Bioresource Technology最新文献_第6页

Immobile iron-rich particles enhance simultaneous nitrogen removal and phosphorus retention in treatment wetlands 固定的富铁颗粒增强了处理湿地中氮和磷的同时去除

IF 9 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology

Pub Date : 2026-04-01 Epub Date: 2026-01-29 DOI: 10.1016/j.biortech.2026.134129

Qingyu Xia , Jizhen Li , Qian Li , Zhen Hu , Haiming Wu , Huijun Xie , Jiaxing Lu , Huaqing Liu , Jian Zhang

Eutrophication control requires cost-effective and sustainable technologies capable of simultaneously removing nitrogen and phosphorus from wastewater treatment plant (WWTP) effluents. Widely used post-treatment systems, treatment wetlands (TWs) typically exhibit limited nutrient removal because of imbalances in electron supply and demand, and rapid saturation of substrate adsorption capacity. In this study, immobile iron-rich particles (IIRPs) were introduced into TWs via a drainage-injection strategy to enhance nutrient removal from municipal WWTP effluent. Following the start-up phase, the IIRP-amended TWs consistently achieved effluent concentrations that met the target quasi-Class IV surface water quality standards (TN ≤ 10 mg L⁻¹; TP ≤ 0.3 mg L⁻¹) for 300 days of continuous operation. The enhanced NH₄⁺-N and TN removal with iron-rich particles amendment could not be attributed to nitrification or anammox, as evidenced using qPCR, metagenomic binning, and removal profiles. Instead, Fe–N redox-coupling processes, including Fe(III) reduction-driven and Fe(II) oxidation-driven nitrogen-removal pathways, contributed to enhanced nitrogen removal. The IIRPs amendment increased the equilibrium phosphorus adsorption capacity of wetland substrate by threefold, and the improved phosphorus retention was attributed to Fe–P interactions. These findings reveal a coupled Fe–N–P mechanism that enables efficient and stable nutrient removal and provide a mechanistic foundation for developing low-carbon, sustainable strategies to upgrade existing TWs for advanced wastewater polishing.

控制富营养化需要具有成本效益和可持续的技术，能够同时从污水处理厂（污水处理厂）流出物中去除氮和磷。由于电子供需失衡和底物吸附能力迅速饱和，处理湿地（TWs）通常表现出有限的营养物去除。在本研究中，通过排水-注入策略将固定富铁颗粒（IIRPs）引入TWs，以提高城市污水处理厂出水的营养去除效果。在启动阶段之后，经过iirp修正的TWs连续运行300天，出水浓度始终达到准IV类地表水质量标准（TN≤10 mg L - 1; TP≤0.3 mg L - 1）。通过qPCR、宏基因组分组和去除谱可以证明，富铁颗粒改性对NH4+-N和TN的去除效果增强，不能归因于硝化或厌氧氨氧化。相反，Fe - n氧化耦合过程，包括Fe（III）还原驱动和Fe（II）氧化驱动的脱氮途径，有助于增强氮的去除。IIRPs的添加使湿地基质的平衡磷吸附量增加了3倍，其改善的磷保留归因于Fe-P的相互作用。这些发现揭示了Fe-N-P耦合机制，可以实现高效稳定的营养物去除，并为开发低碳、可持续的策略来升级现有的TWs进行高级废水抛光提供了机制基础。

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引用次数: 0

Unveiling the mechanisms of mechanical stirring for enhanced performance and stability of algal-bacterial flocs treating low C/N synthetic wastewater 揭示了机械搅拌提高藻菌絮凝体处理低碳氮比合成废水性能和稳定性的机理

IF 9 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology

Pub Date : 2026-04-01 Epub Date: 2026-02-09 DOI: 10.1016/j.biortech.2026.134175

Jun-Jie Gu , Bin-Di Mao , Xiao-Xiao Dou , Bin-Xin Zhang , Jia-Wei Xu , Chun-Wan Fu , Bang-Jie Lan , Xin-Jie Zhang , Zhe Xu , Feng Gao

