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Synthesis and application of biocompatible nontoxic nanoparticles for reclamation of Ce^3＋ from synthetic wastewater： Toxicity assessment, kinetic, isotherm and thermodynamic study

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Journal of Rare Earths 2018年第9期36卷 994-1006页

作者： Varsha Srivastava Sidra Iftekhar ZhaoWang Indu Babu Mika sillanpaa Laboratory of Green Chemistry School of Engineering Science Lappeenranta University of Technology Sammonkatu 12 FI-50130 Mikkeli Finland Department of Civil and Environmental Engineering Florida International University Miami EL 33174 USA

The aim of present study is to synthesize forsterite nanoparticles（FRST） for the reclamation of cerium ions（Ce3＋） from synthetic *** aim to synthesize FRST nanoparticles is due to its biocompatible and nontoxic *** formation of nanoparticles with average diameter of 58 nm was confirmed by TEM *** images of bare FRST nanoparticles show a heterogeneous surface with porous *** surface area of FRST nanoparticles is calculated to be 33.69 m2/*** significant uptake of Ce3＋ ions can be obtained for all the selected concentrations（25-150 mg/L） within 2 h of adsorbent—adsorbate *** pH study shows that by increasing pH from acidic to alkaline range,higher removal can be *** study demonstrates the endothermic nature of Ce3＋*** value of sticking probability suggests very high sticking probability of Ce3＋ ion for FRST ***3＋ uptake is favored by higher temperature and with the increase in temperature from298 to 328 K,Langmuir adsorption capacity increases from 36.45 to 42.99 m2/*** of FRST nanoparticles was also investigated for other light and heavy rare earth elements in single solute and multisolute systems,FRST nanoparticles show the significant removal of divalent metallic pollutants as *** assessment of chemical toxicity of treated wastewater was carried out with the bioluminescent photobacterium（Vibrio fischeri） and decreased toxicity was observed in treated water *** outcome of present study suggests that the FRST nanoparticles can be efficiently utilized for the removal of Ce3＋ ions and a wide range of other pollutant species as well.

关键词： Forsterite Rare earth elements Isotherm model Cerium Metallic pollutants

Export of dissolved carbonaceous and nitrogenous substances in rivers of the “Water Tower of Asia”

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Journal of Environmental Sciences 2018年第3期30卷 53-61页

作者： Bin Qu Mika sillanpaa Shichang Kang Fangping Yan Zhiguo Li Hongbo Zhang Chaoliu Li Laboratory of Green Chemistry Lappeenranta University of Technology Mikkeli 50130 Finland Key Laboratory of Tibetan Enuironment Changes and Land Surface Processes Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100101 China State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou Gansu 730000 China Shangqiu Normal University Shangqiu He'nan 476000 China CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing 100085 China

Rivers are critical links in the carbon and nitrogen cycle in aquatic,terrestrial,and atmospheric *** riverine carbon and nitrogen exports in nine large rivers on the Tibetan Plateau—the＂Water Tower of Asia＂—were investigated in the monsoon season from 2013 to *** with the world average,concentrations of dissolved inorganic carbon（DIC,30.7 mg/L）were high in river basins of the plateau due to extensive topographic relief and intensive water *** concentrations of dissolved organic carbon（DOC,1.16 mg/L）were likely due to the low temperature and unproductive land vegetation *** concentrations of riverine DIN（0.32 mg/L）and DON（0.35 mg/L）on the Tibetan Plateau were close to the world ***,despite its predominantly pristine environment,discharge from agricultural activities and urban areas of the plateau has raised riverine N *** addition,DOC/DON ratio（C/N,~6.5）in rivers of the Tibetan Plateau was much lower than the global average,indicating that dissolved organic carbon in the rivers of this region might be more ***,along with global warming and anthropogenic activities,increasing export of bioavailable riverine carbon and nitrogen from rivers of the Tibetan Plateau can be expected in the future,which will possibly influence the regional carbon and nitrogen cycle.

关键词： Dissolved carbon Dissolved nitrogen Rivers The Tibetan Plateau

Trace elements and rare earth elements in wet deposition of Lijiang,*** region,southeastern edge of the Tibetan Plateau

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Journal of Environmental Sciences 2017年第2期29卷 18-28页

作者： Junming Guo Shichang Kang Jie Huang Mika sillanpaa Hewen Niu Xuejun Sun Yuanqing He Shijing Wang Lekhendra Tripathee Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of Sciences(CAS)Beijing 100101China State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering of Research InstituteCASLanzhou 730000China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing100101China Laboratory of Green Chemistry Lappeenranta Uniuersity of TechnologyMikkeli 50130Finland University of Chinese Academy of Sciences Beijing 100049China

