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矿业科学学报 2021年第1期6卷 109-114页

作者：彭思伟何绪文刘海洋白玉勇谷小兵李叶红大唐环境产业集团股份有限公司北京100097 中国矿业大学(北京)化学与环境工程学院北京100083

苯、甲苯、乙苯、二甲苯(BTEX)是煤化工废水中的典型有机污染物,通常情况下较难被生物降解,实际生产过程中通常使用化学手段对其进行去除。本研究以臭氧氧化过程中产生的强氧化性自由基为基础,采用臭氧氧化技术对模拟废水中的BTEX进行... 详细信息

苯、甲苯、乙苯、二甲苯(BTEX)是煤化工废水中的典型有机污染物,通常情况下较难被生物降解,实际生产过程中通常使用化学手段对其进行去除。本研究以臭氧氧化过程中产生的强氧化性自由基为基础,采用臭氧氧化技术对模拟废水中的BTEX进行去除实验。探究了pH值、温度、臭氧投加量以及臭氧投加模式对BTEX降解效果的影响;使用叔丁醇作为羟基自由基抑制剂、自由基歧化酶作为超氧自由基抑制剂,探究臭氧降解BTEX时的反应机理。实验结果表明:当pH值为8、反应温度为30℃、臭氧投加量为3.5 g/L、臭氧投加模式为逆流投加时,BTEX的降解效果最佳;羟基自由基和超氧自由基的存在是臭氧有效去除水中BTEX的根本原因。

关键词：臭氧氧化苯系物自由基抑制剂反应机理

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壳聚糖及其衍生物对土壤重金属的稳定化效应

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化工进展 2019年第9期38卷 4308-4319页

作者：宋俊颖何绪文黄占斌中国矿业大学(北京)化学与环境工程学院

随着工业的发展,特别是采矿冶炼等行业的发展,使含重金属的废弃物进入土壤,造成土壤重金属污染,对环境和人体健康产生极大威胁。本文以湖南怀化某铅锌矿渣堆放地周围污染土壤为研究目标,通过壳聚糖及其衍生物对污染土壤中重金属离子的... 详细信息

随着工业的发展,特别是采矿冶炼等行业的发展,使含重金属的废弃物进入土壤,造成土壤重金属污染,对环境和人体健康产生极大威胁。本文以湖南怀化某铅锌矿渣堆放地周围污染土壤为研究目标,通过壳聚糖及其衍生物对污染土壤中重金属离子的稳定化实验,筛选出对目标重金属(Cd^2+、Pb^2+、Zn^2+)具有最佳稳定效果的稳定剂,探究了稳定剂对土壤中重金属离子的稳定机理,并在模拟酸雨淋溶条件下研究了最佳稳定剂对重金属离子的长期稳定化效果。稳定化实验结果表明,壳聚糖及其衍生物对土壤重金属离子均有稳定化作用,其中羧甲基壳聚糖的稳定效果最好,其使污染土壤中重金属离子的可迁移性及生物有效性明显降低。通过重金属形态分析、扫描电镜(SEM)及X射线衍射(XRD)分析得出稳定剂与土壤中重金属离子发生反应生成络合物,并通过机理分析进一步验证了羧甲基壳聚糖的稳定效果最好;淋溶实验表明,羧甲基壳聚糖对土壤中重金属离子具有长期稳定性,经其稳定后土壤中重金属离子以更稳定不易迁移的形态存在,且使土壤环境得到改善,增强了土壤本身对重金属离子的稳定。羧甲基壳聚糖有望成为修复重金属(Cd^2+、Pb^2+、Zn^2+)污染土壤的优良稳定剂。

关键词：土壤重金属壳聚糖及其衍生物固定化淋溶污染修复

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Unveiling the relationship between dislocation structure evolution and strain hardening behavior of S32654 super-austenitic stainless steel

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JOURNAL OF MATERIALS SCIENCE 2024年第27期59卷 12715-12731页

作者： Liao, Luhai Zhang, he Hu, Shengbo Guo, Rui Yuan, xuwen Li, Fengguang Hubei Univ Automot Technol Sch Mat Sci & Engn Shiyan 442002 Peoples R China Wuhan Univ Sci & Technol Key Lab Ferrous Met & Resources Utilizat Minist Educ Wuhan 430081 Peoples R China Wuhan Univ Sci & Technol Hubei Prov Key Lab New Proc Ironmaking & Steel Mak Wuhan 430081 Peoples R China

Understanding the relationship between dislocation structure evolution and strain hardening behavior is crucial for the development of high-strength and high-ductility alloys. In this work, the strain hardening mechanism of S32654 super-austenitic stainless steel is studied by electron backscatter diffraction and transmission electron microscopy. S32654 is characterized by a constant high strain hardening rate accompanied by 835 +/- 10 MPa ultimate tensile strength and 67 +/- 3% elongation. Deformation microstructures at different strain levels are investigated in order to unveil the influence of microstructure on mechanical properties. Research results indicate that although the strain hardening curve of S32654 shows similarities to high-strength twinning-induced plasticity (TWIP) steels, deformation-induced twinning is not the primary strain hardening mechanism for S32654. With increasing deformation, the evolution of dislocation structures in S32654 is mainly dominated by the continuous refinement of slip bands. The spacing between slip bands, as a microstructural parameter, can describe the flow stress curve. The TWIP effect only contributes to the strain hardening of S32654 in the later stages of deformation.

