JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Rui-Zhi Cui
The experimental solubility of LiCl–Li 2 SO 4 –MgCl 2 –MgSO 4 –H 2 O and KCl–K 2 SO 4 –MgCl 2 –MgSO 4 –H 2 O systems was measured at 288.15 K. The corresponding stable phase diagrams and water content diagrams were plotted by experimental results. Double salt was formed in both two systems. There are six phase fields, nine univariant solution curves and four invariant points in the phase diagram of LiCl–Li 2 SO 4 –MgCl 2 –MgSO 4 –H 2 O system. And the diagram of another system has seven invariant points and eight crystallization regions. By using multiple linear regression method, parameter Ψ Li,Cl,SO4 and the solubility equilibrium constants of double salt KCl·MgSO 4 ·3H 2 O were obtained by solubility data fitting at 288.15 K. The equilibrium solubility of salts in above systems at the same temperature was predicted with Pitzer's electrolyte solution model and mathematical calculation software. The results indicate that the predicted data are in correspondence with experiments.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
·
2025
·
IF 4.4
Peng Feng,Donghai Xu,Kunkun Song,Gang Yin,Guanyu Jiang,Yang Yang,Yaling He
Supercritical water oxidation efficiently degrades organic waste but faces challenges from salt deposition due to the low solubilities of salts in supercritical water (SCW). This study investigated the characteristics and mechanisms of dissolution and deposition of mixed sulfate and chloride salts in SCW. At low water densities the common ion effect was observed in Na 2 SO 4 /K 2 SO 4 mixtures. Na + tended to occupy the junctions between SO 4 2- , while K + tended to occupy the cluster endings. Due to the weaker electrostatic interaction between K + (with larger ionic radius) and SO 4 2- , large and medium-sized clusters were more prone to decomposition in K + -rich solutions. K 2 SO 4 induced a “salting-in” effect on Na 2 SO 4 , whereas Na 2 SO 4 exerted a “salting-out” effect on K 2 SO 4 at high water densities. Both sulfates exhibited heterogeneous nucleation, depositing on heated sidewalls as nucleation sites, with Na 2 SO 4 proving more difficult to remove than K 2 SO 4 . In KCl/Na 2 SO 4 mixtures, homogeneously nucleated chloride salts created many preferential nucleation sites for Na 2 SO 4 deposition.
研究领域:
化学工程
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物理化学
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环境科学
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材料科学
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热力学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Nian He,Dailiu Hu,Honglong Xie,Zongjin Wu,Zili Wang,E. Yang,Ruiying Cao,Hongyan Pan,Qian Lin,Zheng Chen
Despite the widespread utilization of phosphoric acid (PPA) as an activator in the preparation of biomass-derived porous carbon materials, limited research has focused on utilizing recycled phosphoric acid (RPPA) for this purpose. Here, we revealed the in situ morphological transformation of phosphorus and its influence on the mechanism of porosity development in porous carbon materials. Furthermore, we examined the pore structure distribution, morphology, surface properties of the resulting carbon materials, as well as the influence of these properties on the adsorption behavior of tetracycline hydrochloride (TC). The abundant presence of a substantial quantity of polyphosphoric acid and polyphosphates in RPPA significantly contribute to the formation of a highly mesoporous structure in AC-R, achieving a mesopore volume of up to 0.65 cm 3 /g, which is larger than that of AC-N (0.23 cm 3 /g). This displays a molecular-level strategy that can adjust pore structure by regulating the type and content of polyphosphoric acid and polyphosphate during the one-step activation process, providing theoretical guidance for regulating pore structure of porous carbon materials. Moreover, AC-R exhibited effective TC uptake of 523.63 mg/g through pore adsorption, electrostatic interaction, metal ion complexation, hydrogen bonding, and π-π stacking interactions, showing comparable adsorption performance to AC-N (520.92 mg/g).
