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Study of plutonium recovery from acidic feed using polyethersulfone encapsulating TBP, DEHPA, and mixture of TBP and DEHPA beads 聚醚砜包封TBP、DEHPA及TBP与DEHPA混球回收酸性饲料中钚的研究
4区 工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-10-09 DOI: 10.1080/01496395.2023.2266562
Satya Ranjan Guchhait, Kankan Patra, Kartikey K. Yadav, D.K. Singh, Arijit Sengupta, T. P. Valsala, D.B. Sathe, R.B. Bhatt
ABSTRACTPolyethersulfone (PES) composite beads encapsulating the extractants di-(2-ethylhexyl) phosphoric acid (DEHPA), tributyl phosphoric acid (TBP), and mixture of DEHPA & TBP were synthesized. The synthesis was carried out using phase inversion method. Subsequently, these PES beads were applied for the recovery of plutonium [Pu (IV)] from different aqueous acidic medium. In kinetic studies, the extraction of Pu (IV) was found to be fast and equilibrium was attained within 5 minutes. In batch sorption studies, the role of aqueous acidity and nitrate ion concentration on extraction efficiency was evaluated. Also, the effects of variation of acid medium, concentration of metal ion, extractant concentration were examined for Pu (IV) recovery. Back extraction was effectively carried out using oxalic acid. The reusability of the PES beads was tested for 10 extraction – stripping cycles.KEYWORDS: Polyethersulfone composite beadsDEHPATBPsorptiondesorptionnitric acidplutoniumsorption studies AcknowledgmentsAuthors acknowledge U. Dani, C.E, NRB, BARCDisclosure statementNo potential conflict of interest was reported by the author(s).
摘要合成了包封萃取剂二(2-乙基己基)磷酸(DEHPA)、三丁基磷酸(TBP)及DEHPA - TBP混合物的聚醚砜(PES)复合微珠。采用相反转法进行合成。随后,将这些PES珠用于从不同的酸性水介质中回收钚[Pu (IV)]。在动力学研究中,发现Pu (IV)的提取速度快,在5分钟内达到平衡。在批量吸附研究中,考察了水溶液酸度和硝酸盐离子浓度对萃取效率的影响。考察了酸性介质、金属离子浓度、萃取剂浓度等因素对Pu (IV)回收率的影响。用草酸进行反萃取效果良好。对PES珠的可重复使用性进行了10次提取-剥离循环试验。关键词:聚醚磺酸复合化合物头dehpatb吸附解吸硝酸钚吸附研究作者致谢U. Dani, C.E, NRB, barc披露声明作者未报告潜在利益冲突。
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引用次数: 0
Selective removal and simultaneous immobilization of Pb cations from solutions 溶液中Pb阳离子的选择性去除和同时固定化
4区 工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-09-30 DOI: 10.1080/01496395.2023.2262745
Yunchul Cho, Jing Wang, Sungpyo Kim, Huaibin Zhang, Wenyan Huang, Sridhar Komarneni
ABSTRACTThe aim of this study was to develop a layered ammonium tin phosphate as a potential sorbent for removal of Pb2+ ions by exchange/sorption or other mechanism from contaminated solutions. A layered ammonium tin phosphate (NH4-SnP), δ-SnP – NH4 was synthesized using the hydrothermal process. XRD pattern of the NH4-SnP revealed that the final product obtained was δ-tin (IV) phosphate with the d(001)-spacing of about 14.8 Å containing ammonium ions and water molecules in the interlayers. In order to investigate the removal efficiency of Pb2+ cations by the NH4-SnP, batch-type of sorption experiments were carried out with 2 days of equilibration time at room temperature. Also, the kinetics of reaction was performed at room temperature to determine equilibrium time. The sorption isotherms for Pb2+ cations indicated that NH4-SnP showed high affinity for these ions with all the concentrations used. In addition, kinetic data showed preference for Pb2+ cations between NH4+ cation on the exchanger and Pb2+metal cation in solution. Based on these results, NH4-SnP can be proposed as an excellent sorbent for not only removal but also immobilization of Pb2+ ions from water and wastewater. Pb2+ ions were found to be immobilized as insoluble pyromorphite, Pb5(PO4)Cl after high uptakes.KEYWORDS: Pb2+ reactionPb2+ immobilizationpyromorphitePb2+ isothermδ-tin (IV) phosphate Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis research was supported by the College of Agricultural Sciences under Station Research Project No. PEN04705.
