An organic-inorganic hybrid catalyst was synthesized by silylation of silanol (SiOH) groups with ammonium bromide group on the mesopore wall of mesoporous zeolite having a hierarchically nanoporous architecture, conferring both electrophilic and nucleophilic functions due to the acid sites of th...

Ring-opening polymerization (ROP) of five-membered cyclic carbonates suffers from fractional decarboxylation during polymerization. The phenomenon is well-established for polymerization of ethylene carbonate. Propylene carbonate has similar five-membered ring structure, however, there is an addi...

Ionic liquids (ILs) have remarkable features which make them applicable in numerous processes as environmentally friendly and promising chemicals. However, high viscosity and moderate conductivity of pure ILs have limited their application. Propylene carbonate (PC) is one of the most important a...

Absorption of CO2 from a CO2/N2 mixture with propylene carbonate (PC) as the absorbent using a rotating packed bed (RPB) in pilot scale was systematically investigated in this paper. RPB is characterized by simple operation and high efficiency with small volume, which may be an alternative metho...

In this work, solubility and diffusivity of CO2 in propylene carbonate have been experimentally obtained using the pressure decay method. Pressure decay data were produced at three different temperatures of 276.15, 298.15, and 328.15 K, and different initial pressures. The tests were conducted w...

Corn starch was melt-blended with glycerol (70/30) to prepare thermoplastic starch (TPS) at 140 °C for 10 min. The TPS was melt-blended with polyethylene grafted with maleic anhydride (PE-MAH) and carboxymethyl cellulose (CMC) to improve the properties of the TPS. Phase determination analysis a...

Quinoa starch granules were esterified with dodecenyl succinic anhydride (DDSA) to various degrees of substitution (DS) (0.0023 to 0.0095). Physicochemical properties and emulsification capacity of the modified starch were studied. Increasing DS increased the particle size, water solubility, and...

A novel pH gradient methodology was used to synthesise a series of Cu–ZrO2 catalysts containing different quantities of Cu and Zr. All of the catalysts were highly selective to the desired product, γ-valerolactone, and are considerably more stable than Cu–ZrO2 catalysts prepared by other co-p...

One-pot conversion of furfural to the target product γ-valerolactone (GVL) is a challenging and meaningful part of biomass exploitation. Development of heterogeneous catalysts with both Brønsted and Lewis acid properties has proved to be promising and useful because they offer an efficient way ...

The formal synthesis of Cladospolide-C and its analog is achieved by using enantiopure (R)-γ–valerolactone 10. The significant points of this synthesis are the stereoselective dihydroxylation of α, β-unsaturated ester 16 using Sharpless protocol, Wittig olefination of γ –valerolactol 6 wit...

A highly efficient catalyst system was developed for the one-pot transformation of furfural to γ-valerolactone (GVL) in an open system. The cascade of two Meerwein Ponndorf Verley (MPV) reductions, ring-opening and esterification reactions was catalyzed by a physical mixture of Zr- and Al-HY ze...

Bio-based products and processes were favored recently, because shifting towards a more sustainable economy might be a long-term solution for global challenges. Within this context, γ-valerolactone emerges as a sustainable alternative for industrially relevant solvents and as a potential additi...

The wire-like Fe3+-doped (BiO)2CO3 photocatalyst was synthesized by a hydrothermal method. The photocatalytic property of Fe3+-doped (BiO)2CO3 nanowires was evaluated through degradation of sodium isopropyl xanthate under UV–visible light irradiation. The as-prepared Fe3+-doped (BiO)2CO3 nanowi...

The removal of four alkyl xanthates (ethyl, isopropyl, n-butyl and n-amyl) by the O3 and UV/O3 processes was investigated in a semi-batch, bubble column reactor. Each alkyl xanthate was almost completely decomposed within 10 min by both the O3 and UV/O3 processes, confirmed by UV–vis spectrosco...

In this paper, a novel surfactant, O-isopropyl-S-[2-(hydroxyimino) propyl] dithiocarbonate ester (IPXPO) was synthesized and first introduced as a collector, and its flotation behavior and adsorption mechanism to chalcopyrite were investigated by micro-flotation, adsorption thermodynamics and ki...

(BiO)2CO3 nanowires were prepared by simple hydrothermal treatment of commercial Bi2O3 powders and characterized by X-ray diffractometry, scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, and X-ray photoelectron spectroscopy (XPS). The photocatalytic acti...

This paper presents results of a laboratory study designed to look into the effect of calcium on sphalerite hydrophobization with xanthate making use of zeta potential, contact angle, microflotation and UV/vis spectrometry techniques. The experimental results show that xanthate adsorbs onto the ...

Xanthate collectors have been industrially used for the flotation of pyrite in the gold mining industry because pyrite is the most common gold-bearing mineral. However, after reviewing the structure-activity relationship study of flotation collectors, the influence of hydrophobic groups on the f...

A photocatalyzed redox generation of radicals from O-ethyl xanthates to generate electrophilic radicals under photoredox catalysis, using Ir(ppy)3 and blue LEDs irradiation is described. The protocol can be used in classical xanthate-based inter- and intra-molecular group transfer reactions and ...

The residual organic reagents (including xanthates) in the flotation tailings can cause environmental issues during their disposal, besides their deleterious influence on the flotation performance during recycling. In this study, the adsorption characteristics of bentonite modified with copper a...