研究领域:
材料科学
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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
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 17
·24704-24715
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IF 4.223
Chen Yue,Shi Yahui,Wan Dongjin,Zhao Jihong,He Qiaochong,Liu Yongde
At present, tetracycline hydrochloride (TCH) is a widely used antibiotic, and is often detected in water, posing a serious harm to human and ecological health. In this study, spent bleaching earth (SBE) was pyrolyzed to obtain spent bleaching earth carbon (SBE@C) and the nano Fe 0 /SBE@C prepared after zero-valent iron loading was adopted to remove TCH in water for the first time. The combination of nano Fe 0 /SBE@C and PS, the strong adsorption of SBE@C coupled with the oxidation of free radicals could achieve TCH efficient removal. The effects of nano Fe 0 load, nano Fe 0 /SBE@C dosage, solution initial pH, and PS/TCH molar ratio on TCH removal efficiency in nano Fe 0 /SBE@C + PS system were studied. The results indicate that the optimal reaction conditions are 5% nano Fe 0 load, 0.2 g/L nano Fe 0 /SBE@C dosage, initial pH of 3, PS/TCH molar ratio of 100:1. Under these conditions, TCH removal efficiency could reach 91%. Meanwhile, response surface methodology (RSM) was applied to predict optimal value of reaction conditions. The removal efficiency corresponding to the predicted optimal conditions was consistent with the actual removal efficiency obtained from the experiment. Moreover, six reaction systems were tested, and TCH removal efficiency in the SBE@C + PS system was 22.6%. When nano Fe 0 was loaded on SBE@C, TCH removal efficiency in Fe 0 /SBE@C + PS system increased to 78.2%, in which TCH was first adsorbed on the surface of nano Fe 0 /SBE@C, and then was degraded by the oxidation of SO 4 •− and •OH. Totally, the nano Fe 0 /SBE@C + PS system displayed excellent TCH removal efficiency, good stability and reusability, exhibiting a promise toward TCH removal.
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
CHEMICAL PHYSICS LETTERS
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2025
·
IF 3.1
Simin Li,Ziran Chang,Fengbing Tang,Tianshuo Sui,Lemin Li,Jingbo Mu,Zhennan Shi
The QS@PDA/Co-Mn-ZIF catalyst, synthesized using quartz sand as a base material, effectively degrades TCH through the activation of PMS. The Co-Mn-ZIF component activates PMS, while PDA ensures the adhesion of ZIF to quartz, facilitating catalyst recovery. This design enhances electron transport and metal ion redox reactions, generating reactive species that degrade TCH. It achieves a 94 % TCH removal rate from a 100 mg/L solution within 40 min, demonstrating stability under various pH and water conditions. The catalytic mechanism was elucidated·through radical trapping experiments and electron paramagnetic resonance analysis. QS@PDA/Co-Mn-ZIF shows great potential for treating recalcitrant and high-concentration organic wastewater.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Xiao-lei Wang,Wei Qin,Li-xin Wang,Kong-yin Zhao,Hui-cai Wang,Hong-yu Liu,Jun-fu Wei
In order to recover dyes from textile wastewater, a self-supported carboxylated titanium dioxide/calcium alginate (TiO 2 -COOH/CaAlg) hydrogel nanofiltration membrane was prepared using TiO 2 -COOH as the reinforcing agent. The Scanning electron microscopy (SEM) and Energy dispersive X-ray (EDX) mapping scanning spectra were employed to characterize the distribution of TiO 2 -COOH nanoparticles on the membrane surface. The pore size distribution, zeta potential and mechanical performance of the membrane were evaluated. The rejections for single dye solutions, salt solutions and dye/salt mixture solutions were also examined. The results indicate that the TiO 2 -COOH nanoparticles are dispersed uniformly on the membrane surface. Compared to CaAlg membrane, the tensile strength of 20 wt% TiO 2 -COOH/CaAlg membrane is enhanced by 328%. At the operating pressure of 0.1 MPa, the rejection ratios of 20 wt% TiO 2 -COOH/CaAlg membrane for 100 mg/L Brilliant blue G250, Direct black 38 and Congo red are 98.4%, 96.8% and 95.9% respectively, and the permeate flux is about 14.1 L·m −2 ·h −1 . Meanwhile, this membrane possesses the low rejection ratios for inorganic salts (16.1%, 15.6%, 12.3% and 9.0% for MgSO 4 , Na 2 SO 4 , MgCl 2 and NaCl, respectively), excellent dye anti-fouling property and good stability in the long-term filtration for dye/salt mixture solution.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Peng Feng,Donghai Xu,Youwei Zhi,Bing He,Shuzhong Wang,Yaling He,Yang Guo
