Journal of Cleaner Production
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2018
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IF 5.651
Leiting Shen,Xiaobin Li,Qiusheng Zhou,Zhihong Peng,Guihua Liu,Tiangui Qi,Pekka Taskinen
To directly obtain solution of (NH 4 ) 2 WO 4 instead of Na 2 WO 4 is the key for developing a cleaner technology of ammonium paratungstate production. In this paper, ammoniacal ammonium carbonate solution was adopted for leaching tungsten from the converted product, a mixture of H 2 WO 4 and CaSO 4 obtained by treating scheelite with sulfuric acid . The research indicates that tungsten can be efficiently extracted in form of ammonium tungstate solution with WO 3 leaching yield of >99.5% under moderate leaching conditions. The WO 3 leaching yield is influenced by the transformation of calcium sulfate to calcium carbonate due to forming CaWO 4 through the secondary reaction between CaSO 4 and (NH 4 ) 2 WO 4 , whereas an excess (NH 4 ) 2 CO 3 (≥0.64 mol/L) can suppress the secondary reaction by facilitating the transformation. Additionally, the consumed ammonium carbonate can be recovered by treating the leaching residue with ammonium sulfate solution at above 70 °C. This work presents a cleaner and sustainable technique for producing ammonium paratungstate, with circulating the leaching reagents and bypassing the conversion of Na 2 WO 4 to (NH 4 ) 2 WO 4 .
研究领域:
化学工程
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材料科学
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环境科学
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高影响因子
Environmental Progress & Sustainable Energy
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2012
·Vol. 32
·期 3
·564-568
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IF 1.649
Wei-guo Pan,Rui-tang Guo,Xiao-bo Zhang,Jian-xing Ren,Qiang Jin,Hong-jian Xu
The absorption process of NO into KMnO 4 /(NH 4 ) 2 CO 3 solutions was studied in a stirred tank reactor. The experimental results showed that the reaction process was a fast pseudo-m reaction. The reaction between NO and aqueous solutions of KMnO 4 /(NH 4 ) 2 CO 3 was found to be first-order with respect to NO and with respect to KMnO 4 . The frequency factor and the average activation energy of this reaction were 2.3 × 10 9 m 3 /(mol s) and 36.77 kJ/mol, respectively. © 2012 American Institute of Chemical Engineers Environ Prog, 32: 564–568, 2013
研究领域:
环境科学
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化学工程
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高影响因子
HYDROMETALLURGY
·
2017
·
IF 2.605
Xiaobin Li,Leiting Shen,Qiusheng Zhou,Zhihong Peng,Guihua Liu,Tiangui Qi
Aiming to treat scheelite concentrate for producing ammonium paratungstate efficiently and cleanly, the conversion of scheelite to H 2 WO 4 and CaSO 4 ·nH 2 O in H 2 SO 4 solution was firstly studied in this work. The results show that H 2 SO 4 concentration, temperature, time, stirring speed, and particle size affect the conversion efficiency. Moreover, this work reveals that solid H 2 WO 4 layer on the surface of CaWO 4 particles forms and develops from thickness and looseness to thinness and denseness with increasing H 2 SO 4 concentration, and thus hinders the conversion of CaWO 4 to H 2 WO 4 , whereas CaSO 4 ·nH 2 O almost does not deposit in the layer. Meanwhile, H 2 WO 4 layer on CaWO 4 surface is resulted by isopolytungstate ions diffusion-tungstic acid deposition in diffusion layer. Additionally, the performance of separating H 2 WO 4 from CaSO 4 ·nH 2 O by leaching the converted product with aqueous ammonium carbonate solution was examined, showing that the converted product has an excellent leachability of tungsten in aqueous ammonium carbonate solution at ambient temperature with WO 3 leaching efficiency of about 99%. This work has the potential to develop a novel technique for tungsten extraction from scheelite concentrate under atmospheric pressure, bypassing the conversion of Na 2 WO 4 to (NH 4 ) 2 WO 4 .
