Separation and Purification Technology最新文献

{"title":"Vapor-liquid equilibrium and process simulation of aromatic hydrocarbon extraction using N-Formylmorpholine","authors":"Yingzhe Yu ,&nbsp;Guowen Cai ,&nbsp;Jiamei Shi ,&nbsp;Minhua Zhang","doi":"10.1016/j.seppur.2026.137233","DOIUrl":"10.1016/j.seppur.2026.137233","url":null,"abstract":"<div><div>Catalytic reforming is a pivotal process in the petrochemical industry for producing high-octane gasoline and aromatic hydrocarbons, with its products yielding core products such as high-purity n-hexane and benzene after separation. However, due to the extremely close boiling points of the products, efficient separation is difficult to achieve through conventional distillation processes, necessitating the use of extractive distillation for separation. In this study, a multi-scale simulation approach combining quantum calculations, Gibbs Ensemble Monte Carlo (GEMC) simulations, and process simulations was employed to design and develop an efficient extractive distillation process for separating benzene and n-hexane using N-formylmorpholine (NFM) as the extractant. Quantum calculations were utilized to obtain a complete molecular force field for NFM, which was then used in GEMC simulations to generate phase equilibrium data. These data were fitted to derive binary interaction parameters, thereby facilitating the development of the extractive distillation process. The existing NFM molecular force field suffered from incomplete parameters; thus, quantum calculations were used to supplement missing parameters and optimize van der Waals parameters, resulting in a reconstructed and optimized NFM molecular force field. The isothermal vapor-liquid equilibrium (VLE) data for the NFM/n-hexane binary system obtained through simulations using this new force field showed significantly improved agreement with experimental data, solidifying the foundation for process simulation. Based on the optimized force field, further simulations were conducted to obtain atmospheric VLE data for three critical binary systems: NFM/n-hexane, NFM/2,4-dimethylpentane, and NFM/benzene. Accurate binary interaction parameters were derived by fitting these data using the NRTL-RK equation. Leveraging the aforementioned foundational data, an NFM-based extractive separation process was constructed, ultimately achieving efficient purification of the target products, yielding high-purity benzene and cyclohexane products. This significantly enhanced the separation efficiency and product value-added of catalytic reforming products, providing a practical solution for the efficient separation of catalytic reforming products.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137233"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Boosted H2O2 activation to dissociated hydroxyl radical by regulating B sites in copper-based delafossite for contaminants degradation: Key role on adsorption configuration and occurrence forms","authors":"Jiang Li ,&nbsp;Haoran Zhang ,&nbsp;Sihao Fu ,&nbsp;Yunfei Wang ,&nbsp;Kun Liu ,&nbsp;Yujiao Liu ,&nbsp;Tianjie Su ,&nbsp;Lingyu Meng ,&nbsp;Guocheng Liu ,&nbsp;Qinghua Yan ,&nbsp;Chengzhi Zhou ,&nbsp;Yanjun Xin ,&nbsp;Shuaishuai Xin","doi":"10.1016/j.seppur.2026.137120","DOIUrl":"10.1016/j.seppur.2026.137120","url":null,"abstract":"<div><div>Regulating the activation of hydrogen peroxide (H₂O₂) through constructing efficient metal catalysts is extensively utilized in various oxidation reaction processes. However, the exploration of the intrinsic mechanism for enhancing the effective activation of H₂O₂ at metal sites still faces challenges. Herein, the adsorption configuration and occurrence forms of H₂O₂ on B site in copper-based delafossite (CuBO₂, B<img>Mn, Fe and Co) were demonstrated to be the core factor affecting H₂O₂ activation to generate specific radical for doxycycline hydrochloride (DOH) degradation. The phytotoxicity and antimicrobial activity of DOH was significantly reduced by H₂O₂ activated on Mn sites compared with Fe and Co sites. The Mn sites facilitated charge transfer between the copper-based delafossite and H₂O₂, and overcame the lower energy barrier (0.233 eV) of H₂O₂ to transition state than Fe site (0.421 eV) and Co site (0.418 eV). The longest bond length of O<img>O and the shortest bond length of O<img>H in H₂O₂ adsorbed on Mn sites promoted H₂O₂ activation to ^•OH, whereas H₂O₂ adsorbed on Fe site and Co site were more easily decomposed into HO₂^•/^•O₂⁻ radicals or O₂ by breaking O<img>H bonds. The excessively weak binding force of Mn site promoted diffusion of ^•OH into solution for dissociated ^•OH generation, which was also confirmed by the results of experimental tests. The developed flow activated H₂O₂ device with CuMnO₂ in-situ grown on copper foam (CuMnO₂/Cu foam) as catalyst showed superior treatment performance of various refractory organic contaminants and anti-interference ability. The successful trial operation of flow activated H₂O₂ device paves the way for promoting water purification and solving the problem of catalyst separation in purified water.