SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Weiduo Zhao,Zhongwei Zhao,Yingpeng Xu,Ziming Cao,Tianyu Zhao
High-chromium vanadium slag, a typical hazardous solid waste, serves as a critical raw material for the comprehensive utilization of vanadium and chromium resources. To achieve synergistic recovery of vanadium and chromium, this study proposes an innovative process based on mineral phase reconstruction. A ternary eutectic multi-reaction system was established, and a novel Na 2 CO 3 -CaO co-roasting-leaching method was developed to enable selective separation of V and Cr. Combining DFT calculations, pure mineral roasting experiments, and actual vanadium slag roasting validation, the transformation mechanisms were elucidated: vanadium was converted into water-insoluble NaCaVO 4 and CaVO 3 , while chromium existed as water-soluble Na 2 CrO 4 during the Na 2 CO 3 -CaO co-roasting process. Under optimized conditions (roasting temperature 900 °C, duration 90 min, molar ratio n(CaO)/n(Na 2 CO 3 ) = 1), the average leaching efficiencies reached 84.23 % for Cr in the first-stage water leaching and 86.52 % for V in the second-stage ammonium bicarbonate leaching. The Cr concentration in the water leaching solution was 4.1 g/L (V: 0.7 g/L), whereas the V concentration in the ammonia leaching solution significantly increased to 7.1 g/L (Cr: 0.8 g/L). Impurity ions (Fe, Mn, Ti, Si) in both leaching solutions remained below 0.05 g/L. The remarkably low impurity levels substantially reduced purification costs, and the distinct concentration differences between V and Cr highlighted the selective separation advantages of the proposed process. These integrated characteristics provide critical feasibility support for industrial-scale implementation.
研究领域:
冶金工程
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环境科学
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Lucheng Li,Zehua Zhu,Jie Ni,Xiaojun Zuo
Phosphorus removal has been explored for a long time, however sustainable phosphorus adsorption and recovery with adsorbents recycling is rarely reported. This work proposes a sustainable phosphorus recycling route with calcium-modified powdered activated carbon with chitosan (Ca-PAC-CTS). The morphology, functional groups and crystal structure of Ca-PAC-CTS were characterized. The maximum phosphorus adsorption capacity was 16.73 mg/g Ca-PAC-CTS with Langmuir model at 298 K. Stable phosphorus sorption on Ca-PAC-CTS could be observed at the large range of pH (4– 10) when coexisting with NO 3 − , SO 4 2− , Cl − and F − , except HCO 3 − . 98.95 % The recovery of adsorbed phosphorus could get to 98.95 % using 0.05 M sulfuric acid solution, and the phosphate adsorption efficiency through Ca-PAC-CTS remained to be more than 80 % after five adsorption-desorption cycles, suggesting that Ca-PAC-CTS was one of the promising adsorbents for sustainable removal and recovery of phosphorus in aqueous solution.
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
PubMed
高影响因子
Chemical Engineering Journal Advances
·
2021
·
IF 0
Bing Li,Qiang Xue,Yong Wan,Lin Liu,Junhua Fu,Yitao Yu,Feng Wang,Jinhui Li,Fangzhi Zhang,Shuo Zhang,Zhenhua Wang,Ning Zhao
Water deterioration and eutrophication caused by phosphorus (P) contamination necessitates P removal from polluted water, and has been a research focus since the second half of last century. In this study, novel mesoporous micropheres based on silicon and calcium (Ca) was prepared as an adsorbent by direct pyrolysis to enrich and remove P. The maximum adsorption capacities of the prepared adsorbents were 356.34 and 496.73 mg g −1 P−PO 4 3− for potassium phosphate (K 3 PO 4 ) and potassium dihydrogen phosphate (KH 2 PO 4 ) solutions, respectively, and adsorption equilibrium was attained rapidly in less than 30 min. The Langmuir isotherm and pseudo-second-order kinetic model adequately fit the adsorption process for K 3 PO 4 solution, while the Langmuir isotherm and pseudo-first-order kinetic appropriately fit the KH 2 PO 4 solution. The adsorption of P was due to the reaction between Ca 2+ and PO 4 3− , forming different phosphates. Addition of interfering ions had no significant effect on the adsorption ability of the prepared adsorbents. The proposed adsorbent was successfully applied to remove P from real wastewater. Notably, this new Ca-modified mesoporous silicon micropheres is an excellent adsorbent for treating wastewater containing low P content, providing an effective approach for facile preparation of P adsorbents and exhibiting promising P removal from wastewater.
