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Removal of elemental mercury by iodine-modified rice husk ash sorbents

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Journal of Environmental Sciences 2010年第10期22卷 1629-1636页

作者： Pengfei Zhao,Xin Guoff,Chuguang Zheng State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China State Key Laboratory of Coal Combustion Huazhong University of Science and Technology

Iodine-modified calcium-based rice husk ash sorbents （I2/CaO/RHA） were synthesized and characterized by X-ray diffraction, X-ray fluorescence, and N2 isotherm adsorption/desorption. Adsorption experiments of vapor-phase elemental mercury （Hg^0） were performed in a laboratory-scale fixed-bed reactor. I2/CaO/RHA performances on Hg^0 adsorption were compared with those of modified Cabased fly ash sorbents （I2/CaO/FA） and modified fly ash sorbents （I2/FA）. Effects of oxidant loading, supports, pore size distribution, iodine impregnation modes, and temperature were investigated as well to understand the mechanism in capturing Hg^0. The modified sorbents exhibited reasonable efficiency for Hg^0 removal under simulated flue gas. The surface area, pore size distribution, and iodine impregnation modes of the sorbents did not produce a strong effect on Hg^0 capture efficiency, while fair correlation was observed between Hg^0 uptake capacity and iodine concentration. Therefore, the content of 12 impregnated on the sorbents was identified as the most important factor influencing the capacity of these sorbents for Hg^0 uptake. Increasing temperature in the range of 80-140℃ caused a rise in Hg^0 removal. A reaction mechanism that may explain the experimental results was presumed based on the characterizations and adsorption study.

关键词： mercury sorbents fly ash rice husk ash iodine impregnation

Adsorption of Metal Ions by sorbents Composed of Marine Alga Saccharina bongardiana and Poriferous Aluminosilicates

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Journal of Environmental Science and Engineering(A) 2012年第4期1卷 514-521页

作者： Tatyana P. Belova Olga N. Selivanova Research Geotechnological Center Far Eastern Division Russian Academy of Sciences Petropavlovsk-Kamchatskii 683002Russia Kamchaka Branch of Pacific Geographical Institute Far Eastern Division Russian Academy of SciencesPetropavlovsk-Kamchatskii 683000 Russia

The development of gold and cobalt-copper-nickel deposits in Kamchatka threatens the loss of biodiversity in spawning rivers and lakes and has negative effects on coastal ecosystems. To reduce pollution by mining wastes, filters with dried marine alga Saccharina bongardiana in combination with zeolite and pumice are recommended. Combined Saccharina-based sorbents remove heavy metal ions more effectively, increasing adsorption capacity by five times compared to mineral （pumice） sorhents. As a result of desorption, a tenfold increase of the solution concentration is reached after the first sorption cycle. Valuable elements （Ni, Co, Cu etc.） can then be extracted from concentrates by any known method. It increases economic efficiency of the mining industry due to recycling of non-ferrous metals. Saccharina-based sorbents can be also utilized for purification of polluted natural waters. It may serve as environmental protection measure and provide for ecological safety of the unique natural environment of Kamchatka and its bioresources.

关键词： sorbents zeolite pumice Saccharina bongardiana mining industry environmental protection.

Clay sorbents in the Area of the Most and Sokolov Basins as a Possible Use in Agriculture Reclamations

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Agricultural Sciences 2018年第12期9卷 1621-1628页

作者： Petr Vráblík Michal Rehor Pavel Schmidt Jaroslava Vráblíková Eliska Wildová Department of Natural Sciences Faculty of Environment J. E. Purkyně University in ústí nad Labem ústí nad Labem Czech Republic Research Institute for Brown Coal in Most Most Czech Republic

This paper is devoted to the possibilities of the reclamation use of claystone sorbents of the Most and Sokolov basins. The properties of phytotoxic areas suitable for the application of sorbents, the locality, and parameters of the main clay sorbents of both brown coal basins are briefly summarized in the paper. Clay sorbents are suitable for the reclamation of phytotoxic surfaces contaminated by coal. This paper provides a brief evaluation of the properties of the claystone sorbents of the North Bohemian and Sokolov basins. In the region of the North Bohemian brown coal basin, potential sorbents can be used for the reclamation works.

关键词： sorbents Pedological Parameters Reclamation Contamination

Combination of sorbents and Modification of Its Constituents to Enhance the Mopping Ability of Chemically Modified and Unmodified Biological Wastes on Crude Oil and Its Lower Fractions

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Advances in Materials Physics and Chemistry 2012年第3期2卷 126-148页

作者： John Kanayochukwu Nduka Environmental Chemistry and Toxicology Research Unit Pure and Industrial Chemistry Department Nnamdi Azikiwe University Awk Nigeria

