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Boosting the catalytic performance of Cu-SAPO-34in NO_(x) removal via hydrothermal treatment

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Journal of environmental sciences 2024年第1期135卷 640-655页

作者： Xiaoyan tian Huimin Wang Siyuan Xu lianyun Gao Jinyan Cao Jianjun Chen Qiulin Zhang ping ning Jiming Hao faculty of environmental science and engineering Kunming University of Science and TechnologyKunming 650500China National-Regional engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries Kunming University of Science and TechnologyKunming 650500China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution ControlTsinghua UniversityBeijing 100084China

Phosphate ions promoted Cu-SAPO-34(P-Cu-SAPO-34)were prepared using bulk CuO particles as Cu^(2+)precursor by a solid-state ion exchange technique for the selective catalytic reduction of NO_(x) with NH_3(NH_3-SCR).The effects of high temperature(H-T)hydrothermal aging on the NO_(x) removal(de-NO_(x))performance of Cu-SAPO-34 with and without phosphate ions were systematically investigated at atomic *** results displayed that both Cu-SAPO-34 and P-Cu-SAPO-34 presented relatively poor NO_(x) removal activity with a low conversion(<30%)at 250-500℃.However,after H-T hydrothermal treatment(800℃ for 10 hr at 10%H_2O),these two samples showed significantly satisfied NO_(x) elimination performance with a quite high conversion(70%-90%)at 250-500℃.Additionally,phosphate ions decoration can further enhance the catalytic performance of Cu-SAPO-34 after hydrothermal treatment(Cu-SAPO-34H).The textural properties,morphologies,structural feature,acidity,redox characteristic,and surface-active species of the fresh and hydrothermally aged samples were analyzed using various characterization *** systematical characterization results revealed that increases of 28%of the isolated Cu^(2+)active species(Cu^(2+)-2Z,Cu(OH)^(+)-Z)mainly from bulk CuO and 50%of the Bronsted acid sites,the high dispersion of isolated Cu^(2+)active component as well as the Bronsted acid sites were mainly responsible for the accepted catalytic activity of these two hydrothermally aged samples,especially for P-Cu-SAPO-34H.

关键词： NH_(3)-SCR Cu-SAPO-34 Hydrothermal induced Phosphate ions

Zonal activation of molecular carbon dioxide and hydrogen over dual sites Ni-Co-MgO catalyst for CO_(2) methanation:Synergistic catalysis of Ni and Co species

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Journal of Energy Chemistry 2024年第4期91卷 213-225页

作者： Zonglin Li Jianjun Chen Yu Xie Junjie Wen Huiling Weng Mingxue Wang Jingyi Zhang Jinyan Cao Guocai tian Qiulin Zhang ping ning faculty of environmental science and engineering Kunming University of Science and TechnologyKunming 650500YunnanChina National-Regional engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries Kunming University of Science and TechnologyKunming 650500YunnanChina faculty of Metallurgical and Energy engineering Kunming University of Science and TechnologyKunming 650093YunnanChina

An in-depth mechanism in zonal activation of CO_(2)and H2molecular over dual-active sites has not been revealed ***,Ni-Co-MgO was rationally constructed to elucidate the CO_(2)methanation *** abundant surface nickel and cobalt components as active sites led to strong Ni-Co interaction with charge transfer from nickel to ***,electron-enriched Coδ-species participated in efficient chemisorption and activation of CO_(2)to generate monodentate ***,plentiful available Ni0sites facilitated H2dissociation,thus CO_(2)and H2were smoothly activated at zones of Coδ-species and Ni0,*** in situ DRIFTS,quasi situ XPS,TPSR,and DFT calculations substantiated a new formate evolution mechanism via monodentate carbonate instead of traditional bidentate carbonate based on synergistic catalysis of Coδ-species and *** zonal activation of CO_(2)and H2by tuning electron behaviors of double-center catalysts can boost heterogeneous catalytic hydrogenation performance.

