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Adsorption equilibrium and kinetics studies of divalent manganese from phosphoric acid solution by using cationic exchange resin

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Chinese Journal of Chemical Engineering 2020年第11期28卷 2758-2770页

作者： Haibo Zhuang yanjun zhong Lin Yang School of Chemical Engineering Sichuan UniversityChengdu 610065China

There are numerous impurities in wet-process phosphoric acid,among which manganese is one of detrimental metallic impurities,and it causes striking negative effects on the industrial phosphoric acid production and downstream commodity.This article investigated the adsorption behavior of manganese from phosphoric acid employing Sinco-430 cationic ion-exchange resin.Resorting FT-IR and XPS characterizations,the adsorption mechanism was proved to be that manganese was combined with sulfonic acid group.Several crucial parameters such as temperature,phosphoric acid content and resin dose were studied to optimize adsorption efficiency.Through optimization,removal percentage and sorption capacity of manganese reached 53.12 wt%,28.34 mg·g^-1,respectively.Pseudo-2nd-order kinetic model simulated kinetics data best and the activation energy was evaluated as 6.34 kJ·mol^-1 for the sorption reaction of manganese.In addition,the global adsorption rate was first controlled by film diffusion process and second determined by pore diffusion process.It was found that the resin could adsorb up to 50.24 mg·g^-1 for manganese.Equilibrium studies showed that Toth adsorption isotherm model fitted best,followed by Temkin and Langmuir adsorption isotherm models.Thermodynamic analysis showed that manganese adsorption was an endothermic process with enhanced randomness and spontaneity.

关键词： Manganese Ion exchange Phosphoric acid Kinetics Isotherm Thermodynamics

Mechanism and kinetics study on removal of Iron from phosphoric acid by cation exchange resin

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Chinese Journal of Chemical Engineering 2019年第5期27卷 1050-1057页

作者： Xinke Leng yanjun zhong Dehua Xu Xinlong Wang Lin Yang School of Chemical Engineering Sichuan University

Iron element is one of the main impurities in wet-process phosphoric acid and it has a significant impact on the subsequent phosphorus chemical products. This paper studied the feasibility of using Sinco-430 cation exchange resin for iron removal from phosphoric acid. The specific surface area and the total exchange capacity of resin were 8.91 m2·g-1 and 5.18 mmol·g-1, respectively. The sorption mechanism was determined by FTIR and XPS and the results indicated that iron was combined with-SO3 H in resin. The removal process was studied as a function of temperature, H3 PO4 content and mass ratio between resin and solution. The unit mass of resin to remove iron was 0.058 g·g-1 resin when the operating parameters were T = 50 ℃, H3 PO4 content = 27.61 wt%and S/L = 0.1, respectively. Kinetics study demonstrated that pseudo-second-order reaction model fits this study best and the calculated activation energy of overall reaction is 29.10 kJ·mol-1. The overall reaction process was mainly controlled by pore diffusion.

关键词： Purification of wet-process phosphoric acid Cation exchange resin Kinetics models Diffusion models

Leaching calcium from phosphogypsum desulfurization slag by using ammonium chloride solution: Thermodynamics and kinetics study

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Chinese Journal of Chemical Engineering 2020年第1期28卷 208-215页

作者： yanjun zhong Ting Shi Qiuge Chen Xiushan Yang Dehua Xu Zhiye Zhang Xinlong Wang Benhe zhong School of Chemical Engineering Engineering Research Center of Comprehensive Utilization and Clean Processing of Phosphorus Resources of Ministry of EducationSichuan UniversityChengdu 610065China

Phosphogypsum(PG) desulfurization slag is a calcium-rich residue from reductive decomposition of PG using sulfur as the reductant. We proposed a technology of preparation light calcium carbonate with PG desulfurization slag, which mainly contains two steps: leaching and carbonizing. In this work, we concentrated on the former, in which ammonium chloride aqueous solution was utilized as leaching agent to extract calcium from the slag, and conducted thermodynamics and kinetics study on it. Fact Sage software was employed to do thermodynamic and phase equilibrium diagram calculations. The influence of leaching conditions including agitation speed, initial concentration of leaching solution, reaction temperature, and liquid/solid ratio on the calcium leaching rate was discussed in detail by means of experiment optimal design. A kinetic model developed from the shrinking core model was given to describe the leaching process. The apparent kinetic activation energy(Ea) of the leaching reaction was calculated to be 10.58 kJ·mol^-1.