Algal-bacterial symbiotic systems (ABS) represent an environmentally sustainable wastewater treatment technology with significant application potential, though achieving stable and efficient operation remains a critical research challenge. This 180-day comparative study systematically investigated the performance differences and underlying mechanisms between mechanically stirred and aerated algal-bacterial symbiotic flocs (ABF) cultured in low C/N ratio wastewater. The results demonstrate that mechanical stirring enhances symbiotic interactions between microalgae and bacteria, leading to significantly improved performance metrics including higher biomass concentration (3.5 g/L), elevated dissolved oxygen levels (10.3 mg/L), increased lipid content (58.4%) and lipid productivity (9.3 mg/L/d), along with superior settling characteristics as evidenced by the reduced sludge volume index (80.7 mL/g). During Phase Ⅳ, the stirred ABFs exhibited exceptional contaminant removal efficiencies, achieving 98.2% ammonium nitrogen, 83.2% total nitrogen, and 89.7% chemical oxygen demand removal. Extracellular polymeric substance (EPS) analysis revealed stimulated secretion under stirring conditions (222.3 mg/g), with tight-bound EPS (TB-EPS) predominating, significantly enhancing floc structural stability. Metagenomic analysis demonstrated that stirring enriched functional genera like Thauera and Rubrivivax, strengthening denitrification and organic degradation capacities, while activating key pathways such as the TCA cycle and nitrogen metabolism, upregulating the abundance of EPS synthesis-related genes (e.g., galU), elucidating the molecular mechanisms underlying efficient nutrient removal and floc stability. This study presents an optimized strategy for establishing high-performance ABS in low C/N ratio wastewater treatment, offering both environmental sustainability and economic viability.

藻-细菌共生系统（ABS）是一种具有环境可持续性的污水处理技术，具有巨大的应用潜力，但如何实现稳定高效的运行仍是一个关键的研究挑战。这项为期180天的比较研究系统地研究了在低碳氮比废水中培养的机械搅拌和曝气藻菌共生絮凝体（ABF）的性能差异及其机制。结果表明，机械搅拌增强了微藻与细菌之间的共生相互作用，显著改善了性能指标，包括更高的生物量浓度（3.5 g/L）、更高的溶解氧水平（10.3 mg/L）、更高的脂质含量（58.4%）和脂质生产率（9.3 mg/L/d），以及污泥体积指数（80.7 mL/g）的降低所证明的卓越沉降特性。在Ⅳ阶段，搅拌ABFs表现出优异的污染物去除率，铵态氮去除率为98.2%，总氮去除率为83.2%，化学需氧量去除率为89.7%。细胞外聚合物（EPS）分析显示，在搅拌条件下刺激分泌（222.3 mg/g），以紧密结合的EPS （TB-EPS）为主，显著增强了絮凝体结构的稳定性。宏基因组分析表明，搅拌可以丰富Thauera和Rubrivivax等功能属，增强其反硝化和有机降解能力，同时激活TCA循环和氮代谢等关键途径，上调EPS合成相关基因（如galU）的丰度，从而阐明了有效去除营养物质和絮凝体稳定性的分子机制。本研究提出了在低碳氮比废水处理中建立高性能ABS的优化策略，同时提供了环境可持续性和经济可行性。

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引用次数: 0

Differential tolerance and response of chain-elongation bacteria and methanogens to undissociated n-octanoic acid: Protective layer, membrane stability, and energy metabolism 链伸长细菌和产甲烷菌对未解离的正辛酸的不同耐受性和响应：保护层、膜稳定性和能量代谢

IF 9 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology

Pub Date : 2026-04-01 Epub Date: 2026-01-20 DOI: 10.1016/j.biortech.2026.134057

Zimu Li , Xiyang Lu , Shiling Xu , Yuhan Wang , Shuang Qiu , Jiawei Bai , Shijian Ge

In medium-chain carboxylic acids (MCCAs) biosynthesis, methanogens compete with chain-elongating bacteria (CEB) for substrates. While undissociated MCCAs inhibit methanogens, their differential effects on methanogens and CEB remain unclear. To address this, our study elucidated their differential tolerances to undissociated n-octanoic acid (UnOA). CEB retained superior activity at 0.2–0.8 mM UnOA, whereas methanogens were severely inhibited primarily due to disrupted electron transport and energy metabolism, as evidenced by the decrease in substrate utilization (20.04 % vs 40.10 %) and metabolite production (14.31 % vs 68.82 %). CEB’s tolerance was attributed to: (1) extracellular protection via c-di-GMP-induced extracellular polymeric substances (EPS) secretion, (2) intrinsic membrane stability from a higher saturated: unsaturated fatty acid ratio and average chain length, and (3) superior energy metabolism via multiple ATP synthesis pathways and intracellular pH homeostasis. Applying 0.2–0.6 mM UnOA at pH 6.0–6.5 selectively suppressed methanogens, validating a strategy to promote MCCAs production.