摘要研究了层状磷酸锡铵作为一种潜在的吸附剂,通过交换/吸附或其他机制去除污染溶液中的Pb2+离子。采用水热法合成了层状磷酸锡铵(NH4- snp), δ-SnP - NH4。NH4-SnP的XRD图谱显示,最终产物为δ-锡(IV)磷酸,d(001)-间距约为14.8 Å,中间层中含有铵离子和水分子。为了考察NH4-SnP对Pb2+阳离子的去除效果,在室温下进行了间歇式吸附实验,平衡时间为2天。并在室温下进行了反应动力学,确定了反应平衡时间。对Pb2+阳离子的吸附等温线表明,NH4-SnP对Pb2+阳离子具有较高的亲和力。此外,动力学数据表明,交换器上的NH4+阳离子和溶液中的Pb2+金属阳离子更倾向于Pb2+阳离子。基于这些结果,NH4-SnP可以作为一种去除和固定水中Pb2+离子的优良吸附剂。高吸收量后,发现Pb2+离子以不溶性焦闪石Pb5(PO4)Cl固定。关键词:Pb2+反应Pb2+固定化焦闪态epb2 +等温δ-锡(IV)磷酸披露声明作者未报告潜在利益冲突。本研究由农业科学院台站科研项目(No. 1)资助。PEN04705。
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引用次数: 0
Gold recovery from electronic wastes using a solvent extraction/selective back-extraction strategy 利用溶剂萃取/选择性反萃取策略从电子废弃物中回收黄金
4区 工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-09-26 DOI: 10.1080/01496395.2023.2260945
Zahra Raeisi, Bahman Farajmand, Parvaneh Nakhostin Panahi, Mohammad Reza Yaftian
ABSTRACTThe present lab-scale investigation describes a simple and efficient approach to the selective solvent extraction and recovery of gold, and copper as a by-product, from Waste Printed Circuit Boards (WPCBs) of different brands of used computers. The process comprised of three steps; leaching of scraps in aqua regia, solvent extraction process under optimized conditions, and ultimately selective back-extraction. The analysis of leach solution by inductively coupled plasma revealed, in addition to gold (0.14 wt%), copper (40.0 wt%), tin (11.9 wt%), and Ni (2.3 wt%) were the other main metals in the WPCBs. A solvent extraction procedure using trioctylamine, as extractant, dissolved in kerosene was employed for the extraction of gold as its anionic chloride-complexes from the leach liquor. The parameters affecting this process including hydrochloric acid concentration, equilibrium time, extractant concentration, initial gold concentration in the sample solution, and the aqueous/organic volume ratio were optimized by means of the statistical technique response surface methodology (RSM). Under the optimized extraction conditions, 99.6% of gold and 23.4% of copper were transferred into the organic phase, while the extracted percentage of other metal ions were negligible. Selective back-extraction by the solution 0.1 M NaOH resulted in the selective precipitation of copper, while the raffinate contained just gold ions.KEYWORDS: Goldcopperrecyclingsolvent extractionselective back-extractiontrioctylamineresponse surface methodology optimization Disclosure statementThe authors declare no conflict of interest.Statement of NoveltyThe present paper aims to report a new, low-cost, efficient, and simple solvent extraction method, using a solution of trioctylamine dissolved in kerosene, followed by a selective back-extraction procedure method, for efficient recovery of gold from leach liquor of Waste Printed Circuit Boards (WPCBs). The presented method allowed also to obtain metallic copper as the by-product
摘要本文研究了一种简单有效的方法,从不同品牌的废旧计算机印刷电路板(wpcb)中选择性溶剂萃取和回收副产物金和铜。这个过程包括三个步骤;废渣在王水中浸出,优化条件下的溶剂萃取工艺,最终选择性反萃取。通过电感耦合等离子体对浸出液的分析发现,除金(0.14 wt%)外,铜(40.0 wt%)、锡(11.9 wt%)和镍(2.3 wt%)是wpcb中的主要金属。采用煤油溶解三辛胺为萃取剂的溶剂萃取法,从浸出液中提取金的阴离子氯化物络合物。采用统计响应面法(RSM)对盐酸浓度、平衡时间、萃取剂浓度、样品溶液中初始金浓度、水有机体积比等参数进行优化。在优化的萃取条件下,99.6%的金和23.4%的铜被转移到有机相中,而其他金属离子的提取率可以忽略不计。0.1 M NaOH溶液选择性反萃取导致铜离子选择性沉淀,而萃液中只含有金离子。关键词:金铜回收溶剂萃取选择性反萃取三辛胺响应面法优化本文报道了一种新的、低成本、高效、简单的溶剂萃取方法,即用三辛胺溶解于煤油中,然后采用选择性反萃取法,从废弃印刷电路板(wpcb)浸出液中高效回收金。所提出的方法还允许获得金属铜作为副产品
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引用次数: 0
Oxidation of ferrous ions enhanced by CaMg(CO 3 ) 2 for their efficient separation from neodymium solution CaMg(co3) 2强化氧化亚铁离子对钕溶液的有效分离
4区 工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-09-25 DOI: 10.1080/01496395.2023.2262743
Kaibo Hu, Yucheng Liu, Xiaowen Zhou, Fang Gao, Chuanqi Zhang, Tianci Chen, Ke Li, Jiuyang Lin, Xuewei Li
ABSTRACTThe waste products of NdFeB magnets are an attractive resource for the recovery of rare earth elements (REEs), especially for neodymium [Nd]. Conventional methods employed to remove ferric (Fe[II]) from Nd solutions involve high energy consumption and the extensive use of chemicals, including oxidants and pH regulators, leading to substantial wastewater generation. In this work, an environmentally friendly approach utilizing CaMg(CO3)2 was presented to remove Fe(II) from Nd solution. Under optimized conditions, including a reaction temperature of 70°C, a CO32-/Fe2+ ratio of 1.5/1, a reaction time of 240 min, and an initial concentration of 200 mg/L, the heterogeneous precipitation reaction on the surface of CaMg(CO3)2 exhibited an exceptional Fe(II) removal efficiency of 98.6%, with a negligible loss of Nd (only 0.8%). It was observed that the CaMg(CO3)2 not only provide a suitable alkaline environment for the selective precipitation of Fe(II), but also significantly enrich the concentration of dissolved oxygen at a high temperature. In fact, at a CaMg(CO3)2 concentration of 2 g/L, the dissolved oxygen concentration in the solution increased significantly to 15.5 mg/L at 70°C. Consequently, the usage of CaMg(CO3)2 facilitated the rapid conversion of Fe(II) to Fe(III) without the need for additional oxidants, which was perfect for the removal of Fe(II) rather than Nd.KEYWORDS: CaMg(CO3)2ferrous ions removalneodymiumdissolved oxygenprecipitation Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis study was financially supported by the Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths (no. E03MYB0302), and the Research Projects of Ganjiang Innovation Academy, Chinese Academy of Sciences (no. E055ZA01), and the Self-deployed Projects of Ganjiang Innovation Academy, Chinese Academy of Sciences, and the Key Research Program of the Chinese Academy of Sciences (no. ZDRW-CN-2021-3), and the China National Key R&D Program (Grant no. 2022YFB3504303).