研究领域:
环境科学
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材料科学
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DOI
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Yue Xu,Zhao Wang,Zizhen Wu,Xuan Li,Xu Bi,Guangying Feng,Ningyi Li
Coal gangue (CG) was encapsulated into lanthanum alginate and calcium alginate to synthesize bimetallic modified coal gangue-alginate composite hydrogel beads (La-Ca/CG-SA), and their adsorption potential towards fluoride (F − ) from groundwater was investigated. Under optimal conditions (preparation parameters: CG dosage 6 %, La/Ca ratio 1:2, and crosslinking time 24 h; operational parameters: adsorbent dosage 0.3 g L −1 , pH 6.0, and F − concentration 3 mg L −1 ), the maximum adsorption capacity of F − was achieved (15.7 mg g −1 and 87.8 %). Kinetic results indicated that the adsorption process of F − by La-Ca/CG-SA followed the pseudo-second-order model (R 2 > 0.95). Coexisting ion experiments suggested that La-Ca/CG-SA exhibited high selectivity for F − . Additionally, La-Ca/CG-SA maintained superior F − removal performance (81.5 %) after five cycles. Electrostatic interaction, inner-sphere complexation, chemical precipitation, and ion exchange were demonstrated to drive the F − immobilization. This study provides novel insights into the resource utilization of CG and the development of high-performance hydrogel adsorbents, offering potential application value in treating fluoride-contaminated groundwater.
研究领域:
环境科学
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水处理技术
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材料化学
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污染控制工程
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资源化利用
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
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IF 3.909
Jiawen Chen,Shuning Chen,Wei Cheng,Jinhuo Lin,Shisheng Hou,Haiqing Liu,Qinhui Chen
Effective control of bleeding is critical to saving lives whether on the battle field or in civilian life. Microporous starch (MS) is a promising hemostat for its extensive sources, huge surface area and good biocompatibility. However, the hemostatic performance of MS is limited because of its complex preparation process and lack of effective component to activate coagulation factors . Herein, porous starch microspheres modified by calcium (Ca-PSM) with dense shell and honeycomb micro-porous core were prepared by electrostatic spray and supercritical CO 2 for the first time. The topological morphology of Ca-PSM changed with the increase of Tween-80 content within 0.5%. Ca-PSM possessed excellent water absorbability due to high specific surface area, and what's more, it showed good hemostatic performance because of the synergistic effects of physical adsorption and chemical activation mechanisms. The results of thrombelastograph (TEG) showed that the initial clotting time (R) and coagulation time (R + K) of Ca-PSM-1 were shortened by 47.1%, 53.3% than that of control group. The maximum blood clot strength (MA) of Ca-PSM-1 was also significantly raised. Furthermore, it was noteworthy that Ca-PSM could activate clotting cascade and induce erythrocyte adsorption. In summary, Ca-PSM as a hemostat will be a promising and alternative candidate for clinical application.
研究领域:
生物材料学
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医学工程
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药剂学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Di Pan,Yiping Guo,Kai Zhang,Huanan Duan,Yujie Chen,Hua Li,Hezhou Liu
In this work, (K 0.48 Na 0.52 )NbO 3 −0.05Ca x (Bi 0.5 Na 0.5 ) 1− x ZrO 3 lead-free piezoelectric ceramics were prepared by a conventional solid-state sintering method. The effects of Ca content on their phase structure, microstructures, and piezoelectric properties were systematically studied. With the increasing of Ca content, the rhombohedral-orthorhombic phase temperature gradually increases and Curie temperature of the ceramics without a conspicuous change. In addition, appropriate Ca ( x ≤ 0.2) content promotes the grain growth, which leads to a denser microstructure. Rhombohedral-orthorhombic and orthorhombic-tetragonal phase coexistence has been obtained in the composition range of 0.15 ≤ x ≤ 0.3. The ceramics with x = 0.2 possess enhanced piezoelectric properties of d 33 ∼308 pC/N and k p ∼49.0%, together with a high Curie temperature of T C ∼328 °C. Therefore, the material system of this work is a promising candidate for piezoelectric applications.