This work aims to explore the ability of molten salt to solve salt deposition in supercritical water (SCW) related technologies including supercritical water oxidation and supercritical water gasification, with KNO 3 and Na 2 SO 4 as examples. In the pure KNO 3 solution, the two-phase layering of high-density KNO 3 molten salt (settling at the reactor bottom) and low-density saturated KNO 3 -SCW salt solution (flowing out at the top outlet of the reactor) was formed in a kettle-reactor with about 6.5 ratio of depth to inner diameter, thereby improving the accuracy of measured solubilities. The precipitation macro-characteristics of mixed KNO 3 and Na 2 SO 4 in SCW were investigated under different feed concentration conditions. The results showed that Na 2 SO 4 deposition on the reactor sidewall could be reduced by more than 90 % when the mass ratio of KNO 3 to Na 2 SO 4 in the feed was only 0.167. No visible salt deposition was observed on the sidewall when the ratio was 0.374. All solid deposited salts were converted into the liquid molten salt as the ratio reached 3.341, and thus could easily flow out of the reactor, without plugging. ‘Molten salt dissolution’ mechanism may provide a more plausible explanation for mixed KNO 3 and Na 2 SO 4 in SCW. In addition, the precipitation micro-mechanisms of mixed KNO 3 and Na 2 SO 4 , and the critical conditions of avoiding sidewall deposition and reactor plugging were proposed. This work is valuable for overcoming the salt deposition problem in SCW-related technologies.
研究领域:
化学工程
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环境科学
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超临界流体技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2017
·
IF 3.743
Xiaofeng Yi,Jiarui He,Yingyuan Guo,Zhenhua Han,Meixia Yang,Jiali Jin,Junjie Gu,Minrui Ou,Xiaoping Xu
The aim of this work was to study the removal of Cu (II) and U (VI) ions from aqueous solutions by encapsulating magnetic Fe 3 O 4 nanoparticles into calcium alginate coated chitosan hydrochloride (CCM) hydrogel beads. ATR-FTIR and XRD analysis data indicated that the CCM composites were successfully prepared. SEM images and EDX spectra showed that Cu 2+ and UO 2 2+ ions were adhered onto sorbents . Adsorption properties for removal of both copper and uranium ions under various experimental conditions were investigated. Kinetic data and sorption equilibrium isotherms were also conducted in batch process . The sorption kinetic analysis revealed that sorption of Cu (II) and U (VI) followed the pseudo-second-order model well and exhibited 3-stage intraparticle diffusion model during the whole sorption process. Equilibrium data were best described by Langmuir model, and the CCM composite hydrogel beads showed the estimated maximum adsorption capacity 143.276 mg/g and 392.692 mg/g for Cu (II) and U (VI), respectively. The CCM adsorbent exhibited excellent reusability for five cycles use without significant changes in the adsorption capacity and structural stability. The results demonstrated that CCM can be an effective and promising sorbent for Cu (II) and U (VI) ions in 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
PubMed
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Bo Xian,Wei Tang,Dongfang Xiang,Chenyang Rao,Xiaying Liu,Fang Fang,Fuhao Chu,Tao Fang
In this study, Microcystis aeruginosa was effectively transformed into high-surface-area biochar using four different organic potassium salts as activators, achieving a maximum specific surface area of 2933 m 2 ·g −1 . The resulting biochar exhibited an outstanding adsorption capacity for tetracycline hydrochloride, reaching up to 969.9 mg·g −1 . Our findings reveal that a higher potassium content in the precursor correlates with an increased surface area of the biochar, while lower self‑carbonization temperatures or higher melting points of the organic potassium salts promote a greater proportion of mesopores. Hydrogen bonding was identified as the primary adsorption mechanism, with density functional theory providing further insights into its significant role. This research presents a controllable, efficient, and environmentally friendly strategy for biochar activation and offers a predictive framework for optimizing biochar properties through organic potassium salt modification, laying a solid theoretical foundation for the design of advanced adsorbents with enhanced performance.
