Materials
·
2023
·Vol. 16
·期 4
·1620
·
IF 3.4
Yihong Zhang,Yong Wu,Puyu Zhou,Zhiyuan Song,Yayun Jia,Weiyi Ouyang,Rafael Luque,Yang Sun
Aluminum sulfate was employed as the main accelerator in order to explore new non-chloride and alkali-free cement accelerators. Acrylic acid, aluminum fluoride, or alkanolamine were used as regulators to further accelerate cement setting. The setting time, compressive, and flexural strengths in cement early strength progress were detected, and both the cement (raw material) and hydrated mortar were fully characterized. The cement setting experiments revealed that only loading acrylic acid as the regulator would decrease the setting time of cement and increase the compressive and flexural strengths of mortar, but further introduction of aluminum fluoride or alkanolamine improved this process drastically. In the meantime, structural characterizations indicated that the raw material (cement) used in this work was composed of C3S (alite), while hydrated mortar consisted of quartz and C3A (tricalcium aluminate). During this transformation, the coordination polyhedron of Al3+was changed from a tetrahedron to octahedron. This work puts forward a significant strategy for promoting the activity of aluminum sulfate in cement setting and would contribute to the future design of new non-chloride and alkali-free cement accelerators.Keywords:aluminum sulfate;accelerator;setting time;mortar;strength
研究领域:
材料科学
·
土木工程
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产品关联
DOI
PubMed
高影响因子
Separations
·
2025
·Vol. 12
·期 7
·179
·
IF 2.7
Jie Wang,Meiyi Hu,Ziyi Zhang,Shaoping Tong
The widespread use of plastics in our daily life has caused many health problems. Conventional water treatment processes have low efficiency in the removal of microplastics from water. In this work, we investigated the efficiency of ozonation pretreatment followed by flocculation to remove microplastics from water. After the ozonation pretreatment, it was found that microplastic removal could be significantly enhanced by flocculation from 40% to 91%. The characterization results show that the ozonation-pretreated microplastics had rougher surfaces and larger amounts of surface hydroxyl groups and carbonyls, which might be responsible for their increased removal. However, there was still a small amount of microplastics that had not been removed. They floated on the surface of the solution and could not be effectively oxidized by ozone, thus not changing their surface properties. This further confirms the importance of hydroxyl groups.
研究领域:
环境科学
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水处理
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材料科学
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 9
·2027
·
IF 4.2
Huabin Jiang,Jiaqi Nie,Lei Zeng,Fei Zhu,Zhongwang Gao,Aiping Zhang,Jun Xie,Yong Chen
Hemicellulose can be selectively removed by acid pretreatment. In this study, selective removal of hemicellulose was achieved using dilute sulfuric acid assisted by aluminum sulfate pretreatment. The optimal pretreatment conditions were 160 °C, 1.5 wt% aluminum sulfate, 0.7 wt% dilute sulfuric acid, and 40 min. A component analysis showed that the removal rate of hemicellulose and lignin reached 98.05% and 9.01%, respectively, which indicated that hemicellulose was removed with high selectivity by dilute sulfuric acid assisted by aluminum sulfate pretreatment. Structural characterizations (SEM, FTIR, BET, TGA, and XRD) showed that pretreatment changed the roughness, crystallinity, pore size, and functional groups of corn straw, which was beneficial to improve the efficiency of enzymatic hydrolysis. This study provides a new approach for the high-selectivity separation of hemicellulose, thereby offering novel insights for its subsequent high-value utilization.
