Recent developments in alginate-based adsorbents for removing phosphate ions from wastewater: a review

Abstract

The huge development of the industrial sector has resulted in the release of large quantities of phosphate anions which adversely affect the environment, human health, and aquatic ecosystems.

Fe(iii) and Cr(vi) ions' removal using AgNPs/GO/chitosan nanocomposite as an adsorbent for wastewater treatment

“…Water resources have become increasingly contaminated due to rapid industrialization and dumping large quantities of wastes from various sources into waterways. [1][2][3][4] The heavy metal levels in industrial effluents discharged into rivers are alarming. Heavy metals, toxic sludge, solvents, and other hazardous industrial waste are dumped into waterways at 300-400 million metric tons per year.…”

“…Among these adsorbents, natural biopolymers are polymeric organic molecules derived from renewable sources such as algae, the exoskeletons of crustaceans and shells, plants, and microbial biomass. 3 In addition, 3D porous gels from graphene composites show new properties, such as large surface areas, high compressibility, ultralow density, and great mechanical strength. 9,10 Ideal adsorbents should have the following features: (1) large accessible surface area, (2) strong interaction between active sites and heavy metals, (3) selectivity toward target heavy metal species, and (4) easy regeneration.…”

“…8 In terms of heavy metal exposure, the World Health Organization (WHO) has established a standard of no more than 0.003 ppm (Mn), 0.01 ppm Cr(VI), and 0.006 ppm Fe(III). 3,11 Cr(VI) causes carcinogenic and mutagenic effects. As a result of exposure to mercury and cadmium contamination, the human body suffers various physical and mental ailments.…”

“…Water resources have become increasingly contaminated due to rapid industrialization and dumping large quantities of wastes from various sources into waterways. 1–4…”

Recent methods in the production of activated carbon from date palm residues for the adsorption of textile dyes: A review

“…For the past two decades, researchers around the globe gave more attention to treating dyes in wastewater via adsorption processes. Due to its design flexibility, lack of treatment byproducts, ease of service, high efficacy, reusability, low cost, ease of operation, and insensitivity to biological materials in aqueous settings, the adsorption approach is the most widely used remediation method (Abd El-Monaem et al, 2022;Eltaweil et al, 2022). Among all types of adsorbents, activated carbon (AC) derived from biomass and agricultural wastes has gained popularity due to two main reasons-being economically feasible and having excellent adsorption performance.…”