ACS Omega
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2023
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IF 4.1
Pengwei Li,Ting Zhao,Ziheng Zhao,Hanxiao Tang,Weisheng Feng,Zhijuan Zhang
In this study, one well-known CHM residue (Atropa belladonna L., ABL) was used to prepare biochar capable of adsorbing rhodamine B (RhB) with an ultrahigh surface area for the first time. Three micropore-rich ABL biochars including ABL@ZnCl2 (1866 m2/g), ABL@H3PO4 (1488 m2/g), and ABL@KOH (590 m2/g) were obtained using the one-step carbonization method with activation agents (ZnCl2, H3PO4, and KOH) via chemical activation and carbonization at 500 °C, and their adsorption performance for RhB was systematically studied with adsorption kinetics, isotherms, and thermodynamics. Through pore diffusion, π–π interaction, and hydrogen bonding, ABL biochar had excellent adsorption performance for RhB. Moreover, when C0 was 200 mg/L, biochar dosage was 1 g/L, and the contact time was 120 min; the maximum RhB adsorption capacity and removal efficiency on ABL@ZnCl2 and ABL@H3PO4 were 190.63 mg/g, 95% and 184.70 mg/g, 92%, respectively, indicating that it was feasible to prepare biochar from the ABL residue for RhB adsorption. The theoretical maximum adsorption capacities of ABL@ZnCl2 and ABL@H3PO4 for RhB were 263.19 mg/g and 309.11 mg/g at 25 °C, respectively. Furthermore, the prepared biochar showed good economic applicability, with pay back of USD 972/t (ABL@ZnCl2) and USD 987/t (ABL@H3PO4), respectively. More importantly, even after five cycles, ABL@H3PO4 biochar still showed great RhB removal efficiency, suggesting that it had a good application prospect and provided a new method for the resource utilization of traditional CHM residues. Additionally, pore diffusion, π–π interactions, and hydrogen bonding all play roles in the physical adsorption of RhB on ABL biochar. π–π interactions dominated in the early stage of RhB adsorption on ABL@H3PO4, while pore diffusion played a crucial role in the whole adsorption process on both adsorbents.
研究领域:
环境科学
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材料科学
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中医药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
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IF 4.7
Shidong Wang,Yaxi Wang,Xinru Wu,Cejun Hu,Hongwei Zhang,Qinyang Cui,Xiaojun Bao,Pei Yuan
Pore diffusion effect plays a crucial role in heterogeneous hydrogenation of unsaturated polymers. However, how large pore size can eliminate the pore diffusion limitation remains a controversial issue. Herein, we prepared a series of Pd/SiO 2 catalysts with graded pore sizes and investigated the effect of pore size on hydrogenation activity of nitrile butadiene rubber (NBR). It is found that when the catalyst pore size (D cat ) is 7 times of the diameter of NBR chains (D NBR ), the Weisz modulus Φ can be reduced to < 0.3 thus the internal mass transfer limitation can be eliminated, making NBR easier to approach the active sites. Consequently, the catalysts with the D cat /D NBR > 7 exhibit excellent catalytic activity (96.7%) and selectivity (100%) to C = C. This work emphasizes that the pore size of catalysts can regulate the pore transfer limitation and the accessibility of internal active sites, providing useful guidance for the design of efficient macromolecular hydrogenation catalysts.
研究领域:
催化
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材料科学
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聚合物化学
✓ 已验证
产品关联
DOI
高影响因子
Chemical Engineering and Processing-Process Intensification
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2019
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IF 3.031
Yongkun Zheng,Qinglian Wang,Chen Yang,Ting Qiu
Catalyst performance is highly relevant to its mass transport performance. In the present study, seven styrene-co-divinylbenzene polymer samples were synthesized by varying the amounts of crosslinker and porogen, so as to elucidate mass transport mechanism in poly (styrene-co-divinylbenzene) microspheres with hierarchical pore structure. Correspondingly, pore structure parameters of seven samples were characterized by BET and MIP. By choosing toluene as probe molecule, surface diffusion coefficient and pore diffusion coefficient of toluene inside the microspheres were measured. The experimental results indicated that both surface diffusion coefficient and pore diffusion coefficient increase with the rise of the ratio of average mesopore diameter to average macropore diameter under a certain porosity. Moreover, the rise of porosity results in greater enhancement of pore diffusion coefficient than surface diffusion coefficient. Finally, sulfonic acid groups were anchored onto polymer microspheres to investigate the relative importance of mass transport performance and catalytic performance by virtue of methyl acetate hydrolysis.
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
危险品化学品经营许可证（带存储）