研究领域:
生物化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 6
·3013-3023
·
IF 4.21
Shen Feng,Sun Shuang,Zhang Xiao,Yang Jirui,Qiu Mo,Qi Xinhua
Abstract Direct production of the platform chemical 5-hydroxymethylfurfural (5-HMF) from cellulose is challenging due to the rigid structure of cellulose. Herein, 5-HMF was effectively obtained from cellulose with high loading concentrations (> 20 wt.%) via an Al 2 (SO 4 ) 3 -assisted mechanochemical method. The Al 2 (SO 4 ) 3 not only acted as catalyst for its Lewis and Brønsted acidity, but also assisted the disruption of the hydrogen bonds among cellulose molecules during ball milling pretreatment. The particle size and crystallinity of the cellulose greatly decreased after Al 2 (SO 4 ) 3 -assisted ball milling pretreatment. The effects of various factors, including the organic solvent, reaction temperature and time, catalyst dose, and substrate concentration, on the yield of 5-HMF from cellulose were studied. A yield of 5-HMF up to 43.5% was obtained from cellulose via the developed mechanochemical-assisted method. A 36.1% yield of 5-HMF was retained when the initial cellulose loading concentration was as high as 21.6 wt.%. The green and efficient mechanochemical-assisted method was applicable to the efficient coproduction of 5-HMF and furfural from several waste biomass feedstocks.
Graphic abstract
研究领域:
化学工程
·
可再生资源利用
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2023
·Vol. 76
·期 3
·1467-1476
·
IF 2.6
Xia Chengcheng,Liu Zhanwei,Yan Hengwei,Liu Qiang,Li Mengnan,Lan Jinghao
Spent anodes (butts) are the remaining portion of prebaked anodes after consumption, which are reintroduced into the production of prebaked anodes after treatment. Among these residues, the main harmful element, sodium, tends to accumulate with the repeated recycling of the butts. This accumulation increases the air reactivity of prebaked anodes and consequently reduces their quality. In this study, aluminum sulfate hydrothermal acid leaching was used to remove sodium from the butts. The effects of leaching temperature, Al 3+ concentration, leaching time, and liquid-to-solid ratio on the removal of sodium from the butts were investigated. The sodium removal rate reached 99.42% at a leaching temperature of 90°C, an Al 3+ concentration of 1.5 mol/L, a leaching time of 2.5 h, and a liquid-to-solid ratio of 25 mL/g. This method significantly reduced the sodium content in the butts, offering a new approach for the high-quality recovery of the butts.
研究领域:
冶金工程
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环境科学
✓ 已验证
DOI
高影响因子
Biomass Conversion and Biorefinery
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2025
·
IF 4.1
Jia Yu,Liang Xuanyu,Tao Hongge,Chen Binglin,He Chao,Jiao Youzhou,Xu Guizhuan
5-Hydroxymethylfurfural (HMF) is an important platform compound that can be used to synthesize drugs, fine chemicals, fuels, and biodegradable plastics. Synthesis of HMF from cellulose is a key step in the production of high-value-added chemicals and fuels from renewable cellulosic biomass. Herein, a cheap way to produce HMF from cellulose was found in this study. Combination of inexpensive metal salts and inorganic acids shows exciting catalytic efficiency in tetrahydrofuran (THF)/H 2 O system. In this article, the effects of key factors such as water/organic solvent ratio, metal salt type, and concentration on the synthesis of HMF from cellulose were investigated. A maximum HMF yield of 46.5% was obtained with high substrate loading (50 g/L) when H 2 SO 4 and Al 2 (SO 4 ) 3 was used as mixed acid catalysts. Reaction kinetics experiments revealed that combination of H 2 SO 4 and Al 2 (SO 4 ) 3 could effectively reduce the activation energy of cellulose hydrolysis, glucose isomerization, and fructose dehydration compared to the single H 2 SO 4 and single Al 2 (SO 4 ) 3 system. Fortunately, the purity of HMF after separation and purification was up to 98.3%, and both the solvent and the extractant can be recycled. A promising strategy is provided for HMF production from cellulose over simple catalysts.