在中链羧酸（MCCAs）生物合成中，产甲烷菌与链延长菌（CEB）争夺底物。虽然未解离的mcca抑制产甲烷菌，但它们对产甲烷菌和CEB的不同作用尚不清楚。为了解决这个问题，我们的研究阐明了它们对未解离的正辛酸（UnOA）的不同耐受性。CEB在0.2-0.8 mM UnOA范围内保持了较强的活性，而产甲烷菌受到严重抑制，主要是由于电子传递和能量代谢受到干扰，这可以从底物利用率（20.04%比40.10%）和代谢物产量（14.31%比68.82%）的下降中得到证明。CEB的耐受性归因于：(1)c-di- gmp诱导的细胞外聚合物质（EPS）分泌的细胞外保护，(2)较高的饱和和不饱和脂肪酸比例和平均链长所带来的内在膜稳定性，以及(3)通过多种ATP合成途径和细胞内pH稳态进行的优越的能量代谢。在pH值为6.0-6.5的条件下施用0.2-0.6 mM UnOA选择性抑制产甲烷菌，验证了促进mcca生产的策略。

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引用次数: 0

High-efficiency restoration of stone cultural relics via immobilized carbonic anhydrase on magnetic graphite oxide 磁性氧化石墨固定化碳酸酐酶高效修复石质文物

IF 9 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology

Pub Date : 2026-04-01 Epub Date: 2026-02-03 DOI: 10.1016/j.biortech.2026.134155

Yaofeng Hu , Yifan Gui , Wei Li , Cuiling Gong , Ziqi Hou , Tong Shu , Ya Wu , Gen Lu , Longjiang Yu

Stone cultural relics face persistent threats from weathering and erosion processes, whereas conventional restoration techniques frequently induce material incompatibility and secondary damage. Enzyme-induced calcium carbonate precipitation (EICP) offers a solution by forming protective layers, but free enzymes suffer from short lifespan and poor stability. Therefore, this study proposes a strategy that the α-carbonic anhydrase from Helicobacter pylori strain 26695 (HpCA) was immobilized on magnetic graphene oxide (mGO) to obtain the immobilized enzyme mGO@HpCA for stone relic restoration. mGO serves as both a stabilization matrix for CA and a nanoscale dispersant for uniform enzyme distribution, while also providing nucleation sites for denser calcium carbonate layers. Compared to free enzymes, mGO@HpCA achieved 1.87 times greater mineral mass accumulation after 48 h, reduced water absorption by 75.7 % and air permeability by 27.7 %, and improved acid resistance, with 49.5 % less mass loss after 120 h of acid immersion. These features effectively safeguard stone relics against rainwater, soluble salts, and climate change effects. This approach provides an efficient, eco-friendly, and non-destructive conservation method.

石质文物面临着风化和侵蚀过程的持续威胁，而传统的修复技术往往会导致材料不相容和二次损伤。酶诱导碳酸钙沉淀（EICP）通过形成保护层提供了一种解决方案，但游离酶的寿命短，稳定性差。因此，本研究提出将幽门螺杆菌26695菌株α-碳酸酐酶（HpCA）固定化在磁性氧化石墨烯（mGO）上，得到用于石质文物修复的固定化酶mGO@HpCA。氧化镁既可以作为CA的稳定基质，又可以作为酶均匀分布的纳米级分散剂，同时还可以为致密的碳酸钙层提供成核位点。与游离酶相比，mGO@HpCA在48 h后的矿物质量积累量增加了1.87倍，吸水率降低了75.7%，透气性降低了27.7%，耐酸性提高，浸泡120 h后的质量损失减少了49.5%。这些特点有效地保护了石质文物免受雨水、可溶性盐和气候变化的影响。这种方法提供了一种高效、环保、非破坏性的保护方法。

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引用次数: 0

Chiral pesticides stereoselectively accelerate N2O emission through aerobic denitrification 手性农药通过好氧反硝化作用立体选择性加速N2O排放

