EMOVING the hazardous metals from wastewater especially industrial drainage is very important for preventing health problems in human beings, plants and animals. The ion exchanger has constructed as primary line of safeguards for that goal. In this study grafted polyamide-6 (PA-6) fibers with polymethacrylic acid (PMAA) was used as materials for the ion exchangers. Grafting was achieved under required time and temperature and the factors affecting the graft process were studied. The efficiency of the grafted fibers for adsorption of Cu 2+ , Pb 2+ and Cr 6+ was evaluated. The effect of adsorption parameters such as pH, duration of adsorption, initial ion concentration and the adsorption temperature on the degree of extraction (R %) and adsorption capacity (SC, mg/g) was studied. Optimization the conditions for the preparation on laboratory scale, adjustment and adaptation of these conditions to suit the production of these grafted fibers on pilot scale was accomplished.

T HE present work aims to assess the effectiveness of Nylon-6 nonwoven fabrics containing antimicrobial substance (AS) and grafted with poly methacrylic acid (PMAA), polydimethylaminoethylmerthacrylate (PDMAEMA) and the blended fabric containing the above mentioned two types of nonwoven fabrics for air and gas filtration. The efficiency of the textile filters on the removal of anions and cations pollutants from the atmosphere of the selected indoor sites were studied under the normal conditions in the indoor environment. Air samples were collected before and after fitting the three tested types of textile nonwoven filters. The absorption method was used for collecting the gaseous pollutants, SO 2 , NO 2 and NH 3 , before and after filtration. The removal efficiency % of each filter was calculated. Nonwoven fabric containing 1:1wt/wt from two types of nonwoven fabrics showed high removal efficiency when applied for the collection of suspended anion and cation particulates.

No abstract

I N THIS study, the adsorption characteristics and performance of activated carbon fibers (ACF) were prepared from Polyacrylonitrile (PAN) waste, for removal of heavy metals was investigated. The effects of heavy metals concentration, adsorption temperature, pH of adsorption solution and contact time for removal of iron sulfate and lead acetate were studied to determine the best performance properties. The surface of ACF before and after adsorption process was investigated by scanning electron microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDX). The adsorption characteristics were mainly affected by pH of adsorption media and the adsorption temperature. The pH 4.0 was the optimum one for the adsorption processes of iron sulfate and lead acetate. Increasing the adsorption temperature from 30 -80°C improved the removal efficiency of Fe(Ⅱ) from 71 % to 94 % and for Pb(II) increased from 57 % to 83 % . The surface of ACF after adsorptions is characterized by the formation of some precipitations on the surface of ACF. These precipitations and granulation are noticed. EDX analysis confirms the presence of Fe(II) and Pb(II) onto ACF after adsorptions.