Protein wastes (feathers, goat hair) and cellulosic wastes (corn cob, coconut husks) were collected, washed with detergent solution, thoroughly rinsed and sun dried for 2 days before drying in an oven and then ground, half of ground material was carbonized at a maximum temperature of 500?C after mixing with *** carbonized parts were pulverized;both carbonized and uncarbonized sorbents were sieved into two particle sizes of 325 μm and 625 μm using mechanical sieve.1.5 g protein wastes and cellulosic wastes were each used to mop up spilled crude oil, diesel, kerosene and petrol (separately before combining) by encasing them in a sac like boom of 2cm x 2cm x 1cm dimension so as to determine the efficacy of waste sorbents in cleaning hydrocarbon spills. Results of Tables 1(a)-4(a), 1(b)-4(b) and 5-8 shows that the sorbents mopped, desorbed and retained an average of more than 500%, 350% and 300% of their weight of the hydrocarbon sorbates within average of 90 mins contact time, the volume of sorbates mopped up increased significantly when equal weight of activated and unactivated sorbents were combined, the results of equal combination of activated and unactivated sorbents at each particle size and contact time were compared with that of calculated values, high percentage retention observed were a function of mechanism of absorption/adsorption. Each sorbent have a distinct feature that enhances its mopping ability. Large volumes of the hydrocarbon liquids were recovered by mere pressing, the sorbates were mopped up in the order;crude oil > diesel > kerosene > petrol. Protein sorbents with oleophilic and aqua phobic properties absorbed more of all the hydrocarbon liquids than cellulosic sorbents at any particle size and contact, the later tend to be more abundant and therefore cost effective;it was observed that both carbonized and uncarbonized sorbents are good hydrocarbon mops and therefore good alternative to synthetic polyurethane foam already in use. Combinati

关键词： Sorbent-Sorbate System sorbents Combination Experimental and Calculated Value Adsorption/Absorption Contact Time Re-Use

Zeolites for the separation of ethylene, ethane, and ethyne

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FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING 2024年第9期18卷 108-0页

作者： Wang, Binyu Li, Qiang Zhang, Haoyang Zhang, Jia-Nan Pan, Qinhe Yan, Wenfu Jilin Univ Coll Chem State Key Lab Inorgan Synth & Preparat Chem Changchun 130012 Peoples R China Zhengzhou Univ Coll Mat Sci & Engn Key Lab Adv Energy Catalyt & Funct Mat Preparat Zhengzhou 450012 Peoples R China Hainan Univ Sch Chem & Chem Engn Key Lab Adv Mat Trop Isl Resources Minist Educ Haikou 570228 Peoples R China

The cost-effective separation of ethylene (C2H4), ethyne (C2H2), and ethane (C2H6) poses a significant challenge in the contemporary chemical industry. In contrast to the energy-intensive high-pressure cryogenic distillation process, zeolite-based adsorptive separation offers a low-energy alternative. This review provides a concise overview of recent advancements in the adsorptive separation of C2H4, C2H2, and C2H6 using zeolites or zeolite-based adsorbents. It commences with an examination of the industrial significance of these compounds and the associated separation challenges. Subsequently, it systematically examines the utilization of various types of zeolites with diverse cationic species in such separation processes. And then it explores how different zeolitic structures impact adsorption and separation capabilities, considering principles such as cation-pi interaction, pi-complexation, and steric separation concerning C2H4, C2H2, and C2H6 molecules. Furthermore, it discusses methods to enhance the separation performance of zeolites and zeolite-based adsorbents, encompassing structural design, modifications, and ion exchange processes. Finally, it summarizes current research trends and future directions, highlighting the potential application value of zeolitic materials in the field of C2H4, C2H2, and C2H6 separation and offering recommendations for further investigation.

关键词： zeolite ethylene ethane cation-pi interaction pi-complexation ADSORPTIVE SEPARATION CARBON-DIOXIDE C2H4 PURIFICATION FRAMEWORKS sorbents REMOVAL

NO removal performance of CO in carbonation stage of calcium looping for CO_(2) capture

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Chinese Journal of Chemical Engineering 2021年第9期34卷 30-38页

作者： Wan Zhang Yingjie Li Yuqi Qian Boyu Li Jianli Zhao Zeyan Wang School of Energy and Power Engineering Shandong UniversityJinan 250061China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China

Calcium looping realizes CO_(2)capture via the cyclic calcination/carbonation of *** combustion of fuel supplies energy for the *** is unavoidable that some unburned char in the calciner flows into the carbonator,generating CO due to the hypoxic atmosphere in the *** can reduce NO in the flue gases from coal-fired power *** this work,NO removal performance of CO in the carbonation stage of calcium looping for CO_(2)capture was investigated in a bubbling fluidized bed *** effects of carbonation temperature,CO concentration,CO_(2)capture,type of CaO,number of CO_(2)capture cycles and presence of char on NO removal by CO in carbonation stage of calcium looping were *** possesses an efficient catalytic effect on NO removal by *** temperature and high CO concentration lead to high NO removal efficiency of CO in the presence of *** account of better NO removal and CO_(2)capture,the optimal carbonation temperature is 650℃.The carbonation of CaO reduces the catalytic activity of CaO for NO removal by CO due to the formation of CaCO_(3).Besides,the catalytic performance of CaO on NO removal by CO gradually decreases with the number of CO_(2)capture *** is because the sintering of CaO leads to the fusion of CaO grains and blockage of pores in CaO,hindering the diffusion of NO and *** high CaO content and porous structure of calcium-based sorbents are beneficial for NO removal by *** presence of char promotes NO removal by CO in the ***_(2)/NO removal efficiencies can reach above 90%.The efficient simultaneous NO and CO_(2)removal by CO and CaO in the carbonation step of the calcium looping seems promising.