IF 9 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology

Pub Date : 2026-04-01 Epub Date: 2026-02-03 DOI: 10.1016/j.biortech.2026.134154

Yaxin Wang , Yifan Xiao , Ruixin Li , Mark Bartlam , Yingying Wang

As farmland represents the largest nitrous oxide (N₂O) emitter, widely used chiral pesticides frequently coexist with N₂O. To explore the underlying molecular mechanisms of chiral pesticides regulating N₂O emissions, this study experimented with Paracoccus denitrificans PD1222 on anaerobic/aerobic denitrification under cis-epoxiconazole (EPO) stress. The (+)-EPO increased 13.51-fold N₂O emissions under anaerobic denitrification by inhibiting the denitrification genes, while (−)-EPO merely enhanced 4.22-fold N₂O emissions through improving electron transfer and nitrous oxide reductase assembly. Anaerobic conditions suppressed glucose metabolism and NADH production, disrupting the energy supply for denitrification under EPO stress. Aerobic conditions hindered electron transfer and intracellular iron transport, reducing denitrifying enzyme activity and causing a further 1.29–10.47-fold increase in N₂O emissions and extra nitrite accumulation. These findings revealed that oxygen intensified the ecological risk of cis-epoxiconazole monomers stimulating N₂O emissions and underscore the potential risks of agrochemical applications to climate change and ecosystem stability.

由于农田是最大的氮氧化物排放源，广泛使用的手性农药经常与氮氧化物共存。为探究手性农药调控N2O排放的潜在分子机制，本研究以反硝化副球菌PD1222为实验材料，对顺式环氧康唑（EPO）胁迫下厌氧/好氧反硝化进行了研究。在厌氧反硝化过程中，(+)-EPO通过抑制反硝化基因使N2O排放量增加13.51倍，而(−)-EPO仅通过改善电子转移和氧化亚氮还原酶组装使N2O排放量增加4.22倍。厌氧条件抑制了葡萄糖代谢和NADH的产生，破坏了EPO应激下反硝化的能量供应。好氧条件阻碍了电子传递和细胞内铁运输，降低了反硝化酶的活性，导致N2O排放量和亚硝酸盐额外积累增加1.29 - 10.47倍。这些研究结果表明，氧加剧了顺式环氧康唑单体刺激N2O排放的生态风险，并强调了农化应用对气候变化和生态系统稳定的潜在风险。

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引用次数: 0

Bio-upcycling of bioplastic wastes into polyhydroxyalkanoates 生物塑料废物的生物升级回收成聚羟基烷酸酯

IF 9 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology

Pub Date : 2026-04-01 Epub Date: 2026-01-29 DOI: 10.1016/j.biortech.2026.134120

Rawitsara Intasit , Suchada Chanprateep Napathorn , Beom Soo Kim

This study presents a sustainable bioconversion strategy for upcycling biodegradable plastics into polyhydroxyalkanoates (PHAs) using Paracoccus sp. LL1. Alkaline hydrolysis was used to depolymerize three examples of bioplastics: poly(lactic acid) (PLA), poly(butylene succinate) (PBS), and poly(butylene adipate-co-terephthalate) (PBAT). The resultant hydrolysates were evaluated as carbon substrates for microbial PHA production. Under optimal conditions, PLA and PBS exhibited 100% hydrolysis, while PBAT demonstrated a 69% hydrolysis efficiency. PLA hydrolysate produced the highest biomass concentration (7.37 g/L) and PHA production (1.88 g/L), followed by PBS (0.98 g/L) and PBAT (0.27 g/L), according to shake-flask cultivation. During flask-scale cultivation with 50 g/L bioplastic hydrolysate, the maximum PHA content reached 26% (w/w). The polymer was primarily composed of 3-hydroxybutyrate (3HB) and less than 3% 3-hydroxyvalerate (3HV). Batch cultivation in a 5 L bioreactor using PLA hydrolysate further enhanced biomass and PHA production to 11.3 g/L and 3.69 g/L, respectively, corresponding to a PHA content of 32.9% at 96 h. Fourier transform infrared spectroscopy confirmed the characteristic ester carbonyl (CO) and CO stretching vibrations of PHA, while thermogravimetric analysis indicated high thermal stability up to 250 °C. Overall, this study demonstrates the technical feasibility of converting bioplastic hydrolysates into value-added PHAs, offering an integrated approach for biodegradable plastic waste valorization within a circular bioeconomy framework.

