Prof. DONG Jian | Publications & Academic Profile | SinoGreenTech

Research Publications & English Decoded Briefs

Showing 2 publications

Journal of Environmental Engineering Technology•2026•DOI: 10.13205/j.hjgc.202608008

Circular-Economy-Oriented Medium-Chain Fatty Acid Production from Organic Wastes via Chain Elongation: Artificial Regulation and Resource-Loop Pathways

Medium-chain fatty acids (MCFAs), including caproate and caprylate, are promising biobased products with high energy density, hydrophobicity, and chemical conversion value, serving as key intermediates linking organic waste valorization to circular economy development. Compared to conventional anaerobic digestion for methane, chain elongation (CE) via reverse β-oxidation (RBO) converts short-chain intermediates (e.g., acetate, lactate, ethanol) into higher-value carboxylic acids, offering a novel route for resource recovery from sewage sludge, food waste, agricultural residues, livestock manure, and high-strength organic wastewater. However, natural mixed-culture CE systems face constraints from substrate composition fluctuations, electron donor competition, methanogenic carbon diversion, insufficient product selectivity, product toxicity, and high separation costs, hindering stable, efficient, and targeted MCFA production. This review systematically summarizes the metabolic mechanisms, artificial regulation strategies, and engineering bottlenecks in CE-based MCFA production, emphasizing directed recovery of carbon and electron resources from organic wastes. Future directions include stable continuous-flow operation, product separation and recovery, techno-economic assessment, and life cycle evaluation. The review aims to provide insights for high-value organic waste utilization and synergistic optimization of carbon and energy recovery.

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SCIENCE CHINA Materials•2026•DOI: 10.1007/s40843-025-3995-6

Pore-Engineering of Single-Site Ti(IV) Embedded Zr-MOFs for Enhanced Catalytic Hydroboration of Large-Size Carbonyl Substrates

The deployment of single-site metal catalytic nodes into zirconium-based metal-organic frameworks (Zr-MOFs) offers vast advantages in catalytic recyclability, product separation, and mechanistic analysis, underscoring their paramount significance in heterogeneous catalysis. Nonetheless, their occupation within pores/channels usually diminishes mass transfer and catalytic efficiency during reactions such as the hydroboration of carbonyl compounds, especially for bulkier substrates. To address this issue, three microporous single-site Ti(IV) embedded Zr-MOFs with sequentially extended ligand arms are novelly synthesized to enable precise pore modulation ranging from 9.04, 10.12, to 11.18 Å. The catalytic performance is investigated using eight carbonyl compounds of varying sizes and four additional larger-scale substrates, which demonstrates that the catalytic efficiency is increased through pore size regulation, yet still away from optimal catalytic performance. Then a further strategy was shifted to the linker installation of linear dicarboxylate ligands chelated single-site Ti(IV) within coordination-unsaturated windows of mesoporous Zr-MOFs, and the result elucidates that the obtained catalyst exhibits superior catalytic efficiency (all exceeding 90%) while preserving the inherent mesoporosity of Zr-MOFs with a pore size of approximately 21.73 Å. We believe this research provides critical guidance for future research on structural design and catalytic optimization of MOFs, opening new avenues in heterogeneous catalysis.

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