摘要钕铁硼磁体废产物是回收稀土元素,特别是钕的重要资源。从Nd溶液中去除铁(Fe[II])的传统方法涉及高能耗和大量使用化学品,包括氧化剂和pH调节剂,导致大量废水产生。本研究提出了一种利用CaMg(CO3)2从Nd溶液中去除Fe(II)的环保方法。在反应温度为70℃、CO32-/Fe2+比为1.5/1、反应时间为240 min、初始浓度为200 mg/L的条件下,CaMg(CO3)2表面非均相沉淀反应的Fe(II)去除率为98.6%,Nd的损失率为0.8%,可以忽略不计。结果表明,CaMg(CO3)2不仅为Fe(II)的选择性沉淀提供了适宜的碱性环境,而且在高温下显著富集了溶解氧浓度。事实上,在CaMg(CO3)2浓度为2 g/L时,溶液中溶解氧浓度在70℃时显著增加至15.5 mg/L。因此,CaMg(CO3)2的使用促进了Fe(II)向Fe(III)的快速转化,而不需要额外的氧化剂,这是去除Fe(II)而不是Nd的理想选择。关键词:CaMg(CO3) 2亚铁离子去除钕溶氧沉淀法披露声明作者未报告潜在利益冲突。本研究由江西省稀土清洁生产重点实验室(no. 1)资助。项目编号:E03MYB0302);项目编号:E055ZA01),中国科学院赣江创新研究院自主部署项目,中国科学院重点研究计划项目(no. 055za01);ZDRW-CN-2021-3),国家重点研发计划项目(批准号:ZDRW-CN-2021-3);2022 yfb3504303)。
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引用次数: 0
Highly efficient and selective 99TcO 4 uptake from reprocessing low-level liquid waste using a zirconium-based metal−organic framework 利用锆基金属有机骨架从低浓度废液后处理中高效、选择性地吸收99tco4
4区 工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-09-23 DOI: 10.1080/01496395.2023.2260949
Kankan Patra, Vinit K Mittal, Thichur P Valsala, Arijit Sengupta, Ashok K Sahu, Darshan B Sathe, Raj B Bhatt
ABSTRACTEfficient and selective sequestration of pertechnetate ions (99TcO4–) from nuclear low-level waste (LLW) solution is very much desirable for the safe treatment of radioactive liquid waste. However, the separation of specific radionuclides from competitors is a huge challenge in separation science. In the nuclear fuel cycle, 99TcO4– is one of troublesome fission products due to long half-life, large inventory in spent fuel, significant radiation hazards, and high environmental mobility of 99TcO4– ions. Recently, the metal−organic framework (MOFs) has shown significant potentials toward 99TcO4– removal. So far, most of the studies were reported using ReO4– ions, an inactive surrogate of 99TcO4– ions, and very few MOF materials are applied for real-time 99TcO4– sequestration from nuclear waste solution in the presence of extreme conditions. Herein, we report 99TcO4– ion removal from low-level liquid nuclear waste solution using zirconium-based metal−organic framework UIO-66-NH2. The material has exhibited fast kinetics and record selectivity toward 99TcO4– ions, making the adsorbent highly promising.HIGHLIGHTS Successful synthesis of zirconium-based metal−organic framework UIO-66-NH2/UIO-66-NH3+ was carried out using the solvothermal method.Characterization of zirconium-based metal−organic framework UIO-66-NH2/UIO-66-NH3+ was carried out using PXRD, SEM, EDX, and elemental analysis.An ion exchange study of 99TcO4– ions was carried out with low-level waste (LLW) solution.UIO-66-NH2/UIO-66-NH3+ has exhibited fast kinetics and record selectivity toward 99TcO4– ions with low-level waste (LLW) solution.Feasibility and selectivity study of the TcO4− extraction process with nuclear reprocessing low-level waste (LLW) solution.KEYWORDS: UiO-66-NH2/NH3+ MOFseparation99TcO4– ionsnuclear waste solution AcknowledgmentsThe authors acknowledge U. Dani, G.M, R &WM, BARC (T), Dr. H.Pal, Professor, Homi Bhabha National Institute & Former Associate Director, Chemistry Group, BARC, Mumbai, and Dr. Biswajit Sadhu, Scientific Officer, HPD, BARC, Mumbai.Disclosure statementNo potential conflict of interest was reported by the author(s).Author informationAll the authors have given permission to the final version of the manuscript.
