Organic fertilizers of La, Nd, and Pr with tartaric acid ligands have been successfully synthesized. The efficiency of the complexing reaction was over 80%. The molecular formula of the complex was Ln2(C4H4O6)3.nH2O (Ln: La, Nd, Pr). The synthesized complexes were tested for the ability to stimulate growth and improve productivity for Thai cucumber. The study results showed that the complexes reduced the growth time of the plants and increased the yield by 20%. Yields of cucumbers sprayed with rare earth tartrate complexes reached ~62 tons/ha and increased by 20% compared with control samples.

Oyster shells are considered as a byproduct or solid waste in mariculture or related food processing areas that face a major disposal problem at the landfill in coastal regions for sustainable development. Oyster shell is composed mostly of CaCO3, and it is also considered as a secondary source of calcium for various applications. In this paper, we extracted the calcium carbonate from oyster shell and used it as the source of calcium for the preparation of feed-grade monocalcium phosphate (MCP). The investigation shows that the heavy metal contents in oyster shells as well as in the synthesized MCP are extremely low, and the synthesized product meets the requirements for the European Union (EU) maximum limits applied for feed additives. The XRD, TG, and IR data analyses confirmed that the synthesized product is monocalcium phosphate.

This paper researched the use of ash from domestic waste incinerators to generate electricity and blast furnace slag for civil construction materials. Due to the presence of heavy metal elements in the ash from the domestic waste incinerator and the blast furnace slag, its use is limited. This study focused on the field of manufacturing adhesive materials based on the ash from the incinerator for power generation and blast furnace slag by activated alkaline solution and investigating the heavy metal migration into the environment. The study showed that the compressive strength of the adhesive from the ash of the electric generating incinerator - blast furnace slag (BFS) activated by alkaline solution had a compressive strength 19.98 MPa when cured at normal conditions. Ash from domestic waste incinerator (DWS) - BFS binder activated alkaline had the ability to fix heavy metals and can be used in construction works.

In this study, photocatalysis was applied to degrade methyl orange (MO) and methylene blue (MB) pollutants using nanoparticles (i.e., Fe2O3, Mn2O3, Fe2O3 – Mn2O3). The results were shown that MB was relatively easier to decompose than MO. At the same initial concentration of 10 ppm, all nanomaterials need 120 min to degrade MB from 74.4%-96.5%, while after 180 min, MO is only degraded by 50%-95%. For both pollutants, the mixed nano-oxides of Fe2O3-Mn2O3 presented a superior treatment efficiency compared to the two single oxides (i.e., Fe2O3 and Mn2O3). The degradation efficiency was recorded with the order Fe2O3-Mn2O3 Fe2O3 Mn2O3. During photodecomposition, formed intermediates due to the incomplete reaction of pollutions and hydroxyl radical were investigated using the ions trap technique.

Corundum (α-alumina) is widely used and studied as high temperature structural material, electronic packaging, corrosion resistance ceramics and translucent ceramics. The production of high purity alumina play an important role. This paper presents the results of studying the effect of grinding time on the cleaning process of Tan Rai aluminum hydroxide with acetic acid, the aluminum hydroxide dissolution efficiency by HCl solution. At the same time, the results of research on the properties of aluminum oxide made from aluminum hydroxide are presented after refining in a suitable conditions.