Process Safety and Environmental Protection最新文献_第10页

Uncertainty evaluation associated with removal of molybdenum from industrial effluents as environmental impacts using solvent extraction with LIX 63 用lix63溶剂萃取法去除工业废水中钼作为环境影响的不确定度评价

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection

Pub Date : 2025-02-01 DOI: 10.1016/j.psep.2024.12.005

Benyamin Shakib , Jin-Young Lee , Hee-Nam Kang , Martina Petranikova

The industrial waste streams generated by mixed acid solutions contain concentrated solutions of toxic heavy metals, and improper disposal of these waste streams constitutes a significant factor in environmental problems when the metals are leached into the atmosphere. One approach to enhancing the recovery of critical metals involves using rational modeling and risk analysis to evaluate the processing options and identify the most economically efficient conditions to meet market demand, considering an environmentally friendly approach. Hence, this study sought to scrutinize the uncertainty impact of influential parameters on molybdenum efficiency during extraction and stripping stages from industrial effluent by employing a hybrid model that integrates the adaptive neuro-fuzzy inference system (ANFIS) with the particle swarm optimization (PSO) algorithm. The model was used to predict the operational conditions needed to achieve maximum efficiency while considering the presence of concentrated metal ions. The optimized model predicted that Mo removal from the waste solution could achieve 74.8 % under 20 min duration with the LIX 63 concentration of 24 % and equal O/A ratio at a temperature of 25 °C. Similarly, the mixing time, temperature, NaOH concentration, and A/O ratio for the recovery stage were determined to be optimized at 20 min, 25 °C, 2.0 M, and 0.6, respectively. Uncertainty of the predicted data was analyzed using Monte Carlo Simulation (MCS) and Latin Hypercube Sampling (LHS) for the removal and recovery stages. MCS revealed a 90 % confidence interval for removal (39.76–90.82 %) and recovery (63.06–91.08 %), with sensitivity analysis identifying the phase ratios as the most influential factors in both stages. The sodium molybdate specimen was obtained through crystallization from strip solutions and subsequently characterized using XRD and SEM-EDS analyses.

混合酸溶液产生的工业废液中含有有毒重金属的浓缩溶液，这些废液处理不当会将金属沥滤到大气中，成为造成环境问题的一个重要因素。提高关键金属回收率的方法之一是利用合理的建模和风险分析来评估处理方案，并确定最经济有效的条件，以满足市场需求，同时考虑到环境友好型方法。因此，本研究试图采用一种混合模型，将自适应神经模糊推理系统（ANFIS）与粒子群优化算法（PSO）结合起来，仔细研究在工业废水的萃取和汽提阶段，影响参数对钼效率的不确定性影响。该模型用于预测实现最高效率所需的操作条件，同时考虑到高浓度金属离子的存在。根据优化模型预测，在骊63浓度为24%、O/A比相同、温度为25°C的条件下，废液中钼的去除率在20分钟内可达到74.8%。同样，回收阶段的混合时间、温度、NaOH 浓度和 A/O 比率也分别确定为 20 分钟、25 °C、2.0 M 和 0.6。使用蒙特卡罗模拟（MCS）和拉丁超立方采样（LHS）分析了去除和回收阶段预测数据的不确定性。蒙地卡罗模拟显示，去除率（39.76%-90.82%）和回收率（63.06%-91.08%）的置信区间均为 90%，敏感性分析表明，相位比是两个阶段中影响最大的因素。钼酸钠试样是从带状溶液中结晶得到的，随后利用 XRD 和 SEM-EDS 分析对其进行了表征。

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引用次数: 0

Synthesis of ZIF-derived C-doping Co3O4/ ZnO membranes for enhanced removal of organics by peroxymonosulfate activation under visible-light 可见光下zif衍生的c掺杂Co3O4/ ZnO膜的合成及其对有机物的去除

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection

Pub Date : 2025-02-01 DOI: 10.1016/j.psep.2024.12.084

Liusha Cen , Fan Yu , Shixue Liu , Chengcai Li , Wangyong Jin , Chenliang Wang , Hailin Zhu , Yuhai Guo