In order to investigate the compositions and wet deposition fluxes of trace elements and rare earth elements（REEs） in the precipitation of the southeastern edge of the Tibetan Plateau, 38 precipitation samples were collected from March to August in 2012 in an urban site of Lijiang city in the Mt. Yulong region. The concentrations of most trace elements and REEs were higher during the non-monsoon season than during the monsoon season,indicating that the lower concentrations of trace elements and REEs observed during monsoon had been influenced by the dilution effect of increased precipitation. The concentrations of trace elements in the precipitation of Lijiang city were slightly higher than those observed in remote sites of the Tibetan Plateau but much lower than those observed in the metropolises of China, indicating that the atmospheric environment of Lijiang city was less influenced by anthropogenic emissions, and, as a consequence, the air quality was still relatively good. However, the results of enrichment factor and principal component analysis revealed that some anthropogenic activities（e.g., the increasing traffic emissions from the rapid development of tourism） were most likely important contributors to trace elements, while the regional/local crustal sources rather than anthropogenic activities were the predominant contributors to the REEs in the wet deposition of Lijiang city. Our study was relevant not only for assessing the current status of the atmospheric environment in the Mt. Yulong region, but also for specific management actions to be implemented for the control of atmospheric inputs and the health of the environment for the future.

关键词： Trace elements Rare earth elements Wet deposition Seasonal variation Lijiang city Tibetan Plateau

Computational and Experimental Approaches for Evaluating Dose under a Block in TBI Geometry

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2022年第1期11卷 77-83页

作者： Laura Russell Jussi sillanpaa Department of Medical Physics Memorial Sloan-Kettering Cancer Center New York USA

Total Body Irradiation (TBI) patients are often treated at extended distances of several meters, with blocking made from high-Z materials placed close to the patients’ skin. Evaluating the dose under a block (e.g., for implanted medical device shielding purposes) in such a geometry is challenging. We compare the performance of two commonly used dose calculation algorithms, Anisotropic Analytical Algorithm (AAA) and Acuros XB, with Optically Stimulated Lumine- scence (OSLD) and ion chamber measurements in phantoms. The calculations and phantom measurements are also compared with in-vivo OSLD measure- ments. We find that OSLD and ion chamber measurements in phantom are good predictors of in-vivo measurements, while both AAA and Acuros XB sys- tematically overestimate the block transmission. We found Acuros XB to be accurate enough for a rough upper estimate (dose under block overestimated by 7% - 22%), while for AAA the overestimate was more severe (90% - 110%);the reason is that AAA does not account for the increase in pair production cro- ss-section in high-Z materials.

关键词： Total Body Irradiation AAA Acuros XB ICD Dose under Block

制备条件对稀土掺杂TiO_2物理性质和光催化降解吡唑草胺性能的影响（英文）

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催化学报 2015年第10期36卷 1679-1685页

作者： Marcela Kralova Irina Levchuk Vit Kasparek Mika sillanpaa Jaroslav Cihlar 布尔诺理工大学中欧科技学院拉普兰塔理工大学绿色化学实验室

多相光催化是一种非常有效的降解各种水污染物的方法.本文以稀土(镝和镨)掺杂的TiO2为光催化剂,考察了制备条件对其物理性质和光催化性能的影响.采用溶胶-凝胶法和不同条件(反应温度450,550,650 oC;反应时间4,8,12 h)的固态反应法制备了... 详细信息

多相光催化是一种非常有效的降解各种水污染物的方法.本文以稀土(镝和镨)掺杂的TiO2为光催化剂,考察了制备条件对其物理性质和光催化性能的影响.采用溶胶-凝胶法和不同条件(反应温度450,550,650 oC;反应时间4,8,12 h)的固态反应法制备了TiO2样品.运用X射线衍射分析了该样品的晶相,发现只存在锐钛矿相,并得到Raman光谱的证实.同时采用扫描电镜观察了样品的结构和粒径;以BET法计算了其比表面积;运用紫外-可见光漫反射光谱测得了样品的带隙能量.通过测量紫外光照射下常用除草剂吡唑草胺的降解速率评价了样品的光催化活性,反应过程中吡唑草胺的浓度用高效液相色谱分析.结果表明,稀土掺杂使得TiO2吸收边红移,并提高了其光催化活性;制备时最优的固态反应条件为550 oC反应8 h.

关键词：稀土掺杂二氧化钛镝镨合成条件光催化降解吡唑草胺

Synthesis of novel adsorbent by intercalation of biopolymer in LDH for the removal of arsenic from synthetic and natural water

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Journal of Environmental Sciences 2020年第5期32卷 246-261页

作者： Hanen Bessaies Sidra Iftekhar Bhairavi Doshi Jamel Kheriji Mohamed Chaker Ncibi Varsha Srivastava Mika sillanpaa Bechir Hamrouni Laboratory of Desalination and Water Treatement LR19ES01 Faculty of Sciences of TunisTunis El Manar University2092El Manar ITunisia Department of Separation Science Lappeenranta-Lahti University of Technology(LUT)Sammonfeatu 12FI-50130MikkeliFinland International Water Research Institute MohammedⅥPolytechnic UniversityCity Ben Guerir 43150Morocco Department of Civil and Environmental Engineering Florida International UniversityMiamiFL 33174USA Department of Environmental Engineering University of Engineering and TechnologyTaxilaPakistan

