Detection and removing of lead from wastewater using chemical treatment of polyurethane foam waste: Batch and column experiments

Abstract

A new inexpensive sorbent was prepared from the waste of polyurethane foam (PUF) which highly surface polarity and sorption capacity. PUF was modified by adding amino, chloro and hydroxyl groups to its matrix. The polyamine polyhydroxy polyurethane chloride (PPPC) was characterized by using elemental analysis (EA), bulk conductivity (BC,σ), infrared/ultraviolet/visible spectra (IR/UV/Vis), pH point zero charge (pH ZCP), thermal analysis (TGA/DTA/DSC), scanning electron microscope (SEM) and X-ray diffraction (XRD). The PPPC owned improved stability in acidic/alkaline solutions and organic solvents. The pH ZPC of PPPC was 5.1 and the maximum values of ∆pH of PPPC are + 1.5 and-3.8 at pH 3.2 and pH 8.3. The σ of PPPC was 2.6×10-5 Ω-1 m-1. PPPC contains several active groups (NH 2 , Cl, OH, C=O, C=C, and CO -C) which classified as an effective sorbent for the solid-phase extraction (SPE) of Pb(II) ions from wastewater. The removing rate of the Pb(II) ions onto PPPC was very fast with half-life time (t 1/2) 1.13 min at pH range 3-7. The value of ∆Η for the sorption Pb(II) ions were-22.9 kJ/mol; these revealed that the values the extraction process is exothermic in nature. The recovery percentage of Pb(II) ions are 99-105% with relative standard deviation (RSD) 2.49% (n = 7).

Chemical recycling of polyurethane foam waste and application for antibacterial and removal of anionic and cationic dyes

“…The PUFWs spectrum showed that the absorption peaks were appeared at 369, 337, 336, 218, and 209 nm due to π-π * transition localized on the conjugated system. The spectrum of PUF-COO@MnO 2 shows short peaks from 372 to 376 nm and higher band at 353-369 nm that may attributed to n-π * transition which indicate successful addition of MnO 2 into the PUFWs matrix (Moawed et al 2019).…”

Application of Carbon Salicylate@Alumina Nanocomposite for Removal of Organic and Inorganic Pollutants from Wastewater

“…Water is the key to life, and it is very necessary for agriculture and in the activity of every day for living organisms (Schmidt et al 2020;Kenawy et al 2022). The biggest problem is that it is not always found in sufficient quantity and the required quality (Moawed et al 2019;Torres-Badajoz et al 2022). Nevertheless, the increased use of water in modern industries makes it vulnerable to pollution.…”

Lead Assays with Smartphone Detection Using a Monolithic Rod with 4-(2-Pyridylazo) Resorcinol

“…Polyurethane foam (PUF) has gained interest for use as a sorbent for lead [ 20 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ]. Many previous works have been devoted to pretreatment for the determination of lead by atomic absorption spectrometry.…”