研究领域:
材料科学
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物理学
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
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2022
·
IF 11.889
Sheng-Nan Zhuo,Tian-Chi Dai,Hong-Yu Ren,Bing-Feng Liu
It is important to solve the problems of biomass treatment and combined contaminants removal in environmental remediation. In this study, a calcium (Ca) modified biochar (CaBC800) was fabricated using corn stover (CS) as a raw material to remove phosphate and tetracycline (TC). The experimental results indicate that CaBC800 can adsorb both inorganic phosphate and organic TC. The entire adsorption process corresponds to pseudo-second-order kinetics and Langmuir adsorption isotherm. The maximum adsorption capacities of phosphate and TC were 33.944 and 33.534 mg/g, respectively. The phosphate adsorption was demonstrated to mainly depend on the chemical precipitation by Ca 2+ and ligand exchange by hydroxyl groups from CaBC800. Meanwhile, hydrogen bonding from oxygen functional groups and π-π interactions from aromatic rings are the main adsorption mechanisms of TC. This study provides a new adsorbent to efficiently remove phosphate and TC, and the simultaneous adsorption indicates the application potential of CaBC800 in wastewater remediation.
研究领域:
环境科学
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污染治理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wei Wang,Wenhua Cheng,Zhenjie Liu,Murong Xi,Zhouliang Tan,Yadong Wang,Weilu Zhang,Pingping Chang,Zihan Qi,Huan Zhou,Han Zhang,Juan Ding,Yudai Huang
The commercialization of Ni-rich layered oxide cathode materials has been severely hampered by rapid capacity degradation and safety issues. Here, we demonstrate a lattice reconstruction strategy to improve the structural and thermal stability of LiNi 0.83 Co 0.11 Mn 0.06 O 2 (NCM83) via calcium. The enhanced stability of NCM83 is ascribed to the formation of Ca-O bond, which is stronger than TM-O (TM=Ni, Mn, Co) bond. The lattice reconstruction enables metal-O (M-O) bond more stable which mitigates the loss of lattice oxygen, thus improving the reversibility of the H2-H3 phase transition in NCM83. Moreover, Ca 2+ acts as a pillar, facilitating the transport of Li + . The lattice-reconstructed Ni-rich cathode material with 0.5 % Ca can maintain a capacity retention ratio of 97.3 % at 1 C after 150 cycles. As compared with the pristine NCM83 cathode, the high-voltage cycling stability at 4.5 V and high-temperature performance at 55 °C are increased by 17.9 % and 12.2 %, respectively. This work actually proposes a new approach to design and construct high-performance Ni-rich cathode materials for practical lithium-ion batteries.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
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IF 6.2
Xiaohua Li,Zhufeng Liu,Shanshan Shao,Yongbo Yu,Weicheng Wang,Tianrui Sun,Shiliang Wu
Steam reforming of bio-oil is a promising technology for the industrial-scale conversion of biomass into hydrogen energy, in which the catalyst plays the crucial role. This study proposes a Ni-Ca-Al-Ce-O catalyst, prepared by CaO loading onto Ni/CeO 2 ·Al 2 O 3 , and tested in the two-stage adsorption-enhanced reforming of biomass pyrolysis oil for hydrogen production. The effects of carrier type and Ni loading on the physicochemical properties of the Ca modified Ni-based reforming catalyst and its reforming performance were investigated, and its reusability was tested finally. The results revealed that more Ni metal active sites are available on CeO 2 ·Al 2 O 3 compared to biochar as carrier. However, side reactions such as ketonization were significantly promoted due to the metal oxides in red mud (RM), resulting in a large amount of methane as a by-product over the Ni/RM catalyst. When Ca additive introduced on the well selected Ni/CeO 2 ·Al 2 O 3 , the selectivity of hydrogen in the reforming gas was enhanced. Meanwhile, more spinel NiAl 2 O 4 was formed due to the interaction between NiO and Al 2 O 3 , which enhanced the stability and activity of the Ni-Ca-Al-Ce-O catalyst. With a Ca/Al ratio of 1:1, Ni was more uniformly dispersed, and the yield and selectivity of hydrogen reached 73.35 % and 76.90 %. In the reusability tests, the yield of hydrogen remained above 60 % after six runs, which was superior to that of similar reforming catalysts, suggesting that the proposed Ni-Ca-Al-Ce-O catalyst is reliable in terms of reusability.
研究领域:
能源化学
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催化材料
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2023
·Vol. 15
·期 17
·3087
·
IF 3.4
Cancan Xu,Rui Liu,Qi Tang,Yifan Hou,Lvjun Chen,Quanxi Wang
In recent years, in order to improve the rural living environment, rural domestic sewage treatment has received more and more attention in China. However, the standard compliance rate of total phosphorus (TP) in rural domestic sewage after treatment is very low, and TP has become the main pollutant that prevents rural domestic sewage treatment facilities from meeting water pollutants discharge standards. In this study, to prepare calcium-modified biochar composites (E-BC) by one-step pyrolysis, waste eggshell (E) was employed as a calcium source and waste pine sawdust (BC) was employed as a carbon source. The E-BC composites produced were effective in adsorbing phosphate (P) from aqueous solutions in a broad pH range of 3–11, with good adsorption selectivity. E-BC’s adsorption capacity for P increased as the pyrolysis temperature increased from 700 °C to 900 °C, which was attributed to the higher specific surface area and calcium oxide content at higher pyrolysis temperatures. The E-BC sample, which was made from eggshell (filtered through 100 mesh sieves) and pine sawdust (filtered through 100 mesh sieves) with a mass ratio of 2:1 and a pyrolysis temperature of 900 °C, had a maximum adsorption capacity of 301 mg/g. The Langmuir model and pseudo second-order model were the best at describing the adsorption process, and the predominant sorption mechanism for P is the chemisorption reaction of calcium oxide or calcium hydroxide with phosphate to create hydroxyapatite. E-BC can effectively remove P from rural domestic sewage. The total phosphorus (TP) removal rate in rural domestic sewage ranges from 95.3 to 99.5%. After adsorption treatment, the discharge of TP in rural sewage meets the second-grade (TP < 3 mg/L) or even the first-grade (TP < 2 mg/L). This study provides an experimental basis for efficient P removal using E-BC adsorbent materials and suggests possible applications in rural domestic sewage.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Can Yang,Yan Wang,Jinquan Wan,Bin Zhu
The effective removal of phosphate from wastewater and prevention of eutrophication of water bodies are of great significance. This study develops and compares the phosphorus removal performance of natural siderite with three different modification methods: thermal activation, hydrothermal treatment, and surface precipitation. The calcium-modified siderite composite (SID-Ca) exhibited excellent phosphorus removal performance for low to medium concentration phosphate wastewater (PO 4 3- -P < 15 mg/L), with a maximum adsorption capacity of 33.4 mg/g, which was 7.4 and 5.3 times higher than that of natural siderite (SID) (4.51 mg/g) and hydrothermally treated siderite (SID-H) (6.28 mg/g), respectively. SID-Ca did not show significant differences in adsorption performance at high levels of co-existing ions (SO 4 2- , NO 3 - ) at 500 mg / L. Following characterisation by XRD, XPS, FTIR and MAPPING, it was concluded that the phosphorus removal mechanism of the SID-Ca composites was primarily the inner complexation in ion exchange and ligand exchange. By leveraging the exceptional stability and low cost of natural siderite to develop a modified siderite using straightforward co-precipitation, a novel approach for phosphate adsorption in wastewater was established, and its removal mechanism was elucidated.
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
FUEL
·
2020
·
IF 5.578
Tongxin Qu,Shengli Niu,Xiangyu Zhang,Kuihua Han,Chunmei Lu
The calcium modified Zn-Ce/Al 2 O 3 heterogeneous base catalysts are synthesized by the hydrothermal method, impregnation method and co-precipitation method, respectively. Further, they are applied to catalyze transesterification of palm oil with methanol for the biodiesel production. The hydrothermal method with the Ca: Zn: Ce: Al molar ratio of 5: 4: 1: 1 is preferred to synthesize the catalyst due to the best catalytic performance. The catalyst shows strong reusability, where the biodiesel yield of 87.37% is obtained for the fifth reused cycle and the weakened catalytic capability is mainly ascribed to the leaching out of the active sites. The response surface methodology with the central composite design (RSM-CCD) is employed to optimize the transesterification parameters and predict the biodiesel yield. The predicted maximum biodiesel yield of 99.44% is achieved at the reaction temperature of 66.12 °C, methanol to oil molar ratio of 18.53 and catalyst amount of 8.19 wt. % with 3 h, which is consistent with the experimental result of 99.41%. Also, the physical properties of the produced biodiesel meet the ASTM D 6751 standard. This study reveals the Ca-Ce-Zn/Al 2 O 3 catalyst gains a good application prospect in the biodiesel production and the response surface methodology is effective in optimizing the transesterification parameters and predicting the optimal values.
研究领域:
化学工程
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可再生能源
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催化材料
✓ 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）