ABSTRACT: Waste containing
hazardous and toxic
chemical compounds into
the environment leads to water
pollution, soil and air. These chemical compounds will endanger human life and environment.
One type of
compound that may
pollute the environment is
chromium. The metal is
commonly found in
industrial waste such as from
exhaust and industrial wastewater from etal plating
company. The purpose of this research
is to utilize coconut shell charcoal and soil humus as a low-cost and
ready-made alternative material
to reduce the
concentration chromium (Cr) on
wastewater. Humus was
taken from Baturraden region and was isolated using
NaOH extraction and was
furthermore purified using
mixtures of HF(aq): HCl(aq).
Coconut shell charcoal was
produced and was mixed with the humus. Adsorption process was carried out by batch
method on variations
of charcoal: humus
composition, pH, and
contact time. Humus soil
was identified using
infrared spectrophotometry (IR).
Determination of chromium concentration
was performed using
atomic absorption spectroscopy
(AAS). The purified humus
yielded was 25.92%
(w/w), with 34.18%
moisture, and ash content
of 18.09%. The
results showed that
the variation of
composition ratio of 2:1
charcoal and humus produced the greatest
percent reduction of 18.20%, and the optimum pH for the adsorption is 9. For
the variation of contacts time, the optimum reaction time is at 180 minutes
with decreasing concentration of Pb up to 56.07%.
Keyword: Charcoal, humic
substances, adsorption, chromium
Penulis: Anung Riapanitra dan
Roy Andreas
Kode Jurnal: jpkimiadd100042
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