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
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 16
·15492-15506
·
IF 2.8
Li Junfei,Xie Yingying,Lu Guining,Ye Han,Yi Xiaoyun,Reinfelder John R.,Lin Zhang,Dang Zhi
Schwertmannite, a Fe(III)-oxyhydroxysulfate mineral formed in acidic (pH 3~4), iron- and sulfate-rich acid mine drainage (AMD) environments, tends to undergo phase transformations with changes in pH and redox condition, which may depend on the presence of various trace anions and cations. In the present study, the effects of Cu(II) on the stability of arsenate-, chromate-, and molybdate-substituted schwertmannite were investigated. The release of Fe(III) and sulfate from schwertmannite seems to be accelerated in the presence of Cu(II) at pH ~ 3, while Cu(II) retarded the dissolution of schwertmannite at pH ~ 5. XRD and SEM results showed that pure schwertmannite and chromate-substituted schwertmannite underwent transformation to goethite over a 2-month period, the presence of Cu(II) enhanced the stability of the mineral’s structure at both pH 3 and 5. However, the structures of arsenate- and molybdate-substituted schwertmannites showed no significant changes in the presence or absence of Cu(II) at both pH 3 and 5. During the phase transformation process, the amount of released oxyanions followed the sequence of chromate > molybdate > arsenate. Moreover, the release of arsenate and chromate from schwertmannite was retarded in the presence of Cu(II) at pH 5, whereas the release of molybdate was promoted. These results have important environmental implications for the stability of schwertmannite and its potential to immobilize contaminant trace elements under AMD conditions.
研究领域:
环境科学
·
矿物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2022
·Vol. 12
·期 10
·1412
·
IF 3.236
Jianrui Zha,Yaoqi Gu,Shuya Wei,Huarui Han,Ankun Wang,Qinglin Ma
Being inspired by nature, a series of experiments was carried out to deposit a calcium oxalate layer on the surface of the stone by the reaction between carbonate rock and oxalate salt. To increase the anti-dissolution properties of the calcium oxalate layer, the use of mixed oxalate solution has been proposed in the literature by two main routes: (1) adding acid agent to ammonium oxalate, which has the advantage of changing the particle structure and reducing layer porosity, and (2) using neutral methyl oxalate solution, which has the advantage of surface coverage due to slowly hydrolysis. In this study, we investigated the sequential application of ammonium oxalate, methyl oxalate, neutral mixed, and calcium acetate acid mixed solution. With this method, calcium carbonate and calcium oxalate solution can react inside the stone to reinforce it. The protective film’s coverage area can then be increased using dimethyl oxalate neutral mixed solution, and the crystal morphology can be modified with calcium oxalate acid mixed solution. The anti-dissolution properties of the coating were investigated using both a custom-designed apparatus and a selective outdoor environment. The coating displayed good acid resistance properties at pH 2–4. After one year of exposure, the coating is firmly bonded with the stone.Keywords:carbonate rock;sequential application;whewellite
研究领域:
地质学
·
文物保护
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Xiuying Liu,Qianna Xia,Jiao Zhou,Bowen Li,Shuaiqi Zhao,Long Chen,Aimal Khan,Xiaoxia Li,Aihua Xu
The design of efficient heterogeneous catalysts in bicarbonate-activated hydrogen peroxide systems (BAP) is a hot topic in wastewater treatment. In this work, Cu 2 O nanoparticles with different morphologies including cubic shape (c-Cu 2 O), octahedron shape (o-Cu 2 O) and spherical shape (s-Cu 2 O), were applied in BAP for the first time to degrade tetracycline hydrochloride (TC). Compared with Cu 2+ ions and CuO, TC degradation was boosted in the presence of Cu 2 O in the BAP system, with the degradation rate following the order c-Cu 2 O > o-Cu 2 O > s-Cu 2 O. The morphology-dependent effects could be linearly correlated with the ratio of surface oxygen species (O S ), but not with the surface area or Cu(I) ratio. The c-Cu 2 O catalyst with exposure of (100) facets contained 76.6% O S as the active site for H 2 O 2 adsorption and activation, while the value was much lower for o-Cu 2 O and s-Cu 2 O with dominant (111) facets. The presence of HCO 3 − enhanced the interactions among Cu 2 O, H 2 O 2 and TC, leading to facile oxidation of Cu(I) to Cu(II) by H 2 O 2 , and the formation of various reactive species such as hydroxyl radicals and Cu(III) contributed to TC degradation. This work provides a new method for enhancing H 2 O 2 activation with heterogeneous catalysts by crystal facet engineering.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）