Phosphorylated cellulose paper as highly efficient adsorbent for cadmium heavy metal ion removal in aqueous solutions

In search for more effective and eco-friendly adsorbent materials, this study comprehensively investigated Cd2+ adsorption onto phosphorylated cellulose paper (PCP).

Kinetic study of Heavy Metal ion removal through Hydrogels

The crosslinkers allyl mannitol (AM), allyl sorbitol (AS) and allyl pentaerythritol (AP) have been used for the synthesis of crosslinked polymeric gels of acrylic acid. These gels were used for the removal of heavy metal ions from water. The quantitative removal of metal ions was determined with the support of UV-visible absorption spectroscopy. The results show that the fully dried hydrogel samples have better adsorption potential for heavy metal ion removal. The kinetics of metal ion adsorption during the treatment of wastewater has also been studied. It was found that under certain conditions, the kinetics involved may be of pseudo first order while under different set of conditions, the kinetics involved is of pseudo second order.

Introduction and Background - About Water: Novel Water Technologies in the New Millennium

A year ago, May 24, 2019 was the 500th anniversary of the death of Leonardo da Vinci. Visionary water projects on a grand scale were one of his lifelong passions. They were never fulfilled. Substantia offers this volume on new water technologies that work, in celebration of the life of da Vinci, the artist and genius of Florence. These technologies are simple and cheap. They embrace desalination, sterilization of wastewater, including killing of viruses, selective heavy metal ion removal and harvesting. And a simple solution to a major world economic problem. that of cavitation in ship propellers. Our claims are startling and apply to real world conditions, that is, in concentrated and complex environments. They are not restricted to ideal, dilute solutions. They are presently inexplicable within the confines and boundaries of classical physical and colloid chemistry. It has been increasingly apparent that this venerable enabling discipline that underpins chemical engineering and biology suffers from sins of omission and commission. Once those strictures are removed whole new opportunities open up. Examples of these we want to exhibit here.

Selective Removal of Toxic Ions from Water/Wastewater: Using a Novel Surfactant

Pollution of drinking water by toxic heavy-metal ions is a matter of concern worldwide. These ions occur naturally, and also from environmental spills, radioactive wastes and other industrial waste. Arsenic and lead are typical examples. A novel green surfactant, purpose designed, and environmentally friendly is shown to be extremely effective and specific for heavy metal ion removal. This is a considerable step forward on previous technologies. Surfactants have been used universally to remove organic and inorganic contaminants from water. But little selectivity has been achieved. After usage, the residual surfactants are discharged into surface waters or sewage systems. This causes environmental pollution. In this review, three surfactants from different classes (novel green surfactant, synthetic chemical surfactant and biosurfactant) are compared in terms of their efficiency in flotation, removal of different heavy-metal ions, biodegradability, and toxicity level, including their advantages and disadvantages.

Industrial Wastewater: Health Concern and Treatment Strategies

Water is a basic need for the functioning of all life forms that exist on earth. However, current water resources are being polluted by anthropogenic sources, which include social unit, as well as agricultural and industrial waste. People all over the world have concerns about the impact of effluent pollution on the atmosphere, which is increasing day by day. It is hard to purify wastewater before it flows into water reservoirs. Hence, the treatment of wastewater remains an essential need before it is allowed to enter natural water streams. Wastewater treatment is relatively a modern practice. This review will particularly discuss the ways of heavy metal ion removal from wastewater. The ultimate purpose of wastewater management is to improve the health of human and environmental aspects.