#aqueous solution

[whats-in-a-sentence]

Figure 11.7 shows the different conductivities of aqueous solutions containing HCl and CH3COOH.

"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.

[oaresearchpaper]

The removal of arsenic,a widely occurring natural poisonous metalloid, from water employing biological sorbents having low cost and higher sorption capacity has become an important field of research as arsenic is significantly endangering human health by contaminating drinking water. Filamentous fungi have gained important place as a bio-remedial due to their fine pores, large surface area and metal sorption capacity. In present study, arsenic (As-III) tolerance of 18 indigenous filamentous fungi was explored by exposing them to As concentrations of 50 to 5600 mg kg-1.Out of 18 isolates, 12 belonged to genus Aspergillus, 3 to Fusarium, 2 to Curvularea and one to Penicillium. The fungal isolates (G-2, M-4, I-5) identified as Aspergillus fumigatus and (G-5) as Fusarium oxysporum showed highest As (III) tolerance. The fungal biomasses of highly tolerant fungi, untreated and treated with NaOH and FeCl3, ware then assessed for their arsenic removal capacity from aqueous solutions. The fresh wet biomass of natural and treated fungus was equilibrated with aqueous solutions of varying As (III) concentrations (0-1000 mg L-1).. The maximum As (III) (3.2 mg g-1) was removed by FeCl3-treated Aspergillus fumigatus (G-2) biomass followed by NaOH-treated (2.83 mg g-1) and untreated biomass (2.66 mg g-1). Maximum increase in As (III) removal (33.65 % over untreated) was observed in FeCl3-treatmentedfungal biomass over untreated whereas NaOH treatment enhanced 22.27 %. Arsenic sorption parameters i.e. maximum sorption capacity and binding strength of fungal biomasses were calculated using Langmuir and Freundlic hsorption models. Langmuir regression coefficient (r2) (0.97-0.99) indicated its better fitness to adsorption data than Freundlich model with r2 values (0.85-0.93).The tested arsenic tolerant fungal strains removed significant amounts of arsenic from arsenic enriched media in laboratory conditions and may be used as an effective sorbent in arsenic removal technology from arsenic contaminated waters.

[tenth-sentence]

In aqueous solutions with oH > 5.7, Be(OH)+ would be more important than Be(H2O)²+ while the MgOH+ and CaOH+ species only occur at very high pH.

"Environmental Chemistry: A Global Perspective", 4e - Gary W. VanLoon & Stephen J. Duffy

[tenth-sentence]

Aqueous solutions in which [H3O+] > [OH-] are termed acidic, while basic (or alkaline) solutions have [H3O+] < [OH-].

"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.

[bookpiofficial]

Biosorption of Cd (II) and As (III) Ions from Aqueous Solution by Tea Waste Biomass | Chapter 07 | Current Perspectives to Environment and Climate Change Vol. 3

Biosorption of Cadmium (Cd (II)) and Arsenic (As (III)) ions from aqueous solution by tea waste biomass was examined in a batch experimental setup. The effects of pH and temperature on the biosorption were studied in this work. The optimum pH values for the maximum efficiency of biosorption of Cd (II) and As (III) ions were found to be 5.5 and 7.5, respectively. The adsorption process was endothermic in nature and spontaneous. Further, about 95% and 84.5% removal of Cd (II) and As (III) ions was obtained at 200 mg/l of adsorbate and 6 g/l and 7 g/l of adsorbent dosage, respectively. The present study showed that tea waste biomass can serve as a good and cheap substitute for conventional carbon based adsorbents for removal of metal ions from industrial wastewater.

Author(s) Details

Dr. Suantak Kamsonlian Department of Chemical Engineering, Motilal Nehru National Institute of Technology Allahabad, Prayagraj – 211004, India.

Dr. Chandrajit Balomajumder Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee – 247667, India.

Dr. Shri Chand Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee – 247667, India.

Dr. S. Suresh Department of Chemical Engineering, Maulana Azad National Institute of Technology Bhopal, Bhopal – 462051, India.

View Book : http://bp.bookpi.org/index.php/bpi/catalog/book/131

[ijtsrd]

Adsorption of Heavy Metal Ions from Aqueous Solutions and Wastewater using Water Hyacinth Powder

by J. M. Mwaniki | J. O. Onyatta | A. O. Yusuf "Adsorption of Heavy Metal Ions from Aqueous Solutions and Wastewater using Water Hyacinth Powder" 

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-1 , December 2019, 

URL: https://www.ijtsrd.com/papers/ijtsrd29419.pdf  

Paper URL: https://www.ijtsrd.com/chemistry/environmental-chemistry/29419/adsorption-of-heavy-metal-ions-from-aqueous-solutions-and-wastewater-using-water-hyacinth-powder/j-m-mwaniki

economics journal, special issue publication, best international journal

The adsorption of heavy metals on water hyacinth powder from both wastewater and aqueous solution was studied using batch experiments. The adsorption efficiency of water hyacinth powder was evaluated in this study. The levels of heavy metals in wastewater were in the range of 1.2 75.3 ppm for lead, 0.4 87.6 ppm for chromium, 0.1 63.5 ppm for nickel, 0.5 95.5 ppm for zinc and 0.8 52.7 ppm for cadmium. The levels of zinc, lead and cadmium were above the limits set by the write NEMA in full then bracket NEMA for discharge into the environment 0.01 ppm for cadmium and lead, 0.5 ppm for zinc . The adsorption efficiency of hyacinth powder was higher in aqueous solution than in wastewater while at low metal concentrations 0.1 3.2 ppm , the adsorption efficiency of water hyacinth powder was 100 in both wastewater and aqueous solution. The study showed that water hyacinth powder is a low cost adsorbent which could be used to remove heavy metals from wastewater and aqueous solution.