JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2019
·
IF 1.479
Kun Wang,Hao Pang,Hao Huang,Linxia Song,Jianheng Huang,Yangyang Zhao
Multi-armed polycarboxylate superplasticizers (SPCEs) were prepared via esterification-copolymerization in aqueous media from various polyols (including glycerol, xylitol and mannitol), acrylic acid (AA) and isopentenyl oxy polyethylene glycol ether (TPEG). The structures of the SPCEs (SPCE-prop, SPCE-pent and SPCE-hex bearing three, five and six arms, respectively) were characterized by NMR and GPC. The influences of the SPCEs on the fluidity, adsorption and early hydration behaviors of cementitious systems were investigated in detail and are discussed herein. Experimental results indicated that as the number of pendant arms increased, the dispersion performance, compactness of the cement microstructures and set retarding effects increased initially and subsequently decreased (SPCE-pent offered the best performance). This effect was primarily due to the synergistic effects of steric hindrance and electrostatic repulsions. Further results indicated that SPCE-pent can be used as a high-range delivery admixture to produce high performance concrete.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Geoenergy Science and Engineering
·
2023
·
IF 0
Hengfeng Shan,Youhong Sun,Bing Li,Yifeng Shen,Yun Qi,Guobiao Zhang
Hydraulic fracturing has been proven useful for improving the gas production efficiency of low-permeability hydrate reservoirs. However, no specific fracturing fluid system exists for marine hydrate reservoirs. Applying conventional water-based fracturing fluids in low-temperature (<293.2 K) marine hydrate reservoirs can lead to difficulties in gel-breaking and hydrate instability caused by external additives. In this study, we developed two water-based fracturing fluid systems that exhibited good gel-breaking performance at low temperatures (278.2–288.2 K), one comprising ammonium persulfate (APS), ferrous sulfate (FeSO 4 ), and citric acid (CA), the other APS and triethanolamine (TEA). In addition, we investigated the influence of crosslinking and gel-breaking reactions of the fracturing fluids on the methane hydrate phase equilibrium . The breaking time of the APS-FeSO4-CA system at 278.2K, 283.2K, and 288.2K was 30 min, 75 min, and 120 min respectively. On the other hand, the APS-TEA system accomplished the same task in 3 h, 6 h, and 10 h respectively. Furthermore, methane hydrate phase-equilibrium data showed that the fracturing fluid's three states, base fluid (BF), fracturing fluid gel (FFG), and gel-breaking liquid (GBL), all exerted an inhibitory effect on the phase equilibrium, with the hydrate suppression temperature (ΔT) ranging from 0.4 to 1.0 K. The differences in their inhibitory effect were primarily related to the micromorphology of the hydroxypropyl guar gum (HPG) molecules and the number of active hydroxyl (-OH) groups in the solution. Cryo-scanning electron microscopy (SEM) measurements revealed that the micromorphology of HPG in BF, FFG, and GBL transformed from regular ribbon-like structures to 3-D network structures and then to hole-containing, short ribbon-like structures. FFG formed a regular 3-D network structure after adding crosslinking agents to the BF. The ΔT values reversed from FFG < BF to FFG > BF when the HPG concentration increased from 0.3 wt% to 0.5 wt%, possibly due to the difference in the HPG molecules' water adsorption capacity before and after crosslinking. The broken HPG molecules with OH − groups in the solution were transformed into residues after gel-breaking, decreasing the GBL's inhibitory effect. Therefore, our results indicated that micromorphology variations could cause differences in the HPG molecules' water adsorption capacity, ultimately leading to ΔT differences. Based on our findings, the gel-breaking fracturing fluid systems we developed demonstrated potential for optimizing hydraulic fracturing in marine hydrate reservoirs.
