21 research outputs found
āļāļĨāļāļĻāļēāļŠāļāļĢāđāđāļĨāļ°āđāļāđāļāđāļāļāļĢāđāļĄāļāļēāļĢāļāļđāļāļāļąāļāļāļ°āļāļĢāļēāļāļĩāļāđāļāļĒāđāļāđāļāļāļēāļĢāđāđāļĄāđāđāļāđKinetic and Isotherm Adsorption of Atrazine by Bamboo Biochar
āļāļēāļāļ§āļīāļāļąāļĒāļāļĩāđāļĄāļĩāļ§āļąāļāļāļļāļāļĢāļ°āļŠāļāļāđāđāļāļ·āđāļāļāļĢāļ°āđāļĄāļīāļāļāļĢāļ°āļŠāļīāļāļāļīāļ āļēāļāļāļēāļĢāļāļđāļāļāļąāļāļāļ°āļāļĢāļēāļāļĩāļāļāđāļ§āļĒāđāļāđāļāļāļēāļĢāđāļāļĩāđāļŠāļąāļāđāļāļĢāļēāļ°āļŦāđāļāļēāļāđāļĄāđāđāļāđ āđāļāļĒāļĻāļķāļāļĐāļēāļāļļāļāļŠāļĄāļāļąāļāļīāļāļēāļāļāļēāļĒāļ āļēāļāđāļĨāļ°āđāļāļĄāļĩāļāļāļāđāļāđāļāļāļēāļĢāđāđāļĄāđāđāļāđ āđāļĨāļ°āļĻāļķāļāļĐāļēāļĢāļ°āļĒāļ°āđāļ§āļĨāļēāļŠāļĄāļāļļāļĨ āļāļĢāļ°āļŠāļīāļāļāļīāļ āļēāļāļāļēāļĢāļāļđāļāļāļąāļ āđāļāđāļāđāļāļāļĄ āļĢāļ§āļĄāļāļąāđāļāđāļāļāļāļģāļĨāļāļāļāļĨāļāļĻāļēāļŠāļāļĢāđāļāļēāļĢāļāļđāļāļāļąāļāļāļ°āļāļĢāļēāļāļĩāļāļāļāļāđāļāđāļāļāļēāļĢāđāđāļĄāđāđāļāđ āļāđāļ§āļĒāļāļēāļĢāļāļāļĨāļāļāđāļāļāļāļ° āļāļēāļāļāļļāļāļŠāļĄāļāļąāļāļīāļāļēāļāļāļēāļĒāļ āļēāļāđāļĨāļ°āđāļāļĄāļĩ āļāļāļ§āđāļē āđāļāđāļāļāļēāļĢāđāđāļĄāđāđāļāđāļĄāļĩāļāđāļē D50 āđāļāđāļēāļāļąāļ 200 āđāļĄāđāļāļĢāđāļĄāļāļĢ āļāļ·āđāļāļāļĩāđāļāļīāļ§āđāļāđāļēāļāļąāļ 756.43 āļāļēāļĢāļēāļāđāļĄāļāļĢāļāđāļāļāļĢāļąāļĄ āđāļĨāļ°āļĄāļĩāļāļĢāļīāļĄāļēāļāļĢāļĢāļđāļāļĢāļļāļāđāļāđāļēāļāļąāļ 0.32 āļĨāļđāļāļāļēāļĻāļāđāđāļāļāļāļīāđāļĄāļāļĢāļāđāļāļāļĢāļąāļĄ āđāļŠāļāļāđāļŦāđāđāļŦāđāļāļ§āđāļēāđāļāđāļāļ§āļąāļŠāļāļļāļāļđāļāļāļąāļāđāļāļ Micropore āđāļāļ·āđāļāļāļāļēāļāļĄāļĩāļāļāļēāļāļĢāļđāļāļĢāļļāļāļ āļēāļĒāđāļāđāļāļĨāļĩāđāļĒāđāļāđāļēāļāļąāļ 1.69 āļāļēāđāļāđāļĄāļāļĢ āļāļāļāļāļēāļāļāļąāđāļāļāļāļ§āđāļē āļĄāļĩāļāļēāļĢāļāļĢāļ§āļāļāļāļŦāļĄāļđāđāļāļąāļāļāđāļāļąāļāļāļāļāđāļŪāļāļĢāļāļāļāļīāļĨ (O-H) āđāļŪāđāļāļĢāļāļēāļĢāđāļāļāļāļāļĢāļ°āđāļ āļāļāļąāļĨāļāļīāļĨ (C-H) āļāļ°āļĨāļīāļāļēāļāļīāļ (C-H) āđāļĨāļ°āļāļ°āđāļĢāļĄāļēāļāļīāļ (C=C) āļāļĩāđāļŠāđāļāļāļĨāļāđāļāļāļ§āļēāļĄāļŠāļēāļĄāļēāļĢāļāđāļāļāļēāļĢāļāļđāļāļāļąāļāļŠāļēāļĢāļāļ°āļāļĢāļēāļāļĩāļ āđāļāļŠāđāļ§āļāļāļēāļĢāļāļĢāļ°āđāļĄāļīāļāļāļĢāļ°āļŠāļīāļāļāļīāļ āļēāļāđāļāļāļēāļĢāļāļđāļāļāļąāļāļŠāļēāļĢāļāļ°āļāļĢāļēāļāļĩāļāļāļāļ§āđāļē āđāļŦāđāļāļĢāļ°āļŠāļīāļāļāļīāļ āļēāļāđāļāļāļēāļĢāļāļđāļāļāļąāļ 92.1 āđāļāļāļĢāđāđāļāđāļāļāđ āļŦāļĨāļąāļāļāļēāļāđāļāđāļēāļŠāļđāđāļĢāļ°āļĒāļ°āđāļ§āļĨāļēāļŠāļĄāļāļļāļĨāļāļĩāđ 24 āļāļąāđāļ§āđāļĄāļ āļŠāļāļāļāļĨāđāļāļāļāļąāļāļŠāļĄāļāļēāļĢāđāļāđāļāđāļāļāļĢāđāļĄāđāļāļāļāļĢāļļāļāļāļīāļ āđāļāļĒāļĄāļĩāļāđāļēāļāļāļāļĩāđāļŠāļąāļĄāļāļąāļāļāđāļāļąāļāļāļ§āļēāļĄāļŠāļēāļĄāļēāļĢāļāđāļāļāļēāļĢāļāļđāļāļāļąāļ (KF) āđāļāđāļēāļāļąāļ 0.77 āđāļĄāđāļāļĢāļāļĢāļąāļĄāļāđāļāļāļĢāļąāļĄ āđāļĨāļ°āļāļēāļĢāļĻāļķāļāļĐāļēāđāļāļāļāļģāļĨāļāļāļāļĨāļāļĻāļēāļŠāļāļĢāđāļāļēāļĢāļāļđāļāļāļąāļāļāļĩāđāđāļŦāđāđāļŦāđāļāļ§āđāļēāđāļāđāļāđāļāļāļēāļĄāđāļāļāļāļģāļĨāļāļāļāļąāļāļāļąāļāļāļĩāđāļŠāļāļāđāļāļĩāļĒāļĄ āļāđāļ§āļĒāļāđāļē R2 āđāļĨāļ° SSE āđāļāđāļēāļāļąāļ 0.9998 āđāļĨāļ° 0.0015 āļāļēāļĄāļĨāļģāļāļąāļ āđāļĄāļ·āđāļāļāļīāļāļēāļĢāļāļēāļāđāļēāļāļāļāļĩāđāļāļąāļāļĢāļēāđāļĢāđāļ§āļāļāļīāļāļīāļĢāļīāļĒāļēāļāļąāļāļāļąāļāļŠāļāļ (K2) āļĄāļĩāļāđāļēāđāļāđāļēāļāļąāļ 0.1306 āđāļĄāđāļāļĢāļāļĢāļąāļĄāļāđāļāļāļĢāļąāļĄāļāđāļāļāļēāļāļĩ āļāļķāļāļŠāļĢāļļāļāđāļāđāļ§āđāļēāļāļēāļĢāļāļđāļāļāļąāļāļāļēāļĻāļąāļĒāļāļĨāđāļāļāļąāđāļāļāļēāļāļāđāļēāļāļāļēāļĒāļ āļēāļāđāļĨāļ°āđāļāļĄāļĩ āļāļĨāļāļēāļĢāļāļāļĨāļāļāļāļąāđāļāļŦāļĄāļāđāļŠāļāļāđāļŦāđāđāļŦāđāļāļ§āđāļēāđāļāđāļāļāļēāļĢāđāđāļĄāđāđāļāđāļĄāļĩāļāļļāļāļ āļēāļāļŠāļđāļāđāļāļāļēāļĢāđāļāđāļāļ§āļąāļŠāļāļļāļāļđāļāļāļąāļāļŠāļēāļĢāļāļ°āļāļĢāļēāļāļĩāļ āļāļķāđāļāļāļąāļāđāļāđāļāļ§āļąāļāļŠāļļāļāļđāļāļāļąāļāļāļĩāđāļĄāļĩāļāđāļāļāļļāļāļāđāļģāļŠāļģāļŦāļĢāļąāļāļāđāļāļāļāļąāļāļŠāļēāļĢāđāļāļĄāļĩāļāļēāļāļāļēāļĢāđāļāļĐāļāļĢāļāļāļāļŠāļđāđāļāļāļāļāļ·āđāļāļāļĩāđāđāļĨāļ°āđāļāđāļēāļĄāļēāđāļāļāļ·āđāļāļāļĩāđThis research aims to evaluate the adsorption efficiency of atrazine using biochar synthesized from bamboo. The study primarily focuses on these aspects: bamboo biochar physical and chemical properties, the equilibrium time, adsorption efficiency, isotherm as well as adsorption kinetic model with batch testing. Regarding physical and chemical properties, bamboo biochar exhibited the D50 of 200 Ξm, surface area of 756.43 m2/g, average pore size of 1.69 nm and pore volume of 0.32 cm3/g. Considering these properties, the substance can be defined as a microporous carbon adsorbent. Also, the functional groups of bamboo biochar show the groups of hydroxyls (O-H), alkyl (C-H), aliphatic (C-H), and aromatic carbon (C=C), which have a positive effect on adsorption of atrazine. Form the evaluation of atrazine adsorption properties, the bamboo biochar has the adsorption efficiency of 92.1% after 24 h equilibrium time, corresponding to the Freundlich adsorption isotherm. The Freundlich constant (KF) is 0.77 Ξg/g. In term of adsorption kinetic model, the results indicated being the pseudo second order reaction kinetics with R2 value and SSE are 0.9998 and 0.0015, respectively. The pseudo-second order rate constant (K2) shows 0.1306 Ξg/g.min. This can be concluded that the adsorption of bamboo biochar used both physical and chemical mechanisms. Overall results indicated that bamboo biochar can be used as an effective, low-cost adsorbent for atrazine removal. Thus, the biochar can be used as a chemical barrier for controlling agrochemical contaminants into agricultural land
Comparative study on the preparation of belite cement from nano-silicas extracted from different agricultural wastes with calcium carbide residue
