica improves the parameter by 1.32%–5.91% at 56 d. Additionally, 80 wt% GGBS increases cumulative porosity by 31.89% at 28 d, but nanosilica decreases cumulative porosity by 3.05% at 28 d. Both high volume GGBS and nanosilica can decrease average pore diameter and enhance microstructure of cement paste . Ultimately, nanosilica increases the 28 d compressive strength by 8.27%–19.23%, which partially compensates for the reduction of compressive strength caused by high volume GGBS. This paper can provide the essential foundation for the theory of nanosilica-modified CBMs with high volume GGBS, help to improve the effective utilization rate of GGBS and realize sustainable development of CBMs.
研究领域:
建筑材料学
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可持续发展工程
✓ 已验证
DOI
高影响因子
CARBON
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2024
·
IF 10.5
Peng Zhou,Liang Pang,Yang Li,Huachan Fang,Peng Xiao,Feixiang Wu
The fabrication of three-dimensional (3D) honeycomb carbon frameworks, incorporating embedded silicon (Si) nanoparticles (NPs), is successfully achieved through a facile method involving mixing, carbonization , and acid pickling. The as-prepared Si@PVPC composites exhibit excellent electrochemical performances due to reasons as follows. (1) Honeycomb channels supply enough space to accommodate the expansion of Si NPs and so structural integrity of 3D honeycomb carbon frameworks are maintained during lithiation/delithiation processes. (2) Honeycomb channels offers fast transfer paths for Li-ion diffusion. (3) 3D carbon frameworks afford reliable and stable electric contact points. As a result, Si@PVPC electrodes show a capacity of 1294.3 mAh g −1 at 2 A g −1 after 1400 cycles with a capacity retention of 85.5 %. Even at an ultrahigh current of 16 A g −1 , Si@PVPC electrodes still show a capacity of 619.6 mAh g −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2018
·
IF 4.513
Chao Xiong,Ying Li,Shixing Wang,Yang Zhou
A new adsorbent was prepared via modifying nanosilica with guanidinium ionic liquids for effectively adsorbing gold ions from aqueous solution. Fourier transform infrared spectrometer (FT-IR), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS) were used to characterize the adsorbent. Batch experiments were applied to investigate the effects of initial pH, initial gold ions concentration, contact time and coexisting ions on the removal of gold ions from aqueous solutions. The adsorbent exhibits an excellent selectivity for gold ions in the presence of Pb(II), Mg(II), Ba(II) and Cu(II) ions. The removal rate of gold ions is higher than 97.06% in the pH ranges from 2 to 5. The maximum uptake was 120.56 mg/g under pH 5. The adsorption kinetic was well described by the pseudo-second-order model. The adsorption isotherm followed Hill model very well. Therefore, the new adsorbent has a potential application in the field of separation of gold ions from aqueous solutions.
研究领域:
材料科学
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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）