关键词： Strain hardening

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Numerical and experimental investigation of the effect of cold extrusion process on residual stress and fatigue life of internal thread of high-strength steel

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INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2023年第9-10期127卷 4713-4726页

作者： Wan, Nian he, Qiang Jing, xuwen Jiang, Yonggang Zhou, Honggen Jiangsu Univ Sci & Technol Sch Mech Engn Zhenjiang 212000 Peoples R China Cssc Huangpu Wenchong Shipbuilding Co Ltd Guangdong Prov Key Lab Adv Welding Technol Ships Guangzhou 510715 Peoples R China

In order to improve the fatigue performance of the internal thread of the connecting rod for marine diesel engine, the internal thread cold extrusion technology is introduced into the bolt hole position. Based on the three-dimensional finite element model, the residual stress distribution around the cold extrusion internal thread of 42CrMo4 high-strength steel plate hole structure under different edge distance ratios is analyzed in detail. The multiaxial fatigue life prediction model of thread is established based on the stress-strain method;the accuracy and feasibility of the prediction model are further verified by fatigue experiments. The thread surfaces are examined by utilizing the scanning electron microscope and coordinate with the X-ray diffraction method to measure the residual stress of thread. The relationship between the residual stress distribution, surface structure, and fatigue life of the extrusion thread is revealed. The research shows that the improved fatigue prediction model gives a satisfactory accuracy in predicting the fatigue life. Both the tangential residual stress fields around the extrusion thread and the surface structure have a certain influence on its fatigue life, especially when the edge distance ratio is less than 2. The tangential residual compressive stress of the cold extrusion internal thread decreases with the edge distance ratio being smaller, while the depth of the stress zone increases firstly and then decreases. Higher load will greatly reduce the fatigue life and dispersion of the thread;the fatigue life increases linearly with the increase of the edge distance ratio under lower stress level.

关键词： Cold extrusion thread Edge distance ratio Finite element simulation Fatigue life High-strength steel

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Case study on the combined use of surface seawater injection and depressurization for sustainable natural gas hydrate extraction

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JOURNAL OF CLEANER PRODUCTION 2025年 494卷

作者： Zhang, Zhaobin Li, Yuxuan Li, Shouding he, Jianming Li, Xiao Lu, Cheng Qin, xuwen Chinese Acad Sci Inst Geol & Geophys Key Lab Deep Petr Intelligent Explorat & Dev Beijing 100029 Peoples R China Univ Chinese Acad Sci Coll Earth & Planetary Sci Beijing 100049 Peoples R China China Geol Survey Minist Nat Resources Beijing 100037 Peoples R China

In response to the issue of inefficient extraction of natural gas hydrates due to a lack of heat supplementation during long-term production, a combined extraction method integrating surface seawater injection and depressurization has been proposed. Under the premise that the surface seawater injection pipeline possesses certain thermal insulation properties, this method can sustainably harness solar energy to replenish the thermal energy of gas hydrate reservoirs. Numerical simulations based on a validated three-dimensional heterogeneous model from the 2013 Nankai Trough pilot production in Japan demonstrate that this method significantly enhances hydrate extraction efficiency compared to depressurization alone. The results show that, over a 500-day production scenario, methane recovery efficiency can be enhanced by up to 150%. The study reveals that only an appropriate injection temperature can effectively improve the efficiency of hydrate exploitation. Compared to the depressurization-only method, this extraction approach increases the temperature driving force (TDF) near the injection well improved by up to 12 K. However, higher injection rates suppress depressurization effects, requiring a balance between injection temperature and rate. The proposed approach also facilitates more uniform reservoir deformation, reducing localized subsidence risks. These findings suggest that the combined surface seawater injection and depressurization method provides an effective and environmentally friendly solution for sustainable hydrate exploitation.