研究领域:
石油工程
·
化学工程
✓ 已验证
DOI
Materials
·
2022
·Vol. 15
·期 4
·1524
·
IF 3.748
Yu Gao,Hongwei Zhao,Guang Chen,Qi Peng,Yingying Liu,Fei Song,Qingquan Liu
In this work, a crosslinked polycarboxylate superplasticizer (crosslinked-PC) was synthesized via the free radical polymerization reaction. Pentaerythritol tetraacrylate (PETA) was used as the crosslinked agent. A comparative comb-like polycarboxylate superplasticizer (comb-like-PC) was prepared under the same reaction conditions. The dispersion retention capacity, dispersion capability, hydration characteristics of the cement paste and setting time were investigated in detail. At the dosage of 0.6% bwoc, the fluidity of the cement/crosslinked-PC paste was about 340 mm, which was 40~50 mm larger than the cement/comb-like-PC paste. The dispersion retention capacity of the cement/crosslinked-PC paste was observed to be much superior due to higher adsorbed amounts on the cement particles. Moreover, the cement/crosslinked-PC paste exhibited the initial and final setting durations of 196 and 356 min, respectively, which indicated an enhancement of 18 and 68 min compared to the cement/comb-like paste. The crosslinked copolymers exhibit a stronger retardation effect than the comb-like copolymers due to their enhanced adsorbed amounts and stronger steric hindrance effect. This is further illustrated by the characterization of the hydration process and hydration products. It can be concluded that it is feasible to improve the dispersive capacity and the dispersion retention capacity of PC by changing the molecule structure from comb-like to slightly crosslinked.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 31
·期 2
·812-824
·
IF 4.705
Tian Haizhou,Cheng Sha,Zhen Jianghong,Lei Ziqiang
In arid areas, the rapid evaporation of water leads to severe water shortage for plant growth. Superabsorbent polymers have the prospect of preventing water evaporation because of its excellent water absorbency. However, insufficient in salt resistance, water retention, and swelling rate limit its application. Herein, we fabricated Hydroxyethyl cellulose-g-(Acrylic acid-co-2-Acrylamido-2-methyl-1-propane sulfonic acid)/laterite (HEC-g-P (AA-co-AMPS)/laterite) with exceptional abovementioned performances by aqueous solution polymerization. Under optimal synthesis conditions, the water absorbency of the superabsorbent polymer were 1294 g/g, 177 g/g, and 119 g/g in distilled water, tap water, and 0.9 wt% NaCl solution, respectively. The water retention of the superabsorbent polymer was still as high as 97.7% after 16 h at 25 ℃, the water absorbency was up to 832 g/g after re-swelling for 5 times at 40 ℃, and the water absorption reached swelling equilibrium was only 5 min. We investigated the effect of the mount of swollen hydrogel on the water evaporation rate in soil, and the results showed that hydrogels were effective in inhibiting soil water evaporation. Our study provides a new horizon for the application of superabsorbent polymer.
研究领域:
材料科学
·
环境科学
·
农业科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Xiujuan Zhao,Yangyang Luo,Peixin Tan,Mingxian Liu,Changren Zhou
A high-performance oil-water separation device that built by environment-friendly materials is a promising strategy to solve water pollution problem. In this study, we developed an oil-water separation system with chitin/halloysite nanotubes (C/HNTs) composites. C/HNTs were crosslinked by epichlorohydrin and freeze-dried, then a porous sponge was formed. The C/HNTs sponge was modified to be hydrophobic via immersing into bromohexadecane ethanol solution. The surface structure, mechanical properties, microstructure, oil absorption and oil-water separation ability of the C/HNTs sponge were investigated. The addition of HNTs significantly increased the compressive strength of chitin sponge without influence on porous structure . IR spectra indicated the successful coating of bromohexadecane on the C/HNTs sponge surface, which enabled the hydrophobicity and lipophilicity of this construct. The inside construct of the C/HNTs sponges were full of interconnected pores, and the pore size ranged from 250 to 500 μm. The absorption capability for various oil and grease were measured, including methylbenzene, sunflower seed oil , carbon dichloride, n-hexane, chloroform and acetone. It is found that the total amount of chloroform absorbed by a C/HNTs sponge was ~11.23 times of the sponge's weight, and the absorption for hexane was ~3.94 times of the sponge's weight. The sponge also exhibited an excellent oil-water separation ability with as high as 98.7% separation efficiency. All the results suggested that the chitin/HNTs sponges with improved mechanical property would have a great potential in oil-water separation.
研究领域:
材料科学
·
环境工程
·
高分子化学
·
纳米复合材料
·
分离技术
✓ 已验证
DOI
高影响因子
CEMENT & CONCRETE COMPOSITES
·
2022
·
IF 9.93
Yangyang Zhang,Jun Chang,Qingxin Zhao,Wing Lun Lam,Peiliang Shen,Yanjie Sun,Dahai Zhao,Chi Sun Poon
Seawater and sea-sand based ultra-high performance concrete (UHPC) is currently regarded as one of the most innovative and promising construction materials. To provide design guidance for the usage of silica fume (SF) during the production of seawater and sea-sand based UHPC, this work investigated the effect of SF on the later-age macro-performances and micro/nanostructure of seawater ordinary Portland cement (OPC) pastes prepared with a low water-to-binder (W/B) ratio. The results showed that the optimal SF dosage in seawater OPC-SF system was 10 wt% while that for the deionized (DI) water OPC-SF system was 20 wt%. This showed that the usage of SF could be reduced for the production of the seawater based UHPC system. It was found that the later-age compressive strength of seawater OPC-SF system was increasingly degraded with increasing SF dosage when compared with the corresponding DI water OPC-SF system. The difference in the distribution of unhydrated clinkers in the matrix as SF addition increased was the main cause. The seawater OPC-10%SF system exhibited the highest compressive strength and the lowest pore content among all the seawater-OPC systems. Additionally, with the usage of this ultra-low W/B ratio, Friedel's salt was only present in the seawater OPC pastes prepared without SF, but absent in the seawater OPC-SF pastes.
