CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Liqin Zhou,Kungang Chai,Xingdong Yao,Hongbing Ji
It is highly desirable to design and fabricate porous bio-based adsorbent for efficient and selective recovery of acetophenone (AP) and 1-phenylethanol (PE) from the effluent of propylene oxide and styrene monomer co-production (PO/SM) process. Herein, using cassava starch as the starting material, starch-graft-styrene hypercrosslinked polymers (SSHCPs) were designed and synthesized facilely by starch-graft-styrene copolymerization and subsequent crosslinking via a Friedel-Crafts alkylation route. SSHCP-3 (knitted by 4,4′-bis-(chloromethyl)-1,1′-biphenyl) shows high BET surface area (818 m 2 ·g −1 ), large pore volume, and high thermal stability, making it a highly efficient adsorbent for removal of aromatic pollutants from water. SSHCP-3 showed high uptake for AP (2.82 mmol·g −1 ) and selectivity (4.95) of AP over PE in binary-solute adsorption experiments. Spectral studies and theoretical calculation demonstrated that AP and PE uptake could occur at glucose units and benzene moiety via van der Waals interaction and π-π stacking interactions. SSHCP-3 also showed excellent adsorption efficiency of AP (93.6%) and PE (74.4%) in the wastewater discharged from PO/SM process. These results demonstrated that transforming styrene and starch to bio-based hypercrosslinked polymers provides an environmentally friendly and attractive strategy for recovery of AP and PE in practical application.
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
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Fangyi Pei,Zhimiao Wang,Jianhua Lv,Fang Li,Wei Xue
Cu–Zn–Al catalyst was prepared by the co-precipitation method, and the catalytic performance for transfer hydrogenation of acetophenone (AP) to 1-phenylethanol (1-PhE) was evaluated using isopropanol (IPA) as a hydrogen source. The addition of Zn changed the morphology of the catalyst and reduced aggregation of catalyst particles, resulting in highly dispersed Cu active sites. As the Zn content increased, the valence state of Cu species changed. When the Cu/Zn molar ratio was 2/3, the Cu+/Cu0 ratio in the catalyst was 0.81, resulting in good selectivity for 1-PhE. The reaction conditions were optimized over the Cu–Zn–Al catalyst with a Cu/Zn molar ratio of 2/3. When the reaction was performed at 180 °C for 2 h with an IPA/AP molar ratio of 15, the AP conversion was 89.4% and the 1-PhE selectivity was 93.2%. The Cu–Zn–Al catalyst showed good stability, and AP conversion and the 1-PhE selectivity were essentially unchanged after five cycles.
研究领域:
催化化学
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有机合成
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材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhiliang Duan,Zhaoqiang Zhang,Liqin Zhou,Youquan Zhang,Zhenxia Zhao,Fang Shen,Xingzhen Qin,Kungang Chai,Hongbing Ji
Efficient separation of acetophenone (AP) and 1-phenylethanol (1-PE) is crucial but challenging for high-value utilization of petrochemical by-products. To boost the AP/1-PE separation performance, a core–shell structure consisting of polyisocyanate layer grown on β-cyclodextrin (β-CD) particles (CD@PTDIT) was successfully fabricated by in-situ self-polymerization of toluene-2,4-diisocyanate trimer (TDIT) onto β-CD surface. The unique micro-architecture and chemical compositions of CD@PTDIT were comprehensively investigated by X-ray diffraction (XRD), solid-state 13 C CP/MAS NMR, X-ray photoelectron spectroscopy (XPS), elemental analysis, etc. Results indicated the well-maintained crystallinity of β-CD backbone and tunable thickness of polyisocyanate shell were integrated in CD@PTDIT. The unprecedented selectivity of CD@PTDIT for AP over 1-PE (6.9–9.4) combined with high AP uptake as well as the excellent recyclability was confirmed by both static adsorption and dynamic breakthrough experiments. Multicomponent breakthrough experiments using petrochemical by-product further demonstrated that CD@PTDIT maintained this selectivity in the practical applications. In-depth mechanism study using theoretical and structural investigations defined the essential host–guest interactions that produce the observed separation performance.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2019
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IF 3.074
Liqin Zhou,Qinghua Liang,Kungang Chai,Zhangfa Tong,Hongbing Ji
To separate acetophenone (AP) and 1-phenylethanol (PE), a kind of cost-effective β-cyclodextrin based polymeric sorbent (CE-CDP) was constructed by crosslinking β-cyclodextrin with toluene-2,4-diisocyanate trimer. According to the characteristic results, the structure of the CE-CDP consisting of β-cyclodextrin cavity, aromatic urethane bond and unique isocyanurate ring was proved substantially. It was shown that crosslinking process would enhance the thermal stability, and the incorporation of the unique crosslinking units into CE-CDP's network potentially improved the selective adsorption performance compared to analogous polymer with non-isocyanurate ring structure. The static adsorption performance of CE-CDP in single solute system was investigated. The adsorption capacity of AP was much higher than that of PE, indicating that CE-CDP exhibits much stronger affinity toward AP over PE. Based on the results, we found that the spontaneous adsorption processes of AP and PE onto CE-CDP could be well described by pseudo-second order kinetics , Langmuir and Freundlich isotherm models. And the preferential AP adsorption over PE (selectivity≈6) was further verified through binary competitive adsorption. In addition, the density functional theory calculations showed that the coexistence of β-cyclodextrin cavity, aromatic urethane bond and isocyanurate ring endows CE-CDP with high AP adsorption capacity and selectivity. The theoretical results also indicated that the noncovalent interactions involving the intermolecular hydrogen bonding , π-π interactions and electrostatic interaction are favorable for binding AP rather than PE. In conclusion, CE-CDP was proved to be a good adsorbent for selective separation of AP and PE with mass producibility, low cost, high reusability and wide application prospect.
研究领域:
材料科学
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化学工程
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分子生物学
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC COMMUNICATIONS
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2019
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IF 1.439
Bingbing Han,Zubiao Zheng,Dongcheng Zheng,Lei Zhang,Peng Cui,Jianjun Shi,Changjiang Li
The applications of a new supported tribromide reagent based on poly(vinylbenzyltrimethylammonium hydroxide) resin (Amberlite 717) were reported. This supported tribromide resin was used directly in α-bromination and α-bromoacetalization of acetophenones without any other catalyst under mild conditions. The effects of solvents and the amount of the supported tribromide resin on the reactions were investigated. Under the optimal conditions, most of α-bromo and α-bromoacetal of acetophenones were selectively obtained in excellent yields.
研究领域:
有机化学
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）