关键词： Natural gas hydrate Surface seawater injection Injection temperature and rate Temperature driving force Reservoir deformation

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Synthesis of Cd_xZn_1-xS@Fe₃S₄ magnetic photocatalyst nanoparticles for the photodegradation of methylene blue

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JOURNAL OF ALLOYS AND COMPOUNDS 2018年 735卷 1955-1961页

作者： Yang, Shipeng Zhang, Chunhui Cai, Yaqi he, xuwen Niu, Hongyun China Univ Min & Technol Sch Chem & Environm Engn 11 Xueyuan Rd Beijing 100083 Peoples R China Chinese Acad Sci Res Ctr Ecoenvironm Sci 18 Shuangqing Rd Beijing 100085 Peoples R China

In this study, we synthesized core-shell structured magnetic CdxZn1-xS@Fe3S4 semiconductor catalysts. The CdxZn1-xS shell of the catalysts possesses a wider absorption optical domain and uses light energy more efficiently than CdS. The Fe atoms of the Fe3S4 core dope into the CdxZn1-xS crystal lattice, which leads to a band gap decrease. Among all catalysts prepared, the Cd0.2Zn0.8S@Fe3S4 nanocomposites bear low band gap properties and can efficiently photocatalyze the degradation of methylene blue under the irradiation of simulated sunlight. Under an external magnetic field, the CdxZn1-xS@Fe3S4 catalysts can be recovered and reused several times without loss of catalytic activity. (C) 2017 Elsevier B.V. All rights reserved.

关键词： Semiconductor catalyst Photocatalyst Photodegradation Core-shell structure Magnetic separation

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Effect of wastewater particles on catalytic ozonation in the advanced treatment of petrochemical secondary effluent

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CheMICAL ENGINEERING JOURNAL 2018年 345卷 280-289页

作者： Zhang, Siyu Wu, Changyong Zhou, Yuexi Wang, Yaning he, xuwen China Univ Min & Technol Sch Chem & Environm Engn Beijing 100083 Peoples R China Chinese Res Inst Environm Sci State Key Lab Environm Criteria & Risk Assessment Beijing 100012 Peoples R China Chinese Res Inst Environm Sci Res Ctr Water Pollut Control Technol Beijing 100012 Peoples R China Dalian Ocean Univ Sch Marine Sci & Technol & Environm Dalian 116032 Liaoning Peoples R China

The effect of wastewater particles on catalytic ozonation during the treatment of petrochemical secondary effluent (PSE) was investigated. The dissolved organic carbon (DOC) removal results indicated that wastewater particles could significantly affect the catalytic oxidation reaction and increase ozone (O-3) consumption. When the suspended solids (SS) was filtered by the 0.45 mu m membrane, the O-3 dosage to DOC removal ratio was 1.99 mg(O3) mg(DOC)(-1), while it increased to 2.99 mg(O3) mg(DOC)-1 when the SS concentration was 50 +/- 1.57 mg L-1. Wastewater particles can react with O-3, thus reducing the O-3 and hydroxyl radicals (% OH) available for DOC removal. When the SS concentration was 30 +/- 0.96 mg L-1, O-3 dosages lower than 10 mg L-1 did not induce a change in the size and surface characteristics of the particles. Following the increase in the O-3 dosage to 36 mg L-1, extracellular polymeric substances (EPS) reacted with O-3/(center dot) OH with different characteristics. Dissolved organic matter (DOM) had the highest depletion reaction rate, followed by the loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS). The average reaction rates of the three constituents were 1.44, 0.212, and 0.079 mg L-1 min(-1), respectively. In addition, the results showed that eliminating wastewater particles would be beneficial for the removal of organic micro-pollutants (OMPs) by catalytic ozonation.

关键词： Organic micro-pollutants (OMPs) Biological flocs Catalytic ozonation Extracellular polymeric substances (EPS) Excitation-emission matrix (EEM)

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Synthesis of Cd_xZn_1-xS@MIL-101(Cr) Composite Catalysts for the Photodegradation of Methylene Blue

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NANO 2018年第10期13卷

作者： Yang, Shipeng Peng, Siwei Zhang, Chunhui he, xuwen Cai, Yaqi China Univ Min & Technol Sch Chem & Environm Engn Beijing 11 Xueyuan Rd Beijing 100083 Peoples R China Chinese Acad Sci Res Ctr Ecoenvironm Sci 18 Shuangqing Rd Beijing 100085 Peoples R China Univ Chinese Acad Sci 19 A Yuquan Rd Beijing 100049 Peoples R China

