WASTE MANAGEMENT
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2025
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IF 7.1
Tianxiang Deng,Yi Chen,Delong Hou
The recycling of discarded THHN cables generates a substantial amount of mixed PVC/PA waste plastics, presenting a significant challenge to achieving sustainable development. In this study, we present a simple, catalyst-free, and scalable approach for upcycling all components of mixed PVC/PA waste. This method leverages HCl released from PVC during hydrothermal treatment to catalyse the cleavage of amide bonds in PA, converting mixed PVC/PA waste into valuable platform chemicals (over 80 % product yield) and carbon black within 30 min. Our work demonstrates a high-value recycling process for mixed PVC/PA waste in discarded THHN cables, reducing the generation of harmful Cl-containing waste, mitigating environmental pollution caused by mixed plastics, and offering valuable insights for the recycling of other PVC-containing mixed plastic wastes.
研究领域:
环境科学
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材料工程
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化学工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Yunbo Yu,Mengen Zhang,Congjing Ren,Ruijia Wang,Yao Yang,Tinghao Jia,Jingdai Wang,Yongrong Yang
Cycloalkanes are the main portion of petroleum hydrocarbons, yet their inert reactivity has put considerable technical challenges to efficient utilization. In this study, the liquid phase pre-oxidation process for efficient self-initiation cracking of cycloalkanes is proposed. In this process, a portion of decalin was converted into hydroperoxy-decalins. These hydroperoxy-decalins not only decompose more readily than decalin due to their weak O-O bonds but also continuously generate free radicals to accelerate the chain initiation reactions, thereby promoting the cracking of residue decalin. The experimental results indicate that the liquid phase pre-oxidation process can significantly improve both the conversion of decalin and the yield of high-value chemicals under 630–680 ℃, and the promotion efficiency increases with the oxidation depth. Compared to gas phase oxidative cracking, the liquid phase pre-oxidation cracking of decalin presents remarkably higher overall conversion and lower carbon oxides yield at elevated temperatures. Comprehensive kinetic models were established by the Reaction Mechanism Generator (RMG) and the reaction process was simulated using Chemkin-pro software packages to elucidate the underlying self-initiation mechanism of liquid phase pre-oxidation. This study introduces a novel promising approach for the efficient utilization of cycloalkanes in the production of high-value chemicals.
研究领域:
化学工程
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石油化工
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Wenting Li,Hao Yu,Dongran Qin,Qin Li,Xingzhen Song,Huaipeng Wang,Yuqing Ma,Yaxin Shang,Yifei Wang,Junshan Li,Yongfa Zhu
Wastewater purification and resource recovery present significant challenges for environmental sustainability. Herein, a self-designed plate reactor based on Pickering emulsion (PE) was reported for efficiently treating and recycling wastewater under sunlight irradiation. In this reactor, PE was formed using amphiphilic TiO 2 modified with organic pollutants, resulting in a photocatalytic degradation rate with 2.2 times higher than that of traditional powder system under sunlight, and the mineralization rate reached to 99.8 % within 24 h. This accelerated mineralization is attributed to the unique spatial separation of oleophilic intermediates through the oil–water interface of PE, which also enables the recovery of high-value chemicals. Notably, due to the dynamic re-modification of TiO 2 surface by degradation intermediates, the Pickering microcapsules remained stable during the degradation process, and deformed to varying degrees in the final stage of mineralization. It is suggested that the morphological changes of Pickering microcapsules can reflect the real-time mineralization rate and can serve as a visual indicator of the micro-degradation reactions. This work reveals the formation and stabilization mechanism of PE, facilitating the real application of Pickering plate reactor for efficient sunlight-driven photocatalytic wastewater purification and resource recovery.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
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2022
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IF 11.889
Hutao Wang,Caiye Hu,Yi Wang,Chunji Jin,Zonglian She,Liang Guo
Sulfadiazine (SDZ) as a common sulfonamide antibiotic is frequently detected in wastewater, but there is little information on the high-value product recovery and toxicity tolerance evaluation of mixotrophic microalgae under SDZ stress. In this study, effects of SDZ on growth, photosynthesis, cellular damage, antioxidant capacity and intracellular biochemical components of Chlorella pyrenoidosa were investigated. Results showed that the growth of C. pyrenoidosa was inhibited by about 20% under high SDZ stress, but there was little impact on photosynthesis. Cellular damage and antioxidant capacity were evaluated using malondialdehyde (MDA) content and superoxide dismutase (SOD) activity to further explain the toxicity tolerance of mixotrophic microalgae. The SDZ stress not only increased lipid and carbohydrate content, respectively attaining to the maximum of 390.0 and 65.4 mg/L, but also improved the biodiesel quality of C. pyrenoidosa . The findings show the potential of mixotrophic microalgae for biodiesel production and wastewater treatment.