本研究提出了一种可持续的生物转化策略，利用副球菌sp. LL1将可生物降解塑料升级为聚羟基烷酸酯（PHAs）。用碱性水解法解聚了三种生物塑料：聚乳酸（PLA）、聚丁二酸丁二酯（PBS）和聚己二酸丁二酯（PBAT）。所得到的水解产物被评价为微生物PHA生产的碳底物。在最佳条件下，PLA和PBS的水解率为100%，PBAT的水解率为69%。摇瓶培养结果显示，PLA水解产物的生物量浓度最高（7.37 g/L）， PHA产量最高（1.88 g/L），其次是PBS （0.98 g/L）和PBAT （0.27 g/L）。用50 g/L生物塑料水解物培养时，PHA含量最高可达26% （w/w）。该聚合物主要由3-羟基丁酸酯（3HB）和不到3%的3-羟基戊酸酯（3HV）组成。利用聚乳酸水解物在5 L生物反应器中分批培养，进一步提高了聚乳酸的生物量和PHA产量，分别达到11.3 g/L和3.69 g/L， 96 h时PHA含量为32.9%。傅里叶变换红外光谱证实了PHA的特征酯羰基（CO）和CO拉伸振动，热重分析表明PHA在高达250°C的高温下具有较高的热稳定性。总体而言，本研究证明了将生物塑料水解物转化为增值pha的技术可行性，为在循环生物经济框架内实现生物可降解塑料废物增值提供了一种综合方法。

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引用次数: 0

Membrane and co-culture engineering for high-level curcumin production in Escherichia coli 大肠杆菌高产姜黄素的膜与共培养工程

IF 9 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology

Pub Date : 2026-04-01 Epub Date: 2026-01-29 DOI: 10.1016/j.biortech.2026.134116

Yiyang Shi, Tong Shi, Jinghua Yu, Xiaolin Shen, Jia Wang, Xinxiao Sun, Qipeng Yuan

Curcuminoids, the major bioactive compounds of Curcuma longa, possess broad pharmacological activities including anticancer, antioxidant, and anti-inflammatory effects, making them valuable for pharmaceutical, nutraceutical, and cosmetic applications. Microbial biosynthesis provides a sustainable alternative. However, the efficiency remains limited due to the poor enzyme expression and the intrinsic hydrophobicity of curcuminoids, which causes intracellular accumulation and metabolic stress. Here, we develop a microbial platform that leverages chaperone-assisted enzyme folding, outer membrane vesicle (OMV)-mediated secretion, and modular co-culture engineering to enhance curcuminoid production in Escherichia coli. Co-expression of molecular chaperones improves the solubility and catalytic performance of plant-derived curcumin synthases, while the OMV system facilitates partial export of hydrophobic products, alleviating cellular burden. By dividing the biosynthetic pathway into upstream ferulic acid and downstream curcumin modules, and implementing carbon-source-based metabolic partitioning, we achieve a relatively stable co-culture, resulting in the production of 978 mg/L in 3 L fed-batch bioreactor, the highest titer reported to date. Our work establishes a versatile framework for microbial synthesis of hydrophobic natural products.

姜黄素是姜黄的主要生物活性化合物，具有广泛的药理活性，包括抗癌、抗氧化和抗炎作用，使其在制药、营养保健和化妆品应用中具有重要价值。微生物生物合成提供了一种可持续的替代方案。然而，由于酶表达差和姜黄素固有的疏水性，导致细胞内积累和代谢应激，效率仍然有限。在这里，我们开发了一个微生物平台，利用伴侣辅助酶折叠、外膜泡（OMV）介导的分泌和模块化共培养工程来提高大肠杆菌中姜黄素的产量。分子伴侣的共表达提高了植物源姜黄素合成酶的溶解度和催化性能，而OMV系统促进了部分疏水产物的出口，减轻了细胞负担。通过将生物合成途径划分为上游阿魏酸和下游姜黄素模块，并实施基于碳源的代谢分配，我们实现了相对稳定的共培养，在3l进料间歇式生物反应器中产生了978 mg/L的滴度，这是迄今为止报道的最高滴度。我们的工作为微生物合成疏水天然产物建立了一个通用的框架。