摘要:高效、选择性地从低放射性核废料(LLW)溶液中分离高盐离子(99TcO4 -)是安全处理放射性废液的重要手段。然而,从竞争对手中分离特定的放射性核素是分离科学中的一个巨大挑战。在核燃料循环中,99TcO4 -由于半衰期长、乏燃料存量大、辐射危害大、99TcO4 -离子的环境流动性高,是一个麻烦的裂变产物。近年来,金属有机骨架(MOFs)在去除99TcO4 -方面表现出了显著的潜力。到目前为止,大多数研究都是使用ReO4 -离子作为99TcO4 -离子的非活性替代物,很少有MOF材料用于在极端条件下实时封存核废料溶液中的99TcO4 -。本文报道了利用锆基金属-有机骨架UIO-66-NH2去除低浓度液态核废料溶液中的99TcO4离子。该材料对99TcO4 -离子表现出快速的动力学和创纪录的选择性,使其具有很高的应用前景。采用溶剂热法成功合成了锆基金属-有机骨架UIO-66-NH2/UIO-66-NH3+。采用PXRD、SEM、EDX和元素分析对锆基金属-有机骨架UIO-66-NH2/UIO-66-NH3+进行了表征。用低浓度废液对99TcO4 -离子进行了离子交换研究。UIO-66-NH2/UIO-66-NH3+在低浓度废物(LLW)溶液中对99TcO4 -离子表现出快速的动力学和创纪录的选择性。核后处理低浓度废物(LLW)溶液提取TcO4−工艺的可行性和选择性研究。作者感谢U. Dani, G.M, R & wm, BARC (T), H.Pal博士,教授,Homi Bhabha国家研究所和前副主任,BARC,化学组,孟买,和Biswajit Sadhu博士,科学官员,HPD, BARC,孟买。披露声明作者未报告潜在的利益冲突。作者信息所有作者都同意稿件的最终版本。
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引用次数: 0
Improving anti-fouling properties of alumina tubular microfiltration membranes through the use of hydrophilic silica nanoparticles for oil/water separation 利用亲水二氧化硅纳米颗粒进行油水分离,提高氧化铝管状微滤膜的抗污性能
4区 工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-09-22 DOI: 10.1080/01496395.2023.2259605
Anirban Ghosh, Ghader Mahmodi, Michael Miranda, Songpei Xie, Madelyn Shaw, Mark Krzmarzick, David J. Lampert, Seok-Jhin Kim, Clint P. Aichele
ABSTRACTIn this study, hydrophilic silica nanoparticles (Si NPs) were used to modify α-alumina tubular membranes to improve their performance in terms of flux, oil rejection, and anti-fouling properties. Our work focuses on enhancing membrane performance, particularly for difficult applications such as produced water treatment. The prepared membranes were applied for oil-in-water emulsion treatment. After coating hydrophilic Si NPs, the oil contact angle improved from 133.8° to 171.4°. To prevent Si NPs from leaching off the surface of α-alumina tubular membranes, polyvinyl alcohol was used to coat the membranes as a pre-treatment step before Si NP modification. After coating the membrane with Si NPs, the roughness of the membrane surface decreased, likely leading to less fouling. After coating Si NPs, Total Organic Carbon rejection increased from 93.1% for pristine α-alumina tubular membranes to 97.7% for silica-modified membranes because of hydrophilic improvements of the modified membranes. The Si NP coating improved the anti-fouling property of membranes with the flux recovery ratio increasing from 71.3% for pristine α-alumina tubular membranes to 85.9% for silica-modified membranes. Scanning Electron Microscopy, Energy-dispersive X-ray spectroscopy, oil contact angle, and Atomic Force Microscopy characterization tests were done. The tests showed successful Si NPs impregnation and altered wettability.KEYWORDS: Oil/Water emulsionmembrane filtrationdip coatinghydrophilicitysilica modification AcknowledgmentsWe want to thank Dr. Imran Shaik for his assistance in measuring the oil contact angles.Disclosure statementNo potential conflict of interest was reported by the author(s).Statement of noveltyThe membrane development technique combines a novel pre-treatment method (using Polyvinyl alcohol) and a silica grafting technique to produce stable fumed silica coatings on membranes. After incorporating the hydrophilic Si NPs, the oil contact angle (OCA) improved from 133.8° to 171.4°. In addition, the surface roughness and associated containment traps on the membrane surface decreased, likely leading to less fouling. Total Organic Carbon (TOC) rejection increased from 93.1% for pristine α-alumina tubular membranes to 97.7% for silica-modified membranes because of hydrophilic improvements of the modified membranes. The Si NP coating improved the anti-fouling properties of membranes as evidenced by the flux recovery ratio increasing from 71.3% for pristine α-alumina tubular membranes to 85.9% for silica-modified membranes. To the best of our knowledge, there are no literature sources reporting the separation of oil and water using α-alumina membranes modified with fumed silica in a continuous cross-flow process.Additional informationFundingThe work was supported by the National Science Foundation under Grant No. OIA-1946093.
摘要:本研究采用亲水二氧化硅纳米颗粒(Si NPs)对α-氧化铝管状膜进行改性,以提高其通量、排油性能和防污性能。我们的工作重点是提高膜的性能,特别是在困难的应用,如采出水处理。将制备的膜用于水包油乳液处理。涂覆亲水Si NPs后,油接触角由133.8°提高到171.4°。为了防止Si NPs从α-氧化铝管状膜表面浸出,采用聚乙烯醇包覆α-氧化铝管状膜作为Si NP改性前的预处理步骤。在膜上涂上Si NPs后,膜表面的粗糙度降低,可能导致污染减少。涂覆硅纳米粒子后,α-氧化铝管状膜的总有机碳截留率从93.1%提高到97.7%,这是因为改性膜的亲水性得到了改善。Si NP涂层提高了膜的抗污染性能,通量回收率从原始α-氧化铝管状膜的71.3%提高到硅改性膜的85.9%。扫描电镜、能量色散x射线能谱、油接触角和原子力显微镜表征测试。试验表明,Si NPs浸渍成功,润湿性发生改变。关键词:油/水乳液膜过滤,浸渍涂层,亲水性,二氧化硅改性感谢Imran Shaik博士在测量油接触角方面的帮助。披露声明作者未报告潜在的利益冲突。该膜开发技术结合了一种新的预处理方法(使用聚乙烯醇)和二氧化硅接枝技术,在膜上产生稳定的气相二氧化硅涂层。加入亲水Si NPs后,油接触角(OCA)由133.8°提高到171.4°。此外,膜表面的表面粗糙度和相关的遏制陷阱降低,可能导致较少的污染。总有机碳(TOC)截留率由原始α-氧化铝管状膜的93.1%提高到硅改性膜的97.7%,这是因为改性膜的亲水性得到了改善。Si NP涂层改善了膜的抗污染性能,通量回收率从原始α-氧化铝管状膜的71.3%提高到硅改性膜的85.9%。据我们所知,目前还没有文献报道在连续横流过程中使用气相二氧化硅改性α-氧化铝膜分离油和水。本研究由美国国家科学基金会(nsf)资助。伊- 1946093。
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引用次数: 0
Two new ammonium-based poly(ionic liquid)s for breaking water-in-crude oil emulsions 两种新型氨基聚离子液体用于破乳原油含水
4区 工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-09-22 DOI: 10.1080/01496395.2023.2266563
Mahmood M.S. Abdullah, Hamad A. Al-Lohedan
ABSTRACTTwo new poly(ionic liquid)s (PILs) were synthesized, characterized, and applied in breaking water-in-oil (W/O) emulsions. For that, tetraethylene glycol (TG) was treated with thionyl chloride, obtaining dialkyl chloride (TC). TC was reacted with diamines 1,5-diaminopentane (AP) and 1,11-diaminoundecane (AU), forming the corresponding polyamines, TC-AP and TC-AU. Following this, TC-AP and TC-AU were quaternized with acetic acid (AA), producing poly(ionic liquid)s (PILs), TCAP-PIL, and TCAU-PIL, respectively. Chemical structures, thermal stability, surface activity, aggregation size, and zeta potential measurements were investigated using several techniques. In addition, their performance in breaking (PB) W/O emulsions in different ratios was investigated. TCAP-PIL and TCAU-PIL exhibited high PB at all ratios, while their performance improved as the crude oil ratio decreased. Moreover, TCAU-PIL showed higher PB than TCAP-PIL, which may be linked to the increased hydrophobicity of TCAU-PIL due to increased methylene units in the diamine chain compared to TCAP-PIL.KEYWORDS: Poly(ionic liquid)sdemulsificationwater-in-crude oil emulsion AcknowledgmentsThe authors acknowledge the financial support through Researchers Supporting Project number (RSPD2023R688), King Saud University, Riyadh, Saudi Arabia.Disclosure statementThe authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.Additional informationFundingThe authors acknowledge the financial support through Research Supporting Project number (RSPD2023R688), King Saud University, Riyadh, Saudi Arabia.