研究领域:
环境科学
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生物技术
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微生物学
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产品关联
DOI
PubMed
高影响因子
Molbank
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2024
·Vol. 2024
·期 2
·M1828
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IF 0.6
Zhongwei Wang,Lin Song,Yukun Qin
This study aims to develop an efficient and green one-pot method for the synthesis of 6-en-1-yl furan-2-carboxylic acid heptyl ester. Initially, using furfural as the starting substrate, hept-6-en-1-yl furan-2-carboxylate was prepared using a one-pot method. This study developed a new experimental scheme for preparing ester compounds, using cuprous chloride as a catalyst and tert butyl hydrogen peroxide as an oxidant to prepare furoic acid. Without the need for intermediate treatment, the target product can be directly obtained from furfural by adding 7-bromo-1-heptene, TBAB, and potassium carbonate. This method effectively utilizes furfural as a platform chemical, demonstrating its potential for synthesizing high-value chemicals. The entire synthesis process is simple and efficient, following the principles of green chemistry.
研究领域:
有机化学
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绿色化学
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合成化学
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DOI
高影响因子
ACS Nano
·
2024
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IF 15.8
Qingyun Kang,Xiaofang Zhang,Qianyue Feng,Lin Zhang,Mingyu Chu,Chaoran Li,Panpan Xu,Muhan Cao,Le He,Qiao Zhang,Jinxing Chen
Hydro-depolymerization presents a promising avenue for transforming plastic waste into high-value hydrocarbons, offering significant potential for value-added recycling. However, a major challenge in this method arises from kinetic limitations due to insufficient hydrogen concentration near the active sites, requiring optimal catalytic performance only at higher hydrogen pressures. In this study, we address this hurdle by developing “hydrogen bubble catalysts” featuring Ru nanoparticles within mesoporous SBA-15 channels (Ru/SBA). The distinctive feature of Ru/SBA catalysts lies in their capacity for physical hydrogen storage and chemically reversible hydrogen spillover, ensuring a timely and ample hydrogen supply. Under identical reaction conditions, the catalytic activity of Ru/SBA surpassed that of Ru/SiO2 (no hydrogen storage capacity) by over 4-fold. This substantial enhancement in catalytic performance provides significant opportunities for near atmospheric pressure hydro-depolymerization of plastic waste.
