Abstract Continuous SAPO‐34 membranes were prepared on porous alumina tubular supports, and shown to be useful for light gas separations at low high temperatures. Single‐gas permeances of CO 2 , N CH 4 decreased with increasing kinetic diameter. For the best membrane 300 K, He H less than that because He, small compared pore, differences in heat adsorption determined permeance order. The smaller component permeated fastest /CH /N mixtures between 470 K. /CO mixtures, which separated by...

Four types of hydrophilic zeolite membranes (A-type, Al−ZSM-5, mordenite, and Y-type) were used to dehydrate water/THF mixtures by pervaporation. At 303 K, the total fluxes increased with pore size, lower Si/Al ratios had higher separation selectivities. The Y-type membrane, which was prepared using a template-free seeding technique, highest flux selectivity; at 333 2.4 kg m-2 h-1 selectivity 290. water feed concentration, but decreased. Separation based on both preferential adsorption...

Trong nghiên cứu này, chất hấp phụ sinh học LC/NaOH-EDTA đã được tổng hợp thành công bằng phương pháp biến tính bề mặt sử dụng NaOH và axit Ethylenediaminetetraacetic (EDTA). Các đặc hình thái của xác định cách nhiễu xạ tia X (XRD), kính hiển vi điện tử truyền qua (TEM), quét (SEM), quang phổ hồng ngoại đổi Fourier (FT-IR), đường đẳng nhiệt phụ/tách N2, thế zeta tán năng lượng (EDS). Chất thể hiện khả loại bỏ tuyệt vời đối với ion Pb2+ trong nước. Dưới các điều kiện tối ưu bao gồm hàm là 1,0...

All-silica β zeolite is shown to be effective for MTBE removal from water. The silica was prepared directly gel, and it more than dealuminated adsorption. Water 2-propanol adsorption isotherms showed that the all-silica hydrophobic β. amount of adsorbed on increased linearly with concentration 9.4 590 μg/L.

1,3-Propanediol was separated from aqueous solutions by pervaporation through an X-type zeolite membrane on a γ-Al2O3 support. Binary, ternary, and quaternary mixtures cell-free fermentation broth were used. At 308 K, the total fluxes for solution 2.1 1.2 kg/(m2 h), respectively. Pervaporation of all components increased with temperature, but water flux at fastest rate. From to 328 1,3-propanediol/glycerol selectivity model 59 67; it 61 110 broth. The 1,3-propanediol/glucose 1900 2200....

A Ge-substituted ZSM-5 membrane prepared on a porous, tubular, stainless steel support was effective for the separation of acetic acid from water by pervaporation. The Ge−ZSM-5 had higher fluxes and lower pure than silicalite-1 because it is more hydrophobic silicalite-1. selective preferential adsorption acid, both flux selectivity increased with temperature. total decreased slightly as feed concentration 0.33 to 5 wt %, one-half its initial value. For % feed, 0.43 kg/(m2·h) at 363 K an...

Seven types of zeolite membranes were synthesized on the inside surfaces alumina and stainless steel supports. The medium-pore (MFI, MEL, a MFI + MEL composite) prepared by using organic templates, whereas larger pore (MOR, FAU) template-free method. These used in pervaporation to separate 1,3-propanediol from glycerol glucose an aqueous solution. All had 1,3-propanediol/glycerol selectivities higher than 27, size did not have large influence membrane selectivity, which was mainly due...

Abstract The chemical bonding of titanium in MFI‐type zeolites (Ti‐silicalite) has been investigated using x‐ray photoelectron spectroscopy (XPS). Different silicalites as well pure titania (anatase) have analysed. We found a distinctively higher binding energy the Ti 2p photoelectrons Ti‐silicalite than titania‐ or anatase‐containing silicalite. same oxidation state all solids under study. attribute difference to different oxygen coordinations framework (tetrahedral) and anatase...

Abstract Reduced graphene oxide (rGO) were prepared by thermal reduction technique from (GO) in N 2 gas atmosphere at 600°C for 1 h. The results shown that rGO possessed a multiple layer structure and specific surface area BET of 389.9 m /g. electrochemical properties the materials have been investigated supercapacitors. Electrochemical measurements show exhibit capacitance 85.3 F/g A/g, still kept 85 % after 1000 cycles indicating could be promising candidate high‐performance supercapacitor...

