A Humins-Derived Magnetic Biochar for Water Purification by Adsorption and Magnetic Separation (original) (raw)

Magnetically modified biochar for organic xenobiotics removal

Water Science and Technology, 2016

Large amounts of biochar are produced worldwide for potential agricultural applications. However, this material can also be used as an efficient biosorbent for xenobiotics removal. In this work, biochar was magnetically modified using microwave-synthesized magnetic iron oxide particles. This new type of a magnetically responsive biocomposite material can be easily separated by means of strong permanent magnets. Magnetic biochar has been used as an inexpensive magnetic adsorbent for the removal of water-soluble dyes. Five dyes (malachite green, methyl green, Bismarck brown Y, acridine orange and Nile blue A) were used to study the adsorption process. The dyes adsorption could be usually described with the Langmuir isotherm. The maximum adsorption capacities reached the value 137 mg of dye per g of dried magnetically modified biochar for Bismarck brown Y. The adsorption processes followed the pseudo-second-order kinetic model and the thermodynamic studies indicated spontaneous and end...

Heavy metal removal from aqueous solutions using engineered magnetic biochars derived from waste marine macro-algal biomass

The Science of the total environment, 2017

Despite the excellent sorption ability of biochar for heavy metals, it is difficult to separate and reuse after adsorption when applied to wastewater treatment process. To overcome these drawbacks, we developed an engineered magnetic biochar by pyrolyzing waste marine macro-algae as a feedstock, and we doped iron oxide particles (e.g., magnetite, maghemite) to impart magnetism. The physicochemical characteristics and adsorption properties of the biochar were evaluated. When compared to conventional pinewood sawdust biochar, the waste marine algae-based magnetic biochar exhibited a greater potential to remove heavy metals despite having a lower surface area (0.97m(2)/g for kelp magnetic biochar and 63.33m(2)/g for hijikia magnetic biochar). Although magnetic biochar could be effectively separated from the solution, however, the magnetization of the biochar partially reduced its heavy metal adsorption efficiency due to the biochar's surface pores becoming plugged with iron oxide p...

A Review on Magnetic Nanobiochar with Their Use in Environmental Remediation and High-Value Applications

Journal of Nanomaterials

Magnetic nanobiochar (MNBC) is a sort of nanobiochar that has been enhanced with magnetic qualities. MNBC is made from a variety of feedstocks, including wood chips, agricultural waste, municipal sludge, animal manure, and other organic waste. These feedstocks are pyrolyzed at various temperatures to produce biochar, which is then mixed with magnetic precursors to create MNBC. Crystallinity, high porosity, specific surface area, and great catalytic activity are a few of the dynamic properties of MNBC. The major purpose of this review paper is to characterize MNBC, using the various biochar synthesis methods and how bulk biochar is converted into MNBC with their high-value applications discussed here.

Agricultural waste-based magnetic biochar produced via hydrothermal route for petroleum spills adsorption

International Journal of Renewable Energy Development

Oil spills are one of the marine pollution events triggered by the results of tanker operations (air ballast), ship repairs and maintenance (docking), mid-ocean loading and unloading terminals, air bilge (drainage of water, oil, and engine-processed lubricants), ship scrapping, and the most common accidents/collisions of tankers. The impacts vary from the death of marine organisms, especially fish, changes in reproduction and behavior of organisms, plankton contamination, fish migration, as well as ecosystem damage, and economic loss. Bio-based absorbents such as biochar can be an environmentally friendly alternative to chemical sorbents that works to adsorb oil spills faster. In this study, the effectiveness of magnetic biochar in oil spill removal was investigated. It also includes the synthesisation of magnetic biochar from agricultural waste (bagasse, rice husks, and sawdust) using the hydrothermal method at a temperature of 200°C. Hydrothermal carbonization is considered a cost...

Formation and Properties of Magnetic Biochar

Magnetic biochar made from agricultural biomass waste such as SRC willow, which is a densely planted, high-yielding energy crop and one of the leading sources of renewable energy production, combined with iron (II) chloride and iron (III) chloride, is a multi-functional material for land remediation and agricultural applications. Two magnetic biochar's (1.0 M iron solution magnetic biochar and 0.1 M iron solution magnetic biochar) were prepared by the chemical mixture and co-precipitation of iron (II) chloride tetrahydrate and iron (III) chloride on SRC willow with a particle size of less than 2 mm (about 0.08 in). The mixture of SRC willow with iron (II) chloride tetrahydrate and iron (III) chloride was then dried in the oven and pyrolyzed at 400 degrees Celsius. Scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction research on the 1.0 M iron solution magnetic biochar and the 0.1 M iron solution magnetic biochar reveal a greater concentrat...