研究领域:
冶金学
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化学工程
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高影响因子
MINERALS ENGINEERING
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2025
·
IF 5
Jia Li,Guoquan Zhang,Gaomiao Li,Yue Yan,Jun He,Ying Zhang
To address the persistent challenge of severe magnesium interference in lithium extraction from high Mg/Li ratio salt-lake brines, this study proposes an innovative two-stage process: magnesium mineralization followed by lithium extraction, enabling efficient separation and utilization of lithium and magnesium resources. Leveraging a homogeneous (NH 4 ) 2 CO 3 -Mg 2+ mineralization system, we elucidate the three-stage kinetic mechanism of mineralization and the crystallographic regulation of magnesium carbonate. At low temperatures (40 °C), rod-shaped MgCO 3 ·3H 2 O crystals are formed, achieving 88 % Mg 2+ mineralization efficiency with 5 % Li + loss. Elevated temperatures (>50 °C) trigger anisotropic crystal growth, transforming the product into porous spherical 4MgCO 3 ·Mg(OH) 2 ·4H 2 O, increasing Li + loss to 15 %. Higher CO 3 2− concentrations shorten nucleation induction periods but promote surface-attached flaky structures. Optimized drying temperatures suppress dehydration-induced phase transitions, yielding high-purity products. In the subsequent lithium extraction stage, a Tributyl phosphate(TBP)-FeCl 3 -kerosene system demonstrates enhanced efficiency via Al 3+ -induced salting-out effects. With 70 % TBP −30 % kerosene and 1.2 mol/L AlCl 3 , single-stage Li + extraction efficiency reaches 67 %, while Al 3+ co-extraction remains below 4 %. FTIR analysis confirms that Al 3+ optimizes TBP coordination by releasing free Cl − , effectively mitigating Mg 2+ competition. This work provides a novel approach for synergistic CO 2 utilization and lithium-magnesium resource recovery from salt lakes, enhancing the sustainable utilization of critical minerals.
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高影响因子
OPTICAL MATERIALS
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2018
·
IF 2.32
Qiang Liu,Cong Chen,Jiawei Dai,Zewang Hu,Haohong Chen,Jiang Li
Using the nanopowders synthesized by a reverse co-precipitation method, neodymium doped yttrium aluminum garnet (Nd:YAG) transparent ceramics were fabricated by vacuum sintering method. The influence of ammonium carbonate to metal ions (NH 4 HCO 3 /M 3+ ) molar ratio (R value) on the properties of Nd:YAG precursors and powders, as well as the densification, microstructure, and transmittance of the resultant ceramics was systematically investigated. The results show that the precursors have similar compositions and the calcined powders have pure Y 3 Al 5 O 12 (YAG) phase. However, the R value is closely related to the morphologies of the precursors and powders. It is found that the powder with R = 3.0 has strongest agglomeration and the powders with R = 3.2–4.0 show better dispersity. Using these powders as starting materials, the corresponding ceramics were sintered at 1720 °C for 20 h in vacuum. As a result, the ceramic with R = 3.2 obtains the best transmittance of about 72% at the wavelength of 1064 nm. The grain growth exponent and activation energy of the Nd:YAG ceramics fabricated from the powder with R = 3.2 were also studied.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2023
·
IF 8.7
Yan Wang,Xinlin Zhao,Negar Omidvar,Mengting Liu,Dongsheng Zou,Manyun Zhang
Fungicides and nitrogen (N) fertilizers are essential to maintain plant yield in current intensive agriculture. Percarbamide is a novel type of N fertilizer with strong oxidizing property, and the nitrification inhibitor is widely used in agricultural production. It may be feasible to apply percarbamide and nitrification inhibitor as N management to promote fungicide dissipations in soil-plant system. This study quantified the effects of percarbamide and nitrification inhibitor dicyandiamide (DCD) and 3, 4-dimethylpyrazole phosphate (DMPP) on carbendazim residues, and microbial communities of soil-plant systems, and relationships among carbendazim residues, soil and endophytic microbial communities and plant yields were also comprehensively quantified. Compared with the control, the percarbamide significantly reduced soil carbendazim residues by 29.4% but enhanced the lettuce yield by 28.0%. Soil carbendazim residues were significantly and negatively correlated with the soil total N and NO 3 − -N contents. Soil microbial community structures and co-occurrence networks were more sensitive to N management than their endophytic counterparts. In comparison to the percarbamide alone, the DCD significantly increased the nodes of soil fungal community co-occurrence network which were positively correlated with the plant yield. The DCD outweighed DMPP in increasing the lettuce yield and soil fungal community stability and reshaping soil bacterial community structure. Our study suggested that soil microbial communities were more sensitive to percarbamide and nitrification inhibitor applications than their endophytic counterparts under fungicide pressure and that the DCD outweighed DMPP in reshaping microbial communities. The integrated applications of percarbamide and nitrification inhibitors were promising soil N management strategies to promote fungicide removal and stimulate microbial community in the soil-plant systems.