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引用次数: 0

Convergent enrichment of core functional guilds involved in Fe-N metabolism in anammox and activated sludge: Insights into genome-resolved metagenomics 厌氧氨氧化和活性污泥中参与铁氮代谢的群落的聚合富集：基因组解析宏基因组学的见解

IF 9 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology

Pub Date : 2026-04-01 Epub Date: 2026-01-30 DOI: 10.1016/j.biortech.2026.134125

Hui Sun , Ying Han , Shiquan Ren , Xinrui Zhang , Xinru Li , Peng Bi , Long Chen , Liang Zhu , Guangchao Yang , Jingwei Ma , Qiulai He

The coupled process of ferric ammonium oxidation (Feammox) and nitrate-dependent ferrous oxidation (NDFO) is a cost-effective nitrogen removal strategy, yet insufficient molecular evidence supports its microbial mechanisms. This study successfully established anaerobic Fe-N coupling systems using anammox sludge and activated sludge as inoculum. Batch experiments and microbial community analysis revealed that two systems achieved similar nitrogen removal, dominated by anammox and Feammox performed by anammox bacteria (AnAOB), with a minor NDFO contribution, and convergently enriched core functional guilds under identical environmental pressures. Genome-resolved metagenomics further indicated that the porin-cytochrome protein complex associated with extracellular electron transfer co-occurred with anammox genes in Brocadia sapporoensis, suggesting its potential Feammox capability. Meanwhile, the iron oxidation gene Cyc2 co-occurred with mtr pathway homologs and complete denitrification genes in IGN3 sp900696555, suggesting its role in NDFO. This genomic evidence supports their dual metabolic capabilities, providing new insights into nitrogen removal in the coupled Feammox-NDFO process.

铁铵氧化（Feammox）和硝酸盐依赖的亚铁氧化（NDFO）耦合过程是一种具有成本效益的脱氮策略，但支持其微生物机制的分子证据不足。本研究以厌氧氨氧化污泥和活性污泥为接种物，成功建立了厌氧铁氮耦合系统。批量实验和微生物群落分析表明，在相同的环境压力下，两种系统的脱氮效果相似，以厌氧氨氧化菌（AnAOB）和厌氧氨氧化菌（anammox）为主要脱氮菌，NDFO贡献较小，并逐渐富集核心功能区。基因组解析宏基因组学进一步表明，与细胞外电子转移相关的孔蛋白-细胞色素蛋白复合物与厌氧氨氧化基因共存，表明其具有潜在的厌氧氨氧化能力。同时，铁氧化基因Cyc2与mtr通路同源基因和完全反硝化基因在IGN3 sp900696555中共同出现，提示其在NDFO中的作用。这一基因组证据支持了它们的双重代谢能力，为Feammox-NDFO耦合过程中的氮去除提供了新的见解。

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引用次数: 0

Various light sources-assisted photodegradation of Rhodamine B using magnetically separable and reusable MnFe2O4/Cdots synthesized utilizing Moringa oleifera leaf extract and watermelon peel 以辣木叶提取物和西瓜皮为原料合成的磁性可分离可重复使用MnFe2O4/Cdots在不同光源辅助下光降解罗丹明B

IF 9 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology

Pub Date : 2026-04-01 Epub Date: 2026-01-19 DOI: 10.1016/j.biortech.2026.134044

Naqwa Mumtazah Purba , Kurnia , Nurul Imani Istiqomah , Nugraheni Puspita Rini , Larrisa Jestha Mahardhika , Dyah Ayu Larasati , Ranti Widia Utami , Candra Kurniawan , Julia Angel , Edi Suharyadi

Persistent organic dyes such as Rhodamine B (RhB) pose a serious threat to water quality due to their toxicity at trace concentrations and resistance to biodegradation. In this study, magnetic MnFe₂O₄/Cdots (MFC) nanocomposites were synthesized via a green coprecipitation method using Moringa oleifera leaf extract and watermelon peel waste as sustainable precursors. The nanocomposites were prepared by sonication with Cdot concentrations of 10, 15, 20, 25, and 30 mL, referred to as MFC1-MFC5. X-ray diffraction confirmed a single-phase cubic spinel structure, while morphological analysis revealed nearly spherical, semi-uniform particles with slight aggregation and sizes of 12–14.1 nm, strongly attached to Cdots. Increasing Cdot concentration induced a redshift in absorption and band gap narrowing. The nanocomposites exhibited saturation magnetization values of 14–18.9 emu/g, indicating good magnetic properties. Photocatalytic performance improved with increasing Cdots concentration, resulting in enhanced RhB degradation efficiency. Under ultraviolet irradiation for 90 min, MFC4 achieved the highest degradation efficiency of 98.56%, while degradation efficiencies of 76.8% under visible light and 85.7% under sunlight were obtained. Furthermore, the magnetic nanocomposites were easily recovered using an external magnetic field and maintained high degradation efficiency over multiple cycles, highlighting their potential as eco-friendly, magnetically separable, and reusable photocatalysts for wastewater treatment.