研究领域:
建筑材料
·
水泥基材料
·
混凝土耐久性
·
纳米结构表征
·
海洋工程材料
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xi Zhao,Yingying Chen,Yue Yin,Liqing Zou,Qiyang Chen,Kai Liu,Pengcheng Lin,Hua Su,Ying Chen
The state-of-the-art solar-thermal evaporators demonstrating high energy utilization efficiency, a high evaporation rate, and salt rejection are highly desirable in solar-driven low-energy water purification/harvesting. Herein, a novel Janus solar evaporator is constructed by loading polypyrrole (PPy) nanobelts on the polyvinyl alcohol (PVA) hydrogel. The PPy nanobelts present a high solar absorption of 98.3%, leading to a localized solar-thermal efficiency of 82.5% when insulated from bulk water by the PVA hydrogel. The porous PVA hydrogel and the hydrophilic PPy nanobelts enable the efficient three-dimensional water transport. Taking advantages of the synergistic effect in the water-energy nexus, the Janus PPy nanobelt@PVA hydrogel evaporator evaporates water with a high rate of 2.26 kg m–2 h–1 via 80.1% solar energy from 1 sun irradiance with a low PPy loading of ∼3 mg cm–2 even at a rate of 2.64 kg m–2 h–1 via 96.3% solar energy for a biomimetic conical evaporator. The Janus evaporator presents superior salt-resistant desalination and contaminant purification performance in seawater and sewage. Furthermore, a portable solar-thermal purifier equipped with the Janus evaporator desalts real seawater far above the drinking water standard with over a 99.9% salt rejection rate and eliminates 95.8% of chemical oxygen demand in real sewage, highlighting its potential for advanced clean water harvesting.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Runan Gong,Han Cao,Hongming Zhang,Lijun Qiao,Xianhong Wang
Though cationic waterborne polyurethane (CWPU) has been regarded as an important environmental friendly material, it is hampered by poor water resistance due to incorporation of excessive hydrophilic groups to assure the stability of water dispersion. Here UV-curing in combination with terminal hydrophilicity induced dispersion strategy was employed to prepare water-resistant CWPU from CO 2 -polyol which was an oligoethercarbonate diol from telomerization of propylene oxide and CO 2 . In this system, multiple vinyl ether side chains were incorporated on CWPU backbone using 3-allyloxy-1,2-propanediol as functional chain extender to achieve efficient UV curing, and a small amount of terminal hydrophilicity was designed to ensure the stable dispersion of CWPU. The typical UV-cured CWPU film reached water absorption equilibrium at 72 h, maintaining water absorption rate as low as Ca . 5.8% even immersed in water for 240 h. Moreover, compared with traditional polyester and polyether polyols from petroleum resources, UV-cured CWPU from CO 2 -polyol not only used partially sustainable raw material like CO 2 , but also provided excellent water resistance in corrosive media for a long time (tensile strength retention above 90% for 336 h) due to hydrolysis resistant structure like carbonate and ether units in CO 2 -polyol.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Advanced Sustainable Systems
·
2023
·Vol. 8
·期 2
·2300331
·
IF 7.1
Cailing Yang,Wenxu Zhang,Rongnian Xu,Huaiwu Peng,Zhenshi Zhang,Xiaomei Liu,Li Li,Tingli Li,Jing Li,Pengbo Liu,Xinlu Jin,Yuanyuan Ma,Ziqiang Lei
Modified MIL-101(Al)-NH 2 (MIL-101(Al)-NH 2 -net) is used as a crosslinking agent and acrylic acid (AA) as a monomer, the MIL-101(Al)-NH 2 -net grafted polyacrylic acid (MIL-101(Al)-NH 2 -net-g-PAA (MAP)) composite water-absorbent material is synthesized using the free radical polymerization method to study the application of composite absorbent materials in water collection. The structure and morphology of the composite water-absorbent material are characterized using Fourier transform infrared spectrometry (FTIR), scanning electron microscope (SEM), transmission electron microscope (TEM), Brunauer Emmett Teller (BET), and thermogravimetric analysis (TG), and the contents of ammonium persulfate (APS), MIL-101(Al)-NH 2 -net, and neutralization degree of AA are optimized. Under optimal conditions, the water absorption ratios of the composite materials in distilled water, tap water, and 0.9% NaCl solution are 744, 169.5, and 85.5 g g −1 . In addition, the properties of collecting water vapor are investigated. At 25 °C, 50% Relative Humidity (RH), 70% RH, and 90% RH, the MAP water vapor adsorption capacity is 0.0312, 0.5760, and 1.6856 g g −1 , respectively. The water vapor adsorption of MIL-101(Al)-NH 2 and MIL-101(Al)-NH 2 self-polymerization products are 0.025 and 0.1278 g g −1 , respectively. The result showed that autopolymerization can improve the water vapor adsorption performance.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