研究领域:
农业科学
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土壤学
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微生物学
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环境科学
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植物科学
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DOI
PubMed
高影响因子
ChemCatChem
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2025
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IF 3.9
Wenhao Zhang,Liang Shen,Fayang Zhou,Xinyu Cao,Jiacheng Chen,Sheng Dai,Jing Xu,Minghui Zhu
Understanding the role of support is of guiding significance for studying the structure–activity relationship of supported Ni-based catalysts. In this work, catalysts with 0.1, 1, and 10 wt.% of NiO supported on CeO 2 , ZrO 2 , TiO 2 , and Al 2 O 3 were prepared by the impregnation method. The catalytic performance of CO 2 methanation was correlated with Ni particle size, reducibility, and basicity. The activity of the catalyst was found to be positively correlated with both the Ni particle size and reducibility, which promote the hydrogen dissociation and CO 2 activation processes, respectively. However, the basicity of the catalyst does not seem to be related to the reaction activity. Moreover, the coexistence of formate and the associative mechanism over the catalysts was evidenced. Graphical This work reveals that in CO 2 methanation over supported Ni catalysts, catalytic activity correlates positively with Ni particle size and reducibility, enhancing H 2 dissociation and CO 2 activation, respectively, but not with basicity. The coexistence of formate and associative mechanisms is confirmed over nickel-based catalysts in this work.
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JOURNAL OF CATALYSIS
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2025
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IF 6.5
Wenhao Zhang,Liang shen,Longhao Xu,Fayang Zhou,Fengyin Sun,Jing Xu,Minghui Zhu
Hydrogenation of CO 2 to methane is a feasible solution to the growing global environmental and energy challenges. Nickel-based catalysts are efficient and cost effective for CO 2 methanation. Hernin, we synthesized Mn-promoted Ni/Al 2 O 3 catalysts with facilitated CO 2 methanation and elucidated the crucial role of Mn. After Mn doping, NiMn/Al 2 O 3 catalysts showed improved NiO dispersion. Subsequently, H 2 reduction and CO 2 methanation treatments resulted in reduction of NiO and MnO 2 into Ni and MnO, and incorporation of Ni 2+ into MnO lattice, forming NiMnO x and creating numerous Ni-NiMnO x interfaces. The abundant oxygen vacancies from NiMnO x could enhance CO 2 activation. Moreover, oxygen vacancies at the interface also promote electron transfer from Ni and MnO, leading to electron-poor Ni nanoparticles and thus significantly promoting the *CO methanation. Ultimately, the electron-poor Ni nanoparticles and abundant oxygen vacancies at the Ni-NiMnO x interface jointly facilitate CO 2 methanation.
研究领域:
催化化学
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环境科学
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能源科学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Lin Gu,Wei Xia,Yifan Zhao,Shuhai Ding,Cong Kong,Junyu Zhang,Longlong Wang,Peng Wang,Guangxin Yang
Antibiotic pollution, particularly the overuse of tetracycline antibiotics (TCs), poses a significant threat to aquatic environments. Solid-phase extraction (SPE) is widely used for water sample pretreatment, and developing cost-effective, easily synthesized packing materials remains an active area of research. In this study, a novel filler material (SAS-MFP) was developed by combining commercial melamine-formaldehyde prepolymer (MFP) with a silica aerogel sponge (SAS), offering excellent water permeability, simple fabrication, and low cost. Characterization results revealed that the two materials were well integrated, with MFP evenly distributed across the surface of the silica aerogel. The adsorption mechanism of SAS-MFP was investigated through adsorption experiments. The results fit the Langmuir isotherm and pseudo-second-order kinetic models, indicating that SAS-MFP primarily adsorbs via chemisorption. Optimized SPE conditions led to the highest recovery (97.6 %) for four TCs under pH 7, using 400 mg of sorbent, a flow rate of 120 s·mL −1 , 5 % acetonitrile as the rinsing solvent, and 5 mL of 1 M oxalic acid–acetonitrile (1,4, v v −1 ) as the eluent. Furthermore, the limit of detection for TCs in blank water samples ranged from 0.09 to 0.12 μg·L −1 , with inter-day and intra-day relative standard deviations ranging from 2.46 % to 7.38 % and 4.58 % to 9.31 %, respectively, demonstrating the method's sensitivity and reproducibility for practical applications.