摘要合成了两种新型聚离子液体(pil),对其进行了表征,并将其应用于油包水(W/O)乳剂的破乳。为此,用亚硫酰氯处理四甘醇(TG),得到二烷基氯(TC)。TC与1,5-二氨基戊烷(AP)和1,11-二氨基癸烷(AU)反应,生成相应的多胺TC-AP和TC-AU。然后,将TC-AP和TC-AU与乙酸(AA)季铵化,分别制备聚离子液体(PILs)、TCAP-PIL和tcu - pil。化学结构、热稳定性、表面活性、聚集大小和zeta电位测量使用了几种技术。此外,还研究了它们在不同配比下破乳(PB) W/O乳液的性能。TCAP-PIL和tcu - pil在各配比下均表现出较高的PB,随着原油配比的降低,其性能有所提高。此外,tcu - pil比TCAP-PIL表现出更高的PB,这可能与tcu - pil比TCAP-PIL增加了二胺链上的亚甲基单位而增加了疏水性有关。作者感谢沙特阿拉伯利雅得沙特国王大学科研人员支持项目(RSPD2023R688)的资金支持。披露声明作者声明,他们没有已知的竞争经济利益或个人关系,可能会影响本文所报道的工作。作者通过沙特阿拉伯利雅得沙特国王大学的研究支持项目号(RSPD2023R688)表示感谢。
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引用次数: 0
Partitioning behavior of dyes in ionic liquids induced aqueous biphasic systems of PPG 725 & ammonium salts 离子液体诱导ppg725双水相体系中染料的分配行为铵盐
4区 工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-09-22 DOI: 10.1080/01496395.2023.2259600
Emmanuel A. Oke, Sushma P. Ijardar
ABSTRACTPolypropylene glycol (PPG) is one of the most utilized polymers in aqueous biphasic systems. The low polarity of the polymer-rich phase restricts the application of the ABSs. The applicability of polymer rich ABSs can be induced by adding little amount of ionic liquids as adjuvants. Therefore, an analysis involving the introduction of a small amount of imidazolium-based ILs to PPG 725 + ammonium salts ABSs was performed. The phase diagrams as well as the partitioning behavior of dyes: Orange II (OII), Eriochrome Black T (EBT) and Brilliant Green (BG) were investigated. The addition of 5% 1-butyl-3-methylimidazolium acetate, [BMIM][AC] modulates the partition behaviors of all the investigated dyes. The employed ILs and dyes partitioned preferentially into the polymer-rich phase. The partition coefficients (Kdye) for all the dyes follow the sequence: BG > EBT > OII in all investigated ABSs. The results obtained are in accordance with the logarithm of octanol-water partition coefficients (log Kow) of the respective dyes. The recovery of BG dye from polymer phase has been studied successfully by adsorption onto chitosan.KEYWORDS: Aqueous biphasic systemsphase behaviorammonium saltsionic liquidsdyes AcknowledgmentsEmmanuel A. Oke acknowledges the financial assistance of Africa Scholarship-MEA under the scheme of the Indian Council for Cultural Relations (2019-2020).Disclosure statementNo potential conflict of interest was reported by the author(s).Statement of noveltyThe main objective of this paper is to study the effect of addition of small amount of imidazolium based ILs on aqueous biphasic systems of PPG 725 + inorganic ammonium salts: (NH4)2CO3, NH4H2PO4, (NH4)2SO4 and (NH4)2HPO4. Many researchers conducted similar kind of work on ABS of polymer but the present work is first report on ABS of PPG 725 and ammonium salts. The obtained results shows that require comparatively less amount of ammonium salts. The partitioning of dyes: Orange II (OII), Eriochrome Black T (EBT) and Brilliant Green (BG) were investigated in theses ABSs. The addition of 1-butyl-3-methylimidazolium tetrafluoroborate, [BMIM][BF4]; 1-butyl-3-methylimidazolium acetate, [BMIM][AC]; and 1-butyl-3-methylimidazolium trifluoromethanesulfonate, [BMIM][OTF] were investigated. The present of 5% 1-butyl-3-methylimidazolium acetate, [BMIM][AC] modulates the partitioning behavior of all the investigated dyes. The employed ILs and dyes partitioned preferentially into the polymer-rich phase. [BMIM][AC] is referred as greener ILs hence the studied ABSs can serve as eco-friendly separation systems for removal of dyes.Supplementary materialSupplemental data for this article can be accessed online at https://doi.org/10.1080/01496395.2023.2259600
