4区环境科学与生态学

Water SA Pub Date : 2026-05-09 DOI: 10.3390/w18101130

Biyou Li, Jingyun Huang, Qifen Luo, Yuan Zeng, Zuoxiang Zhang, Jianshu Zhou, Yizhen Cheng

{"title":"Enhanced Antibiotic Removal from Water by Alkali-Modified Porous Biochar: Performance and Underlying Mechanisms","authors":"Biyou Li, Jingyun Huang, Qifen Luo, Yuan Zeng, Zuoxiang Zhang, Jianshu Zhou, Yizhen Cheng","doi":"10.3390/w18101130","DOIUrl":"https://doi.org/10.3390/w18101130","url":null,"abstract":"This study prepared alkali-modified porous biochar (KABC-1h) from straw via KOH impregnation and pyrolysis and systematically investigated its adsorption performance toward tetracycline (TC) in water. The optimal modification condition was determined as 2 mol/L KOH impregnation for 1 h followed by pyrolysis at 600 °C. Characterization results showed that alkali modification significantly increased the BET-specific surface area to 132.56 m2/g, enriched hierarchical micro-mesoporous structure, and introduced abundant oxygen-containing functional groups. The maximum adsorption capacity of KABC-1h for TC reached 21.60 mg/g, much higher than 14.11 mg/g of unmodified biochar (BC). Adsorption kinetics followed the pseudo-second-order model well, revealing that chemisorption dominated the rate-controlling step. Adsorption isotherms fitted the Freundlich model better, indicating multilayer heterogeneous adsorption on the biochar surface. Mechanism studies confirmed that TC adsorption was realized mainly through hydrogen bonding, π-π interaction, and surface complexation, whereas electrostatic interaction played a minor role. Moreover, KABC-1h exhibited stable adsorption efficiency over a wide pH range (4.5–11.5) and strong anti-interference ability against coexisting ions, with 59.0% removal efficiency retained after three regeneration cycles. This work demonstrates that KOH-modified porous biochar is a promising adsorbent for efficient TC removal from aqueous solution, providing a feasible strategy for agricultural waste valorization and antibiotic wastewater treatment.","PeriodicalId":23623,"journal":{"name":"Water SA","volume":"18 10","pages":"1130-1130"},"PeriodicalIF":0.0,"publicationDate":"2026-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147967105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impacts of Extreme Temperature and Drought on Water Quality and Phytoplankton Biomass in Nanwan Reservoir (China) 极端温度和干旱对南湾水库水质和浮游植物生物量的影响

4区环境科学与生态学

Water SA Pub Date : 2026-02-04 DOI: 10.3390/w18030411

Kunjie Wu, Zhiguo Hu, Yuan Tian, Xin Liu, Chenxi Ju, Chaoqun Su, Yuanye Ma, Huanan Gao, Liangjie Zhao, Xusheng Guo

{"title":"Impacts of Extreme Temperature and Drought on Water Quality and Phytoplankton Biomass in Nanwan Reservoir (China)","authors":"Kunjie Wu, Zhiguo Hu, Yuan Tian, Xin Liu, Chenxi Ju, Chaoqun Su, Yuanye Ma, Huanan Gao, Liangjie Zhao, Xusheng Guo","doi":"10.3390/w18030411","DOIUrl":"https://doi.org/10.3390/w18030411","url":null,"abstract":"Climate change has led to increasingly frequent and unpredictable droughts and high-temperature events, creating extreme conditions that profoundly impact the productivity of freshwater ecosystems. In this study, we evaluated the effects of extreme temperature and drought events on Nanwan Reservoir, a large, deep body of water in Xinyang, China, by assessing water quality and phytoplankton biomass. Field investigations were conducted during both high-temperature and drought (HTD) conditions in 2019 and normal-temperature and non-drought (NTND) conditions in 2020. HTD conditions significantly disrupted the thermocline and oxycline structures, leading to prolonged stratification during this period. Although phosphorus concentrations remained relatively stable across both periods, nitrogen levels were markedly lower during HTD events, indicating a possible shift in nutrient limitation from phosphorus to nitrogen. Additionally, a complex relationship between environmental variables and phytoplankton biomass was observed under HTD conditions. These findings advance our understanding of primary production responses to extreme weather events in Nanwan Reservoir, highlighting the importance of incorporating this knowledge into water resource management and ecological conservation strategies.","PeriodicalId":23623,"journal":{"name":"Water SA","volume":"18 3","pages":"411-411"},"PeriodicalIF":0.0,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.mdpi.com/2073-4441/18/3/411/pdf?version=1770610074","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147878065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pre-Filter Regulation Strategies and Deactivation Mechanisms of Filter Media in Water Treatment 水处理中过滤介质的预过滤调节策略和失活机制

