Journal of Cleaner Production
·
2022
·
IF 11.072
Kai Li,Zhu-yu Li,Cheng-Bo Zhang,Jia-qi Zhao,Li Zhao,Ji Liu,Shan-wei Ma,Qiang Lu
This study was focused on the value-increment of spent bleaching clay (SBC) to produce aromatic hydrocarbons and regenerated bleaching clay (RBC) via ex-situ catalytic pyrolysis with HZSM-5. The catalytic pyrolysis experiments were conducted to clarify the regulatory functions of pyrolytic temperature and SBC-to-HZSM-5 ratio (S/H) on the product distribution and aromatics generation. The adsorbed oil in SBC could be decomposed almost completely at 450 °C. The optimum aromatics yield of 3.49 wt% was achieved at catalytic temperature of 600 °C and S/H of 15. The solid product obtained under this condition underwent calcination at 500 °C and acid treatment successively to prepare RBC. The treatment did not affect the montmorillonite structure of clay. The RBC possessed good porous structures with newly generated micropores . The specific surface area and pore volume of RBC reached 163.32 m 2 /g and 0.29 cm 3 /g, higher than those of 146.17 m 2 /g and 0.25 cm 3 /g of fresh activated bleaching clay (ABC), indicating the better adsorption performance of RBC.
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
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2024
·Vol. 36
·期 9
·04024251
·
IF 3.1
Cuizhen Zhang,Xinde Tang,Xiaodong Chen,Haichao Guo,Xuefan Li,Laixue Pang,Yong Yang,Fuying Dong
Polycarboxylate superplasticizers (PCEs) have been extensively used in the areas of construction and building; however, the application limitation of PCEs has emerged owing to their sensitivity to clay. In this work, three anticlay PCEs were synthesized by introducing acrylamide (AM), methacryloxyethyltrimethyl ammonium chloride (DMC), or 3-[2-(methacryloyloxy) ethyl] dimethylammonio-propane-1-sulfonate (DMAPS) into the polycarboxylate copolymer of ethylene glycol monovinyl polyethylene glycol ether (EPEG) and acrylic acid (AA), denoted as A-PCE, D-PCE, and S-PCE, respectively. The structures of these superplasticizers were characterized by gel permeation chromatography (GPC) and Fourier-transform infrared spectroscopy (FTIR). Compared with the common polycarboxylate superplasticizers (O-PCEs), the resultant anticlay PCEs showed better dispersion as far as the fluidity of cement paste and mortar were concerned. With the content of 0.5% per weight sodium bentonite in place of cement, these anticlay PCEs exhibited better clay resistance than O-PCE. In addition, the compressive strengths of mortar and concrete by the addition of A-PCE, D-PCE, or S-PCE were slightly higher than those of O-PCE. Total organic carbon (TOC) revealed that the sensitivity of A-PCE, D-PCE, and S-PCE to clay was lower than that of O-PCE. X-ray diffraction (XRD) proved that the layer spacing of clay increased after treatment with superplasticizer. In combination of adsorption determination with XRD analysis, a possible mechanism was proposed. Unlike the PEG side chains inserting into the clay layers for O-PCE, the cations in functional groups entered the clay layers through cation exchange for anticlay PCEs preferentially.
