This study reviews the use of agricultural and agro-processing industry wastes as metal adsorbents from wastewater. Modified materials displayed better adsorption capacity and capability of some was comparable with that of commercial activated carbons and synthetic resins. Agricultural wastes are low-cost adsorbents and can be viable alternatives to activated carbon for treatment of metal-conta...

Abstract The potential to remove Phenanthrene (PHE) from water matrices through adsorption onto natural organic substances (NOSs) and inorganic compounds (NICs) was studied. Coffee waste (CW) activated carbon (AC) produced CW, chemically pre-treated with NaOH or H 3 PO 4 were chosen as NOS, diatomaceous earth (DE) DE NIC. Comparative analysis showed that the AC CW pyrolyzed at 800 °C (CWAC-NaOH...

Four low-cost iron-bearing geo-adsorbents were tested for As(V) removal without pretreatment: Montanit300® (M), diatomite (D), pumice (P) and black sand (BS). The solids carefully characterized by different analytical techniques (SEM-EDX, TPD-pyridine, N2 Physisorption, XRD point of zero charge). adsorption was evaluated through isotherms kinetic studies (bottled water matrix, pH0=8,25 g/L soli...

Arsenic's history in science, medicine and technology has been overshadowed by its notoriety as a poison in homicides. Arsenic is viewed as being synonymous with toxicity. Dangerous arsenic concentrations in natural waters is now a worldwide problem and often referred to as a 20th-21st century calamity. High arsenic concentrations have been reported recently from the USA, China, Chile, Banglade...

Chromium, especially the hexavalent form, is toxic to humans. Industries like chrome plating, textile, electroplating discharge Cr(VI) in their effiuents. Wastes containing chromium are environmentally persistent and toxic, and cannot be degraded or detoxified biologically. Various techniques developed for the removal of heavy metals include chemical precipitation, ion exchange and adsorption. ...

This paper presents the feasibility of the removal of asphaltenes from aqueous solutions by using low- cost natural adsorbents such as light expanded clay aggregate (LECA), perlite and bentonite. The structure of adsorbents was characterized by XRD, FTIR, and SEM before and after the adsorption of asphaltenes. The effect of the adsorbent type, initial asphaltene concentration, particle size of ...