关键词： PG desulfurization slag Leaching process Thermodynamics Kinetic model

An Approach towards Synthesis of Nanoarchitectured LiNi1/3Co1/3Mn1/3O2 Cathode Material for Lithium Ion Batteries

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中国化学:英文版 2015年第2期33卷 261-267页

作者： Weibo Hua Yanjie Wang yanjun zhong Guoping Wang Benhe zhong Baizeng Fang Xiaodong Guo Shixuan Liao Haijiang Wang College of Chemical Engineering Sichuan UniversityChengduSichuan 610065China Department of Chemical and Biological Engineering University of British Columbia2360 East MallVancouverBCCanadaV6T 1Z3 Institute for Fuel Cell Innovation National Research Council of Canada4250 Wesbrook MallVancouverBC V6T 1W5Canada College of Chemical Engineering University of South ChinaHengyangHunan 421001China

To explore advanced cathode materials for lithium ion batteries(LIBs),a nanoarchitectured LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2)(LNCM)material is developed using a modified carbonate coprecipitation method in combination with a vacuum distillation-crystallisation process.Compared with the LNCM materials produced by a traditional carbonate copre-cipitation method,the prepared LNCM material synthesized through this modified method reveals a better hexago-nal layered structure,smaller particle sizes(ca.110.5 nm),and higher specific surface areas.Because of its unique structural characteristics,the as-prepared LNCM material demonstrates excellent electrochemical properties in-cluding high rate capability and good cycleability when it is utilized as a cathode in the lithium ion battery(LIB).

关键词： cathode materials nanoarchitectured coprecipitation electrochemical properties lithium ion battery

Solubility and solution thermodynamics of ammonium dihydrogen phosphate in the water–methanol system

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Chinese Journal of Chemical Engineering 2019年第10期27卷 2518-2525页

作者： Dejun Xu Dehua Xu yanjun zhong Tao Luo Xiushan Yang Zhiye Zhang Lin Yang Xinlong Wang School of Chemical Engineering Sichuan UniversityChengdu 610065China

The solubility of ammonium dihydrogen phosphate(MAP)in the water–methanol system is essential for antisolvent crystallization studies.To investigate the effect of methanol on the solubility of MAP in water,the solubility of MAP in the water–methanol system was determined by dynamic method and static equilibrium method at temperatures ranging from 293.2 to 343.2 K at atmospheric pressure.Results showed that the solubility of MAP increased with the increase of temperature and the increase of water mole fraction in the water–methanol system.The experimental solubility data were correlated with the modified Apelblat equation,the combined nearly ideal binary solvent/Redlich–Kister(CNIBS/R–K)model and the Jouyban–Acree model.The calculated results based on these three models were in very good agreement with the experimental data with the average relative deviations of 0.65%,0.97%,and 5.38%,respectively.Simultaneously,the thermodynamic properties of the MAP dissolution process in the water–methanol system,including Gibbs energy change,enthalpy,and entropy were obtained by the Van’t Hoff equation,which can be used to assess the crystallization process.

关键词： Ammonium dihydrogen phosphate Solubility Water–methanol system

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内锥型空心弹关键参数与阻力特性仿真研究

兵器装备工程学报 2024年第5期45卷 52-57页

作者：郑艳军钟建华李昌坤杨慧西南技术工程研究所重庆400039

为了揭示内锥型空心弹关键参数与阻力特性之间的关系,基于30 mm口径内锥型空心弹模型,通过改变锲角和喉径比关键参数,利用计算流体动力学软件Fluent对空心弹在不同马赫数下进行数值仿真,得到了不同参数下的阻力特性。结果表明:在喉径比... 详细信息

