Xianghai Meng

Investigation of organic matter adsorption from TNT red water by modified bamboo charcoal

AbstractBamboo charcoal impregnated with ZnCl2 (ZnCl2-BC) was used as an adsorbent to remove organic matters from TNT red water. The adsorption parameters, such as the adsorbent dosage, pH, contact time, dilution ratios of TNT red water, and temperature were studied. The equilibrium adsorption data were analyzed using Langmuir, Freundlich, and Temkin isotherms models. The Langmuir isotherm fitted the experimental results well. Kinetic analyses results showed that the adsorption kinetics was more accurately represented by the pseudo-second-order model. The studies of external diffusion and intraparticle diffusion models showed that external as well as intraparticle diffusions influenced on the actual adsorption process at different times and the removing velocity of organic matters from solution to the surface of adsorbent was very rapid. Thermodynamic studies showed that the adsorption of organic matters from TNT red water on ZnCl2-BC was a spontaneous, endothermic, and random process at the solid/solutio...

Utilization of recycled chemical residues from sodium hydrosulfite production in solid lubricant for drilling fluids

AbstractThe chemical residues from sodium hydrosulfite production contain complex chemical composition and give out a bad odor posing a grave threat to the environment and public health. The organic residues containing thiodiglycol, 2,2′-dithiodiethanol, and 1,4-thioxane are suitable for high pressure lubrication applications. In this paper, the chemical residues were recycled and used to prepare the solid lubricant for drilling fluids. The lubricity of solid lubricant was illustrated and the experimental results indicated that the solid lubricant could improve lubricity of drilling fluids, which had met the requirement of industrial applications. Experimental studies were also performed on its salt resistance, temperature resistance, and compatibility. The solid lubricant had passed pilot experiments and been used in the Changqing and Dagang oil fields in China. This study not only enables recycling of industrial products but also makes the clean production come true, which contributed to environment pro...