As(V) removal using a magnetic layered double hydroxide composite

Application of Mn-Fe Layered Double Hydroxide as an Adsorbent for the Removal of Arsenic from Synthetic Acid Mine Drainage

“…The arsenic adsorption on LDHs is a fast process, as reported in some previous studies by some researchers. The equilibrium time of the arsenic removal process by LDHs was around 30 hours and 2 hours written by Otgonjargal et al (2012) and Suvokhiaw et al (2016). However, contact time of 240 minutes (4 hours) was chosen for the further experiment to make sure that the system was already in equilibrium condition.…”

“…The continuous use and consumption of polluted water due to AMD's impact causes these metals to be directly absorbed on the skin and accumulate in the body so that it can cause various health problems such as skin diseases, indigestion, and even the worstcase cause paralysis. In the AMD containing-As, As found as the inorganic oxyanions forms As (III) and As (V), whereas: As (III) is more harmful than As (V), and its removal is more complicated (Liu et al, 2019, Otgonjargal et al, 2012, Suvokhiaw et al, 2016.…”

“…As (V) can be easily eliminated by adsorption technology using adsorbents, but it is difficult to remove As (III) by adsorption processes, and therefore, As (III) requires oxidation before adsorption (Liu et al, 2019, Mohan and Pittman, 2007, Otgonjargal et al, 2012, Suvokhiaw et al, 2016. There are many methods of removing As (V); among them, the adsorption method is regarded as high efficiency, relatively costeffective technology, and minimum generation of toxic sludge for water treatment (Barrera et al, 2017, Liu et al, 2019, Núñez-Gómez et al, 2019, Otgonjargal et al, 2012, Suvokhiaw et al, 2016, Zhou et al, 2018. Various adsorbents have been developed in previous studies, such as clay minerals, activated alumina, activated carbon, and ion exchange resin.…”

Fe3O4/ZnMg(Al)O magnetic nanoparticles for efficient biodiesel production

“…Layered double hydroxides (LDHs) have been used as heterogeneous base catalysts as they exhibited a considerable large basic surface after calcination, and thus exhibited higher catalytic activity in transesterification . However, the separation and recovery of hydrotalcites from the reaction products are still difficult, which greatly affects its application in transesterification, demand for its modification and functionalization of increasingly urgent. Recently, intense research interests have focused on accommodation of magnetic nanocrystallites into LDHs matrix …”

Arsenic removal from water/wastewater using layered double hydroxide derived adsorbents, a critical review

“…Although both the xed-bed poly(Mg-Al) and poly(Mg-Fe) beads showed decent removal of the problematic As(V), the results showed that the xed-bed column of poly(Mg-Al) displayed better column performance than that of poly(Mg-Fe), and had longer operation times, treated larger volumes and removed higher quantities of As(V). Following this, Suvokhiaw et al 32 prepared magnetic Mg-Fe-Zr LDH/Fe 3 O 4 hybrids as adsorbents for As(V) removal. The As(V) adsorption ability of the pure Mg-Fe-Zr LDH (LDH), bare Fe 3 O 4 , and the Mg-Fe-Zr LDH/Fe 3 O 4 hybrid (m-LDH) and their calcined counterparts were compared.…”