关键词： sorbents Carbon monoxide CO_(2)capture NO removal Carbonation stage Calcium looping

Fabrication of lithium silicates from zeolite for CO2 capture at high temperatures

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Journal of Energy Chemistry 2019年第6期28卷 81-89页

作者： Yu Zhang Yanshan Gao Benoit Louis Qiang Wang Weiran Lin College of Environmental Science and Engineering Beijing Forestry UniversityBeijing 100083China ICPEES - Institut de Chimie et Procedes pour l’energie l’Environnement et la SanteUMR 7515 CNRS - Universite de Strasbourg67087 StrasbourgFrance Beijing Research Institute of Chemical Industry SINOPECBeijing 100013China

Li4Si O4 has been regarded as one of the most promising high-temperature CO2 ***,for practical applications,its CO2sorption kinetics,cycling stability and sorption properties at lower temperatures or lower CO2 concentrations have to be *** this contribution,four Li4Si O4 sorbents were synthesized from zeolite precursors MCM-41,MCM-48,TS-1,and *** CO2 uptake,cycling stability and the optimal CO2 sorption conditions were *** the samples,MCM-41-Li4Si O4 showed the best cycling stability at 650°C,with a stable reversible CO2 uptake of 29.1 wt%under 100 vol%CO2 during 20 *** its sorption kinetics and CO2 uptakes at lower temperatures and lower CO2 concentrations need to be *** then demonstrated that the sorption kinetics can be improved by modifying the MCM-41 precursor with metals such as Al,Ti,Ca,and *** Na-MCM-41-Li4Si O4 sample exhibited the highest sorption rate,and reached the equilibrium sorption capacity close to the theoretical value of 36.7 wt%within 20 *** addition,we proved that coating the MCM-41-Li4Si O4with Na2CO3and K2CO3can significantly increase the CO2uptakes at lower temperatures(e.g.550℃)and lower CO2concentrations(10–20 vol%).At 550℃ and under 20 vol%CO2,15 wt%K2CO3-MCM-41-Li4Si O4 and 10 wt%Na2CO3-MCM-41-Li4Si O4 sorbents resulted in a CO2 uptake of 32.2 wt%and 34.7 wt%,respectively,which are much higher than that of MCM-41-Li4Si O4(11.8 wt%).These two sorbents also showed good cycling *** promoiting mechasnim by alkali carbonate coating was discussed by a doubleshell model.

关键词： Li4SiO4 Zeolite Lithium silicate-based CO2 sorbents Global warming

Sponge-based materials for oil spill cleanups: A review

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Frontiers of Chemical Science and Engineering 2020年第5期14卷 749-762页

作者： Edward Mohamed Hadji Bo Fu Ayob Abebe Hafiz Muhammad Bilal Jingtao Wang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China College of chemical engineering Nanjing Forestry UniversityNanjing 210037China

Elimination of leaked oil from aquatic environs has recently gained importance owing to the disasters associated with leakages into marine *** need for an environmentally friendly and viable line of action concerning the environs has brought forward numerous affordable,non-toxic,and decomposable materials;further,diverse biomasses for fabricating nano-to micro-scale materials,membranes,and sponges/aerogels have also been incorporated for the elimination and retrieval of oils from ***,selectivity,sorption capacity,and reusability of these materials after the retrieval of oils are also desired from the viewpoint of *** review encompasses the recent progress in the field of elimination and retrieval of oil spills using various sponge-based materials.

关键词： membranes sponges reusability sorbents selectivity sorption capacity

Treatment of tunnel wash waters-experiments with organic sorbent materials. PartⅡ: Removal of toxic metals

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Journal of Environmental Sciences 2008年第8期20卷 1042-1045页

作者： PARUCH Adam M ROSETH Roger Bioforsk-the Norwegian Institute for Agricultural and Environmental Research Soil and Environment Division

In the first part of the article, the column and the bag experiments concerning removal of polycyclic aromatic hydrocarbons (PAHs) and nonpolar oil (NPO) from tunnel wash waters using organic sorbent materials have been described. This part presents the results of removal of toxic metals. The metals of concern (Al, As, Cd, Cr, Cu, Fe, Pb, Mo, Ni, and Zn) were selected based on the priority toxicant pollutants defined in surface water quality criteria. Concentrations of these metals in the collected effluent...

关键词： electrostatic filters reduction level sorbents tunnel toxic metals treatment efficiency wash water

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