研究领域:
环境科学
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分析化学
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药物残留检测
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水污染控制
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材料科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Shi-Guan Yang,Feng-Shuo Guo,Qun-Xing Liu,Hao Wu,Ke-Ming Li,Yao Xiao,Shu-Qi Yin,Yao-Bing Huang,Qiang Lu
The glycolysis of polyethylene terephthalate (PET) has emerged as an efficient catalytic approach for recycling monomers from plastic waste, with reaction efficiency and product selectivity critically governed by catalyst design. Herein, we report a readily available and efficient manganese–cerium composite oxide (MnCeOx) for PET glycolysis to the monomers, i.e., bis(2-hydroxyethyl) terephthalate (BHET) and ethylene glycol. A series of MnCeOx catalysts with different Mn/Ce ratios and calcination temperatures were prepared, characterized, and evaluated in PET glycolysis, among which Mn0.33CeOx-550 exhibited optimal performance, achieving a 95.6% BHET yield at 200 °C within 150 min. The catalytic system demonstrated broad applicability in the conversion of various PET-based waste plastics, including PET bottles, PET woven tapes, and PET transparent films, to the target monomers with high yields. Mechanistic investigation revealed that the strong acid–base sites and the oxygen vacancies created through the incorporation of Mn into CeO2 greatly affected the catalyst’s reactivity. This work not only establishes a facile and efficient method for PET waste recycling but also advances the field toward greener industrial practices while expanding the catalyst library for sustainable plastic upcycling.
研究领域:
环境催化
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高分子化学
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材料科学
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绿色化学
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可持续发展
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废弃物资源化
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Hong He,Chaoshan Zhao,Junju Wang,Yi Xu,Yingzhou Huang,Muling Zeng,Shunbo Li
Material genomic engineering elucidates the regulatory mechanisms of multicomponent effects on material properties through high-throughput screening technologies, providing new insights for the directional design of materials. The cooperative effects of multiple additives in the crystallization of CaCO3 mimics the organisms to regulate crystallization to achieve complex crystal morphologies in nature. To solve the problem of rapid and large-scale additive screening problem in morphology control of biominerals, a High-Throughput Crystallization Screening (HTCS) microfluidic chip was developed. This HTCS chip makes use of the well-defined concentration gradient of multiple additives and permeability of PDMS thin films to induce crystallization by ammonium carbonate. Mg 2+ , citrate, and poly (sodium styrenesulfonate) were systematically selected to represent inorganic ions, small molecules, and macromolecules respectively, simulating biomineralization processes influenced by both ionic and macromolecular components. The results demonstrate that morphological evolution exhibits continuous, regular transitions with single additive concentration gradients. When subjected to combined additives, the crystal morphologies are observed to manifest as superpositions of individual additive. Finally, it is successfully applied to guide CaCO3 crystallization with desired morphology. The morphological consistency between HTCS chip and bulk systems is confirmed, validating the developed high-throughput platform as an effective tool for accelerated additive screening and synthesis protocol optimization in biomimetic crystallization processes.
研究领域:
材料科学
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生物矿化
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微流控技术
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结晶化学
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仿生材料
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高通量实验
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功能材料设计
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Huimin Wang,Ting Xie,Yunjiang Zhang,Yaxin Wang,Chenyu Huang,Lei Zheng,Chenyan Ma,Shaorui Sun
Although methanol steam reforming (MSR) is industrialized, Cu sintering and spontaneous combustion pose challenges for applications in automotive, marine, and military sectors. To address these, a small amount of Zr (Zn/Zr = 5:1) was introduced during ZnO synthesis, creating a heterostructure that increases surface area and pore volume, thereby enhancing Pd atom dispersion. The heterostructure improves active phase dispersion and strengthens interactions between Pd single atoms and the support, inducing electron transfer from Pd to the support. As a result, an electron-deficient Pd configuration promotes HCOO* intermediate formation, reducing carbon monoxide (CO) accumulation. The 0.1 % Pd/Zn 5 -Zr 1 catalyst (with a Pd content of 1000 ppm) exhibits a hydrogen (H 2 ) production rate of 1146.8 mol·g Pd −1 ·h −1 , achieving 93.3 % methanol conversion and 95.7 % carbon dioxide (CO 2 ) selectivity. Compared to the 3 % Pd/ZnO catalyst from prior work, Pd loading is reduced by 30 times, significantly improving utilization efficiency. Comprehensive characterization, performance evaluations, and theoretical calculations suggest that the heterostructure of ZnO-ZrO 2 facilitates excellent hydrogen productivity and selectivity, with atomic Pd playing a crucial role in methanol dissociation. Regulating the electronic environment of Pd and optimizing its interaction with the support are identified as key factors in designing high-performance catalysts.
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