The technology that catalyst activated perxymosulfate (PMS) has been widely used in the decomposition of organic pollutants. We prepared Zn and Co-based ZIF and obtained C-doping Co₃O₄/ ZnO heterojunction after pyrolysis. C-doping Co₃O₄/ ZnO heterojunction with cage core-shell structure was loaded on the polyvinylidene fluoride (PVDF) membranes with a layered porous structure by solvent-assisted nanoparticle embedding (SANE) method, where the carmine degradation reached 99.6 % by MC-430 activated Perxymosulfate (PMS) within 10 min. The influencing factors (such as the pyrolysis temperature, PMS dosage, and dye concentration) on OFX degradation were observed, and MC-430 exhibited good tolerance for these factors and a wide range of solution hydrogen ion concentrations (pH= 4–10). The strong reusability and stability analysis showed that the carmine degradation of the MC-430/PMS system changed minorly (from 99.6 % to 97.7 %) in 5 consecutive cycles without any treatment. The degradation mechanism was confirmed by capture experiments, in which the non-free radical path was the main one and the free radical path was the auxiliary one. Moreover, structure characterizations and density functional theory calculations verified that doped C sites provided a channel for electron transfer from Zn sites to Co sites, which increased the generation rate of reactive oxygen species (ROS) and prolonged the catalyst life. This work provides a new method for the preparation of nonmetallic doping bimetallic strong coupling catalysis.

催化剂活化过氧硫酸盐（PMS）技术在有机污染物的分解中得到了广泛的应用。我们制备了Zn和co基的ZIF，并通过热解得到了c掺杂的Co3O4/ ZnO异质结。采用溶剂辅助纳米颗粒包埋（SANE）的方法，将c掺杂的笼型核壳结构的Co3O4/ ZnO异质结负载在层状多孔结构的聚偏氟乙烯（PVDF）膜上，MC-430活化的过氧硫酸盐（PMS）在10 min内对胭脂红的降解率达到99.6 %。观察了热解温度、PMS用量、染料浓度等对OFX降解的影响因素，MC-430对这些因素具有良好的耐受性，且溶液氢离子浓度（pH= 4-10）范围广。强可重用性和稳定性分析表明，MC-430/PMS系统的胭脂红降解在连续5个循环中变化不大（从99.6 %到97.7 %）。捕获实验证实了其降解机理，其中非自由基途径为主要途径，自由基途径为辅助途径。此外，结构表征和密度泛函理论计算证实，掺杂C位为电子从Zn位转移到Co位提供了通道，从而提高了活性氧（ROS）的生成速率，延长了催化剂的寿命。本工作为制备非金属掺杂双金属强偶联催化剂提供了一种新方法。

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引用次数: 0

Mechanistic analysis and environmental impact assessment of ferrate degradation of sulfonamide antibiotics 磺胺类抗生素高铁酸盐降解机理分析及环境影响评价

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection

Pub Date : 2025-02-01 DOI: 10.1016/j.psep.2024.12.082

Weiwei Ren , Zhengming He , Lixia Shi , Jiani Xu , Cong Li , Yunshu Zhang , Ke Dong , Sang-Seob Lee

The widespread use of sulfonamide antibiotics and the absence of efficient treatment methods have led to increasing environmental contamination. This research explores the degradation of sulfamethoxazole (SMX) and sulfamethazine (SMT) in water using potassium ferrate (Fe(VI)) as a green oxidant. Various factors influencing degradation efficiency, including mass ratio, pH, temperature, coexisting ions, and humic acid (HA), were systematically investigated. A higher mass ratio significantly improved removal efficiency, achieving complete degradation of SMX within 40 and 20 min at 15:1 and 20:1 ratios, respectively, and SMT within 35 and 15 min. Acidic conditions (pH 5–7) favored SMT removal, while alkaline conditions (pH 8–9) enhanced SMX degradation. Temperature elevation had a more pronounced effect on SMT removal. NO₂^- initially promoted but subsequently inhibited degradation, whereas HCO₃^- enhanced SMT removal and hindered SMX degradation. Fe³⁺ and Cu²⁺ strongly inhibited the degradation of both pollutants. Mass spectrometry and DFT simulations elucidated oxidation pathways involving ring-opening, hydroxylation, and desulfurization. Fe(VI) treatment markedly reduced the toxicity of both compounds, demonstrating promising results in real water samples. This research provides valuable insights into the application of Fe(VI) for antibiotic degradation, offering a novel approach for the efficient removal of pollutants from water bodies.

