Abstract
Heavy metal pollution generating from industries is a serious issue in China as it causes severe environmental pollution and health problems. Chromium is one of the common heavy metal appeared in wastewater of metal plating and processing industries and has to reduce its concentration to permissible levels before discharge by law. This study focused on removing chromium ion present in wastewater by using bioresource material loquat leaves as an adsorbent. The extent of adsorption of chromium ion was studied and found to be dependent on solution contact time with the adsorbent, particle size and dosage of the loquat leaves and chromium concentration. The result showed that the loquat leaves have a 70% efficiency in removing chromium ions. The experimental equilibrium biosorption data were analyzed by two widely used isotherms namely Langmuir, and Freundlich. The Langmuir isotherm model better fits the experimental data than the Freundlich isotherm model by high correlation coefficients R2. The maximum monolayer capacity of loquat leaves was found to be 0.0201 mg/g for Chromium ions.
Highlights
Heavy metal pollution is a serious concern in China that wastewater originated from many industries such as mining, smelting, metal processing industries (Elhafez et al, 2017; Hegazi, 2013)
It is extremely important to develop a simple, cheap, low cost effective, good bio-adsorption efficiency's bioresource to remove the chromium in the wastewater and safeguard our future generations (Ullah et al, 2019)
The effect of agitation time on the adsorption of chromium from aqueous solution was investigated at a concentration of 10 mg/L. 100mg of the biosorbent Loquat leaves was added to 25 mL of the chromium solution in a 50mL reagent bottle and agitated at 80rpm in a rotary shaker with the temperature maintained at 27±0.5oC
Summary
Heavy metal pollution is a serious concern in China that wastewater originated from many industries such as mining, smelting, metal processing industries (Elhafez et al, 2017; Hegazi, 2013). To avoid health hazards and environmental problems, these harmful heavy metals must be removed from wastewater as much as possible (Lakherwal, 2014). Various methods can achieve removals of chromium ions from wastewater consist of precipitation, membrane filtration, ion exchange and adsorption (Chand et al, 1994; Das et al, 2008; Prakash et al, 2019). These methods are almost either expensive or ineffective, so need a method to replace all of these problems and treat the wastewater appropriately (Elhafez et al, 2017; Veglio et al, 1997). It is extremely important to develop a simple, cheap, low cost effective, good bio-adsorption efficiency's bioresource to remove the chromium in the wastewater and safeguard our future generations (Ullah et al, 2019)
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