关键词： Zonal activation CO_(2) methanation Dual active sites Synergistic effect

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铜冶炼烟尘金属分离及资源回收研究进展

中南大学学报（自然科学版） 2024年第3期55卷 882-894页

作者：蔡兵陶雷王郎郎王学谦田森林宁平王润东昆明理工大学环境科学与工程学院云南昆明650500 云南锡业股份有限公司铜业分公司云南个旧661000 安庆师范大学资源环境学院安徽安庆246133

以铜冶炼烟尘为研究对象,分析其理化及矿物学性质,对比铜冶炼烟尘金属分离与回收方法,包括碳热还原法、硫酸浸出法、碱性浸出法和湿法-火法联合工艺,总结各方法的原理、典型工艺、现状和存在问题,阐述非常规冶金方法在铜冶炼烟尘金属分... 详细信息

以铜冶炼烟尘为研究对象,分析其理化及矿物学性质,对比铜冶炼烟尘金属分离与回收方法,包括碳热还原法、硫酸浸出法、碱性浸出法和湿法-火法联合工艺,总结各方法的原理、典型工艺、现状和存在问题,阐述非常规冶金方法在铜冶炼烟尘金属分离中的应用,展望铜冶炼烟尘资源回收的发展方向。研究结果表明:铜冶炼烟尘中砷、铜、锌含量受冶炼工艺、原矿品质的影响,不同元素赋存形态存在差异。碳热还原法可以通过金属砷酸盐和氧化物分解的方式释放砷,从而实现砷与其他有价金属的分离;硫酸浸出法可以高效浸提铜冶炼烟尘中的金属,实现多元素的回收;碱性浸出法可选择性浸提砷;湿法-火法联合工艺结合了火法工艺选择性分离砷和湿法工艺高效提取金属的优点,对于复杂高砷铜冶炼烟尘处理具有优势。铜冶炼烟尘兼具资源属性和环境风险,实现清洁生产及多金属资源化利用仍是关键,砷的无害化处置与锌、铜、铅等有价金属的高效协同回收工艺及分离机制、全过程物质流与环境效应是铜冶炼烟尘资源回收的发展方向。

关键词：铜冶炼烟尘资源回收火法湿法

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可逆表面活性剂的制备及性能

武汉理工大学学报 2010年第5期32卷 105-108,112页

作者：李英杰田森林宁平昆明理工大学环境科学与工程学院昆明650093

采用酰胺缩醛法合成了3种不同碳链长度的可逆表面活性剂:N’-辛烷基-N,N-二甲基乙脒(ODAA)、N’-十二烷基-N,N-二甲基乙脒(DDAA)、N’-十六烷基-N,N-二甲基乙脒(HDAA)相应碳酸盐。1H NMR表征结果表明ODAA、DDAA和HDAA的分子结构与理论... 详细信息

采用酰胺缩醛法合成了3种不同碳链长度的可逆表面活性剂:N’-辛烷基-N,N-二甲基乙脒(ODAA)、N’-十二烷基-N,N-二甲基乙脒(DDAA)、N’-十六烷基-N,N-二甲基乙脒(HDAA)相应碳酸盐。1H NMR表征结果表明ODAA、DDAA和HDAA的分子结构与理论结构吻合,纯度为95%;ODAA、DDAA及HDAA 3种乙脒碳酸盐的临界胶束浓度(CMC)分别为6.90 mmol/L、0.50 mmol/L0、.04 mmol/L,仅为相同碳链长度直链季铵盐阳离子表面活性剂CMC值的1/40、1/30及1/25,表明N’-烷-基N,N-二甲基乙脒碳酸盐具有良好的表面活性和增溶潜力;测定了HDAA碳酸盐溶液先后通入CO2和空气时的电导率,当通入CO2,电导率从60μS/cm上升至160μS/cm;接着通入空气,电导率又降至60μS/cm,显示出良好的可逆变换能力。研究结果表明,乙脒碳酸盐不但具有更强的增溶潜力,而且可通过空气/CO2"开关",控制其表面活性,是一种新型的增溶剂。

关键词：可逆表面活性剂 N’-烷-基N,N-二甲基乙脒增溶

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熔融碱吸收高浓度CFC-12废气的研究

武汉理工大学学报 2010年第13期32卷 97-99页

作者：高红宁平邹金宝刘天成郑少聪昆明理工大学环境科学与工程学院昆明650093

用熔融NaOH对高浓度CFC-12废气的吸收进行实验研究,分别考察了进气浓度、水蒸气的存在、反应温度、NaOH用量、进气流量对吸收效率的影响。结果表明：在有水蒸气,反应温度高于318℃,NaOH用量大于60 g,气体流量25 mL/min的条件下,熔融NaO... 详细信息