研究领域:
生物化学
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可再生资源化工
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2015
·
IF 2.752
Bo Guo,Huan Yu,Baoyu Gao,Hongyan Rong,Hongyu Dong,Defang Ma,Ruihua Li,Shuang Zhao
In this study, novel cationic polyamidine (Pa) was synthesized and used as coagulant aid with aluminum sulfate (AS) for kaolin-humic acid simulated water treatment. The effects of Pa on coagulation performance and floc properties were investigated. Results showed that Pa addition significantly enhanced the removal of turbidity, ultraviolet absorbance at 254 nm wavelength (UV 254 ) and dissolved organic carbon (DOC). AS–Pa exhibited high coagulation efficiency at border pH range and increased floc size and growth rate significantly. Floc recovery ability was also improved, while floc fractal dimension was lower with Pa addition. This would be attributed to high cationic charge density and long chain of Pa, which could enhance the effect of charge neutralization and adsorption bridging.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2021
·
IF 6.789
Yanting Dong,Yanwen Shen,Dongdong Ge,Chang Bian,Haiping Yuan,Nanwen Zhu
Sludge dewatering is necessary to reduce the volume of sludge for cost-effective transport and ultimate disposal. In this study, a novel combined chemical conditioning process was proposed to improve sludge dewatering performance in which sludge flocs were destructed by sodium dichloroisocyanurate (DCCNa) and re-flocculated by Al 2 (SO 4 ) 3 and the mechanism was elucidated. The results showed that sludge capillary suction time (CST) dropped to 15.4 s and moisture content of dewatered sludge cake (Mc) deceased to 71.01% respectively, after the application of combined conditioning with the optimal dosage of 200 mg DCCNa/g dry solids (DS) and 80 mg Al 2 (SO 4 ) 3 /g DS. With chemical conditioning, sludge physicochemical properties were greatly changed. With the DCCNa application, the percentage of low-molecular-weight substances in soluble extracellular polymeric substances (S-EPS) increased. Also, the sludge zeta potential dropped from −16.85 mV to −25.45 mV and the median particle size (D50) decreased from 54.1 μm to 51.6 μm. However, the subsequent conditioning by Al 2 (SO 4 ) 3 dosing not only led to an increment of 18% in the portion of macromolecules in S-EPS, but also increased the zeta potential and D50 to −10.74 mV and 53.2 μm, respectively. The bound water content in sludge declined from 2.92 g/g DS to 1.98 g/g DS after combined conditioning. We concluded that DCCNa disintegrated the sludge flocs and microbial cells leading to the release of bound water, fine particles and organic substances with negative charge, and the fine colloidal particles can be flocculated into large dense aggregations with the dosing of Al 2 (SO 4 ) 3 . In summary, the proposed combined conditioning provided a highly effective and environmental friendly approach to improve the sludge dewatering performance.
研究领域:
环境科学
·
污水处理
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Ning Wang,Zhenghe Xu,Weiying Xu,Jing Xu,Yingying Chen,Min Zhang
Removals of salicylic acid (SA) and humic acid (HA) in individual and bi-component systems by coagulation employing aluminum sulfate (alum) and adsorption using magnetic chitosan (MCS), were comparatively investigated in this study. In single-component system, alum at sufficient dose (12.0 mg/L), although efficient in removing HA, was not desirable in removal of SA. Conversely, higher SA removal rate in the adsorption process was achieved due to its superior adsorption tendencies and size-exclusion effects than that of HA. Moreover, individual SA/HA by MCS adsorption fit with Freundlich isotherm model, indicating a multilayer adsorption process. In the bi-component system, the SA and HA removal rates were observed to decrease to varying extents. Dynamic floc sizes during coagulation processes were studied using a laser diffraction particle sizing device. The results demonstrated high molecular weight (MW) HA-Al(III) complex could grow into enough large size and consequently tended to separate in water; while more coagulants (>14.0 mg/L) were required in the bi-component system compared with individual HA water when the system emerged obvious flocs, which was associated with the discrepancy of charge neutralization and competition of adsorption sites. For sole adsorption, the reaction between HA and MCS was faster than that of SA, and parts of adsorption sites were preoccupied by HA and thereby result in the low SA removal efficiency. Furthermore, combination of alum and MCS could significantly enhance organic matter removal, and alum with low dose of 8.0 mg/L coupled with MCS could evidently improve flocs settlement performance and increase the floc sizes.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Zhengyang Chen,Jiangmin Li,Jiajia Yu,Lei Wu,Shengquan Zhou,Yanzhao Rao,Jing Cao
Aluminum sulfate is inexpensive, non-toxic and non-hazardous and has the potential to become an ideal electrolyte additive for lead-acid batteries. This paper investigates in depth on the effect of electrolyte additives in lead-acid batteries under high rate charging and discharging conditions. This research work proves that aluminum sulfate in the electrolyte can affect the rapid accumulation of lead sulfate formation and growth in high rate charging and discharging process and then significantly inhibit sulfation, which reduces the internal resistance of the electrode plate and substantially improves the electrochemical performance of the battery . The high-rate partial charge state (1C charging and discharging rate) cycle (HRPSoC) life (8003 times) of the battery with aluminum sulfate additive is 13 times that of the blank battery. The battery test results show that the battery has excellent performance in charge acceptance test and constant voltage and constant current polarization test. We also found aluminum sulfate could repair the spent batteries effectively.