Abstract Rod‐like MgO was prepared by the simple precipitation method and subsequently evaluated for CO 2 capture efficiency under ambient‐temperature adsorption intermediate‐temperature regeneration. The precursor analyzed thermogravimetric analysis (TGA) X‐ray power diffraction (XRD), it decomposed completely at 500°C to form MgO. as‐synthesized samples were characterized XRD, BET FE‐SEM. comprised of grains with an approximate length 4‐6 μm diameter 0.5 μm. surface area 330.5 m /g, which...

Abstract In this paper, we developed a facile and fast method to prepare porous ZnO nanoparticles as an excellent photocatalyst by chemical route using citrate capping agent for the degradation of tartrazine from aqueous solution. For comparison, rods flowers were prepared their photocatalytic ability also was evaluated. The as‐synthesized samples characterized XRD, SEM, N 2 adsorption/desorption. XRD results showed that as‐prepared highly crystalline with hexagonal wurtzite structure....

Synthetic Aperture Radar (SAR) remote sensing data can be used as an effective alternative to detect surface water and provide useful information regarding operational flood monitoring, in particular for the improvement of rapid assessments. However, this application frequently requires standard simple, yet robust, algorithms. Although thresholding approaches meet these requirements, limitations such inequality over large spatial regions challenges estimating optimal threshold values remain....

Trong nghiên cứu này, vật liệu Ag/ZnO/g-C3N4 được điều chế bằng phương pháp nung đơn giản. Hoạt tính xúc tác quang của các mẫu tổng hợp đánh giá cách phân hủy tetracycline hydrochloride (TCH) trong dung dịch nước. Đặc tích máy đo tia cực tím nhìn thấy phản xạ khuếch tán (DR/UV-Vis), nhiễu X (XRD), kính hiển vi điện tử quét (SEM), truyền qua (TEM), năng lượng (EDS) và kỹ thuật phổ hồng ngoại biến đổi Fourier (FT-IR). Vật có vùng cấm là 3,17 eV, thấp hơn nano ZnO. gồm hạt hình cầu kích thước...

Abstract High‐quality boron and aluminium‐substituted ZSM‐11 membranes were prepared on porous tubular supports to separate alcohols from water by pervaporation. The C 1 –C 3 preferentially separated aqueous solutions through the B‐ZSM‐11 membrane, maximum flux was 1.7 kg/m 2 ·h for a 5 wt.% methanol/water mixture. alcohol fluxes decreased as carbon number increased. separation selectivity with pervaporation temperature, but other alcohol/water selectivities All increased decreasing feed...

This paper presents a summary of research on magnetic nanoparticles (MNPs) carried out recently at the Institute Materials Science. Three families oxide MNPs namely magnetite, manganite and spinel ferrite materials were prepared by several methods: co-precipitation, sol-gel high-energy mechanical milling. Magnetite encapsulated two natural polymers, starch chitosan. The structure nanosystems was characterised XRD, SEM, TEM techniques while their magnetisation measured VSM PPMS. heating (MH)...

Abstract In this paper, the flower‐like ZnO nanostructure was prepared by hydrothermal method. As‐synthesized sample characterized XRD, SEM, and N 2 adsorption/desorption isotherm. The photocatalytic performance of evaluated degradation caffeine under UV irradiation. effects various reaction parameters such as catalyst dosage, pH solution, concentration on were investigated. results showed that 3 g/L could completely degrade 5 mg/L neutral or desired alkaline medium within 120 min. addition,...

Flood monitoring systems are crucial for flood management and consequence mitigation in prone regions. Different remote sensing techniques increasingly used this purpose. However, the different approaches suffer various limitations, including cloud weather effects (optical data), low spatial resolution poor colour presentation (synthetic aperture radar data). This study fuses two data types (Landsat Sentinel-1) to overcome these limitations produce better quality images a prototype...

Abstract Mesoporous SiO 2 was prepared from rice husk for removal of methylene blue (MB) aqueous solution. As‐prepared characterized by FE‐SEM, TEM, XRD, FT‐IR and N adsorption/desorption isotherm. The effects dosage contact time on adsorption dye were investigated. optimal removing 0.05 g the efficiency reached to 91.9 % after 50 min adsorption. kinetic studied understand mechanism process. data analyzed pseudo‐first‐order, pseudo‐second‐order, intra‐particle diffusion models. results...

The crystallization process of hypoeutectic white cast iron consists the first secreted austenite branch after reaction -carbide crystal is formed, and phase fills in middle branches. If branches are small smooth, crystals carbide fine. with 13% chromium which has 3 - 3.2% carbon, have crystalline as M7C3. elements rare earth a strong affinity for oxygen sulfur to produce oxides. These oxides can create heterogeneous germ center phases smooth down these phases. effect on M7C3 chrome been...