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137120"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tailoring NiFe2O4 nanoparticles via electron-rich Co centers and abundant redox pairs: boosting peroxymonosulfate activation for micropollutant degradation","authors":"Bao Pan ,&nbsp;Jiahao Zhang ,&nbsp;Ruobai Li ,&nbsp;Yanle Zhou ,&nbsp;Jiani Qin ,&nbsp;Rong Xu ,&nbsp;Chuanyi Wang","doi":"10.1016/j.seppur.2026.136859","DOIUrl":"10.1016/j.seppur.2026.136859","url":null,"abstract":"<div><div>The pervasive presence of pharmaceutical and personal care products (PPCPs) in water bodies underscores the urgency for the advancement of efficient and sustainable methods for their removal. Peroxymonosulfate (PMS)-based advanced oxidation processes (AOPs) have demonstrated significant potential in water purification, with their effectiveness largely hinging on the development of high-performance catalysts. In this study, cobalt-doped nickel ferrite (Co-NFO) nanocatalysts were synthesized using a sol-gel combined with calcination method to enhance PMS activation for the degradation of micropollutants. Characterization results confirmed the successful incorporation of Co into the spinel lattice of NFO, which improved phase purity and electronic properties without significantly affecting textural features. The optimized 2.5%Co-NFO catalyst demonstrated exceptional performance in the degradation of carbamazepine (CBZ), achieving a 92.7% degradation efficiency within 15 min, significantly outperforming the undoped NFO catalyst. The system demonstrated broad applicability across various micropollutants and maintained excellent stability and reusability over multiple reaction cycles. In-depth mechanistic studies, incorporating radical quenching experiments, electron paramagnetic resonance (EPR) analysis, electrochemical measurements, and density functional theory (DFT) calculations, have elucidated that the degradation process is driven by a multitude of reactive species. The enhanced catalytic activity was attributed to the improved electron transfer efficiency and stronger PMS adsorption at Co-active sites. Potential CBZ degradation pathways were proposed, and toxicity assessment indicated a general reduction in the acute toxicity of the generated intermediates. This study introduces an innovative Co-doped magnetic catalyst, which, through the doping process, significantly enhances its catalytic activity for PMS activation, thereby offering a promising solution for efficient water purification.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 136859"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145961868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interpretable machine learning reveals the mechanistic pathways of CO2 capture with zeolite@MOF Core–Shell composites","authors":"Fatemeh Bahmanzadegan,&nbsp;Ahad Ghaemi","doi":"10.1016/j.seppur.2026.137191","DOIUrl":"10.1016/j.seppur.2026.137191","url":null,"abstract":"<div><div>This study establishes a comprehensive data-driven framework to elucidate the adsorption behavior of Zeolite@MOF core–shell under diverse physicochemical conditions. The dataset covered Si/Al ratios from 1 to 30, temperatures from 273 to 338 K, pressures from 0 to 1000 kPa, BET surface areas from 211 to 1504 m² g⁻¹, pore volumes from 0.07 to 0.77 cm³ g⁻¹, and thermal mass losses from 3 to 23%. Response surface methodology (RSM), multiple machine-learning models, including multilayer perceptron (MLP), radial basis function (RBF), support vector machine (SVM), and XGBoost, were systematically optimized using leakage-free validation strategies. The reduced quadratic RSM model achieved strong predictive performance, with an R² of 0.9842 and an RMSE of 0.2209 mmol g⁻¹. Among the data-driven models, the MLP achieved high accuracy (R² = 0.9926, MSE = 0.0002), whereas the RBF network provided excellent nonlinear fitting (R² = 0.9918, MSE = 0.0018). The Bayesian-optimized SVM yielded robust predictions (R² of 0.9705, Pearson r of 0.9851). Notably, XGBoost, evaluated using nested repeated cross-validation (5 × 5 outer, 5 × 2 inner), achieved the most reliable generalization, with an average R² of 0.988 ± 0.012 and an RMSE of 0.186 ± 0.021. Interpretability was achieved through SHAP analysis of the optimized XGBoost model, which quantitatively shows that material-related descriptors account for approximately 63.6% of the model-explained CO₂ adsorption performance, whereas operational variables account for 36.4%. From a materials-design perspective, zeolite cores with low-to-moderate Si/Al ratios combined with MOF shells incorporating intermediate-mass metals such as Zn or Cu emerge as particularly promising configurations. Therefore, this study demonstrates how interpretable machine learning can transform heterogeneous experimental data into quantitative design rules, providing a practical and predictive foundation for the rational synthesis of next-generation zeolite@MOF core–shell adsorbents for efficient CO₂ capture.