研究领域:
建筑材料
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化学工程
·
土木工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Jun Wu,Wenzhong Zhang,Chunping Li,Erdan Hu
The effects of Fe(III) and Cu(II) on the sorption of atrazine (AT) and prometryn (PY) on clay minerals were investigated both preloaded and in solution. For smectite , Fe(III) preloading greatly enhanced AT and PY sorption at pH 4.0 and 6.0 but diminished AT sorption at pH 8.0. Cu(II) preloading promoted AT and PY sorption under alkaline conditions but suppressed AT sorption at pH 4.0. The adverse effects were not obvious for PY. While for illite and kaolinite , Fe(III) and Cu(II) had little or promotion effects due to the lower contents of them in these two minerals. In the co-sorption studies, for smectite, AT sorption remained at pH 4.0 and increased at pH 6.0 and 8.0, while PY sorption was inhabited over the pH range of 4.0–8.0 in the presence of Fe(III). AT and PY sorption were not affected by Cu(II) except for PY at pH 8.0, in which case, the sorption was promoted. For illite and kaolinite , Fe(III) and Cu(II) generally enhanced AT and PY sorption.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Fengyuan Wang,Min Yang,Yuchun Yang,Yanling Tian
With the escalating market demand for lithium, the development and efficient utilization of lithium resources have become crucial. This study introduced a method for leaching lithium from raw clay-type lithium ores using a composite sulfuric acid oxalic acid system. The experimental results revealed that the optimal conditions for the leaching process included roasting temperature of 600 °C, sulfuric acid concentration of 0.8 mol/L, liquid-solid ratio of 5 mL/g, leaching temperature of 90 °C, leaching duration of 90 min, and oxalic acid dosage of 2 g. Under these conditions, the leaching efficiency of lithium reached 93.45 %. The structural changes during the lithium leaching process and leaching mechanism were analyzed by XRD, SEM, TOF-SIMS. It was found that the minerals after mixed-acid leaching showed a loose morphology, a decrease in the average particle size, and a significant increase in the specific surface area as well as the pore volume, leading to improved lithium leaching efficiency. Furthermore, the mechanism underlying the mixed-acid leaching of lithium from clay-type lithium ores was explored. According to this mechanism, sulfuric acid first dissociated H + , which disrupted the mineral structure, allowing further destruction by oxalic acid. During this process, Li + was continuously replaced by H + and reacted with C 2 O 4 2− dissociated from oxalic acid to form water-soluble Li 2 C 2 O 4 .
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Jiwen Si,Ruifeng Guo,Yan Zhang,Weikun Ning,Yanbin Sun,Wenqing Li,Shiding Miao
The Linde A-Type zeolite (LTA zeolite) was synthesized from ball clay through two steps of calcination at 600 °C with the addition of NaOH/Al(OH) 3 in a mass ratio of 1:1.2/0.43 and hydrothermal treatment at 60 °C for 48.0 h. A certain amount of 3.0 wt% Ru 3+ was introduced before the hydrothermal treatment, and the Ru 0 -nanoparticles were in-situ fixed in the zeolite in a facile way. The synthesized materials were characterized by X-ray diffraction, infrared spectroscopy , field-emission scanning electron microscopy, transmission electron microscopy , and X-ray photoelectron spectroscopy. The zeolite with LTA structure was successfully synthesized from ball clay, and the catalytic performance was checked by using hydrogenation of benzene at 150 °C and P H2 = 5.0 MPa, and the turnover frequency (TOF) of cyclohexane reached 4000 mol/(mol·h). The good stability was demonstrated by the high conversion of 94.0% and 98.0% of benzene after cycling use for many runs of catalysis and calcination at 550 °C.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yuetong Kang,Yonghui Zan,Yujie Cong,Xiaoyu Wang,Yufeng Luo,Lidong Li
Non-biotic antibacterial materials have drawn increasing attention. Some natural clays are able to promote the generation of reactive oxygen species , rendering them as promising candidates in combination with their abundant reserves, low cost and biosafety. However, the antibacterial performance of raw clay is usually below satisfaction due to poor solubility and restricted surface area . Hence, the modulation on dispersion form and the surface modification are essential for the design and practical application of natural clays as antibacterial materials. Herein, we developed a facile method to prepare a Pickering nanoemulsion with chitosan-coated montmorillonite (MMT) nanosheet . The addition of chitosan benefited the exfoliation of raw MMT and the stabilization of resultant colloidal MMT nanosheets, which were subsequently employed for preparing Pickering emulsion . The emulsion exhibited good stability and small size endowing them with good diffusion ability to interact with bacteria. Furthermore, the Pickering emulsion inherited the MMT nanosheet peroxidase-like property and displayed good antibacterial activity .
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Marine Science
·
2022
·
IF 5.247
Liu Zhengyu,Yu Zhiming,Cao Xihua,Jiang Wenbin,Yuan Yongquan,Song Xiuxian
Red tide is a kind of marine disaster caused by the accumulation or proliferation of microalgae and other organisms in a short period of time, and utilizing modified clay to control and inhibit red tide is the preferred method. Among them, the application potential of organic-modified clay is high; unlike inorganic and microbial modifications, it has a broad-spectrum removal capacity on red tide algae at extremely low dosages. However, it has some disadvantages such as severe toxicity and high residual turbidity, leading to several limitations in its practical application. Therefore, it has become urgent to select organic-modified reagents with higher efficiency, weaker toxicity and lower residual turbidity. In this study, the typical red tide alga——Prorocentrum donghaiense was selected to detect the removal capacity of Polydimethyl diallyl ammonium chloride (PDMDAAC) modified clay (MP) by comparing with the Hexadecyl trimethyl ammonium bromide (HDTMA) modified clay (MH). Not only the physiological stress and flocculation effects of two modified clays on microalgae had been discussed, but also the properties of the modified clays had been characterized in this study. The results showed that the low degree of oxidative stress and less damage to the cell membrane make MP more environmentally friendly, PDMDAAC can remove microalgae at a low dose (2 mg/L) and quickly clarify the water by significantly enhancing the flocculation capacity of clay. In addition to discussing the removal mechanism of two modified clays on microalgae, schematic diagrams of the pathways were drafted. This study will provide support for the development of organic-modified clay.