研究领域:
材料科学
·
电化学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 4
·283
·
IF 4.3
Zhiyuan Song,Sidra Chaudhary,Zainab Bibi,Yong Wu,Qinxiang Jia,Xiaoyong Li,Yang Sun
Two hydrophilic copolymers containing functional groups such as carboxyl, amido, and sulfonic acid are synthesized using ammonium persulfate-catalyzed free radical polymerization in water. Aluminum sulfate is then introduced, resulting in two polymer complexes that exhibit reduced cement setting times (initial, 1.16–2.44 min; final, 2.02–3.14 min) and improved compressive (24 h, 5.81–7.25 MPa) and flexural (24 h, 2.80–2.99 MPa) strengths compared to pure aluminum sulfate-facilitated cementing (initial, 19.11 min; final, 37.05 min; compressive, 24 h, 5.51 MPa; flexural, 24 h, 2.56 MPa). Following this, ball-milled illite powder is added, and the resulting admixtures further display slightly prolonged setting times (initial, 2.35–2.99 vs. 1.16–2.44 min; final, 3.98–4.35 vs. 2.02–3.14 min), along with comparable compressive strengths (5.85–7.11 vs. 5.81–7.25 MPa) and enhanced flexural strengths (3.92–5.83 vs. 2.80–2.99 MPa). Notably, a unique adhesive pozzolanic clinker, Ca54MgAl2Si16O90(54CaO·MgO·Al2O3·16SiO2), emerges in the presence of illite-based admixtures, contributing to the mechanical strength development of the hydrated mortars. Although illite itself is hydrophobic, the coating of ball-milled illite powder with aluminum sulfate and copolymers facilitates its dispersion into the gaps and pores of the cement matrix during setting, thereby increasing the flexural strength. This work presents an interesting approach to utilizing illite materials in cement applications, which is significant for reducing CO2emissions during cement production and use.
研究领域:
材料科学
·
土木工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 15
·51925
·
IF 3.125
Chunhui Luo,Min Huang,Hongmin Liu
Conductive hydrogels have drawn increasing attention, but their applications are severely hindered due to insufficient sensitivities at tiny strains and poor recovery ratio upon external loads. Herein, a poly(vinyl alcohol)/aluminum sulfate composite hydrogel (T-PVA-Al) was designed to address this issue by introducing aluminum sulfate into poly(vinyl alcohol) aqueous solution, followed with three freezing–thawing cycles. The triply dynamic knots (hydrogen bonds, crystalline regions, and coordination interactions) worked in tandem to achieve high resilience (94% recovery ratio after 100 cycles) and fatigue resistance. Remarkably, the introduction of the immobile Al 3+ cation and free sulfate (SO 4 2− ) anion endowed the T-PVA-Al hydrogel with outstanding sensitivity (a gauge factor=13.9, at 0.2% strain). It could precisely and quickly monitor external stress as low as 0.5 kPa, superior to most conductive hydrogels. Notably, the hydrogel sensor possessed the capacity to precisely and reliably detect subtle variations, for example, gentle finger touching, making it an ideal candidate for human-motion detections, artificial skins, and wearable devices.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）