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137191"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Zr and F co-modified Li2TiO3 with obviously enhanced Li+ adsorption performances","authors":"Jinjing Du ,&nbsp;Jiayi Ma ,&nbsp;Xinxin Cui ,&nbsp;Xun Liu ,&nbsp;Dongbo Wang ,&nbsp;Bin Wang ,&nbsp;Xuan Zhang ,&nbsp;Ruitong Zhai ,&nbsp;Jun Zhu ,&nbsp;Heng Zuo ,&nbsp;Qian Li ,&nbsp;Xihong He","doi":"10.1016/j.seppur.2026.137043","DOIUrl":"10.1016/j.seppur.2026.137043","url":null,"abstract":"<div><div>Layered titanium lithium ion-sieve (H₂TiO₃, HTO) is considered among the most promising adsorbents in liquid lithium extraction technology because of its environmental friendliness, low cost and high H/Ti ratio. In this work, the precursor of Li₂TiO₃ (LTO) was synthesized by co-doping Zr and F with a high-temperature solid phase method through density functional theory (DFT) calculations and corresponding experiments, and then the doped ion sieve (Zr/F-HTO) is obtained by elution with H₂SO₄. The specific surface area of Zr/F-HTO is up to 131.64 m²/g, and the adsorption capacity is 68.66 mg/g. The adsorption behavior of Zr/F-HTO on Li⁺ is consistent with the Langmuir adsorption thermodynamic model and pseudo-second-order kinetic model. In addition, batch experiments revealed that Zr/F-HTO exhibits good lithium selectivity in simulated submerged lithium mother liquor, and the capacity retention rate is as high as 97.7% after five “adsorption-desorption” cycles. The simple economic calculation shows that the adsorbent has good industrial application potential. Therefore, the proposed Zr/F-HTO provides an economical and effective scheme for the efficient extraction of lithium from submerged lithium mother liquor.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137043"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Glycerol-regulated blend membranes of polyether sulfone (PES) and sulfonated polyether sulfone (SPES) for the separation of dye and salt","authors":"Yutong Qin ,&nbsp;Yingbo Chen ,&nbsp;Yongyan Wu ,&nbsp;Haowei Bai ,&nbsp;Yongxiang Shi","doi":"10.1016/j.seppur.2026.137168","DOIUrl":"10.1016/j.seppur.2026.137168","url":null,"abstract":"<div><div>Currently, in the field of dye wastewater treatment, loose nanofiltration membranes generally suffer from low flux and are prone to fouling. Moreover, compared to ultrafiltration membranes, they exhibit a certain retention rate for salts, which is not conducive to the efficient separation of dyes and salts. Therefore, there is an urgent need to develop membranes with high flux and high efficiency in separating dyes from salts. In this study, a phase-inversion-engineered blend membrane comprising polyether sulfone (PES) and sulfonated polyether sulfone (SPES) is reported, which forms a hydrophilic surface layer and compositionally graded substructure. Glycerol was used to modify the membrane, acting as both a lubricant and pore size regulator. By forming hydrogen bonds (intermolecular forces) with the polymer, it improved film formation properties and pore structure, enhanced hydrophilicity, and further increased water flux. Scanning electron microscopy, surface zeta potential, and fully automatic water contact angle test were used to characterize the surface and cross-sectional morphology, surface electronegativity, and hydrophilic of the loose nanofiltration membrane. The pure water flux of the membrane with a solid content of 35% and glycerol addition of 0.1 wt% increase from the original 65.31 L m⁻²·h⁻¹·bar⁻¹ to 104.16 L m⁻²·h⁻¹·bar⁻¹. It achieves near-complete rejection (&gt;96%) of multiple dyes including Congo red, Acid Blue 83, Coomassie Brilliant Blue G-250, and Rose Bengal, while maintaining ultralow salt rejection (Na₂SO₄: 16.86%; NaCl: 2.86%; MgSO₄: 2.42%; MgCl₂: 0.26%)—indicating effective size and charge-based selectivity. This work establishes a simple yet effective glycerol-mediated strategy for fabricating high-flux blend membranes with precise molecular discrimination, offering great potential for dye desalination and resource recovery in textile effluent treatment.