为了揭示内锥型空心弹关键参数与阻力特性之间的关系,基于30 mm口径内锥型空心弹模型,通过改变锲角和喉径比关键参数,利用计算流体动力学软件Fluent对空心弹在不同马赫数下进行数值仿真,得到了不同参数下的阻力特性。结果表明:在喉径比为0.2时,空心弹会发生阻塞现象,单独增加马赫数不能消除阻塞;消除阻塞前,在同一马赫数条件下,随着喉径比不断增加,阻力系数数值逐渐减小,尤其在阻塞临界点附近,阻力系数数值会出现骤降;消除阻塞后,随着喉径比不断增加,阻力系数数值变化不明显;消除阻塞现象所需马赫数随喉径比增加逐渐减小,喉径比越大越易于消除阻塞问题。锲角的大小对阻力特性影响较大,锲角越大,越易于造成阻塞现象;在喉径比和马赫数相同条件下,锲角越大阻力系数数值越大。在锲角和喉径比相同时,马赫数越大阻力系数值反而越小。在空心弹及类似弹丸设计时,需同时兼顾锲角、喉径比和马赫数对气动特性的影响。

关键词：内锥型空心弹阻力系数仿真阻塞锲角喉径比

L.reuteri ZJ617 inhibits inflammatory and autophagy signaling pathways in gut-liver axis in piglet induced by lipopolysaccharide

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Journal of Animal Science and Biotechnology 2022年第2期13卷 551-566页

作者： Tao Zhu Jiangdi Mao Yifan zhong Congxiang Huang Zhaoxi Deng yanjun Cui Jianxin Liu Haifeng Wang The Key Laboratory of Molecular Animal Nutrition Ministry of EducationCollege of Animal ScienceZhejiang UniversityHangzhou 310058China Xixi Hospital of Hangzhou Hangzhou 310023China

Background:This study investigated the protective effects of L.reuteri ZJ617 on intestinal and liver injury and the underlying mechanisms in modulating inflammatory,autophagy,and apoptosis signaling pathways in a piglet challenged with lipopolysaccharide(LPS).Methods:Duroc×Landrace×Large White piglets were assigned to 3 groups(n=6/group):control(CON)and LPS groups received oral phosphate-buffered saline for 2 weeks before intraperitoneal injection(i.p.)of physiological saline or LPS(25μg/kg body weight),respectively,while the ZJ617+LPS group was orally inoculated with ZJ617 for 2 weeks before i.***.of LPS.Piglets were sacrificed 4 h after LPS injection to determine intestinal integrity,serum biochemical parameters,inflammatory signaling involved in molecular and liver injury pathways.Results:Compared with controls,LPS stimulation significantly increased intestinal phosphorylated-p38 MAPK,phosphorylated-ERK and JNK protein levels and decreased IκBαprotein expression,while serum LPS,TNF-α,and IL-6 concentrations(P<0.05)increased.ZJ617 pretreatment significantly countered the effects induced by LPS alone,with the exception of p-JNK protein levels.Compared with controls,LPS stimulation significantly increased LC3,Atg5,and Beclin-1 protein expression(P<0.05)but decreased ZO-1,claudin-3,and occludin protein expression(P<0.05)and increased serum DAO and D-xylose levels,effects that were all countered by ZJ617 pretreatment.LPS induced significantly higher hepatic LC3,Atg5,Beclin-1,SOD-2,and Bax protein expression(P<0.05)and lower hepatic total bile acid(TBA)levels(P<0.05)compared with controls.ZJ617 pretreatment significantly decreased hepatic Beclin-1,SOD2,and Bax protein expression(P<0.05)and showed a tendency to decrease hepatic TBA(P=0.0743)induced by LPS treatment.Pretreatment of ZJ617 before LPS injection induced the production of 5 significant metabolites in the intestinal contents:capric acid,isoleucine 1TMS,glycerol-1-phosphate byproduct,linoleic acid,alanine-alanine(P<0.05).Conclusions:These results demonstrated

关键词： Gut-liver axis Hepatic injury Intestinal barrier Lactobacillus Piglet Signaling pathways

核磁共振技术在二氧化碳地质封存与利用中的应用研究前景综述

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地球物理学进展 2024年第1期39卷 225-240页

作者：钟高润吴彦君王帅李亚婷雷开宇李亚军杨莎莎延安大学石油工程与环境工程学院延安716000 延安市油气高效管输与流动保障工程技术研究中心延安716000 油气资源高效开发与生态环境保护陕西高校工程研究中心延安716000 陕西延长油田(集团)油气勘探公司延安716000

