Madrid, L. and De Arambarri, P., 1978. Adsorption isotherms and hysteresis of proton adsorption by goethite. Geoderma, 21: 199-208. The adsorption of H+ions by goethite is only partially reversible and the adsorption process is faster than desorption. The adsorptian isotherm shows two inflexion points at pH y,alues 7.5 and 9.5, which can be attributed to the existence of two ar more types of OH...

In the present study, the separation and purification characteristics of resveratrol from extract of peanut sprouts (PSE) on 11 macroporous adsorption resins were investigated. The results showed that ADS-5 offered better adsorption and desorption capacity for resveratrol than other tested resins. From the static experiments with ADS-5 resin, we found that the experimental data fitted best to t...

Alkali treated Citrus limetta peels were used for recovery of Ga(III) from its aqueous solution. The raw and alkali treated peels were characterized for functional groups. The efficiency of adsorption increased from 47.62 mg/g for raw peels to 83.33 mg/g for alkali treated peels. Between pH 1 and 3, the adsorption increased and thereafter decreased drastically. The adsorption followed pseudosec...

Water vapor adsorption on activated carbon cloth (ACCBO) which has been oxidized to a level of 32% oxygen exhibits a unique isotherm with uniform hysteresis of small magnitude upon desorption. In contrast the adsorption on untreated ACCBO and chemically modified ACCBO (7.8% Cl), ACCBO (16% Cl), and ACCBO (4% N), exhibits sigmoidal isotherms with hysteresis loops of varying magnitudes. The latte...

in this study, mesoporous mcm-41 has been modified by incorporation of aluminum ion asa rapid, simple and inexpensive method for modification. the adsorbent is characterized usingpowder x-ray diffraction and nitrogen adsorption-desorption isotherm data. the distributioncoefficient of cadmium ion on the mesoporous aluminosilicates has been enhanced with theincrease of the aluminum in the framewo...

The applicability of 3D-printed activated carbons for their use to CO2 capture in post-combustion streams and the influence activation conditions on uptake N2 selectivity were studied. For two monoliths with same open cellular foam geometry but low high burnoff during activation, a series fixed-bed breakthrough adsorption experiments under typical conditions, wide range temperature (313 373 K),...

Solid-state post-combustion CO2 sorbents have certain advantages over traditional aqueous amine systems, including reduced regeneration energy since vaporization of liquid water is avoided, tunable pore morphology, and greater chemical variability. This report includes two parts, i.e., the design and synthesis of nitrogen-doped porous carbons as CO2 sorbents and the development of a robust tech...

Herein, dithiocarbamate-modified biochar (BC-HDTC) was successfully synthesized with nitric acid (HNO3), thionyl chloride (SOCl2), branched PEI and carbon disulfide (CS2). The effective anchoring of amine dithiocarbamate groups onto the surface proven by SEM, FTIR, XPS, N2 adsorption–desorption experiment. batch experiments demonstrated BC-HDTC can selectively remove 98% Pb(II) within multi-met...

Generation and entrance of toxic materials to aqueous environment causes many problems human health. In the current study, removal efficiency Cd (II) Ni(II) from solution was investigated by carbonaceous magnesium oxide. Three types C-MgO adsorbents were synthesized via pyrolysis prepared complex Mg(acac)2 at three temperatures. Fabricated characterized XRD, SEM, BET. XRD results revealed that ...

The complete oxidation of isopropanol in its liquid phase at a low temperature was studied the presence zinc oxide (ZnO). This solid prepared with precipitation method. Structural analysis (infrared Fourier transform and diffraction X-rays) textured (adsorption/desorption N2) were conducted for wurtzite structure results, an IV type isotherm H3 hysteresis. presents good catalytic activity again...