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137168"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Process design for recovering rare-earth elements from mine tailings with low rare-earth concentrations via sequential leaching and solvent extraction","authors":"Dong A. Kang,&nbsp;Blake Trusty,&nbsp;Shailesh Dangwal,&nbsp;Benjamin T. Manard,&nbsp;Jordan S. Stanberry,&nbsp;Mariappan Parans Paranthaman,&nbsp;Ramesh R. Bhave,&nbsp;Syed Z. Islam","doi":"10.1016/j.seppur.2026.137161","DOIUrl":"10.1016/j.seppur.2026.137161","url":null,"abstract":"<div><div>Rare earth elements (REEs) are essential for advanced technologies and yet face significant supply chain risks due to their concentrated global production and limited domestic availability. Addressing this challenge requires efficient processes capable of upgrading low-grade secondary resources such as mine tailings. In this study, we developed a novel separation flowsheet that integrates sequential leaching and 2-stage solvent extraction (SX) processes to recover high-purity heavy REEs (HREEs) and light REEs (LREEs) from a simulated mine-tailing concentrate containing 2.4 wt% total REEs (TREEs; 0.6 wt% LREEs and 1.8 wt% HREEs). Sequential leaching with controlled pH adjustment selectively precipitated REEs while retaining the large amount of impurities in the solution, producing an REE-enriched leachate by following leaching processes with roughly twice the REE concentration and half the impurity concentration compared to that of single-step leaching. The optimized SX flowsheet employed Cyanex 572 to extract HREEs and Fe over LREEs, followed by Fe removal using tributyl phosphate (TBP), while the raffinate stream was processed by SX with di(2-ethylhexyl)phosphoric acid (D2EHPA) to recover LREEs under optimized conditions balancing both extraction efficiency and purity. Although increased extractant availability in the organic phase improved LREE recovery, it also increased co-extraction of Ca, underscoring trade-offs in process optimization. Both HREE- and LREE-rich solutions were subsequently precipitated into solid products via oxalate precipitation, resulting in high-purity REE solids containing ∼92.0 wt% HREEs (∼95.7 wt% TREEs) and ∼92.8 wt% LREEs (∼94.0 wt% TREEs). This proof-of-concept study using simulated mine tailings demonstrates a promising approach for upgrading low-grade REE resources, while highlighting the need for future validation with real materials.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137161"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146116138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surface engineering of aluminum-coated açaí biochar via magnetron sputtering for high clorazepate and diclofenac adsorption","authors":"Ronaldo Antunes Funari Junior ,&nbsp;Sabrina Frantz Lütke ,&nbsp;Jonder Morais ,&nbsp;Maria do Carmo Martins Alves ,&nbsp;Marcos Leandro Silva Oliveira ,&nbsp;Eduardo Nuno Borges Pereira ,&nbsp;Lucas Antônio Fantinel ,&nbsp;Lucas David Biondo ,&nbsp;Marcelo Godinho ,&nbsp;Cesar Aguzzoli ,&nbsp;Guilherme Luiz Dotto","doi":"10.1016/j.seppur.2026.137156","DOIUrl":"10.1016/j.seppur.2026.137156","url":null,"abstract":"<div><div>This study evaluates the surface modification of açaí biochar (<em>Al@BC</em>) by aluminum coating via magnetron sputtering, aiming to improve its adsorption performance of clorazepate (CZ) and diclofenac (DC) from aqueous solutions. Sputtering power conditions of 100 W, 150 W, and 200 W were applied, obtaining, respectively, 0.22%, 0.40%, and 3.41% of Al-covering for the adsorbents named <em>Al@100 W</em>, <em>Al@150 W</em>, and <em>Al@200 W</em>. Kinetic analyses fitted to the pseudo-first-order model showed excellent agreement with the experimental data, with better predictive accuracy, particularly for DC. Adsorption equilibrium was achieved at 120 min for CZ and 60 min for DC. Equilibrium isotherms exhibited L2-type profile, suggesting strong adsorbate–adsorbent affinity. The Sips model best described the equilibrium data, evidencing a heterogeneous adsorption process promoted by aluminum deposition. Decreasing Sips (<span><math><mi>m</mi></math></span>) parameters with increasing sputtering power reflected enhanced surface heterogeneity and adsorption favorability. The maximum adsorption capacities reached were 260.7 mg g⁻¹ for CZ and 277.5 mg g⁻¹ for DC onto <em>Al@200 W</em>, representing an improvement of about 35% compared to raw biochar. Regeneration tests showed excellent reusability through the first five cycles; thereafter, coating deterioration greatly diminished the material's efficacy. Finally, magnetron sputtering proved to be an effective strategy, confirming that adsorption efficiency was governed by both aluminum loading and surface chemical modification, thereby enhancing adsorption capacity, affinity, and durability toward pharmaceutical contaminants.