研究领域:
海洋生物学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Yi Liao,Shan-Shan Chai,Wei-Bin Zhang,Yao Yao,Jing-Lei Yang,Yi Yin,Jia-Jun Li,Ze-Qin Yang,Xue-Jing Ma,Qiang Peng
Clay minerals, naturally occurring two-dimensional layered nanomaterials, hold significant interest in electrochemical energy storage. However, their practical use is hindered by the pronounced stacking and aggregation of layers. Here, we selected eight clay minerals of kaolinite, halloysite, montmorillonite, vermiculite, palygorskite, sepiolite, talc and chlorite, employed a simple chemical water bath method to insert diamine molecules with different chain lengths between the layers of these minerals. This approach aimed to prevent stacking and aggregation while allowing controlled expansion of the layer spacing. Subsequently, the montmorillonite (M) with relatively high specific capacitance were selected for further discussion. X-ray diffraction results show that the layer spacings of diamine ( x DM, x = 2–6) modified montmorillonite (M/ x DM) could be optimized within 1.189 nm and 1.455 nm, of which the butanediamine (4DM) pillared montmorillonite composites (M/4DM) exhibited the most suitable layer spacing of 1.362 nm for efficient Na 2 SO 4 ion transportation. Additionally, the CeO 2 loaded montmorillonite (CeO 2 -M) composites were further prepared by the same method to obtain diamine pillared CeO 2 loaded montmorillonite (CeO 2 -M/ x DM). The specific capacitance of CeO 2 loaded and butanediamine pillared montmorillonite composites (CeO 2 -M/4DM) was 573.9 F g −1 , which was 33.9% higher than the counterpart without modification (CeO 2 -M). The assembled supercapacitor CeO 2 -M/4DM//AC exhibited almost no loss in capacitance after 10,000 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Jinlong Cui,Kun Li,Liwei Cheng,Qingping Li,Zhenfeng Sun,Peng Xiao,Xingxun Li,Guangjin Chen,Changyu Sun
To improve the exploitation efficiency of future commercial marine natural gas hydrate , it is of critical significance to have a solid understanding of the spatial differences of hydrate dissociation. However, few studies have investigated this topic. In this study, a novel L-shape Hydrate Simulator (LHS) with a vertical vessel and a horizontal vessel was established and used to investigate the spatial differences of hydrate dissociation in water-saturated methane hydrate samples by depressurization. It was amazingly found that the hydrate dissociation was abnormally much faster in the location far from the mining well with the highest pressure than in the location near the mining well with the lowest pressure in the vertical vessel. This abnormal phenomenon was caused by the earliest uneven vacating of pore spaces in the vertical vessel. This phenomenon was not obvious in the horizontal vessel as there was little difference in the pore spaces vacating rates in different locations. The pressure reduction leaded to faster hydrate dissociation near the mining well in the horizontal vessel. The experiments on sediments with different permeability indicated that the sediments with higher permeability showed more pronounced spatial difference of hydrate dissociation, and the presence of clay (montmorillonite) in the sediments had significant impacts on the spatial difference of hydrate dissociation. The results in this study demonstrate that vacating of pore spaces of sediments is of determining significance for increasing hydrate dissociation rate in water-saturated sediments and provide important implications for developing methods to enhance the gas production from marine hydrate deposits.