4区环境科学与生态学

Water SA Pub Date : 2026-01-05 DOI: 10.3390/w18010127

Chaochang Jiang, Xiaowei Lei, Renpeng Zhou, Bingzhi Liu, Junxia Liu, Wei Song, Zhihong Wang

{"title":"Pre-Filter Regulation Strategies and Deactivation Mechanisms of Filter Media in Water Treatment","authors":"Chaochang Jiang, Xiaowei Lei, Renpeng Zhou, Bingzhi Liu, Junxia Liu, Wei Song, Zhihong Wang","doi":"10.3390/w18010127","DOIUrl":"https://doi.org/10.3390/w18010127","url":null,"abstract":"In the context of micro-polluted water sources, the performance decline of filtration units is a major challenge for the operational management of water supply plants. Therefore, it is necessary to systematically analyze the mechanism underlying the decline in filter media activity and optimize the pre-filtration treatment. This study focuses on waterworks, aiming to enhance filtration performance through filter media modification and a combined coagulant-oxidant strategy. A key innovation of this work is the development of a macro-microscopic correlation evaluation system. The results showed that the modified filter media increased the turbidity removal rate by 10.48% compared to the unmodified media. Furthermore, the combined coagulation–pre-oxidation scheme increased the removal rates for turbidity and UV254 by 3.24% and 19.03%, respectively, compared to the single-process scheme. Combined with filter media characterization results, the deactivation mechanism of filter media can be inferred. During the high-algae period, microorganisms on the filter media generate anaerobic Extracellular Polymeric Substances (EPS), which form a biofilm with bacteria and adhere to the filter media. The viscous matrix of these EPS then encapsulates inorganic substances, resulting in hard-to-remove clumps. These clumps clog pores and hinder the adsorption of subsequent pollutants, ultimately leading to continuous deterioration in filter media performance until failure.","PeriodicalId":23623,"journal":{"name":"Water SA","volume":"18 1","pages":"127-127"},"PeriodicalIF":0.0,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147916729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

pH-Dependent Reactivity, Radical Pathways, and Nitrosamine Byproduct Formation in Peroxynitrite-Mediated Advanced Oxidation Processes 在过氧亚硝酸盐介导的高级氧化过程中，ph依赖的反应活性、自由基途径和亚硝胺副产物的形成