罗丹明B （Rhodamine B, RhB）等持久性有机染料因其微量毒性和生物降解性对水质构成严重威胁。本研究以辣木叶提取物和西瓜皮废料为可持续前驱物，采用绿色共沉淀法合成了磁性MnFe2O4/Cdots （MFC）纳米复合材料。采用超声法制备Cdot浓度分别为10、15、20、25和30 mL的纳米复合材料，称为MFC1-MFC5。x射线衍射证实其为单相立方尖晶石结构，形态分析显示其为近球形、半均匀、微聚集的颗粒，尺寸为12 ~ 14.1 nm，与Cdots紧密附着。增加Cdot浓度引起吸收红移和带隙缩小。纳米复合材料的饱和磁化强度为14 ~ 18.9 emu/g，具有良好的磁性能。光催化性能随着Cdots浓度的增加而提高，从而提高了RhB的降解效率。在紫外线照射90 min下，MFC4的降解效率最高，达到98.56%，可见光下的降解效率为76.8%，日光下的降解效率为85.7%。此外，磁性纳米复合材料可以很容易地利用外磁场回收，并在多次循环中保持高降解效率，突出了它们作为生态友好、磁可分离和可重复使用的废水处理光催化剂的潜力。

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引用次数: 0

Lignin upgrading for sustainable materials and chemicals: From waste to functional bioplastics 可持续材料和化学品的木质素升级：从废物到功能性生物塑料

IF 9 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology

Pub Date : 2026-04-01 Epub Date: 2026-01-24 DOI: 10.1016/j.biortech.2026.134091

Ying-Chun Xu, Shuang-Lin Zou, Qiang Wang, Ling-Ping Xiao

The escalating environmental crisis caused by fossil-based plastics underscores an urgent need for sustainable alternatives. Lignin, the most abundant aromatic biopolymer, presents a promising renewable feedstock for manufacturing bioplastics and platform chemicals. Nevertheless, its inherent structural heterogeneity and tendency toward irreversible condensation during deconstruction have historically hindered its high value-added utilization. This review explores advanced strategies designed to overcome these challenges by preserving lignin’s native functionality during upstream processing. We first critically evaluate innovative fractionation techniques, including deep eutectic solvents and reductive catalytic fractionation. Subsequently, we outline foresighted strategies to conversion pathways transforming lignin into biobased precursors and performance-enhancing materials, encompassing “biological funnel”, catalytic depolymerization, and direct macromolecular utilization. Additionally, we conduct a techno-economic analysis and life cycle assessment for the realization of scalable and practical lignin bioplastics. Ultimately, this review presents a roadmap for lignin valorization and identified strategies to overcome existing challenges, providing valuable insights for advancing the field in lignin and supporting future innovations in bioplastics.

化石基塑料造成的不断升级的环境危机凸显了对可持续替代品的迫切需求。木质素是最丰富的芳香族生物聚合物，是制造生物塑料和平台化学品的一种有前途的可再生原料。然而，其固有的结构异质性和解构过程中不可逆凝结的倾向一直阻碍着其高附加值的利用。这篇综述探讨了通过在上游加工过程中保留木质素的天然功能来克服这些挑战的先进策略。我们首先批判性地评价创新的分馏技术，包括深共晶溶剂和还原催化分馏。随后，我们概述了将木质素转化为生物基前体和性能增强材料的转化途径的前瞻性策略，包括“生物漏斗”，催化解聚和直接大分子利用。此外，我们还进行了技术经济分析和生命周期评估，以实现可扩展和实用的木质素生物塑料。最后，本文提出了木质素增值的路线图，并确定了克服现有挑战的策略，为推进木质素领域和支持未来生物塑料的创新提供了有价值的见解。

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