摘要聚丙烯乙二醇(PPG)是双水相体系中应用最广泛的聚合物之一。富聚合物相的低极性限制了abs的应用。通过添加少量离子液体作为佐剂,可以诱导富聚合物abs的适用性。因此,对PPG 725 +铵盐abs中引入少量咪唑基ILs进行了分析。研究了橙ⅱ(OII)、铬黑T (EBT)和亮绿(BG)三种染料的相图及其配分行为。添加5%的1-丁基-3-甲基咪唑醋酸酯[BMIM][AC]可调节所有染料的分配行为。所使用的il和染料优先分配到富聚合物相。所有染料的分配系数(Kdye)顺序为:BG > EBT > OII。所得结果与各染料的辛醇-水分配系数(log Kow)的对数一致。用壳聚糖吸附法成功地回收了聚合物相中的BG染料。semmanuel A. Oke感谢印度文化关系委员会(2019-2020)计划下的非洲奖学金- mea的财政援助。披露声明作者未报告潜在的利益冲突。本文的主要目的是研究添加少量咪唑基il对PPG 725 +无机铵盐(NH4)2CO3、NH4H2PO4、(NH4)2SO4和(NH4)2HPO4双水相体系的影响。许多研究人员对聚合物的ABS进行了类似的研究,但本文首次报道了ppg725和铵盐的ABS。所得结果表明,该工艺所需的铵盐相对较少。研究了染料的分配:橙ⅱ(OII)、铬黑T (EBT)和亮绿(BG)。1-丁基-3-甲基咪唑四氟硼酸盐[BMIM][BF4]的加成醋酸1-丁基-3-甲基咪唑[BMIM][AC];和1-丁基-3-甲基咪唑三氟甲烷磺酸盐[BMIM][OTF]进行了研究。5% 1-丁基-3-甲基咪唑醋酸酯[BMIM][AC]的存在调节了所研究染料的分配行为。所使用的il和染料优先分配到富聚合物相。[BMIM][AC]被称为绿色ILs,因此所研究的abs可以作为去除染料的环保分离系统。补充材料本文的补充数据可在https://doi.org/10.1080/01496395.2023.2259600上在线获取
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引用次数: 0
Low temperature hydrothermal processing to recover aluminum from nepheline syenite roast-leach residue 低温水热法回收霞石正长岩烤浸渣中的铝
4区 工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-09-22 DOI: 10.1080/01496395.2023.2260084
Jayashree Samantray, Amit Anand, Barsha Dash, Malay K. Ghosh
ABSTRACTNepheline syenite is primarily an alumino-silicate rock which contains a major amount of potassium and aluminum. After potassium recovery through chloridizing roasting followed by water leaching method, the roast leach residue of nepheline syenite was considered for the aluminum extraction process due to its ample aluminum content. Sulfuric acid is chosen over other acids as it prevents the leaching of calcium. A 2^3 full factorial design was employed to study the effects of acid concentration, time, and temperature. Furthermore, to enhance the recovery and to forbid the leaching of silicon, autoclave leaching was preferred.Iron is generally leached with aluminum in the acid leaching process which could be removed effectively by pH adjustment. The leached liquor obtained after purification is evaporated by using a hot water bath. The liquor concentrated on slow evaporation to a point where aluminum sulfate started precipitating. Then, the concentrated liquor was kept overnight at 8°C in a cooling incubator. Aluminum sulfate was produced with 99.80% purity.KEYWORDS: Nepheline syenitealuminumhydrothermal process, aluminum sulfate AcknowledgmentsThe authors also appreciatively recognize the technical assistance provided by the institute staff for the characterization studies. One of the authors (JS) expresses her gratitude to CSIR for providing the fellowship under XII plan period projects.Disclosure statementNo potential conflict of interest was reported by the author(s).Statement of noveltyThe residues obtained after potassium recovery by chloridizing roasting followed by water leaching of silicate minerals and rocks such as feldspar, nepheline syenite etc. are rich in silicon, aluminum, calcium, and iron due to which these can be utilized in various ways. Hence, processing of these residues would be a value addition to the potassium recovery process by increasing the number of products.In our present work, we have tried to recover aluminum from the roast leach residue of nepheline syenite containing 21.43% aluminum as its oxide employing the acid leaching method. Among various acids, leaching with sulfuric acid was better for downstream processing for aluminum recovery. Three parameters chosen for a two[Citation3] full factorial design were time, temperature, and acid concentration. The leaching extent obtained at the design conditions was fed to Minitab 17, and regression equations were generated. Furthermore, to enhance the recovery and to forbid the leaching of silicon, model equations were utilized for autoclave leaching. As the liquor constitutes iron along with aluminum, hence it was removed by pH adjustment to get aluminum-rich liquor which was further processed to get aluminum sulfate crystals.