用熔融NaOH对高浓度CFC-12废气的吸收进行实验研究,分别考察了进气浓度、水蒸气的存在、反应温度、NaOH用量、进气流量对吸收效率的影响。结果表明：在有水蒸气,反应温度高于318℃,NaOH用量大于60 g,气体流量25 mL/min的条件下,熔融NaOH对浓度0.1%-1%之间的CFC-12废气吸收效率在99%以上,CFC-12的分解产物被熔融NaOH吸收,减少了二次污染。并且在一定的NaOH用量,进气流量,进气浓度条件下,有水蒸气和提高反应温度可以大幅度的提高吸收效率。

关键词：熔融碱吸收氟利昂-12

Reversibly enhanced aqueous solubilization of volatile organic compounds using a redox-reversible surfactant

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Journal of environmental sciences 2011年第9期23卷 1486-1490页

作者： Yingjie Li senlin tian Hong Mo ping ning faculty of environmental science and engineering Kunming University of Science and Technology Kunming 650093 China

Surfactant-enhanced remediation （SER） is an effective method for the removal of volatile organic compounds （VOCs） from contaminated soils and *** reuse the surfactant the VOCs must be separated from the surfactant *** water solubility of VOCs can be enhanced using reversible surfactants with a redox-acive group,（ferrocenylmethyl）dodecyldimethylammonium bromide （Fc12） and （ferrocenylmethyl）tetradecanedimethylammonium bromide （Fc14）,above and below their critical micelle concentrations （CMC） under reducing （I ＋） and oxidative （I 2＋） *** CMC values of Fc12 and Fc14 in I ＋ are 0.94 and 0.56 mmol/L and the solubilization of toluene by Fc12 and Fc14 in I ＋ for toluene is higher than the solubilization achieved with sodium dodecyl sulfate,cetyltrimethylammonium bromide and Trition *** solubilization capacity of the ferrocenyl surfactants for each tested VOCs ranked as follows： ethylbenzene toluene *** solubilities of VOCs by reversible surfactant in I ＋ were 30% higher than those in I 2＋ at comparable surfactant *** effects of Fc14 concentrations on VOCs removal efficiency were as follows： benzene toluene ***,an improved removal efficiency was achieved at low ferrocenyl surfactant ***,the reversible surfactant could be recycled through chemical approaches to remove organic pollutants,which could significantly reduce the operating costs of SER technology.

关键词： ferrocenyl surfactant reversibility solubility VOCs

基于三维电芬顿法的咖啡初加工废水有机物去除特性分析

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昆明理工大学学报（自然科学版） 2024年第3期49卷 239-249页

作者：黄建洪张亘赵世民朱彬程明豪谢鑫田森林宁平昆明理工大学环境科学与工程学院云南昆明650500 冶金与化工行业废气资源化国家地方联合工程研究中心云南昆明650500 云南省生态环境科学研究院云南昆明650034 云南省高原湖泊流域污染过程与管理重点实验室云南昆明650034

针对咖啡初加工废水有机物浓度高、难降解、可生化性差等问题,构建了钛基镀钌铱电极为阳极板、泡沫镍为阴极板、铁碳粒子为粒子电极的三维电芬顿体系,对咖啡初加工废水进行预处理.通过单因素实验发现,当板间距为4 cm、初始pH为4.0、电... 详细信息

针对咖啡初加工废水有机物浓度高、难降解、可生化性差等问题,构建了钛基镀钌铱电极为阳极板、泡沫镍为阴极板、铁碳粒子为粒子电极的三维电芬顿体系,对咖啡初加工废水进行预处理.通过单因素实验发现,当板间距为4 cm、初始pH为4.0、电流密度为32 mA/cm^(2)、粒子电极投加量为20 g/L、曝气强度为4 L/min、反应时间为90 min的条件下,咖啡初加工废水COD去除率可达69.29%,UV 254去除率可达72.92%,色度去除率可达96.69%,B/C从0.28提升至0.43.通过对比铁碳微电解、传统电芬顿和三维电芬顿对咖啡初加工废水COD去除效果发现,三维电芬顿体系物质传递速率以及传质效果都有大幅提升.通过自由基淬灭实验、三维荧光光谱、傅里叶红外光谱和GC-MS分析,发现羟基自由基在咖啡初加工废水的降解过程中起主导作用,原水中90种有机污染物降至39种,难降解腐殖酸类大分子有机物已经得到了较为彻底地去除,大部分被降解为小分子有机物,可生化性得到大幅提高.