研究领域:
海洋地质学
·
能源工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 11
·11126-11139
·
IF 2.914
Li Zhenyuan,Pan Zhidong,Wang Yanmin
A raw illite-smectite mixed-layered clay (RI/S) was ground for preparing nano-sized I/S clay (NI/S) and subsequently amino-functionalized via grafting of 3-aminopropyltrithoxysilane (APTES) (NH 2 -RI/S and NH 2 -NI/S, respectively). The samples were characterized by particle size analysis, specific surface area measurement, X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and 29 Si nuclear magnetic resonance ( 29 Si NMR). Compared to RI/S, NI/S has a narrow particle size distribution and appears in a platelet-like morphology due to the disintegration/exfoliation of RI/S after grinding. Based on the 29 Si NMR spectra, the appearances of tri-silicate units indicate the chemically grafting of APTES molecules on NH 2 -RI/S and NH 2 -NI/S, respectively. NH 2 -NI/S can adsorb greater amounts of Pb(II) cations and Cr(VI) anions rather than NH 2 -RI/S since NH 2 -NI/S grafts more amounts of amine groups (-NH 2 ). The isotherm data for adsorption of Pb(II) cations and Cr(VI) anions can be described by the Langmuir model at different temperatures (i.e., 10 °C, 30 °C, and 50 °C), respectively. The maximum adsorption amounts of Pb(II) cations and Cr(VI) anions onto NH 2 -NI/S calculated by the Langmuir isotherm model are 131.23 mg/g and 36.91 mg/g at 50 °C, respectively. The adsorptions of Pb(II) cations and Cr(VI) anions onto NH 2 -NI/S involve in the surface complexation of NI/S and amine groups.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2019
·Vol. 95
·期 5
·1400-1411
·
IF 2.659
Hongli Tian,Yuewen Shao,Lijun Zhang,Peng Jia,Zhanming Zhang,Qianhe Liu,Shu Zhang,Qing Liu,Yi Wang,Xun Hu
BACKGROUND Ordinary clay is an abundantly available and widely distributed material, the use of which as supporting material can minimize the cost in manufacturing catalysts. This study investigated the potential for the direct use of ordinary clay and treated clay as supports of copper (Cu)-based catalysts for hydrogenation of furfural and some phenolic compounds. RESULTS The catalyst treated with alkali showed better activity at 100 °C whereas the activity of other catalysts was negligible, and when the temperature was raised, the activity of all the catalysts was obviously improved. In addition, the catalysts treated with sodium hydroxide (NaOH) showed fair activity for 5-hydroxyl methyl furfural, vanillin and benzaldehyde, and the stability of the catalyst also was good: after four cycles of experiments, the yield of furfuryl alcohol could still reach >95%. CONCLUSIONS Activation of clay with NaOH effectively enhanced not only the surface area and porous structures, but also the alkalinity of the catalyst, suppressing side reactions such as acetalization between furfural and ethanol, and facilitated hydrogenation of furfural. Comparing with clay washed with sulfuric acid or calcined at various temperatures, the clay activated with NaOH showed superior hydrogenation of not only furfural, but also 5-hydroxyl methyl furfural, vanillin and benzaldehyde, as a result of the presence of abundant mesopores and alkaline sites. The ordinary clay-supported Cu catalyst also showed acceptable activity for hydrogenation reactions at a higher reaction temperature, which has particular importance for practical applications because the clay can be used directly as supporting material. © 2019 Society of Chemical Industry
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2021
·Vol. 11
·期 12
·1407
·
IF 2.644
Weige Luo,Zheng Zeng,Liang Bian
This work aims to evaluate the effect of lattice substitution on adsorption of hexavalent chromium by three kinds of typical clay minerals, and its common isomorph via experiments and calculations were performed based on density functional theory. The experiments (25 °C, 4 h, pH = 4 and without stirring) confirmed an order of adsorption capacity as follows: Montmorillonite (12 mg/g) > Nontronite (9 mg/g) > Beidellite (8 mg/g). Accordingly, the Mulliken populations, density of states, and band structures of the mineral models with the structural Al, Mg, Fe(II), Fe(III), and Al (in tetrahedrons) on behalf of five species of isomorph were calculated. The calculation results explain the differences between hexavalent chromium adsorption capacity of five kinds of isomorph by means of atom, key populations, overlapping valence electron orbitals, and the variation of energy band. However, no overlapping orbitals were observed in the adsorption system with structural Mg. It is implied that the structural Mg has little influence of hexavalent chromium adsorption. In conclusion, our study contributes to achieving a better understanding of modified clay minerals materials applications.Keywords:hexavalent chromium;clay minerals;density functional theory;lattice substitution
研究领域:
环境科学
·
材料科学
✓ 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）