Keng-Ming Chen

Synthesis and surface activity of polyethylene glycol–maleic anhydride–polydimethylsiloxane polyester surfactants

Abstract A novel series of water-soluble polyethylene glycol (PEG)–silicone polyester surfactants has been prepared by the polymerization of PEG, maleic anhydride, polydimethylsiloxane and fumaric acid. The unique structural features of these surfactants have been confirmed by FTIR, proton nuclear magnetic resonance and elemental analysis. Also, the influences of the PEG segment lengths of PEG–silicone polyesters on the surface tension, wetting power and dispersant properties were investigated. The experimental results indicated that the solution that contained the PEG–silicone polyester surfactants exhibits excellent surface active properties.

Utilization of dried activated sludge for the removal of basic dye from aqueous solution

AbstractTextile dye wastewater can easily lead to environmental pollution issues because of its toxicity and difficult treatment. If the waste sludge produced from sewage treatment plant is used as an adsorbent to treat textile dye wastewater, waste recycling can be achieved. This study investigated the use of dried activated sludge (DAS) for the removal of Basic Red 29 dye from aqueous solution and used granular-activated carbon to compare differences in adsorption capacity. Influence on adsorption capacity of various factors, such as adsorbent properties, initial dye concentration and dye solution temperature, were investigated on the original dye solution. Kinetic data followed well both pseudo-first-order model and pseudo-second-order model. Equilibrium data fitted well with the Langmuir isotherm model. The monolayer adsorption capacity was found as 224.72 mg g−1 at 30°C. Thermodynamic studies indicated that adsorption process was exothermic in nature and the adsorption heat was −17.70 kJ mol−1. The F...

Polyethylene Glycol/Polydimethylsiloxane Polyester Products as Leveling Agents in Nylon Dyeing

A novel series of water-soluble PEG-silicone polyesters surfactants is prepared by polymerization of polyethylene glycol (PEG), maleic anhydride (MA), polydimethylsilox ane, and fumaric acid (FA). The unique structural features of these surfactants are confirmed by FTIR, 1H-NMR, and elemental analysis. The presence of these surfactants retards the rate of nylon dyeing with acid dyes, which, along with the low-foaming property of these novel PEG-silicone polyesters, makes it possible for these surfactants to be used as leveling agents for modem nylon dyeing with acid dyes.