磺胺类抗生素的广泛使用和缺乏有效的治疗方法导致环境污染日益严重。本研究以高铁酸钾（Fe(VI)）为绿色氧化剂，探讨了水中磺胺甲恶唑（SMX）和磺胺乙嗪（SMT）的降解。系统考察了质量比、pH、温度、共存离子、腐植酸（HA）等因素对降解效率的影响。较高的质量比显著提高了去除效率，在15:1和20:1的质量比下，SMX在40和20 min内完全降解，SMT在35和15 min内完全降解。酸性条件（pH 5-7）有利于SMT的去除，而碱性条件（pH 8-9）有利于SMX的降解。温度升高对SMT的去除有更明显的影响。NO2-最初促进但随后抑制降解，而HCO3-增强SMT的去除并阻碍SMX的降解。Fe3+和Cu2+对两种污染物的降解均有较强的抑制作用。质谱和DFT模拟阐明了氧化途径包括开环、羟基化和脱硫。铁（VI）处理显著降低了这两种化合物的毒性，在实际水样中显示出令人鼓舞的结果。本研究为Fe（VI）在抗生素降解中的应用提供了有价值的见解，为有效去除水体中的污染物提供了一种新的方法。

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引用次数: 0

Ionic liquid interfacial modification of magnetic metal-organic framework enhances laccase stability and catalytic performance in degrading phenolic pollutants 磁性金属-有机骨架的离子液体界面改性提高了漆酶的稳定性和降解酚类污染物的催化性能

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection

Pub Date : 2025-02-01 DOI: 10.1016/j.psep.2024.12.083

Wei Zhang, Qianru Wang, Jifei Song, Min Zhang, Yi Hu

Laccase is capable of catalyzing a wide range of substrates and is a potential candidate for pollutant biodegradation. However, its application is limited by the free enzyme, poor stability, and difficulties in recycling. In this paper, a novel bio-enzymatic preparation was constructed by using imidazolium-based ionic liquids as surface modifiers to modify magnetic metal-organic frameworks and immobilize laccase by covalent binding. The prepared immobilized enzyme (laccase-ILs-MIL-100-Fe₃O₄) exhibited remarkable thermal stability, retaining 72.7 % activity at 70 ℃, whereas the free laccase experienced almost complete inactivation, whereas the enzyme in the free laccase almost lost its activity. After 6 times of reuse, the laccase-ILs-MIL-100-Fe₃O₄ still retained nearly 60 % of its activity and possessed good reusability. Notably, the immobilized enzyme achieves nearly complete removal of phenolic pollutants within 8 h and maintains over 50 % removal efficiency even at high concentrations after 12 h. More importantly, the immobilized system could be recycled and reused for the treatment of pollutants. The removal efficiency of 74.3 % was maintained after 7 rounds of cycling. This paper presents an effective strategy for the development of novel biologics and provides valuable insights into advancing efficient enzyme immobilization technology and the practical application of immobilized enzymes in wastewater treatment.

漆酶能够催化多种底物，是污染物生物降解的潜在候选物。但其应用受到游离酶、稳定性差、回收困难等问题的限制。本文以咪唑基离子液体为表面改性剂，构建了一种新型的生物酶制剂，通过共价结合修饰磁性金属-有机框架并固定漆酶。所制备的固定化酶（漆酶- il - mil -100- fe3o4）具有良好的热稳定性，在70℃下仍保持72.7 %的活性，而游离漆酶几乎完全失活，而游离漆酶中的酶几乎失去活性。经过6次重复使用，漆酶- il - mil -100- fe3o4仍保持了近60% %的活性，具有良好的可重复使用性。值得注意的是，固定化酶在8 h内几乎完全去除酚类污染物，并且在12 h后即使在高浓度下也保持超过50% %的去除效率。更重要的是，固定化系统可以回收再利用，用于处理污染物。循环7次后，去除率保持在74.3 %。本文提出了开发新型生物制剂的有效策略，为推进高效酶固定化技术和固定化酶在废水处理中的实际应用提供了有价值的见解。

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引用次数: 0

Selective complex leaching of Cu, Zn, and Cd from recycled copper smelting fly ash using NH3-NH4Cl system and kinetic analysis NH3-NH4Cl体系选择性络合浸出铜冶炼粉煤灰中的Cu、Zn、Cd及动力学分析

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection

Pub Date : 2025-02-01 DOI: 10.1016/j.psep.2024.12.074

Fan Lin , Tianya Lei , Jiancheng Shu , Mengjun Chen , Jibamu Duo , Xiangfei Zeng , Yunhui Han , Shaoqin Chen , Jiaming Chen , Weiping Huang , Jun Luo