摘要霞石正长岩主要是含钾、铝的铝硅酸盐岩。采用氯化焙烧法回收钾后再进行水浸,考虑霞石正长岩的焙烧浸出渣含铝量较大,可用于提铝工艺。选择硫酸而不是其他酸是因为它能防止钙的浸出。采用2^3全因子设计研究酸浓度、时间和温度的影响。此外,为了提高回收率和防止硅的浸出,首选蒸釜浸出。在酸浸过程中,铁通常与铝一起浸出,通过调整pH值可以有效地去除铁。提纯后得到的浸出液用热水浴蒸发。液体集中缓慢蒸发,直至硫酸铝开始沉淀。然后,将浓缩后的液体在8°C的冷却培养箱中保存过夜。生产的硫酸铝纯度为99.80%。关键词:霞石正长岩;水热法;硫酸铝。其中一位作者(JS)对CSIR在第十二计划期项目中提供奖学金表示感谢。披露声明作者未报告潜在的利益冲突。通过氯化焙烧回收钾,然后对硅酸盐矿物和岩石(如长石、霞石正长岩等)进行水浸得到的残留物富含硅、铝、钙和铁,因此可以以各种方式加以利用。因此,通过增加产品的数量,这些残留物的处理将是钾回收过程的一个附加价值。本文尝试用酸浸法从含铝21.43%的霞石正长岩焙烧浸渣中回收铝。在各种酸中,硫酸浸出对铝的下游处理效果较好。为两个[Citation3]全因子设计选择的三个参数是时间、温度和酸浓度。将设计条件下得到的浸出程度输入Minitab 17,生成回归方程。此外,为了提高回收率和防止硅的浸出,采用模型方程进行蒸釜浸出。由于液中含有铁和铝,因此通过调整pH除去,得到富铝液,进一步处理得到硫酸铝结晶。
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引用次数: 0
Understanding the sorption behavior of tri, tetra and hexavalent f cations on metal–organic framework (MOF), ZIF-67: experimental and theoretical investigation 了解三、四、六价官能团在金属-有机骨架(MOF) ZIF-67上的吸附行为:实验和理论研究
4区 工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-09-21 DOI: 10.1080/01496395.2023.2255740
J. Mor, Anil Boda, S. K. Sharma, Musharaf Ali, Arijit Sengupta
ABSTRACTMetal–organic frameworks (MOFs) are a class of compounds with modern-age technological importance due to diverse structural topologies, porosity, and modularity. ZIF-67 has been synthesized for efficient extraction of f cations in different oxidation states (UO22+, Th4+ and Eu3+) from aqueous pH medium exhibiting the trend in sorption efficiency as: KdTh(6.19 × 103) > KdU (5.20 × 103) > KdEu (1.58 × 103) in accordance to their chemical potential. Langmuir isotherm was found to be predominate with sorption capacity 85.9 mg g−1, 137.4 mg g−1 and 50.6 mg g−1 for U, Th and Eu, respectively. The sorption predominantly proceeded via pseudo 2nd order rate kinetics with rate constants: k2U ~0.089 g mg−1 min−1, k2Th ~0.011 g mg−1 min−1 and k2Eu ~0.04 g mg−1 min−1. The processes were found to be spontaneous as revealed from negative ΔG values; and endothermic in nature (ΔHU ~10.5 kJ mol−1; ΔHTh ~12.8 kJ mol−1; ΔHEu ~8.3 kJ mol−1). The sorption proceeded via the formation of an inner sphere complex as indicated from their enhancement in the entropy values on sorption due to the release of water molecules. The Density Functional Theory (DFT) predicted selectivity using binding energy (ZIF-67-Eu3+ ~ -60.90 eV, ZIF-67-Th4+ ~ -70.78 eV, ZIF-67-Th4+ ~ -69.52 eV) is in line with the experimental selectivity of Th4+ > UO22+ > Eu3+. Total density of states (TODS) and Projected density of States (PODS) were estimated in order to understand the interaction between the ZIF-67 and f cations.KEYWORDS: ZIF-67f-cationssorptionisothermradiolytic stability AcknowledgmentsThe authors wish to acknowledge Dr. P. K. Mohapatra, Associate Director, RC & I Group, BARC & Head, Radiochemistry Division.Disclosure statementNo potential conflict of interest was reported by the author(s).Metal-Organic Framework noveltyMetal-Organic Framework (MOF), ZIF-67 has been synthesized for efficient extraction of f-cations in different oxidation states (UO22+, Th4+ and Eu3+) from aqueous pH medium exhibiting the trend in sorption efficiency as: KdTh (6.19 × 103) > KdU (5.20 × 103) > KdEu (1.58 × 103) in accordance to their chemical potential. Langmuir isotherm was found to be predominate with sorption capacity 85.9 mg g−1, 137.4 mg g−1 and 50.6 mg g−1 for U, Th and Eu, respectively. The sorption predominantly proceeded via pseudo 2nd order rate kinetics with rate constants: k2U ~0.089 g mg−1 min−1, k2Th ~0.011 g mg−1 min−1 and k2Eu ~0.04 g mg−1 min−1. The processes were found to be spontaneous as revealed from negative ΔG values, and endothermic in nature (ΔHU ~10.5 kJ mol−1; ΔHTh ~12.8 kJ mol−1 ΔHEu ~8.3 kJ mol−1). The sorption proceeded via the formation of an inner sphere complex as indicated from their enhancement in the entropy values on sorption due to the release of water molecules. The Density Functional Theory (DFT) predicted selectivity using B.E. (ZIF-67-Eu3+ ~ −60.90 eV, ZIF-67-Th4+ ~ −70.78 eV, ZIF-67-Th4+ ~ −69.52 eV) is in line with the experimental selectivity of Th4+ > UO