二氧化碳地质封存与利用是推动“碳达峰、碳中和”的关键技术之一,研究CO_(2)注入-运移-封存全过程储层孔隙率、渗透率、饱和度、孔隙结构及岩石力学参数的变化规律是监测CO_(2)地质封存状态和泄露风险的核心工作.以分析核磁共振技术在... 详细信息

二氧化碳地质封存与利用是推动“碳达峰、碳中和”的关键技术之一,研究CO_(2)注入-运移-封存全过程储层孔隙率、渗透率、饱和度、孔隙结构及岩石力学参数的变化规律是监测CO_(2)地质封存状态和泄露风险的核心工作.以分析核磁共振技术在研究孔隙结构、CO_(2)运移特征及岩石力学参数变化的应用现状和发展趋势为目标,在简要介绍核磁共振仪器设备和应用领域基础上,分析核磁共振技术在CO_(2)地质封存与利用中的应用现状和发展方向.分析表明:核磁共振技术在致密油、页岩气等非常规油气资源开发中应用广泛,在表征储层物性、饱和度和三维孔隙结构方面优势明显.目前,利用核磁共振技术研究原位CO_(2)封存条件下岩心动态参数成果较少,无论是CO_(2)驱油还是CO_(2)置换CH4,均通过测量氢核的核磁共振特征或核磁成像特征来反推CO_(2)分布状态;在CO_(2)-EOR、CCS先导性实验中,时移测井资料十分有限,制约了原位CO_(2)注入-运移-矿化等核磁共振定性与定量表征;咸水层原位CCS/CCUS过程核磁共振表征实验相对较少,已有研究成果多集中在煤层CO_(2)置换CH4、CO_(2)与CH4竞争性吸附等研究领域,未建立实验条件下CO_(2)溶解与CO_(2)注入后核磁共振共振响应信号间的对应关系及表征模型,制约了核磁共振测井在CO_(2)地质封存与利用中的应用.因此,需开展原位CO_(2)注入岩心全过程核磁共振表征技术研究,配备CT实时扫描系统,建立原位CO_(2)地质封存与利用的核磁共振表征模型,为利用时移测井开展CO_(2)地质封存与利用的动态监测、安全性评价提供技术支撑.

关键词：二氧化碳地质封存与利用核磁共振碳达峰碳中和

重金属暴露与肾功能的关联性研究:基于代谢综合征人群的横断面研究证据

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中国无机分析化学 2024年第1期14卷 1-8页

作者：张皓文王家林朱劲刚李彦君钟旭龙刚孙广东张敏天津医科大学人民临床学院天津300121 天津市人民医院肾内科天津300121

探索代谢综合征人群中重金属暴露与肾功能的相关性,为特定人群中慢性肾脏病的诊治提供新思路。基于2011—2018年美国健康与营养调查数据,纳入2 474名代谢综合征患者作为研究对象;探讨四种血液金属元素(包括镉、铅、硒、锰)对肾功能的影... 详细信息

探索代谢综合征人群中重金属暴露与肾功能的相关性,为特定人群中慢性肾脏病的诊治提供新思路。基于2011—2018年美国健康与营养调查数据,纳入2 474名代谢综合征患者作为研究对象;探讨四种血液金属元素(包括镉、铅、硒、锰)对肾功能的影响。肾功能主要通过慢性肾病(CKD)、估计的肾小球滤过率(eGFR),尿微量白蛋白肌酐比(UACR)和尿酸(UA)评估。通过加权多因素Logistic回归模型及线性回归模型分析血液中金属元素水平与肾功能的关系。进一步按照年龄、性别、体质量指数(BMI)、是否患高血压、糖尿病及血脂异常进行亚组分析。研究发现血液中镉、铅水平与CKD的发生呈正相关,与eGFR呈现负相关。血硒与CKD的发生存在负向关联,而血锰与eGFR水平存在正相关(P<0.05)。而亚组分析结果显示,女性及老年代谢综合征患者对于金属暴露的效应更为敏感。代谢综合征人群中重金属暴露与肾功能存在关联,铅、镉暴露可能会导致肾功能受损,而硒、锰暴露则可能会起到一定的保护作用。

关键词：重金属代谢综合征慢性肾病营养与健康调查