Direct stacking and storage of recycled copper smelting fly ash (RCA) will not only cause environmental pollution, but also its valuable metal resources (Cu, Zn, Cd, etc.) will be wasted. In this study, Cu, Zn and Cd in RCA were leached by selective complexation using the NH₃-NH₄Cl system. The results showed that the leaching efficiencies of Cu, Zn, and Cd were 89.45 %, 78.75 %, and 82.34 % respectively, when the concentration of NH₃·H₂O was 1 mol/L, the concentration of NH₄Cl was 1 mol/L, the solid liquid ratio was 125 g/L at 30 °C reacting for 60 min. In addition, the combined control of chemical reaction and diffusion of the NH₃-NH₄Cl leaching system limits the leaching efficiency of Cu. The leaching mechanism indicates that Cu, Zn, and Cd in RCA were predominantly intensively leached as complex [Cu(NH₃)₄]²⁺, [Zn(NH₃)₄]²⁺, and [Cd(NH₃)₄]²⁺. A part of Cu₂(OH)₃Cl, CuO, FePO₄·2H₂O, Zn(OH)₂ and ZnCl₂ in RCA converted to (NH₄)₂CuCl₄, [Cu(NH₃)₄](OH)₂ and Zn₃(PO₄)₂, and are accompanied by the formation of FeO(OH) and Fe₂O₃·H₂O in the NH₃-NH₄Cl leaching system. This study provides a database and methodological support for the leaching of Cu, Zn, and Cd from RCA.

回收铜冶炼飞灰（RCA）的直接堆存不仅会造成环境污染，还会浪费其中宝贵的金属资源（Cu、Zn、Cd等）。本研究采用NH3-NH4Cl体系选择性络合浸出RCA中的Cu、Zn和Cd。结果表明，当NH3·H2O浓度为1 mol/L， NH4Cl浓度为1 mol/L，料液比为125 g/L，反应时间为60 min时，Cu、Zn和Cd的浸出效率分别为89.45 %、78.75 %和82.34 %。此外，NH3-NH4Cl浸出体系的化学反应和扩散的联合控制限制了Cu的浸出效率。浸出机理表明，Cu、Zn、Cd在RCA中主要以络合物[Cu(NH3)4]2+、[Zn(NH3)4]2+和[Cd(NH3)4]2+富集浸出。部分Cu2(OH)3Cl、CuO、FePO4·2H2O、Zn(OH)2和ZnCl2在RCA中转化为（NH4）2CuCl4、[Cu(NH3)4](OH)2和Zn3(PO4)2，并在NH3- nh4cl浸出体系中生成FeO（OH）和Fe2O3·H2O。本研究为从RCA中浸出Cu、Zn和Cd提供了数据库和方法支持。

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引用次数: 0

Defective cobalt-nitrogen dual-doped carbon materials for enhanced tetracycline hydrochloride degradation in flow-through electro-Fenton-membrane system 有缺陷的钴氮双掺杂碳材料增强电- fenton膜系统对盐酸四环素的降解

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection

Pub Date : 2025-02-01 DOI: 10.1016/j.psep.2024.12.073

Ruiying Zhu , Hong Ma , Xuan Luo , Li Zhao , Xiaofang Pan , Binfei Yang , Xiaochun Wu , Xiaobo Gong

Tetracycline hydrochloride (TC) is recognized as a newly emerging water pollutant with significant implications for human health and environmental quality. Conventional electro-Fenton (EF) processes often entail high energy consumption due to inherent limitations in mass transfer efficiency. Thus, a flow-through EF-membrane separation reactor was developed to synergistically achieve efficient filtration enrichment and oxidative degradation of TC. A defective-state cobalt-nitrogen double-doped carbon material (Co-NPC) derived from metal-organic materials could in-situ generate and self-decompose H₂O₂ into highly reactive ·OH radicals for TC degradation. The activated membrane (Co-NPC/CNT/PVDF) is obtained by ultrasonically mixing Co-NPC with conductive CNT and filtering it onto a PVDF membrane. Remarkably, EF system with Co-NPC/CNT/PVDF membrane exhibited a remarkable TC degradation efficiency of 98 % within 2 min, with sustained degradation efficiency exceeding 90 % over 40 min. Moreover, the mineralization efficiency remained stable at approximately 55 %, harnessing the combined capabilities of membrane separation, enrichment, and catalytic oxidation for pollutant remediation. Benefitting from its hydrophilicity, specific surface area, pore size, and superior TC removal performance, the Co-NPC/CNT/PVDF membrane demonstrated exceptional self-cleaning properties and robust resistance to external disturbances. This innovative approach presents a promising strategy for the efficient in-situ production of H₂O₂ and degradation of pollutants, offering potential advancements in water treatment technology.

