Desalination and Water Treatment
·
2024
·
IF 1
Jian-jun Lian,Meng Wu,Hong-yan Wu,Yan-ting Liu,Qing Xu,Man-jun Miao,Jian-hua Yang,Ke-ke Mao,Bo Chen,Feng Xue,Qiao-ping Kong,Ming-hao Shang,Xiu-ling Li
The significant increase in demand for molybdenum (Mo) resources has led to excessive molybdate (Mo(VI)) content in water, posing a challenge to the innovation of Mo(VI) removal technology in water bodies. Nanoscale iron sulfide (FeS) has an important effect on the environmental behavior of Mo(VI) in aquatic solutions. To address the issue of easy agglomeration and poor stability of FeS, zirconia sol-modified nanoscale iron sulfide (Zr-FeS) was synthesized, and the adsorption behavior of Zr-FeS on Mo(VI) from diverse aquatic solutions was also investigated in this study. The results showed that the removal rate of Mo(VI) was increased from 28.60% to 78.32% within pH value of 7.0 when Zr/Fe molar ratio was elevated from 0 to 0.5. Moreover, the Mo(VI) adsorption efficiency by Zr-FeS was closely related to pH values, and acid conditions were beneficial for Mo(VI) adsorption. The pseudo-second-order model demonstrated a better fit to the data compared to other models. The maximum adsorption capacity of Zr-FeS towards Mo(VI) value calculated by Langmuir isotherm model was 118.48 mg/g at 298 K. The thermodynamic analysis revealed that the adsorption process of Mo(VI) was endothermic, entropically favorable, and spontaneous in nature. Competing anions (e.g., PO 4 3– , HCO 3 – , and SO 4 2– ) partially inhibited the adsorption process of Mo(VI) by Zr-FeS. While the process was less affected by dissolved oxygen and aging. The results of Fourier-transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and density functional theory (DFT) calculations revealed that the main mechanisms for Mo(VI) removal were hydrogen bonding, electrostatic interaction and surface complexation. The high stability and fast adsorption rate indicated that Zr-FeS was a promising material to remove Mo(VI) from the aquatic solutions.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2023
·Vol. 25
·期 19
·2300256
·
IF 3.6
Qian Ma,Anze Shui,Qingliang Shan,Changrong Chen,Chao He
ZrO 2 -modified aluminum titanate (Al 2 TiO 5 , AT) flexible ceramics are prepared by solid-state reaction method. The influence of sintering temperature and holding time on the microstructure and mechanical properties is investigated. Temperature-dependence behavior of the flexibility is observed. It is believed that temperature-dependence behavior of AT grain aspect ratio should take responsibility. However, average value of the aspect ratio remains unchanged regardless of holding time. Reasons are as follows: the formed zirconium titanate (ZrTiO 4 , ZT) grains could pin in AT grain boundaries, and internal stress generates between AT/ZT boundaries during grain growth process, thus inhibiting AT grain growth and reducing its growth rate, leading to AT grain refinement and increase of its aspect ratio. But, the increase of holding time reduces the inhibition effect and the increase of temperature strengthens the effect, resulting in rapid AT grain growth, especially its width. As a result, though the length and width of AT grains increase with the increase of holding time, its aspect ratio remains unchanged. On these bases, AT grain growth model related to holding time is proposed. It is expectable that the discovery of this study can deepen the research of particle pinning and provide a reference for abnormal grain growth.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Menglu Cai,Xiaozhong Wang,Yiming Mo,Yingqi Chen,Liyan Dai
The selectivity limitations of tert-butylation of naphthalene for obtaining 2,6-di-tert-butylnaphathalene (DTBN) was overcame (2,6-/2,7-DTBN>30) over fine-tuned mordenite . With citric acid (CA) and zirconium modification, the synergistic effect of the alkylation catalyst was promoted and the ratio of 2.6-/2,7-DTBN increased after controlling the reaction conditions. Only requires 5.0 equivalents of solvent, 3.0 equivalents of tert-butanol and 20 wt% of catalyst dosage, the ratio of 2,6-DTBN/2,7-DTBN can reach to 49, overcoming the selectivity barriers in naphthalene alkylation reaction. Present study reveals that high 2,6-selectivity can be realized with the optimized acidity, enhanced synergistic effect and fine-tuned zeolite structures.