MATERIALS AND STRUCTURES
·
2022
·Vol. 55
·期 6
·1-15
·
IF 4.285
Zhang Yangyang,Sun Yanjie,Shen Peiliang,Lu Jianxin,Cai Yamei,Poon Chi Sun
The direct use of both seawater and sea sand in concrete production has been becoming attractive for some marine and coastal engineering where the availabilities of freshwater and river sand are limited. To further expand the use of seawater (e.g., using seawater as both mixing and curing water), this work provided fundamental research regarding the effects of using seawater as the mixing and curing water on the physicochemical properties of Portland cement pastes. The sub-samples at different depths of the seawater mixing and curing samples were extracted and separately analyzed. The chemical changes were quantitatively investigated, and the relation between the physical behaviors and the chemical changes was studied. The results showed that in the outer region of the samples, the ettringite content was significantly increased, but the content of Friedel’s salt was slightly reduced. Moreover, a large amount of calcium hydroxide was dissolved, but correspondingly, magnesium hydroxide (MH) crystals with various particle sizes were formed. Also, the sodium ions in the seawater were incorporated into the structure of calcium silicate hydrate gel, resulting in the formation of silica dimers with a shorter silica chain and the increase of nanopore volume (increasing by 22% in the inner region and 36% in the outer region). In addition, seawater increased the ion transport rate, but the blocking effect of the MH crystals on the samples largely decreased the rate. The changes in the crystalline and amorphous hydration products potentially influenced the strength development.
研究领域:
材料科学
·
建筑材料
·
水泥化学
·
海洋工程
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2019
·
IF 4.978
Atian Xie,Jiuyun Cui,Yangyang Chen,Jihui Lang,Chunxiang Li,Yongsheng Yan,Jiangdong Dai
Realization of fast, efficient and continuous oil–water separation is of great significance for solving the problem of oil pollution. We present here a facile hydrothermal strategy to synthesize a superhydrophilic platanus fruit-like Ni@Ni(OH) 2 hierarchical architecture (SI-PFHA). Additionally, superhydrophobic platanus fruit-like Ni@Ni(OH) 2 hierarchical architecture (SO-PFHA) is obtained through stearic acid modification of SI-PFHA. Dual-channel separation system is integrated based on two superwetting membranes. Such separation system is competent for continuous light/heavy oil–water separation with high flux and high separation efficiency. Importantly, outstanding durability and reusability make this separation system a promising strategy for practical application in remediation of oily wastewater.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 27
·期 2
·915-925
·
IF 3.917
Dai Lei,Cheng Ting,Xi Xiangju,Nie Shuangxi,Ke Huizhen,Liu Yishan,Tong Shuhua,Chen Zhirong
Abstract Water pollution caused by industrial discharges is a severe threat to our society. Thus, efficient and sustainable materials that can provide potential effective solutions are in high demand. The present work reports the development of a versatile strategy based on TEMPO-oxidized cellulose nanofibers (TOCN)/cationic guar gum (CGG) self-assembling hydrogels to remedy wastewater containing oil, heavy metal ions or organic dyes. The TOCN/CGG hydrogel-coated filter papers, prepared via a layer-by-layer deposition process, show a high oil/water separation efficiency (around 99%), with the coating amount of being as low as 0.032 g m −2 (dry mass). Through gravitational force only, the water flux can be as high as 443 L m −2 h −1 . The as-prepared oil/water separation materials exhibited good recyclability. The monolithic TOCN/CGG hydrogel can also efficiently remove copper ions (Cu 2+ ) and dyes (i.e. thioflavin T and methyl orange), based on an adsorption mechanism. The adsorption amount of Cu 2+ can be as high as 498.5 mg g −1 , while that of thioflavin T and methyl orange can be 430.2 mg g −1 and 134.3 mg g −1 , respectively. The mass transfer driving force and the number of active binding sites are the two main factors affecting the adsorption process. This all-polysaccharide hydrogel system may be a promising potential for wastewater remedy, due to its facile/“green” preparation process and high performance, as well as the abundance and environmental-friendliness of its raw materials. Graphic abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）