[ABSTRAK
Limbah yang mengandung logam berat timbal (Pb) sangat berbahaya bagilingkungan. Selama ini beberapa proses pengolahan telah diperkenalkan untukmengolah limbah, dari proses pengendapan, hingga menggunakan resin penukarion. Daun ketapang telah di gunakan sebagai media pengolahan air yangdigunakan untuk akuarium. Para peneliti telah menunjukkan daun ketapangberpotensi sebagai pengolah air limbah. Penelitian ini bertujuan untuk mengetahuipotensi biosorpsi daun ketapang pada limbah yang tercemar logam berbahaya,dengan mempelajari karakteristik biosorpsi, kesetimbangan, kinetika dantermodinamika. Kondisi optimum seperti pH, dosis daun ketapang, waktu kontakdan suhu akan di amati pada penelitian ini. Hasil Penelitian Biomassa daunketapang berpotensi sebagai biosorben, dengan perlakuan asam atau basa, daunketapang ini masih memberikan % adsorpsi yang kompetitif dengan daunketapang yang diperlakukan asam. Penyerapan sangat dipengaruhi oleh pH ,konsentrasi ion Pb, massa adsorben, waktu kontak dan suhu, yang berurutan nilaimaksimum nya adalah pH 3, konsentrasi ion Pb 5 mg/L, massa adsorben 0,5gram, waktu kontak 4 jam, dan suhu 40 oC. Laju reaksi berjalan pada orde satudan memenuhi kaidah isotermal Freundlich serta Langmuir. Daun ketapangdengan perlakuan diasamkan memiliki keunggulan dibandingkan daengan daunketapang murni dan daun ketapang dibasakan.

---

ABSTRACT
Waste containing of lead (Pb) is very dangerous for environment. However,waste treatment process has been introduced to minimize the waste, either byprecipitation process or ionic exchange resin. In addition, researchers have shownthat ketapang leaves (Terminalia Catappa) can be potentially used in waste watertreatment. It has been used as water treatment media for fresh water aquarium.Moreover, this research is aimed to find out the potential of ketapang leavesbiosorption for waste that has been polluted by dangerous metal, such as lead, byinvestigating the characteristics of biosorption, balance, kinetics andthermodynamics. Maximum conditions of pH, ketapang leaves dose, contact time,and temperature were also investigated in this research. The result shows thatbiomass of ketapang leaves is potential to be biosorbent, and with regard to acidor base reaction it still has potential to be biosorbent. Nevertheless, the absorbtionis really dependent to pH, Pb concentration, adsorbent mass, contact time, andtemperature, in which the maximum limits are 3; 5 mg/L; 0.5 gram; 4 hours;400C; respectively. Reaction rate, moreover, was running on first order and wasfulfilled the principle of Freundlich as well as Langmuir. Ketapang leaves withacidified treatment has advantages over the pure ketapang leaves and leafketapang basified.;Waste containing of lead (Pb) is very dangerous for environment. However,waste treatment process has been introduced to minimize the waste, either byprecipitation process or ionic exchange resin. In addition, researchers have shownthat ketapang leaves (Terminalia Catappa) can be potentially used in waste watertreatment. It has been used as water treatment media for fresh water aquarium.Moreover, this research is aimed to find out the potential of ketapang leavesbiosorption for waste that has been polluted by dangerous metal, such as lead, byinvestigating the characteristics of biosorption, balance, kinetics andthermodynamics. Maximum conditions of pH, ketapang leaves dose, contact time,and temperature were also investigated in this research. The result shows thatbiomass of ketapang leaves is potential to be biosorbent, and with regard to acidor base reaction it still has potential to be biosorbent. Nevertheless, the absorbtionis really dependent to pH, Pb concentration, adsorbent mass, contact time, andtemperature, in which the maximum limits are 3; 5 mg/L; 0.5 gram; 4 hours;400C; respectively. Reaction rate, moreover, was running on first order and wasfulfilled the principle of Freundlich as well as Langmuir. Ketapang leaves withacidified treatment has advantages over the pure ketapang leaves and leafketapang basified., Waste containing of lead (Pb) is very dangerous for environment. However,waste treatment process has been introduced to minimize the waste, either byprecipitation process or ionic exchange resin. In addition, researchers have shownthat ketapang leaves (Terminalia Catappa) can be potentially used in waste watertreatment. It has been used as water treatment media for fresh water aquarium.Moreover, this research is aimed to find out the potential of ketapang leavesbiosorption for waste that has been polluted by dangerous metal, such as lead, byinvestigating the characteristics of biosorption, balance, kinetics andthermodynamics. Maximum conditions of pH, ketapang leaves dose, contact time,and temperature were also investigated in this research. The result shows thatbiomass of ketapang leaves is potential to be biosorbent, and with regard to acidor base reaction it still has potential to be biosorbent. Nevertheless, the absorbtionis really dependent to pH, Pb concentration, adsorbent mass, contact time, andtemperature, in which the maximum limits are 3; 5 mg/L; 0.5 gram; 4 hours;400C; respectively. Reaction rate, moreover, was running on first order and wasfulfilled the principle of Freundlich as well as Langmuir. Ketapang leaves withacidified treatment has advantages over the pure ketapang leaves and leafketapang basified.]