研究领域:
化学催化
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材料科学
·
有机合成
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Huidan Guan,Miao Lei,Dongxue Liu,Junpeng Guo,Ling Yan,Tian Chen,Ye Li
A novel La-Zr@SA/NIPAM adsorbent was synthesized through bimetallic modification of sodium alginate (SA) and acrylamide (NIPAM)-based hydrogel for efficient phosphate removal. Compared to conventional adsorbents, La-Zr@SA/NIPAM exhibits abundant active sites and remarkable selectivity for phosphorus, with a maximum adsorption capacity of 105.3 mg/g for phosphate. The material properties were thoroughly characterized using scanning electron microscopy-energy dispersive X-ray analysis (SEM-EDS), N 2 adsorption/desorption isotherms, Fourier transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS) techniques. N 2 adsorption/desorption isotherms analysis showed that the specific surface area was 125 m 2 /g and consisted mainly of mesopores, and the network structure was clearly observed in the SEM images to provide a good support structure for the adsorbent. Meanwhile, the study investigated the impacts of pH, temperature, concentration, coexisting competitive ions, recycling regeneration, and actual wastewater on phosphate adsorption. The adsorption process is exothermic and spontaneous, favored by higher temperatures. Kinetic and thermodynamic studies support pseudo-secondary kinetics and Langmuir modeling indicating monolayer chemisorption. Cycle regeneration and real wastewater experiments demonstrated that La-Zr@SA/NIPAM maintained 80 % phosphate removal even after six regenerations. The phosphate removal mechanism involves electrostatic attraction, ligand exchange, and complexation. Moreover, the treatment of real wastewater is similar to the experimental results and also has a significant effect on the removal of other ions, which highlights the great potential of this method in mitigating phosphorus pollution.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiaoxia Zhang,Zhipeng Zhou,Junjie Liao,Liping Chang,Jiancheng Wang,Weiren Bao
The ultra-deep removal of thiophene from coke oven gas (COG) is critical for the conversion of COG to methane. Currently, Cu/ZnO/Al 2 O 3 is considered as a promising sorbent for thiophene removal; however, its desulfurization performance is currently unable to meet the requirements for industrial applications. Here, a zirconium modification strategy is proposed to overcome this problem, allowing zirconium loaded copper-based sorbents (Cu/ZnO/Al 2 O 3 /ZrO 2 ) with significantly improved thiophene removal performance and high activity to be obtained. Characterization results showed that zirconium improved both the dispersion of copper and the concentration of Lewis acid sites on the sorbent surface. A ZrO 2 concentration of 2 % resulted in stronger Cu-Zn interaction, and the dispersion of Cu on the surface of the sorbent reached its maximum value (49.20 %). Additionally, the Lewis acid strength was also maximized, which greatly improved the desulfurization activity and resulted in a breakthrough adsorption capacity of thiophene (Q b-thiophene ) of 36.24 mg/g, which was about 17 % higher than that of the unmodified Cu/ZnO/Al 2 O 3 sorbent. These results demonstrate that the sulfur capacity of the sorbent can be increased by increasing the number of acidic sites on its surface, paving the way for ultra-deep thiophene removal in industrial applications.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Licong Jiang,Liyuan Ren,Yongsheng Zhang,Weiliang Zhou,Xinlong Wang,Leqin Xiao
In this work, novel organic–inorganic hybrid microspheres (MZr-PF) of the zirconium modified phenolic resin with montmorillonite (MMT) were synthesized and used to prepare polyurethane (PU) composites. The hybrid microspheres could significantly improve the flame retardancy and thermal insulation of PU composites, with a 62.1 % reduction in the release of toxic gases CO. Compared with pure PU, the LOI, PHRR, THR and TSP of the flame retarded PU containing 25 wt% MZr-PF (PU/25MZr-PF) were decreased by 34 %, 61.8 %, 49 % and 34.4 %, respectively. When PU/25MZr-PF was coated on steel sheet, the backside temperature of PU/25MZr-PF/steel was reduced by 36.5 % during combustion. The combined action of catalytic carbonation by Zr 4+ or MMT and enhancement by MMT promoted the formation of highly graphitized char layer with C-O-Si, C-O-Zr and Si-O-Zr crosslinking structure. Furthermore, Zr 4+ or –OH on MZr-PF could form coordination or hydrogen bonds with N–H in PU structure, which facilitated the interfacial interaction between MZr-PF and PU. The tensile strength and elongation at break of PU/ 25MZr-PF were increased by 225 % and 94.1 %.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Xiangjun Li,Jiancheng Cao,Muhammad Asif Nawaz,Dianhua Liu
Polyoxymethylene dimethyl ether (PODE n ) is a clean, effective and promising diesel additive. In this work, acidic sulfonated resin modified by zirconium (Zr 4+ -SR), which possess both Lewis and Brønsted acid sites, was employed to catalyze the synthesis of PODE n from methanol (MeOH) and formaldehyde (FA) solution. The catalysts were investigated by various characterization methods including SEM, BET, XPS, FT-IR, NH 3 -TPD, Pyridine FT-IR, TG-MS and ICP-OES. It was found that the introduction of Zr 4+ into cationic exchange resin formed the Lewis acid sites and improvement of the catalytic performance in PODE n synthesis from methanol and formaldehyde solution was attributed to the synergistic effect of Lewis and Brønsted acid sites. With the increase of zirconium loading, the amount of Lewis acid sites and weak acidity of the Zr 4+ -SR catalyst increased gradually, and the catalytic activity of the catalysts for the PODE n synthesis reaction exhibited a trend of increasing first and then decreasing. In the methanol and formaldehyde solution, Brønsted acid sites were active for the acetalization of hemiformal and methanol, while Lewis acid sites were conducive to the activation of the methylene glycol. A possible reaction route for the PODE n synthesis from methanol and formaldehyde solution was proposed. 61.1% methanol conversion, 98.7% PODE 1–6 and 22.4% PODE 3–6 selectivity were achieved under optimal reaction conditions. The reusability investigation of the Zr 4+ -SR catalyst showed a stable catalytic activity for the synthesis of PODE n from methanol and formaldehyde solution and revealed that the decrease of catalyst activity was attributed to the partial loss of the zirconium.