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137156"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research and development of eco-friendly high-temperature and salt-resistant filtrate reducers for minimizing drilling fluid loss and environmental pollution","authors":"You Guo ,&nbsp;Yinbo He ,&nbsp;Mingliang Du ,&nbsp;Guancheng Jiang ,&nbsp;Qingchen Wang ,&nbsp;Qin Zhang","doi":"10.1016/j.seppur.2026.137209","DOIUrl":"10.1016/j.seppur.2026.137209","url":null,"abstract":"<div><div>Filtrate reducers are essential drilling-fluid additives that mitigate formation damage from fluid invasion. With the depletion of shallow resources, drilling-fluid applications are increasingly directed toward deep reservoirs that present harsh high-temperature and high-salinity conditions. Conventional high-temperature and salt-resistant filtrate reducers often generate persistent, poorly degradable residues after prolonged heating, whereas eco-friendly alternatives are more degradable but generally lack sufficient thermal and salt tolerance. In this study, an eco-friendly filtrate reducer (AAPT), synthesized from multiple functional monomers, was prepared and systematically evaluated. Environmental assessment indicates that AAPT is non-toxic and biodegradable (EC50 = 200,000 mg/L; BOD5/CODCr = 0.41). Its molecular weight decreases to 987.98 Da after 72 h at 200 °C, with degradation products readily assimilated by plants (wheat germination rate = 90.5% etc., comparable to low-viscosity polyanionic cellulose, PAC<img>Lv). Performance tests demonstrate that AAPT maintains stable filtration control for more than four days at 200 °C; after 96 h, the high-temperature high-pressure (HTHP) fluid loss remains as low as 27 mL, more than 86% lower than PAC-Lv and carboxymethyl starch (CMS). In addition, AAPT remains effective under a salinity level of 15%. Mechanistic studies suggest that its crosslinked structure improves thermal stability, while multipoint adsorption and amphoteric polyelectrolyte effects enhance bentonite hydration, dispersion, and salt resistance, thereby facilitating the formation of a dense, smooth mud cake that minimizes filtrate drain away. Finally, AAPT integrates fluid-loss control under extreme conditions with environmental compatibility, offering a promising strategy for next-generation sustainable drilling-fluid additives in deep and ultra-deep energy exploration.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137209"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"FeCl3/KOH-modified digestate biochar for ciprofloxacin removal: Fe-O coordination-promoted adsorption mechanism and sustainability assessment","authors":"Zihao Wei ,&nbsp;Qian Wu ,&nbsp;Shiyu Fang ,&nbsp;Xiang Zou ,&nbsp;Ran Yu ,&nbsp;Jiashun Cao ,&nbsp;Lianghu Su ,&nbsp;Weijing Liu ,&nbsp;Song Cheng ,&nbsp;Jingyang Luo","doi":"10.1016/j.seppur.2026.137177","DOIUrl":"10.1016/j.seppur.2026.137177","url":null,"abstract":"<div><div>Digestate-derived biochar (BC) and an FeCl₃/KOH-modified biochar (FKBC) were evaluated for ciprofloxacin (CIP) removal from nutrient-rich wastewater. FeCl₃/KOH modification increased the specific surface area from 76.3 to 176.1 m²/g and introduced abundant oxygen-containing functional groups with dispersed Fe<img>O coordination sites. Consequently, FKBC exhibited a Langmuir adsorption capacity of 117.93 mg/g, representing a 91.1% enhancement over pristine BC. Adsorption kinetics of FKBC were well described by the pseudo-second-order model (R² ≈ 0.99), with higher rate constants and initial adsorption rates, indicating accelerated chemisorption. FKBC further enabled simultaneous removal of ammonium and phosphate (∼60% at 20–120 mg/L). Adsorption was pH-dependent, favoring acidic conditions. XPS/FTIR analyses combined with density functional theory (DFT) calculations revealed that CIP adsorption is primarily governed by inner-sphere Fe<img>O coordination and carboxylate complexation, with carbonyl anchoring and π-π interactions contributing at higher surface coverage. Stable Fe 2p features before and after adsorption indicate reversible surface coordination without alteration of iron chemical states, supporting low iron-leaching risk. A ranking efficiency product (REP) analysis yielded an overall sustainability score of 85%, highlighting FKBC as an efficient and sustainable adsorbent for antibiotic remediation and resource-oriented digestate valorization.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137177"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146153690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}