4区环境科学与生态学

Water SA Pub Date : 2025-12-31 DOI: 10.3390/w18010097

Zhe Chen, Dandan Rao, Jian Zhang, Bo Sun

{"title":"pH-Dependent Reactivity, Radical Pathways, and Nitrosamine Byproduct Formation in Peroxynitrite-Mediated Advanced Oxidation Processes","authors":"Zhe Chen, Dandan Rao, Jian Zhang, Bo Sun","doi":"10.3390/w18010097","DOIUrl":"https://doi.org/10.3390/w18010097","url":null,"abstract":"Peroxynitrite (ONOOH/ONOO−) is increasingly recognized as a key intermediate in advanced oxidation processes (AOPs), yet its role in water treatment remains insufficiently defined. This study provides mechanistic insights into peroxynitrite-mediated AOPs through competition kinetics method, demonstrating that both decomposition and pollutant degradation are strongly pH-dependent, with ONOOH dominating stability and radical pathways across pH 5.0−9.0, while its decay rate decreases from 1.2 s−1 to 0.0022 s−1. The interplay of HO• and diverse reactive nitrogen species (RNS, including reactive nitrogen radicals and peroxynitrite) dictates pollutant-specific degradation efficiencies, with RNS showing a unique reliance in degrading bisphenol A—contributing up to 66.7% at pH 8.0. Buffer chemistry further modulates these pathways: bicarbonate accelerates peroxynitrite decay via CO2 and CO3•−-mediated acceleration (resulting in a 361.9% increase at pH 9.0), while borate promotes reactive nitrogen radical formation but suppresses HO• contributions. Importantly, peroxynitrite was shown to facilitate N-nitrosodimethylamine formation in the presence of dimethylamine, with yields maximized under alkaline conditions and attenuated by bicarbonate. These quantitative findings underscore the critical roles of pH and buffer chemistry in optimizing peroxynitrite-based water treatment while mitigating byproduct risks.","PeriodicalId":23623,"journal":{"name":"Water SA","volume":"18 1","pages":"97-97"},"PeriodicalIF":0.0,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.mdpi.com/2073-4441/18/1/97/pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147334003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reactivation and Nitrogen Removal Performance of Idle Anammox Sludge Enhanced by Rape Straw Biochar 油菜秸秆生物炭强化厌氧氨氧化污泥的再活化及脱氮性能

4区环境科学与生态学

Water SA Pub Date : 2025-12-20 DOI: 10.3390/w18010018

Qiang Chen, Yi Ding, Zhicheng Xu, H. Zhou, Ruoyu Zhang, Jiao Chen, Yixin Lu, Wenlai Xu

{"title":"Reactivation and Nitrogen Removal Performance of Idle Anammox Sludge Enhanced by Rape Straw Biochar","authors":"Qiang Chen, Yi Ding, Zhicheng Xu, H. Zhou, Ruoyu Zhang, Jiao Chen, Yixin Lu, Wenlai Xu","doi":"10.3390/w18010018","DOIUrl":"https://doi.org/10.3390/w18010018","url":null,"abstract":"Low reactivation efficiency of idle anaerobic ammonia oxidation (anammox) sludge hinders its reapplication. To address this issue, rape straw biochar (RSB) was added in the reactivation process of idle anammox sludge, and its effects on the nitrogen transformation and sludge characteristics were investigated, and the mechanism of RSB to enhance the reactivation performance was explored. Results indicated that adding 5 g/L RSB for 35 days successfully reactivated anammox sludge that had been idle for 270 days. The reactivation time was reduced by 34% compared to the control without RSB. During the stable operation period, the average TN removal efficiency reached 90.6%, and the sludge exhibited higher activity. After completion of reactivation, the specific surface area, total pore volume, and average pore diameter of RSB decreased by 59.4%, 66.9%, and 55.2%, respectively, compared with that before reactivation, and the carbon–oxygen functional groups also changed. RSB not only provided a habitat for the enriched growth of nitrogen transforming functional flora but also possessed the potential to supply sufficient electron donors and acceptors for the nitrogen transforming process, which promoted the synergistic removal of nitrate by denitrification, resulting in an effective enhancement of reactivation efficiency and nitrogen removal performance. The addition of RSB provides a novel strategy to enhance the reactivation efficiency of idle anammox sludge, which is of positive significance in promoting its efficient reuse and stable operation.","PeriodicalId":23623,"journal":{"name":"Water SA","volume":"18 1","pages":"18-18"},"PeriodicalIF":0.0,"publicationDate":"2025-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.mdpi.com/2073-4441/18/1/18/pdf?version=1766225644","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147900117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Migration of Nanoplastic in Soil: Effects of Polymer Properties and Rainfall Conditions 纳米塑料在土壤中的迁移：聚合物性质和降雨条件的影响