关键词：咖啡初加工废水三维电芬顿羟基自由基有机污染物可生化性

Immobilization of NZVI in polydopamine surface-modified biochar for adsorption and degradation of tetracycline in aqueous solution

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Frontiers of environmental science & engineering 2018年第4期12卷 87-97页

作者： XiangyuWang Weitao lian Xin Sun Jun Ma ping ning faculty of environmental science and engineering Kunming University of Science and Technology Kunming 650500 China School of Municipal and environmental engineering State Key Laboratory of Urban Water Resources and Environment Harbin Institute of Technology Harbin 150090 China＊

Polydopamine/NZVl@biochar composite （PDA/NZVI@BC） with high removal efficiency of tetracycline （TC） in aqueous solutions was successfully synthesized, The resultant composite demonstrated high reactivity, excellent stability and reusability over the reaction course. Such excellent performance can be attributed to the presence of the huge surface area on biochar （BC）, which could enhance NZVI dispersion and prolong its longevity. The carbonyl group contained on the surface of bioehar could combine with the amino group on polydopamine（PDA）. The hydroxyl groups in PDA is able to enhance the dispersion and loading of NZVI on BC. Being modified by PDA, the hydrophilicity of biochar was improved. Among BC, pristine NZVI and PDA/NZVI（L-BC, PDA/ NZVI（a-,BC exhibited the highest activity for removal of TC. Compared with NZVI, the removal efficiency of TC could be increased by 55.9c- by using PDA/NZVI@BC under the same conditions. The optimal modification time of PDA was 813, and the ratio of NZVI to BC was 1：2. In addition, the possible degradation mechanism of TC was proposed, which was based on the analysis of degraded praducts by LC-MS. Difli,-rent importanl /actors impacling on TC removal （including mass ratio of NZVI to BC/PDA, initial concentration, pH value and the initial temperature of the solution） were investigated as well. Overall, this study provides a promising alternative material and environmental pollution management option for antibiotic wastewater treatment.

关键词： Biochar Polydopamine NZVI Modification Tetracycline

昭通市城区大气PM_(2.5)中重金属污染特征、来源及健康风险评估

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昆明理工大学学报（自然科学版） 2024年第3期49卷 250-264页

作者：史建武张俭凤毕丽玫韩新宇钟曜谦曹莹吴夏姣庞晓晨田森林宁平昆明理工大学环境科学与工程学院云南昆明650500 云南省生态环境监测中心云南昆明650034 昆明理工大学建筑工程学院云南昆明650500 西双版纳州生态环境科学研究所云南西双版纳州666100

为研究昭通市城区大气PM_(2.5)中重金属的污染特征、来源及健康风险,2018年11月、2019年1月、3月和6月在昭通市四个采样点进行四季采样,共收集了200个大气PM_(2.5)样品,利用X射线荧光光谱仪分析了PM_(2.5)中10种重金属元素(V、Cr、Mn、C... 详细信息

为研究昭通市城区大气PM_(2.5)中重金属的污染特征、来源及健康风险,2018年11月、2019年1月、3月和6月在昭通市四个采样点进行四季采样,共收集了200个大气PM_(2.5)样品,利用X射线荧光光谱仪分析了PM_(2.5)中10种重金属元素(V、Cr、Mn、Co、Ni、Cu、Zn、As、Pb和Cd).结果表明:昭通市城区PM_(2.5)浓度均值为41.88±27.05μg/m^(3),10种重金属总平均浓度为347.27±72.81 ng/m^(3),占PM_(2.5)的0.83%.其中,Cr、Mn、Ni和Zn浓度较高,分别为:75.23±22.97 ng/m^(3)、64.05±8.77 ng/m^(3)、50.22±4.20 ng/m^(3)和41.27±24.66 ng/m^(3).10种重金属总平均浓度季节变化特征和PM_(2.5)具有一致性,表现出秋季>冬季>春季>夏季的特点.PMF结果表明:以矿采及冶炼为主的工业源、交通源、燃煤源和扬尘源是昭通市城区主要的重金属来源.工业源的全年平均贡献率最高,达到了34.74%;春季扬尘源对重金属的贡献达到25.19%,远高于其他季节;而燃煤源在冬季对重金属的贡献最高,达到28.21%.气团后向轨迹聚类和PSCF分析显示:采样期间昭通市西南方向是主要的PM_(2.5)污染输送路径,来自缅甸和中国云南北部及四川南部城市的污染气团对昭通市城区空气质量有重要的影响.健康风险评估结果表明:Mn对所有人群存在非致癌风险;Cr对成年男性和女性的致癌风险值分别达到4.27×10^(-4)和3.66×10^(-4),存在致癌风险.

关键词：昭通市城区重金属污染 PM_(2.5) 重金属元素来源健康风险