Abstract
This study focuses on the potential transforming sunflower husk wastes into innovative green products to be used for the recultivation of contaminated soils. This transformation makes it possible to utilize the large quantity plant breeding by-products to obtain a highly porous biosorbent. Optimal conditions for the preparation of bisorbents can be determined based on measurements of their specific surface and porosity. It is shown that structural characteristics of sorbent depend on conditions of the pyrolysis of primary raw material. Optimal conditions for obtaining biosorbent with a specified proportion of mesoand micropores and high specific surface are performed under three-stage pyrolysis as given by following conditions: sample holding time of 10-30 min, final temperature 700°С, and heating rate 15°С/min. A 3-month incubation study was conducted to investigate its performance in stabilization of copper contamination in Fluvisol. The sequential extraction procedure showed that the 1% sunflower husks biosorbent treatment reduced the mobile pool (exchange and carbon-bonded fractions) of Cu from 8 to 4%, respectively, compared to the contaminated soil. Cu is found to be tightly bonded owing to the increase of the residual and organic matter-bonded metal fractions. Owing to its adsorptive properties, biosorbent amendment of coppercontaminated soils appears as a promising approach to reduce the pollutant mobility and bioavailability.
Highlights
At present, huge amounts of renewable plant-related wastes and reworking products of carbon-containing raw material are produced every year in the world [1]
It is interesting to note that huge amounts of wastes are accumulated currently in each region based on the cultivation and production of organic feedstock
Pyrolysis exerted a significant influence on the structure and properties of the obtained biosorbents
Summary
Huge amounts of renewable plant-related wastes and reworking products of carbon-containing raw material are produced every year in the world [1]. Vast (tonnage-scale) source of wastes leftover after the reworking of sunflower husk are available in the Rostov region (southern European part of Russia). On the average, their accumulation rate is as much as 300 thou ton/year, and this value is growing each year due to intensification of the production of oilseeds. Their accumulation rate is as much as 300 thou ton/year, and this value is growing each year due to intensification of the production of oilseeds This huge potential, is not fully exploited (not more than 25–30%) because due to a lack of economic and efficient waste utilization technologies. Some part of the waste is used for the production of fuel briquettes, but a major part is dumped, resulting in economic inefficiency and ecological hazards [4]
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