4区环境科学与生态学

Water SA Pub Date : 2025-12-11 DOI: 10.3390/w17243512

Fang Wang, Hui Li, Yuchen Zhang, Jiannan Chen, Yuhe Zhang, Sibo Zhang, Bin Wang

{"title":"Migration of Nanoplastic in Soil: Effects of Polymer Properties and Rainfall Conditions","authors":"Fang Wang, Hui Li, Yuchen Zhang, Jiannan Chen, Yuhe Zhang, Sibo Zhang, Bin Wang","doi":"10.3390/w17243512","DOIUrl":"https://doi.org/10.3390/w17243512","url":null,"abstract":"The pervasive presence of nanoplastics (NPs) in the soil environment has been widely documented. However, the mechanisms governing their transport through soil remain poorly understood. This study investigated the migration and vertical distribution of NPs under simulated rainfall, examining the effects of NP properties (concentration, polymer type, aging) and rainfall conditions (duration, pH). The results demonstrated that rainfall facilitated the entry and retention of NPs in soil, with long-term rainfall promoting gradual migration to deeper layers or groundwater. NP mobility was inversely related to their contamination levels. Lower concentrations enhanced downward transport, while higher concentrations led to preferential retention in the topsoil. Due to its hydrophilicity, polyamide (PA) exhibits greater mobility in soil than hydrophobic polystyrene (PS). Both UV aging and acidic rainfall conditions inhibited the migration of NPs, which increased their long-term retention in soil, thereby elevating ecological risk. These results highlight the need for increased attention to the risk of groundwater contamination posed by hydrophilic NPs following long-term rainfall, as well as the threat posed by hydrophobic NPs, particularly after aging and under acidic rainfall conditions, to soil organisms and food safety. Our findings provide critical insights for assessing NP risks in soil environments.","PeriodicalId":23623,"journal":{"name":"Water SA","volume":"17 24","pages":"3512-3512"},"PeriodicalIF":0.0,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.mdpi.com/2073-4441/17/24/3512/pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147330895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the Adsorption of Tetracycline Hydrochloride in Water by Modified Highland Barley Straw Biochar 改性青稞秸秆生物炭对水中盐酸四环素的吸附研究

4区环境科学与生态学

Water SA Pub Date : 2025-11-21 DOI: 10.3390/w17233335

Jiacheng Song, Huijun Xi, Xiaogang Gu, Jian Xiong

{"title":"Study on the Adsorption of Tetracycline Hydrochloride in Water by Modified Highland Barley Straw Biochar","authors":"Jiacheng Song, Huijun Xi, Xiaogang Gu, Jian Xiong","doi":"10.3390/w17233335","DOIUrl":"https://doi.org/10.3390/w17233335","url":null,"abstract":"Global antibiotic pollution (represented by tetracycline hydrochloride, TCH) threatens water environmental safety, and resource recovery of agricultural waste remains a key challenge for sustainable development. Given that utilizing biochar for adsorption is widely recognized as a circular economy-compliant method, this study aimed to verify its applicability in TCH pollution control while recycling agricultural waste by preparing modified biochar from the Xi Zang highland barley straw via chemical activation (KOH, H3PO4, NaHCO3, and ZnCl2) and pyrolysis at 750 °C. Among the products, H3PO4-modified (P-BC) and ZnCl2-modified (Zn-BC) biochars performed best: their abundant micro/mesoporous structures and surface functional groups (–OH/–COOH) enabled excellent TCH adsorption, with the mechanism involving synergy of physical adsorption (dominated by pore filling) and chemical adsorption (hydrogen bonding, electrostatic attraction, cation bridging), alongside multi-layer adsorption. Adsorption was pH-dependent—acidic conditions favored it, while Zn-BC restored efficiency at pH = 9 via Zn2+ bridging. The two biochars were complementary: Zn-BC had higher adsorption capacity, while P-BC showed better stability and ionic interference resistance. Thus, Zn-BC suits high-concentration, low-ionic-strength TCH wastewater, and P-BC is ideal for complex high-ionic-strength water (e.g., industrial/aquaculture wastewater). This study provides theoretical and technical support for high-value utilization of regional agricultural waste and targeted TCH pollution control.","PeriodicalId":23623,"journal":{"name":"Water SA","volume":"17 23","pages":"3335-3335"},"PeriodicalIF":0.0,"publicationDate":"2025-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.mdpi.com/2073-4441/17/23/3335/pdf?version=1763729865","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147333873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Testing Machine Learning and Traditional Models for Tree-Ring-Based scPDSI Streamflow Reconstruction: A 1500-Year Record of the French Broad River, Tennessee, USA 基于树木年轮的scPDSI河流流量重建的机器学习和传统模型测试：美国田纳西州法国Broad河1500年记录