This study focuses on the synthesis of nanocomposites named CCA and CZA that were prepared by the incorporation of cellulose(CL)in the Ca/Al and Zn/Al layered double hydroxide(LDH),*** materials were then used for the uptake of As(Ⅲ)and As(V)from aqueous *** of both nanocomposites(CCA and CZA)was done using FTIR and Raman analysis to identify the functional groups,N2 adsorption-desorption isotherms to determine the specific surface area and pore geometry and XPS analysis to obtain the surface atomic *** other characters were investigated using simultaneous TGA and DTA and elemental chemical analysis(CHNS/O).The crystallinity of the prepared nanocomposites was displayed by XRD ***,the sheet-like structure of the LDHs and the irregularity of surface morphology with porous structure were observed by TEM and SEM *** of maximum adsorption capacity was adjusted using different parameters including pH,contact time and adsorbent *** pseudo-second-order model was in good fitting with kinetics *** adsorption isotherm results showed that CZA exhibits better adsorption capacity for As(Ⅲ)than CCA and the Langmuir isotherm model described the data well for both *** studies illustrated the endothermic nature of CCA and exothermic nature on CZA,as well as the fact that the adsorption process is spontaneous.A real water sample collected from well located in Gabes(Tunisia),has also been *** obtained experimental results were confirmed that these sorbents are efficient for the treatment of hazardous toxic species such as.

关键词： Layered double hydroxide Adsorption Arsenic removal Kinetics Natural water treatment

Estimating interaction between surface water and groundwater in a permafrost region of the northern Tibetan Plateau using heat tracing method

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Research in Cold and Arid Regions 2020年第2期12卷 71-82页

作者： TanGuang Gao Jie Liu TingJun Zhang ShiChang Kang ChuanKun Liu ShuFa Wang Mika sillanpaa YuLan Zhang Key Laboratory of Western China's Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhouGansu 730000China Institute of Water Sciences College of EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China Department of Civil and Environmental Engineering Florida International University Miami FL 33199USA

Understanding the interaction between groundwater and surface water in permafrost regions is essential to study flood frequencies and river water quality, especially in the high latitude/altitude basins. The application of heat tracing method,based on oscillating streambed temperature signals, is a promising geophysical method for identifying and quantifying the interaction between groundwater and surface water. Analytical analysis based on a one-dimensional convective-conductive heat transport equation combined with the fiber-optic distributed temperature sensing method was applied on a streambed of a mountainous permafrost region in the Yeniugou Basin, located in the upper Heihe River on the northern Tibetan Plateau. The results indicated that low connectivity existed between the stream and groundwater in permafrost *** interaction between surface water and groundwater increased with the thawing of the active layer. This study demonstrates that the heat tracing method can be applied to study surface water-groundwater interaction over temporal and spatial scales in permafrost regions.

关键词： surface water groundwater permafrost heat tracing method Tibetan Plateau

Kinetic Modeling of the Photocatalytic Reduction of Cr（VI） in the Presence of Dye Using Composite Photocatalyst

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Journal of Chemistry and Chemical Engineering 2014年第9期8卷 918-924页

作者： Kwena Yvonne Pete Maurice Stephen Onyango Mika sillanpaa Aoyi Ochieng Centre for Renewable Energy and Water Vaal University of Technology Vandebijlpark 1900 South Africa Department of Chemical and Metallurgical Engineering Tshwane University of Technology Pretoria 0001 South Africa Laboratory of Green Chemistry Lappeenranta University of Technology Mikkeli FI-50100 Finland

The photocatalytic properties of surface TiO2 supported zeolite in a semi batch reactor for the reduction of Cr（VI） in the presence of methyl orange dye were investigated. The prepared composite photocatalyst was characterized by SEM-EDS （scanning electron microscopy and energy dispersive spectroscopy）. The effects of operating parameters such as the pH and concentration of Cr（VI） in the absence and presence of dye were evaluated. The Cr（VI） reduction was more efficient in the ternary system （Cr（VI）/dye/TiO2-zeolite） than that of the corresponding binary system （Cr（VI）/TiO2-zeolite）. The extent of metal reduction after 210 min of irradiation was 68% at pH = 3 for the ternary system. In order to optimize the effectiveness of the composite photocatalyst on the photocatalytic reduction of Cr（VI）, kinetics and isotherm models were applied. The kinetics of Cr（VI） in the presence of dye on TiO2/zeolite composite photocatalyst followed the pseudo-first-order model while the equilibrium data correlated reasonably well with Freundlich isotherm.

关键词： Composite photocatalyst Cr(VI) dye kinetics isotherm.