盐酸四环素是一种新兴的水污染物，对人类健康和环境质量具有重要影响。由于传质效率的限制，传统的电fenton （EF）工艺往往需要较高的能量消耗。为此，开发了一种流式膜分离反应器，协同实现高效过滤富集和氧化降解TC。一种源自金属-有机材料的缺陷态钴氮双掺杂碳材料（Co-NPC）可以原位生成并自分解H2O2为高活性的·OH自由基，用于TC降解。通过超声波将Co-NPC与导电碳纳米管混合并过滤到PVDF膜上，得到了Co-NPC/CNT/PVDF活性膜。值得注意的是，含有Co-NPC/CNT/PVDF膜的EF体系在2 min内的降解效率为98 %，在40 min内的持续降解效率超过90 %。此外，矿化效率稳定在约55% %，利用膜分离，富集和催化氧化的综合能力进行污染物修复。得益于其亲水性、比表面积、孔径和优异的TC去除性能，Co-NPC/CNT/PVDF膜表现出优异的自清洁性能和对外部干扰的强大抵抗能力。这种创新的方法为有效地原位生产H2O2和降解污染物提供了一种有前途的策略，为水处理技术提供了潜在的进步。

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引用次数: 0

Agroecosystem contamination with heavy metals due to road transportation: A global threat to safe food security 道路运输造成的农业生态系统重金属污染：对安全粮食保障的全球威胁

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection

Pub Date : 2025-02-01 DOI: 10.1016/j.psep.2024.12.046

Akshay Kumar Singh , Jatin Kumar Choudhary , Sushil Kumar Shukla , Kuldeep Bauddh , Gavendra Pandey , Sughosh Madhav , Ajai Singh , Manoj Kumar

Road transportation significantly contributes to heavy metals (HMs) in the atmosphere. The introduction of HMs into the environment is a major global ecotoxicological concern. The proliferation of road networks, coupled with the escalating vehicular volume, has exacerbated the presence of HMs, including lead (Pb), cadmium (Cd), manganese (Mn), mercury (Hg), copper (Cu), chromium (Cr), in agricultural soil and crops proximate to transportation arteries, thereby imperilling global food security. The current review focused on the significant contamination of HMs in agroecosystems worldwide due to road transportation. It highlights the various pathways through which HMs are transported to agroecosystems and their impact on nearby ecosystems. The review also evaluates the degree of HMs contamination and its subsequent transfer into soil and crops such as geoaccumulation index (Igeo), enrichment factor (EF), translocation factor (TF), and bioaccumulation factor (BAF). Recent studies have shown that harmful HMs can be absorbed by edible parts of crops, which are then consumed directly by humans. A study conducted near the National Highway in Jhansi, India found high levels of HMs in the edible parts of tomato plants (Cu – 4.77 mg/kg, Cd- 0.14 mg/kg, nickel (Ni) – 0.89 mg/kg, and Mn – 14.46). Similar studies conducted in various parts of the world have also observed increased HMs in agricultural soil and crops near roads. The current review aims to investigate HMs contamination in agroecosystems caused by road transportation and to suggest directions for future research to reduce HMs emissions from the sources.

公路运输对大气中的重金属有很大贡献。微生物进入环境是一个主要的全球生态毒理学问题。道路网络的扩散，加上车辆数量的不断增加，加剧了交通要道附近农业土壤和作物中铅（Pb）、镉（Cd）、锰（Mn）、汞（Hg）、铜（Cu）、铬（Cr）等有机污染物的存在，从而危及全球粮食安全。目前的审查重点是由于道路运输对农业生态系统中农药的严重污染。它强调了微生物进入农业生态系统的各种途径及其对附近生态系统的影响。综述还评价了土壤富集指数（Igeo）、富集因子（EF）、转运因子（TF）和生物富集因子（BAF）等土壤和作物对土壤和作物的污染程度及其随后的转移。最近的研究表明，有害的HMs可以被农作物的可食用部分吸收，然后直接被人类食用。在印度Jhansi国道附近进行的一项研究发现，番茄植株可食用部分的HMs含量很高（Cu - 4.77 mg/kg, Cd- 0.14 mg/kg，镍(Ni) - 0.89 mg/kg, Mn - 14.46）。在世界各地进行的类似研究也观察到公路附近的农业土壤和作物的土壤微生物含量增加。本文旨在探讨公路运输对农业生态系统中农药污染的影响，并提出今后减少农药排放的研究方向。