Belite cement was prepared using nano-silicas extracted from three different agricultural wastesâblack rice husk ash (BRHA), bagasse ash (BA), and palm oil fuel ash (POFA)âwhich were reacted at 1200 â 1400 °C with CaC2 residue as calcium source. The product was compared with that from CaCO3. Nano-silica extracted from BRHA was of very fine particle size (surface area 312.4 m2/g and V/S ratio 0.35 à 106 cm) and being highly reactive, forms Îē-C2S at lower firing temperatures; however, at higher temperatures, less-desirable Îģ-polymorphs are formed. Nano-silica extracted from POFA contains Na2O, Al2O3, and K2O impurities, which stabilize the Îē and Îą-forms and delay the transformation to Îģ-phase. This is reflected in relatively high compressive strength at firing temperature above 1200 °C, compared to other mixtures. Thus, these results indicate that the best combination of these waste materials for the preparation of belite cement phases is POFA ash and CaC2 residue
Experimental study of lightweight concrete prepared from super absorbent polymers (SAPs) and glass fibers (GF)
This study investigates the effect of super absorbent polymers (SAPs) and glass fiber (GF) additions on the properties of lightweight concrete. The SAPs act as the pore-forming agent, with the addition of various GF contents (0.1-1.0% by weight of dry ingredients). The results indicate that the use of SAPs at 7% by weight of OPC produces a product with similar properties to conventional lightweight concretes which meet the ASTM C332-17 standard. The addition of GF to the mixture tends to reduce the dry density and compressive strength, but increases the porosity and flexural strength. The results indicate that the use of SAPs at 7% by weight of OPC produce a product with similar properties to conventional lightweight concretes which meet the ASTM C332-17 standard. The 28-day compressive strengths decreased from 7.04âÂąâ0.07 for control sample to 4.59âÂąâ0.11 MPa, while the flexural strengths increased from 3.89âÂąâ0.04 for control sample to 6.72âÂąâ0.06 MPa. High-porosity lightweight concrete prepared from SAPs and GF shows reduced thermal conductivity and an increased sorption rate. The initial rate of water absorption gradually increases from 2.48âÃâ10â1 mm/sec0.5 in the sample without GF up to 5.45âÃâ10â1 mm/sec0.5 in the sample containing 1.0âwt.% GF. Comparison with the literature indicates that the use of SAPs as pore-forming agents in conjunction with GF have the potential to produce fiber-reinforced lightweight concrete with improved properties