研究领域:
催化化学
·
能源化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Qing Zhang,Didi Li,Zhaocong Jiang,Haoyuan Gu,Mengyuan Zhu,Shiqing Jin,Minghui Zhu
Acknowledged as an ideal method for in situ hydrogen generation, methanol steam reforming (MSR) requires high-performance catalysts to enhance production efficiency. Herein, we prepared a series of Zr-modified Cu-based catalysts by a coprecipitation method and conducted a systematic analysis of the impacts of structural variations on MSR performance. Extensive characterization reveals a strong dependence of the catalyst’s surface structure on Zr content. Introducing a moderate amount of Zr to the Cu/ZnO catalysts forms ZnZrO x solid solution and increases Cu dispersion, forming more Cu-ZnZrO x and Cu-ZnO interfacial sites with higher H 2 production rate. Further increases in Zr content enlarge Cu nanoparticles and multiply Cu-ZrO 2 interfacial sites. The optimal catalyst with a Zn/Zr molar ratio of 5, with the richest Cu-ZnO/Cu-ZnZrO x interfacial sites, achieves the highest H 2 production rate of 117.4 mmol H 2 g cat -1 h -1 at 200 °C, which is 1.3 times and 6.8 times higher than those of Cu/ZnO and Cu/ZrO 2 , respectively.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Tao Luo,Jinsheng Ye,Wenyan Huang,Ke Li,Yufan Wu,Yeqi Zhu,Siqi Lan,Shengjian Mao,Zhichao Xue,Rongqian Yao
Aimed at making SiC-based composites for thermal protection components to catch up with the increasing Mach number of hypersonic vehicles, a facile strategy is proposed to fabricate lightweight SiC(Zr, rGO) nanocomposite polymer-derived ceramics (PDCs). The key technique is repyrolyzing SiC(Zr, rGO) p /polyzirconocarbosilane–vinyltriethoxysilane–graphene oxide (PZCS–VTES–GO, PZVG) blends. Highly cross-linked PZVG can effectively optimize formability of precursors, and in-situ formed Zr-containing phases are beneficial in preventing further grain growth of β-SiC and improving bonding strength within ceramic network. More interestingly, ZrOSi transition zone tightly coupled with nanocrystals helps to increase structure disorder of amorphous ceramic matrix to tough nanocomposite structure. Particularly, SiC(Zr, rGO) 1300 nanocomposite PDCs own outstanding hardness (8.10 GPa), superior fracture toughness (3.84 MPa·m 1/2 ), high ceramic yield (92.60%), and low linear shrinkage (5.00%). Zr-modification enables them to retain favorable overall performances even after 60 min of oxidation under a 1300°C butane torch flame. Timely self-healing ZrO 2 (ZrSiO 4 )/SiO 2 protective layer can enhance high-temperature oxidation resistance. Meanwhile, ZrO 2 and ZrC have a unique combination of good high-temperature stability/resistance to corrosion, strongly improving structural integrality. As demonstrated, such in-situ construction of nanocomposite system and pyrolytic mechanism open new opportunities for obtaining PDCs with superior high-temperature ablation resistance, toward emerging uses in thermal protection system of hypersonic aerospace vehicles.
研究领域:
材料科学
·
航空航天工程
·
纳米技术
·
陶瓷材料
·
聚合物科学
✓ 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）