Nanoparticles of the semiconductor catalyst CdxZn1-xS were embedded into the metal organic framework MIL-101(Cr) to obtain CdxZn1-xS@MIL-101 (Cr) nanocomposites. These materials not only possess high surface areas and mesopores but also show good utilization of light energy. The ultraviolet-visible diffuse reflectance patterns of CdxZn1-xS@MIL-101 (Cr) nanocomposites showed that Cd0.8Zn0.2S@MIL-101(Cr) possessed good visible light response ability among the synthesized nanocomposites. The photocatalytic performance of the CdxZn1-xS@MIL-101 (Cr) nanocomposites were tested via degradation and mineralization of methylene blue in neutral water solution under light irradiation using a 300W xenon lamp. As a result, using Cd0.8Zn0.2S@MIL-101(Cr) as a catalyst, 99.2% of methylene blue was mineralized within 30 min. Due to the synergistic effect of adsorption by the MIL-101(Cr) component and photocatalytic degradation provided by the Cd0.8Zn0.2S component, the Cd0.8Zn0.2S@MIL-101(Cr) catalyst displayed superior photocatalytic performance relative to Cd0.8Zn0.2S@MIL-101(Cr). Furthermore, Cd0.8Zn0.2S@MIL-101(Cr) possessed excellent stability during photodegradation and exhibited good reusability. The remarkable photocatalytic performance of Cd0.8Zn0.2S@MIL-101(Cr) is likely due to the effective transfer of electrons and holes at the heterojunction interfaces.

关键词： CdxZn1-xS@MIL-101(Cr) photodegradation methylene blue

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Evaluating tetracycline degradation pathway and intermediate toxicity during the electrochemical oxidation over a Ti/Ti₄O₇ anode

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WATER RESEARCH 2018年 137卷 324-334页

作者： Wang, Jianbing Zhi, Dan Zhou, Hao he, xuwen Zhang, Dayi China Univ Min & Technol Sch Chem & Environm Engn Beijing Campus Beijing 100083 Peoples R China Tsinghua Univ Sch Environm Beijing 100084 Peoples R China

Tetracycline (TC) is one of the most widely used antibiotics with significant impacts on human health and thus it needs appropriate approaches for its removal. In the present study, we evaluated the performance and complete pathway of the TC electrochemical oxidation on a Ti/Ti4O7 anode prepared by plasma spraying. Morphological data and composition analysis indicated a compact coating layer on the anode, which had the characteristic peaks of Ti4O7 as active constituent The TC electrochemical oxidation on the Ti/Ti4O7 anode followed a pseudo-first-order kinetics, and the TC removal efficiency reached 95.8% in 40 min. The influential factors on TC decay kinetics included current density, anode-cathode distance and initial TC concentration. This anode also had high durability and the TC removal efficiency was maintained over 95% after five times reuse. For the first time, we unraveled the complete pathway of the TC electrochemical oxidation using high-performance liquid chromatograph (HPLC) and gas chromatograph (GC) coupled with mass spectrometer (MS). center dot OH radicals produced from electrochemical oxidation attack the double bond, phenolic group and amine group of TC, forming a primary intermediate (m/z = 461), secondary intermediates (m/z = 432, 477 and 509) and tertiary intermediates (rn/z = 480, 448 and 525). The latter were further oxidized to the key downstream intermediate (m/z = 496), followed by further downstream intermediates (rn/z = 451, 412, 396, 367, 351, 298 and 253) and eventually short-chain carboxylic acids. We also evaluated the toxicity change during the electrochemical oxidation process with bioluminescent bacteria. The bioluminescence inhibition ratio peaked at 10 min (55.41%), likely owing to the high toxicity of intermediates with m/z = 461, 432 and 477 as obtained from quantitative structure activity relationship (QSAR) analysis. The bioluminescence inhibition ratio eventually decreased to 16.78% in 40 min due to further transformation

关键词： Tetracycline Ti/Ti4O7 anode Electrochemical oxldation Degradation pathway Toxicity assessment

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矿井水井下-地面分级分质高效利用与智能调配技术

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煤矿安全 2021年第5期52卷 96-103,111页

作者：侯嫔段书乐范业承于躍何绪文伯磊张子航中国矿业大学(北京)化学与环境工程学院北京100083 中国矿业大学(北京)机电与信息工程学院北京100083

针对目前矿井水处理后回用成本高、时空分配不均和循环利用率低等问题,通过矿井水水量平衡和回用水质数据分析,探究了大海则矿区矿井水量质耦合变化规律,采用大数据计算和嵌入式系统设计,形成了矿区矿井水井下-地面高效利用途径和智能... 详细信息

针对目前矿井水处理后回用成本高、时空分配不均和循环利用率低等问题,通过矿井水水量平衡和回用水质数据分析,探究了大海则矿区矿井水量质耦合变化规律,采用大数据计算和嵌入式系统设计,形成了矿区矿井水井下-地面高效利用途径和智能调配技术。结果表明:大海则矿区原矿井水就地利用率低,仅为矿井总排水量的22.1%,水质为高浊和高硬度,在时间与空间上具有水量水质分配不协调的特点;基于此,重构了矿区矿井水水量平衡图,形成了矿井水井下-地面分级分质的综合利用技术,可将矿井水回用率提高到100%;同时,构建了兼具实时监测、无线传输与大数据储用的智能调配系统,为煤矿区矿井水的高效利用与多目标协同智能化控制提供了理论依据。

关键词：矿井水井下-地面水量平衡高效利用智能调配

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