4区环境科学与生态学

Water SA Pub Date : 2025-11-18 DOI: 10.3390/w17223288

Ray Lombardi, Abel Andrés Ramírez Molina, Glenn Tootle

{"title":"Testing Machine Learning and Traditional Models for Tree-Ring-Based scPDSI Streamflow Reconstruction: A 1500-Year Record of the French Broad River, Tennessee, USA","authors":"Ray Lombardi, Abel Andrés Ramírez Molina, Glenn Tootle","doi":"10.3390/w17223288","DOIUrl":"https://doi.org/10.3390/w17223288","url":null,"abstract":"The French Broad River in eastern Tennessee is a critical water resource for the Tennessee Valley Authority’s hydropower and drought relief, yet its instrumental record spans less than a century. To evaluate new dendrochronological tools and examine long-term streamflow trends, we extended the stream record by 1500 years using linear regression and machine learning reconstruction models informed by the tree-ring-derived self-calibrating Palmer Drought Severity Index (scPDSI). Linear regression models provided skillful reconstruction and stable performance across calibration and validation periods. Random Forest and Deep Learning achieved higher skill but lost some of their skill advantage with validation periods, indicating overfitting. All models captured drought years more reliably than flood years, reflecting the sensitivity of scPDSI to soil moisture but its limitations for high-flow extremes in the Appalachian region. Trend analyses identified a significant change point in 1271 CE, separating a drought-dominated early period (500–1272 CE) from a wetter, less variable regime (1273–1970 CE). An emerging trend shows higher average flow interrupted by severe single-year droughts, consistent with regional evidence and projected changes to hydrologic regimes in Appalachia. These findings provide a millennial perspective on hydrologic extremes and guidance on using paleohydrology tools for water resource planning in a changing climate.","PeriodicalId":23623,"journal":{"name":"Water SA","volume":"17 22","pages":"3288-3288"},"PeriodicalIF":0.0,"publicationDate":"2025-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.mdpi.com/2073-4441/17/22/3288/pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147895201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Spatial and Temporal Distribution and Risk Assessment of Dissolved and Particulate Heavy Metals in the Middle and Lower Reaches of the Yellow River During the Water and Sediment Regulation Period 黄河中下游水沙调整期溶解态和颗粒态重金属时空分布及风险评价

4区环境科学与生态学

Water SA Pub Date : 2025-11-16 DOI: 10.3390/w17223272

Yimei Ying, Xinrui Cui, Xu Wang, Ruijie Huang, Bing Han, Yun Zhang, Jinglei Hou, Meng Shang, Yu Bai

