Bromate removal by Fe(ii)–akaganeite (β-FeOOH) modified red mud granule material

Abstract

A multifunction red mud granule material was prepared and modified by Fe(ii)–akaganeite (β-FeOOH), which was applied to remove bromate from aqueous solution.

Remarkably efficient removal of toxic bromate from drinking water with a porphyrin–viologen covalent organic framework

“…This is an important but largely understudied area in drinking water research. 9 Among the reported post-treatment methods (physico-chemical, electrochemical or light-triggered reduction, bio-reduction, and various forms of dialysis), 10 adsorption is the most scalable and cost-effective method whereby activated carbons [11][12][13] and inorganic substances 6,14 have predominantly been used as BrO 3 À sorbents. Yet, these materials suffer from low efficiency, limited and cost-ineffective regeneration ability, and slow kinetics.…”

Fe(ii) and Mn(ii) removal by Ca(ii)–manganite (γ-MnOOH)-modified red mud granules in water

“…2-2 that the absence of the characteristic peak of Ca 2+ may be due to the insufficient loading or high dispersibility of Ca 2+ on RMG. 27 3.1.3 SEM. The morphology of the ceramic lter material was studied using SEM images.…”

“…In contrast, the zeta potential of the sintered RMG material was negative when pH > 3.3, which would have a positive effect during the adsorption process of cation. 27 The zeta potential of RMG was À10.97 mV, indicating that RMG had a negative charge under the condition of pH ¼ 7, which played an active role in the process of removing Fe 2+ and Mn 2+ . The surface potential obtained aer loading showed negative when the pH value was weak alkali, which could increase the adsorption of cationic particles through electrostatic attraction.…”

“…A certain amount of the abovementioned mixture powder and polyvinyl alcohol were mixed and stirred at 70 C until they were muddy and attained a shape like a sieve ball, which was about 1 mm in size. 27 Aer drying, the spherical particles were placed in a muffle furnace, calcined at 1030 C and then acquired.…”

The potential for the use of waste products from a variety of sectors in water treatment processes

“…Gaps exist in the adsorption potential of NH 4 + -N and DOC, although Lopez et al (1998) observed NH 4 + -N removal from secondary effluent from a wastewater treatment plant. Bayer residue can also achieve more than 90% bromate removal from aqueous solutions (Chen et al, 2016). The positive results indicate that further research should be carried out to assess the removal capabilities of a spectrum of contaminants.…”