Ultrasound-assisted efficient and convenient method of extracting valuable metals (Ni, Co, and Cd) from waste Ni-Cd batteries using DL-malic acid.

Recycling waste Ni-Cd batteries has received much attention recently because of the serious environmental pollution they cause and to avoid the dissipation of valuable metals. Despite significant research, it is still difficult to efficiently recycle valuable and hazardous metals from waste Ni-Cd batteries in an economical and environmentally friendly manner. This study employed a novel process utilizing ultrasound-assisted leaching to recover Ni, Cd, and Co from waste nickel-cadmium (Ni-Cd) batteries.

Recycling of NCM cathode material from spent lithium-ion batteries via polyvinyl chloride and chlorinated polyvinyl chloride in subcritical water: A comparative study.

To date, numerous studies have explored recycling of lithium, nickel, cobalt, and manganese (NCM) from spent lithium-ion batteries (LIBs). Nevertheless, the leaching and efficient separation of the precious metals from NCM active cathode material via an environmentally benign and economical process is still challenging. Therefore, in this research, we present a novel and energy an efficient route through which to leach valuable metals, for example, lithium (Li), nickel (Ni), cobalt (Co), and manganese (Mn) from the NCM cathode material of the waste LIBs using water-containing waste chlorinated polyvinyl chloride (CPVC) or polyvinyl chloride (PVC) in a batch reactor.

Rapid leaching and recovery of valuable metals from spent Lithium Ion batteries (LIBs) via environmentally benign subcritical nickel-containing water over chlorinated polyvinyl chloride.

This study presents the development of an effective and environmentally friendly method to leach and to recover valuable metals, such as lithium (Li) and cobalt (Co) from the spent lithium-ion batteries (LIBs) using subcritical water assisted by nickel catalyst and waste chlorinated polyvinyl chloride (CPVC). The effects of reaction parameters, such as Ni concentration, temperature, time, and liquid-solid ratio on the leaching efficiencies of Li and Co were carefully investigated. The solid residues obtained thereof were characterized by XRD and SEM-EDS analyses, while the leachates were analyzed by ICP-OES.

Chlorinated polyvinyl chloride (CPVC) assisted leaching of lithium and cobalt from spent lithium-ion battery in subcritical water.

The objective of this study was to determine leaching efficiency of Li and Co from spent lithium-ion batteries (LIBs) by using waste chlorinated polyvinyl chloride (CPVC) in hydrothermal subcritical water process. Waste CPVC was used as the source of HCl to speed up leaching efficiency. Effects of temperature, time, LiCoO: CPVC mass ratio and liquid-solid ratio on leaching efficiencies of Li and Co were investigated.

Assessment of Polycyclic Aromatic Hydrocarbons in School Playground Soils in Urban Gwangju, South Korea.

Soil samples from school playground of Gwangju City were analyzed for 16 polycyclic aromatic hydrocarbons (PAHs), and the soil contamination status and the potential cancer risk for students and adults were investigated. Soil samples were collected from 57 sites from 5 districts of Gwangju City in the summer of 2013. Regardless of the sampling site, the ∑PAHs concentrations ranged from 13.

Remediation approach for organic compounds and arsenic co-contaminated soil using the pressurized hot water extraction process.

Successful remediation of soil with co-existing organics contaminants and arsenic (As) is a challenge as the chemical and remediation technologies are different for each group of pollutants. In this study, the treatment effectiveness of the pressurized hot water (PHW) extraction process was investigated for remediation of soil co-contaminated with phenol, crude oil, polycyclic aromatic hydrocarbons (PAHs), and As. An elimination percentage of about 99% was achieved for phenol, and in the range of 63-100% was observed for the PAHs at 260°C for 90 min operation.

Heavy metal stabilization in contaminated soil by treatment with calcined cockle shell.

In several previous studies, the efficacy of various liming waste materials on the immobilization of heavy metals has been tested and it was found that soils contaminated with heavy metals can be stabilized using this technique. Since lime (CaO) has been identified as the main phase of calcined cockle shell (CCS), it was hypothesized that CCS could be used as a soil amendment to immobilize heavy metals in soil. However, to date, no studies have been conducted using CCS.

TNT and RDX degradation and extraction from contaminated soil using subcritical water.

The use of explosives either for industrial or military operations have resulted in the environmental pollution, poses ecological and health hazard. In this work, a subcritical water extraction (SCWE) process at laboratory scale was used at varying water temperature (100-175 °C) and flow rate (0.5-1.