{"title":"Spatial and Temporal Distribution and Risk Assessment of Dissolved and Particulate Heavy Metals in the Middle and Lower Reaches of the Yellow River During the Water and Sediment Regulation Period","authors":"Yimei Ying, Xinrui Cui, Xu Wang, Ruijie Huang, Bing Han, Yun Zhang, Jinglei Hou, Meng Shang, Yu Bai","doi":"10.3390/w17223272","DOIUrl":"https://doi.org/10.3390/w17223272","url":null,"abstract":"Water-sediment regulation Scheme (WSRS) is a crucial artificial control method for water and sediment in the lower reaches of the Yellow River (YR). During this period, the impact of high flow discharge and high sediment concentration on the distribution and transport of heavy metals in the Yellow River warrants particular attention. This study analyzes heavy metals in water and suspended sediments across different phases of the WSRS. During the WSRS, the lower Yellow River showed decreased levels of dissolved heavy metals. Evaluations of the ecological risk posed by Cd, Cu, Ni, Pb, Zn, and Cr in suspended sediments suggested an absence of risk or minimal risk levels. A greater percentage of Cd and Pb was found in bioavailable forms. And RAC analysis further revealed that Cd poses a relatively higher migration risk. Compared to the water regulation stage (WRS), the sediment regulation stage (SRS) was characterized by lower dissolved heavy metal concentrations but higher particulate heavy metal contents. Over 85% of heavy metals were transported by SPM in WSRS. During the sediment regulation phase, the mean particulate transport proportion for heavy metals surpassed 96%. This phase accounted for more than 50% of the total heavy metal flux delivered to the sea throughout the entire regulation period. These findings offer valuable insights into controlling and managing heavy metal risks during WSRS in the YR.","PeriodicalId":23623,"journal":{"name":"Water SA","volume":"17 22","pages":"3272-3272"},"PeriodicalIF":0.0,"publicationDate":"2025-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.mdpi.com/2073-4441/17/22/3272/pdf?version=1763277564","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147896715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

L-Lysine-Modified Lignin for Polishing Alkaline Road-Marking Wash Water: High Uptake of Cationic Dyes with Acid-Enabled Regeneration l -赖氨酸修饰木质素抛光碱性路标洗水：高吸收率酸性再生阳离子染料

4区环境科学与生态学

Water SA Pub Date : 2025-11-12 DOI: 10.3390/w17223234

Zeyu Xiong, Peng Jing

{"title":"L-Lysine-Modified Lignin for Polishing Alkaline Road-Marking Wash Water: High Uptake of Cationic Dyes with Acid-Enabled Regeneration","authors":"Zeyu Xiong, Peng Jing","doi":"10.3390/w17223234","DOIUrl":"https://doi.org/10.3390/w17223234","url":null,"abstract":"Road-marking operations generate alkaline wash water with intense color and soluble cationic additives. A new biomass adsorption material (LML) was developed to address dye pollution in road-marking wash water effectively. Enzymatically hydrolyzed lignin was used as the raw material for the first time. L-lysine was modified to the structure of the lignin benzene ring using a simple one-step synthesis method, which endowed lignin with a large number of active carboxyl and amino functional groups to improve its adsorption capacity. The adsorption performance of LML for methylene blue in water was also investigated. The experimental results show that the LML has a high dye removal rate under alkaline conditions. The fitted adsorption model shows that the saturated adsorption capacity of LML for methylene blue (MB) is 129.4 mg g−1 and malachite green (MG) is 244.9 mg g−1, which is in line with the Langmuir isotherm adsorption model. The adsorption process is endothermic, which means that the adsorption capacity increases with increasing temperature. Kinetic studies showed that the adsorption process reached equilibrium within 120 min following a pseudo-second-order kinetic model. The cycle experiment shows that the removal efficiency of the adsorbent for dyes can still reach 90% after five cycles, indicating a good practical application value for the polishing of road-marking wash water.","PeriodicalId":23623,"journal":{"name":"Water SA","volume":"17 22","pages":"3234-3234"},"PeriodicalIF":0.0,"publicationDate":"2025-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.mdpi.com/2073-4441/17/22/3234/pdf?version=1763001783","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147899651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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