Ultra-sensitive detection and scavenging of arsenic ions and ciprofloxacin using 3D multipurpose hemicellulose based aerogel: Adsorption mechanism and RSM optimization.

Trace level detection and efficient removal of arsenite ions (As (III)) and ciprofloxacin (CPR) antibiotic was achieved using hemicellulose based ratiometric fluorescent aerogel. Hemicellulose derived from rice straw was oxidised to dialdehyde hemicellulose followed by crosslinking using chitosan via a Schiff base reaction (C = N) yielding a highly porous 3D fluorescent aerogel (CS@DAHCA). Various factors governing adsorption were analyzed by applying response surface methodology (RSM) approach.

Effective adsorption of perrhenate ions on the filamentous sheath-forming bacteria, Sphaerotilus montanus, Sphaerotilus natans and Thiothrix fructosivorans.

Aims: This study aimed to unveil perrhenate sorption properties of the filamentous sheaths formed by Sphaerotilus montanus, Sphaerotilus natans and Thiothrix fructosivorans.

Methods And Results: The adsorptions of perrhenate on lyophilizates of the above-mentioned filamentous sheaths were analysed by ICP, IR, XPS and EDX. The capacity reached 82 mg per g-adsorbent, when using S.

Selenate adsorption on pre-coordinated Fe3+-silane complexes grafted on mesoporous silicas.

Fe3+ was coordinated N-[2-(aminoethyl)-3-aminopropyltriethoxysilane], AEAPTES, followed by being grafted on MCM-41, SBA-15 and Cab-O-sil M7D. The mixing ratio, n = [AEAPTES]/[Fe], in the above coordination reaction was varied from 1 to 3. These nine functionalized silicas, denoted as Fe(en)n-silica (n = 1, 2, 3 and silica = MCM-41, SBA-15 and M7D), were used for the adsorption of aqueous selenate.

Different modes of adsorptions of arsenate on silica grafted with Fe3+-coordinated silanes.

In order to optimize the adsorption of arsenate, we prepared silica based adsorbents by grafting Fe(3+)-coordinated N-(2-aminoethyl)-3-aminopropyltriethoxysilanes (aeaptes) in various Fe:aeaptes ratios (mixing ratios). Two kinds of mesoporous silica (MCM-41 and SBA-15) and fumed silica (Cab-O-sil M7D) were used as substrates. The adsorption of arsenate saturated at As/Fe=1, 2 and 3 on mesoporous silica based adsorbents from with Fe:aeaptes ratios of 1:1, 1:2 and 1:3, respectively.

Grafting of precoordinated Cu(2+)-N-(2-aminoethyl)aminopropylsilane complexes onto mesoporous silicas and the adsorption of aqueous selenate on them.

N-(2-Aminoethyl)aminopropylsilane (AeAptes) was coordinated with Cu(2+) with Cu:AeAptes ratios of 1:1 and 1:2. These were then grafted onto MCM-41 [the products being denoted as Cu(en)-MCM-41 and Cu(en)2-MCM-41, respectively] and SBA-15 [the products being denoted as Cu(en)-SBA-15 and Cu(en)2-SBA-15, respectively]. The periodic structures of these mesoporous silica frameworks were well-retained after grafting.

A Li rechargeable battery cathode composed of Li2MnSiO4 nanoparticles in CMK-1.

We loaded nanoparticles of lithium manganese silicate in the mesopores of CMK-1 periodic mesoporous carbon in order to obtain electrode composed of nanoparticles with a good electric conductivity. The structure was analysed by XRD, nitrogen adsorption, and TEM. Two kinds of framework CMK-1 were prepared; CMK-1 (2.

Grafting of paired 3-aminopropyltrialkoxy silanes onto mesoporous silica and adsorptions of isomers of benzenedialdehydes.

A pair of 3-aminopropyltriethoxysilane molecules coupled with m- and p-benzenedialdehydes are grafted onto SBA-15 mesoporous silica, followed by the removal of benzenedialdehyde by hydrolysis. These paired 3-aminopropyl-grafted SBA-15, denoted (m)N- and (p)N-SBA-15, respectively, adsorb their own template benzenedialdehydes with a larger Langmuir constant K(L) than in other combinations of adsorbates and adsorbents. In addition, K(L) for the m-isomer is larger in the adsorption on (m)N-SBA-15 than on (p)N-SBA-15 and vice versa for the p-isomer.

X-ray absorption fine structure combined with X-ray fluorescence spectroscopy. Monitoring of vanadium sites in mesoporous titania, excited under visible light by selective detection of vanadium Kbeta5,2 fluorescence.

The photocatalytic role of vanadium doped in mesoporous TiO2 has not been clarified. Valence state-sensitive V Kbeta5,2-selecting (5462.9 eV) X-ray absorption fine structure (XAFS) was used to monitor the V sites in mesoporous TiO2 for ethanol dehydration under equilibrium in situ conditions and visible light-illumination.

X-ray absorption fine structure combined with x-ray fluorescence spectrometry. Part 15. Monitoring of vanadium site transformations on titania and in mesoporous titania by selective detection of the vanadium K alpha1 fluorescence.

X-ray absorption fine structure combined with X-ray fluorescence spectrometry was applied to various V+TiO2 hybrid samples. Emitted V K alpha1 fluorescence from the sample was selectively counted by using a high-energy-resolution (0.4 eV) spectrometer equipped with a Ge(331) crystal.

Fe(3+) coordinated to amino-functionalized MCM-41: an adsorbent for the toxic oxyanions with high capacity, resistibility to inhibiting anions, and reusability after a simple treatment.

Fe(3+) coordinated to amino ligands fixed on MCM-41 mesoporous silica works as a strong adsorbent for toxic oxyanions. The maximum adsorption amounts were 1.56, 0.

The effect of the counteranion on the formation of mesoporous materials under the acidic synthesis process.

The presence of various counteranions at the interfacial region of the silicate-surfactant mesophase introduces opportunities for manipulation of the phase structure. Well-ordered 3D-hexagonal P63/mmc, cubic Pmn, 2D-hexagonal p6mm, and cubic Iad mesoporous materials have been synthesized with the same surfactant, cetyltriethylammonium bromide, in the presence of various acids. The counteranions of acidic media have resulted in increasing the surfactant packing parameter g in the order SO42- < Cl- < Br- < NO3-, which leads to the different time course of formation of mesostructures.

Structure of low concentrations of vanadium on TiO2 determined by XANES and ab initio calculations.

The major local structure of low concentrations (1-3 wt% V) of vanadium on TiO2 was determined to have two terminal oxo groups and in total five oxygen coordination by means of vanadium K-edge XANES and ab initio calculations of XANES spectra.