摘要金属有机骨架(MOFs)是一类具有不同结构拓扑、孔隙度和模块化的现代技术重要性的化合物。合成的ZIF-67对不同氧化态(UO22+、Th4+和Eu3+)的pH水溶液的吸附效率表现为:KdTh(6.19 × 103) > KdU (5.20 × 103) > KdEu (1.58 × 103)。Langmuir等温线对U、Th和Eu的吸附量分别为85.9 mg g−1、137.4 mg g−1和50.6 mg g−1。k2U ~0.089 g mg−1 min−1,k2Th ~0.011 g mg−1 min−1,k2Eu ~0.04 g mg−1 min−1。从负ΔG值可以看出,这些过程是自发的;和吸热性质(ΔHU ~10.5 kJ mol−1;ΔHTh ~12.8 kJ mol−1;ΔHEu ~8.3 kJ mol−1)。由于水分子的释放,吸附的熵值增加,表明吸附是通过形成内球络合物进行的。密度泛函理论(DFT)利用结合能预测的选择性(ZIF-67-Eu3+ ~ -60.90 eV, ZIF-67-Th4+ ~ -70.78 eV, ZIF-67-Th4+ ~ -69.52 eV)符合Th4+ > UO22+ > Eu3+的实验选择性。为了了解ZIF-67与阳离子之间的相互作用,估计了总态密度(TODS)和投影态密度(PODS)。作者要感谢Dr. P. K. Mohapatra, BARC, RC & I组副主任,放射化学部主任。披露声明作者未报告潜在的利益冲突。新型金属-有机骨架合成了金属-有机骨架(MOF) ZIF-67,用于从pH水溶液中高效萃取不同氧化态的f-阳离子(UO22+、Th4+和Eu3+),其吸附效率根据其化学势表现为:KdTh (6.19 × 103) > KdU (5.20 × 103) > KdEu (1.58 × 103)。Langmuir等温线对U、Th和Eu的吸附量分别为85.9 mg g−1、137.4 mg g−1和50.6 mg g−1。k2U ~0.089 g mg−1 min−1,k2Th ~0.011 g mg−1 min−1,k2Eu ~0.04 g mg−1 min−1。从负ΔG值可以看出,该过程是自发的,本质上是吸热的(ΔHU ~10.5 kJ mol−1;ΔHTh ~12.8 kJ mol−1 ΔHEu ~8.3 kJ mol−1)。由于水分子的释放,吸附的熵值增加,表明吸附是通过形成内球络合物进行的。密度泛函理论(DFT)用B.E.预测的选择性(ZIF-67-Eu3+ ~−60.90 eV, ZIF-67-Th4+ ~−70.78 eV, ZIF-67-Th4+ ~−69.52 eV)符合Th4+ > UO22+ > Eu3+的实验选择性。为了了解ZIF-67与f-阳离子之间的相互作用,我们估计了总态密度(TODS)和投射态密度(PODS)。
{"title":"Understanding the sorption behavior of tri, tetra and hexavalent f cations on metal–organic framework (MOF), ZIF-67: experimental and theoretical investigation","authors":"J. Mor, Anil Boda, S. K. Sharma, Musharaf Ali, Arijit Sengupta","doi":"10.1080/01496395.2023.2255740","DOIUrl":"https://doi.org/10.1080/01496395.2023.2255740","url":null,"abstract":"ABSTRACTMetal–organic frameworks (MOFs) are a class of compounds with modern-age technological importance due to diverse structural topologies, porosity, and modularity. ZIF-67 has been synthesized for efficient extraction of f cations in different oxidation states (UO22+, Th4+ and Eu3+) from aqueous pH medium exhibiting the trend in sorption efficiency as: KdTh(6.19 × 103) &gt; KdU (5.20 × 103) &gt; KdEu (1.58 × 103) in accordance to their chemical potential. Langmuir isotherm was found to be predominate with sorption capacity 85.9 mg g−1, 137.4 mg g−1 and 50.6 mg g−1 for U, Th and Eu, respectively. The sorption predominantly proceeded via pseudo 2nd order rate kinetics with rate constants: k2U ~0.089 g mg−1 min−1, k2Th ~0.011 g mg−1 min−1 and k2Eu ~0.04 g mg−1 min−1. The processes were found to be spontaneous as revealed from negative ΔG values; and endothermic in nature (ΔHU ~10.5 kJ mol−1; ΔHTh ~12.8 kJ mol−1; ΔHEu ~8.3 kJ mol−1). The sorption proceeded via the formation of an inner sphere complex as indicated from their enhancement in the entropy values on sorption due to the release of water molecules. The Density Functional Theory (DFT) predicted selectivity using binding energy (ZIF-67-Eu3+ ~ -60.90 eV, ZIF-67-Th4+ ~ -70.78 eV, ZIF-67-Th4+ ~ -69.52 eV) is in line with the experimental selectivity of Th4+ &gt; UO22+ &gt; Eu3+. Total density of states (TODS) and Projected density of States (PODS) were estimated in order to understand the interaction between the ZIF-67 and f cations.KEYWORDS: ZIF-67f-cationssorptionisothermradiolytic stability AcknowledgmentsThe authors wish to acknowledge Dr. P. K. Mohapatra, Associate Director, RC & I Group, BARC & Head, Radiochemistry Division.Disclosure statementNo potential conflict of interest was reported by the author(s).Metal-Organic Framework noveltyMetal-Organic Framework (MOF), ZIF-67 has been synthesized for efficient extraction of f-cations in different oxidation states (UO22+, Th4+ and Eu3+) from aqueous pH medium exhibiting the trend in sorption efficiency as: KdTh (6.19 × 103) &gt; KdU (5.20 × 103) &gt; KdEu (1.58 × 103) in accordance to their chemical potential. Langmuir isotherm was found to be predominate with sorption capacity 85.9 mg g−1, 137.4 mg g−1 and 50.6 mg g−1 for U, Th and Eu, respectively. The sorption predominantly proceeded via pseudo 2nd order rate kinetics with rate constants: k2U ~0.089 g mg−1 min−1, k2Th ~0.011 g mg−1 min−1 and k2Eu ~0.04 g mg−1 min−1. The processes were found to be spontaneous as revealed from negative ΔG values, and endothermic in nature (ΔHU ~10.5 kJ mol−1; ΔHTh ~12.8 kJ mol−1 ΔHEu ~8.3 kJ mol−1). The sorption proceeded via the formation of an inner sphere complex as indicated from their enhancement in the entropy values on sorption due to the release of water molecules. The Density Functional Theory (DFT) predicted selectivity using B.E. (ZIF-67-Eu3+ ~ −60.90 eV, ZIF-67-Th4+ ~ −70.78 eV, ZIF-67-Th4+ ~ −69.52 eV) is in line with the experimental selectivity of Th4+ &gt; UO","PeriodicalId":21680,"journal":{"name":"Separation Science and Technology","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136235236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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Separation Science and Technology
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