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引用次数: 0

A novel strategy for the efficient purification of quartz ore: Experiments, DFT calculations, and life cycle assessment 石英矿石高效提纯的新策略：实验、DFT计算和生命周期评估

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection

Pub Date : 2025-02-01 DOI: 10.1016/j.psep.2024.12.104

Cong Li , Xuebao Tang , Xingyu Liu , Suqin Li

Quartz ore is a useful raw material for producing high-purity quartz. In this study, high-purity quartz is prepared by superconducting high-gradient magnetic separation (S-HGMS) coupled with fluorine-free acid leaching process. The results indicate that the main impurities in quartz ore are monticellite (Ca (Mg, Fe) SiO₄), grossular ((Ca, Fe) (Al, Zr, Fe) Si₃O₁₂), thadeuite (Mg (Ca, Mn) (Mg, Fe, Mn)₂(PO₄)₂(OH)₂), and berlinite (AlPO₄). The weak magnetic impurities are removed by the S-HGMS process, while the fluorine-free acid leaching technology removes berlinite and inclusion impurities from the quartz ore. The final high-purity quartz sand grade is 99.971 %. In addition, experimental analysis as well as first-principles density functional theory (DFT) calculations are utilized to examine the magnetic properties of mineral components in quartz ore. Life cycle assessment (LCA) is conducted to determine the environmental impact of the high-purity quartz sand preparation process, and the contribution of each raw material to high-purity quartz sand production is analyzed. Overall, this study not only establishes an advanced purification process for efficiently removing impurities from quartz ore, which can serve as a theoretical basis for boosting the industrial applications of quartz ore.

石英矿是生产高纯石英的有用原料。本研究采用超导高梯度磁选（S-HGMS）耦合无氟酸浸工艺制备了高纯石英。结果表明：石英矿石中主要杂质为蒙脱石（Ca (Mg, Fe) SiO4）、粗晶(（Ca, Fe) (Al, Zr, Fe) Si3O12）、白脱石(Mg (Ca, Mn) (Mg, Fe, Mn)2（PO4)2(OH)2）和白脱石（AlPO4）。采用S-HGMS工艺去除弱磁性杂质，采用无氟酸浸工艺去除石英矿石中的铍石和包裹体杂质，最终获得的高纯石英砂品位为99.971 %。此外，利用实验分析和第一性原理密度功能理论（DFT）计算来检验石英砂中矿物组分的磁性。通过生命周期评估（LCA）来确定高纯石英砂制备过程的环境影响，并分析了每种原料对高纯石英砂生产的贡献。综上所述，本研究不仅建立了一种高效去除石英矿中杂质的先进提纯工艺，为推进石英矿的工业应用提供了理论基础。

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引用次数: 0

Mechanistic insights and predictive modeling of silicate dissolution in gold tailings via alkaline hydrothermal treatment 碱水热处理金尾矿中硅酸盐溶解的机理及预测模型

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection

Pub Date : 2025-02-01 DOI: 10.1016/j.psep.2024.12.054

Guangshuo Wei , Jiazheng Zhang , Daokui Yang , Yang Jin , Xujiang Wang , Jingwei Li , Dongjie Pang , Wenlong Wang , Yanpeng Mao

The significant accumulation of gold tailings (GT) presents a substantial environmental challenge, while existing pathways for their high-value utilization remain limited and lack theoretical underpinning. This study provides a comprehensive exploration of the separation and recovery of silicate components from GT via a hydrothermal treatment conducted under alkaline conditions. The effects of key parameters including GT/NaOH ratio, NaOH concentration, hydrothermal temperature, and hydrothermal time on silica extraction efficiency (SEE) and solid phase mineral composition were systematically investigated. The study elucidated the mechanism of silicate dissolution and zeolite formation. Furthermore, the optimal parameters for silicon extraction, determined using response surface methodology, are 4 hours, 202°C, 6.95 mol/L, and 1:3 g/mL, achieving a SEE of 70.619 %. Employing multivariate nonlinear regression, the study established a robust predictive model capable of forecasting SEE under various experimental conditions. The model demonstrated high predictive accuracy with minimal deviation at different parameters. Additionally, the zeolite materials obtained as byproducts of the hydrothermal process exhibited ion adsorption capabilities, with a maximum CEC of 1.475 meq/g. This research provides a critical theoretical foundation for the valorization of GT, highlighting its potential for high-value applications.