研究领域:
材料科学
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环境科学
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化学工程
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催化
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Mengying Shan,Mingdong Yao,Nan Liang,Herong Wang,Nan Wu,Ying Wang,Wenhai Xiao,Ying-jin Yuan
Saffron contains pharmacologic active compounds and a large number of flavor compounds. Both originate from carotenoids by biocatalyzed oxidation. Crocetin in saffron exhibits various attractive bioactivities and could be considered in the treatment of various diseases including cancer, coronary heart disease, and hypertension. However, powerful strategies for the efficient and sustainable source of crocetin are lacking. To address this issue, we demonstrated a one-pot approach to bioconversion of crocetin from zeaxanthin via a dual-enzyme system consisting of carotenoid cleavage dioxygenase 2 (CsCCD2-M1 (R192F/S323A)) and aldehyde dehydrogenase (SynALD) with optimized protein expression and reaction system. Meanwhile, it was observed that the byproduct 3-hydroxy-β-apo-8′-carotenoic acid (3-HACA) severely accumulated due to the imbalance in the activity of the CsCCD2-M1 and SynALD. A suitable molar ratio of 6:1 and the optimized dual-enzyme reaction conditions were developed to eliminate 3-HACA completely. Consequently, the efficient biosynthesis of crocetin (1.48 mg/L/h) and an 80.8% conversion rate of crocetin within 2 h were accomplished after scaling up the optimized system by 10 000 times. Moreover, over 34% of enzyme activity was still retained in the residual enzyme system after three times of recycling. This study not only provides a sustainable means of crocetin production in vitro but also presents a new insight into the rapid construction of one-pot synthesis of high-value compounds with complex structures.
研究领域:
生物技术
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药学
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生物化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
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IF 9.224
Shuhao Wei,Yiyang Qiu,Xiucheng Sun,Xiaolong Wang,Haitao Li,Guojun Lan,Jian Liu,Ying Li
Conversion of waste plastics into high value carbon materials is of great importance for sustainable development. Herein, we propose a new approach to prepare sustainable nanoporous carbon catalysts (NPCs) with high catalytic performance for acetylene hydrochlorination by using waste poly(vinyl chloride) (PVC) as carbon source via a solid grinding method with the assistance of melamine. The addition of melamine not only makes the dechloridation of PVC occur easily at room temperature but also greatly improves the yield of carbon products. The nitrogen and defective sites of the NPCs can be easily adjusted by tuning the amount of melamine. Furthermore, NPCs as a carbon catalyst show superior catalytic performance in acetylene hydrochlorination, and the generated vinyl chloride (VCM) can be polymerized to produce PVC, which realizes the recycling of materials.
研究领域:
材料科学
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环境科学
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化学工程
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催化
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Yamiao Li,Jingxin Rao,Zhentao Jiang,Xinyi Zhang,Qiang Zhu,Caokai Zhu,Wenli Yu,Xin Dong,Shanshan Gao,Wenchi Zhang,Liang Lin,Mingyue Zheng,Rongzhen Zhang
Ergothioneine (ERG), a sulfur-containing natural antioxidant with significant biomedical potentials, has long been limited by low productivity in microbial fermentation. Here, we report the first high-efficiency in vitro reconstruction of a multi-enzyme cascade for ERG biosynthesis. To address the rate-limiting histidine methylation step, we employed a synergistic strategy integrating machine learning–based kinetic prediction (CataPro, DLkcat), molecular dynamics simulations, and conformational dynamics analysis to guide site-directed mutagenesis of Mycolicibacrterium smegmatis EgtD. This yielded a triple mutant M3 (L53A/T59S/E282S) with 3.4- and 2.8-fold enhancements in catalytic efficiency ( k cat / K m ) toward histidine and S-adenosyl-L-methionine (SAM), respectively. Mechanistically, M3 enhances catalysis by reducing the SAM-histine distance, optimizing the catalytic angle, eliminating non-productive hydrogen bonds, and unlocking a secondary ligand tunnel through a mutation-induced gating mechanism. When coupled with a SAM-regeneration module, the engineered cascade enables preparative-scale ERG synthesis, reaching a titer of 6.05 g·L −1 within 14.5 h and productivity of 10.01 g·L −1 d −1 —the highest report to date. This work showcases a structure-guided, AI-assisted approach that overcomes evolutionary constraints, unlocks latent reactivity, and accelerates the development of efficient biocatalytic cascades for high-value compound synthesis.
