131 research outputs found
Photo-Fenton process for treating biological laboratory wastewater containing formaldehyde
Photocatalytic degradation of Chromium (VI) from wastewater using nanomaterials like TiO2, ZnO, and CdS
PHOTOCATALYTIC REMOVAL OF TR I- AND HEXA-VALENT CHROMIUM IONS FROM CHROME-ELECTROPL ATING WASTEWATER
A novel technique based on photocatalysis was applied to eliminate chromium ions, a toxic hazardous environmental pollutant. The photoreduction of each species of chromium (total, hexavalent, and trivalent chromiums) from chrome-electroplating wastewater was investigated using a titanium dioxide suspension under irradiation by a low-pressure mercury lamp. The initial concentration of total chromium was 300 mg/l. The applied conditions were the direct photocatalytic reduction process at pH 3.65 and the indirect photocatalytic reduction with added hole scavengers at the same solution pH. Results from both processes were comparatively discussed. Result show that chromium was not efficiently removed by direct photoreduction. In contrast, with the adding of hole scavengers, which were formate ions, the photoreduction of chromium was very favorable. Both hexavalent and trivalent chromiums were efficiently removed. The photocatalytic mechanism is purposed in this study
Application of a triblock copolymer additive modified polyvinylidene fluoride membrane for effective oil/water separation
Corrigendum to âFacile synthesis of plasmonic Ag/AgCl nanoparticles with aqueous garlic extract (Allium sativum L.) for visible-light triggered antibacterial activityâ [Mater. Lett. 277 (2020) 128362]
Municipal Solid Waste Recovery and Recycling
ÂĐ 2014 by World Scientific Publishing Co. Pte. Ltd. All rights reserved. Recycling is a series of activities that includes collecting recyclable materials that would otherwise be considered waste, sorting, and processing recyclables into raw materials, and manufacturing them into new products. In this chapter, the collection of recyclable materials in both developed and developing countries are reviewed. The physical and chemical recycling methods are also included with necessary engineering calculation. Finally, the marketing of recyclable materials is also depicted
Advances in Anaerobic Systems for Organic Pollution Removal From Food Processing Wastewater
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
Adsorption of Thallium(I) Ions on Titania Particle Surfaces in Aqueous Media
A description is given of the modification of the adsorption of Tl(I) on a titania (Degussa P-25) surface by the presence of organic or inorganic co-additives in aqueous suspensions. The addition of oxalate, formate, acetate and phosphate anions (the latter at low levels below ~0.03 M) increased Tl(I) adsorption while the phosphate anion (at levels > ~0.03 M) inhibited Tl(I) adsorption. A surface complexation model comprising the titania surface sites, the anchor co-additives and bound Tl(I) species was invoked to explain the adsorption enhancement observed. The data presented build upon and complement those acquired earlier showing how metal ion adsorption on a TiO 2 surface is strongly influenced by co-additives in the aqueous medium
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