金尾矿（GT）的大量积累给环境带来了巨大挑战，而现有的高价值利用途径仍然有限，且缺乏理论依据。本研究全面探讨了在碱性条件下通过水热处理从金尾矿中分离和回收硅酸盐成分的方法。研究系统地探讨了 GT/NaOH 比率、NaOH 浓度、水热温度和水热时间等关键参数对二氧化硅提取效率（SEE）和固相矿物成分的影响。研究阐明了硅酸盐溶解和沸石形成的机理。此外，利用响应面方法确定的最佳硅萃取参数为 4 小时、202°C、6.95 摩尔/升和 1:3 克/毫升，SEE 达到 70.619%。该研究利用多元非线性回归建立了一个稳健的预测模型，能够预测各种实验条件下的 SEE。该模型具有很高的预测准确性，不同参数下的偏差极小。此外，作为水热法副产品获得的沸石材料具有离子吸附能力，最大 CEC 为 1.475 meq/g。这项研究为 GT 的价值评估提供了重要的理论基础，凸显了其在高价值应用方面的潜力。

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引用次数: 0

Degradation of ciprofloxacin in sludge by peroxymonosulfate activated by CoFe2O4: Performance, degradation pathways and mechanism CoFe2O4活化过氧单硫酸盐降解污泥中环丙沙星的性能、降解途径及机理

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection

Pub Date : 2025-02-01 DOI: 10.1016/j.psep.2024.12.032

Qiyao Liu , Wenjiao Sang , Xinyang Xu , Min Li , Lei Zou , Fangmao Gan

Ciprofloxacin (CIP) is a bio-refractory contaminant in waste activated sludge. This study successfully fabricated CoFe₂O₄ magnetic nanoparticles (CoFe₂O₄ MNPs) as peroxymonosulfate (PMS) activators for CIP degradation. The effects of experimental parameters (PMS and catalyst dosage, pH, and initial CIP concentration) on degradation were thoroughly examined. Results showed that under optimal conditions, 88.3 % of CIP was degraded by CoFe₂O₄ MNPs activating PMS. Radical quenching experiments identified SO₄·^-, ·OH, and ·O₂^- as the key radicals in CIP degradation. Crucially, CIP degradation in the sludge system was closely associated with sludge floc disruption and cell lysis, leading to CIP release from the solid to the liquid phase—a process distinct from degradation in the liquid phase alone. Thermodynamic analysis confirmed that the enhanced hydrophilicity of sludge promoted this release. The study also deduced CIP degradation pathways and evaluated the toxicity of intermediates. CoFe₂O₄ MNPs demonstrated stability and reusability, efficiently degrading CIP over four cycles with minimal Co and Fe ion leaching. These findings support the potential application of the CoFe₂O₄/PMS system for degrading other antibiotics in excess sludge.

环丙沙星（CIP）是废物活性污泥中的一种生物难降解污染物。本研究成功制备了 CoFe2O4 磁性纳米粒子（CoFe2O4 MNPs）作为过一硫酸盐（PMS）活化剂，用于降解 CIP。实验参数（PMS 和催化剂用量、pH 值和 CIP 初始浓度）对降解的影响进行了深入研究。结果表明，在最佳条件下，CoFe2O4 MNPs 活化 PMS 降解了 88.3% 的 CIP。自由基淬灭实验确定 SO4--、-OH 和 -O2- 是 CIP 降解的关键自由基。最重要的是，污泥系统中的 CIP 降解与污泥絮凝物的破坏和细胞裂解密切相关，从而导致 CIP 从固相释放到液相--这一过程不同于单纯的液相降解。热力学分析证实，污泥亲水性的增强促进了这种释放。研究还推断出了 CIP 降解途径，并评估了中间产物的毒性。CoFe2O4 MNPs 表现出了稳定性和可重复使用性，在四个循环中有效降解了 CIP，且钴和铁离子浸出极少。这些发现支持 CoFe2O4/PMS 系统在降解过量污泥中其他抗生素方面的潜在应用。

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引用次数: 0