研究领域:
合成生物学
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酶工程
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计算生物学
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生物催化
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代谢工程
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结构生物学
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机器学习在生物技术中的应用
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2024
·
IF 5.8
Haihan Huang,Jie Zheng,Kaiyue Wu,Jian Lin,Xin Lin,Quan Yao,Qianyu Fan,Dechao Wang,Yuanbo Huang,Jianchun Jiang,Zhifeng Zheng
Catalytic pyrolysis technology is one of the most environmental and efficient approach in converting biomass waste into high-value chemicals and fuels. In this study, the ex-situ catalytic pyrolysis of cellulose to produce furans and olefins was reported using various metal-loaded TS-1 as catalysts. The experimental results showed that the Au/TS-1 exhibited an exceptional catalytic activity in the production of furans and olefins, achieving a selectivity of 49.17 % and 40.65 %, respectively. Ni/TS-1 effectively promoted the formation of ethylene, yielding a selectivity of 97.49 % and a yield of 6.11 C-mol%. Under the optimized conditions: pyrolysis temperature of 550 ℃, catalytic temperature of 600 ℃, and catalyst to cellulose mass ratio of 20:1, the Au/TS-1 catalyst achieved a furans selectivity of 41.91 % with a yield of 11.94 C-mol%, while olefins selectivity and yield were 49.84 % and 18.99 C-mol%, respectively. At this condition, Au/TS-1 still has excellent catalytic activity after 10 cycles and has good catalytic effect towards different biomass feedstocks. Furthermore, the possible mechanism to produce furans and olefins was revealed. This research offers valuable insights for guiding the directed conversion of biomass into value-added chemicals, paving the way for a more sustainable future.
研究领域:
化学工程
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催化
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生物质转化
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可再生能源
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产品关联
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Qianru Wu,Xuan Lv,Ningning Xu,Liantao Xin,Guangyi Lin,Kezheng Chen,Maoshuai He
Plastic waste has posed an ever-growing environmental threat to the United Nations’ sustainable development goals. Converting plastic polymers into high value chemicals like carbon nanotubes is a promising approach for recycling without carbon dioxide emission. Using a two-stage pyrolysis-catalytic reactor, we herein report the transformation of five types of plastic polymers into high-quality single-walled carbon nanotubes (SWNTs) with the assistance of a rationally designed heterogeneous catalyst , i.e., an iron metal catalyst supported by porous magnesia . Because of the high metal dispersion and the large carbon solubility of the active component, the heterogeneous catalyst affords the formation of uniform metal particles which can sustain high carbon fluxes, resulting in the synthesis of high quality SWNTs. More importantly, the approach is also demonstrated with mixtures of plastic polymers. This work helps gain deep insights into the mechanisms of plastic polymer conversion to SWNTs, accelerating the progress toward a sustainable plastic economy.
研究领域:
材料科学
·
环境科学
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化学工程
·
可持续性
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Xu Zhao,Rongcheng Du,Xuelian Chen,Xiangyue Wei,Yuwei Long,Xuehui Liu,Li Chen,Shimei Xu,Yu-Zhong Wang
High-efficiency and energy-saving conversion of epoxy thermosets into "three-high" (high value, high quality and high performance) products is highly desired from the viewpoints of both environmental protection and resource utilization. Here, we demonstrate a new strategy for mild degradation of epoxy thermosets and in situ preparation of polyurethane foam from degradation solutions. The degradation solution contains the unreacted solvent polyethylene glycol and polyol degradation products after alcoholysis, both of which can react with isocyanate to produce polyurethane. The use of an insoluble catalyst makes it possible to achieve in-situ foaming of the degradation solution, which realizes the direct and full utilization of degradation products. Owing to the rigid epoxy skeleton of the degradation products, the obtained rigid polyurethane foam exhibited high mechanical properties (∼170kPa), good thermal insulation performance (33–35 mW•m −1 •K −1 ), low water absorption (3–5%), regular pore structure and good thermal stability, thus can be a good candidate for building insulation materials.
研究领域:
材料科学
·
环境科学
·
化学工程
·
可持续发展
✓ 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）